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Comparing jsr166/src/main/java/util/TreeMap.java (file contents):
Revision 1.17 by dl, Thu May 26 12:07:07 2005 UTC vs.
Revision 1.37 by dl, Tue May 9 18:17:08 2006 UTC

#	Line 1 | Line 1
1		/*
2		* %W% %E%
3		*
4	<	* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
4	>	* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
5		* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6		*/
7
#	Line 30 | Line 30 | package java.util;
30		* <i>is</i> well-defined even if its ordering is inconsistent with equals; it
31		* just fails to obey the general contract of the <tt>Map</tt> interface.
32		*
33	<	* <p><b>Note that this implementation is not synchronized.</b> If multiple
34	<	* threads access a map concurrently, and at least one of the threads modifies
35	<	* the map structurally, it <i>must</i> be synchronized externally.  (A
36	<	* structural modification is any operation that adds or deletes one or more
37	<	* mappings; merely changing the value associated with an existing key is not
38	<	* a structural modification.)  This is typically accomplished by
39	<	* synchronizing on some object that naturally encapsulates the map.  If no
40	<	* such object exists, the map should be "wrapped" using the
41	<	* <tt>Collections.synchronizedMap</tt> method.  This is best done at creation
42	<	* time, to prevent accidental unsynchronized access to the map:
43	<	* <pre>
44	<	*     Map m = Collections.synchronizedMap(new TreeMap(...));
45	<	* </pre>
33	>	* <p><strong>Note that this implementation is not synchronized.</strong>
34	>	* If multiple threads access a map concurrently, and at least one of the
35	>	* threads modifies the map structurally, it <i>must</i> be synchronized
36	>	* externally.  (A structural modification is any operation that adds or
37	>	* deletes one or more mappings; merely changing the value associated
38	>	* with an existing key is not a structural modification.)  This is
39	>	* typically accomplished by synchronizing on some object that naturally
40	>	* encapsulates the map.
41	>	* If no such object exists, the map should be "wrapped" using the
42	>	* {@link Collections#synchronizedSortedMap Collections.synchronizedSortedMap}
43	>	* method.  This is best done at creation time, to prevent accidental
44	>	* unsynchronized access to the map: <pre>
45	>	*   SortedMap m = Collections.synchronizedSortedMap(new TreeMap(...));</pre>
46		*
47		* <p>The iterators returned by the <tt>iterator</tt> method of the collections
48		* returned by all of this class's "collection view methods" are
#	Line 68 | Line 68 | package java.util;
68		* associated map using <tt>put</tt>.)
69		*
70		* <p>This class is a member of the
71	<	* <a href="{@docRoot}/../guide/collections/index.html">
71	>	* <a href="{@docRoot}/../technotes/guides/collections/index.html">
72		* Java Collections Framework</a>.
73		*
74		* @param <K> the type of keys maintained by this map
#	Line 82 | Line 82 | package java.util;
82		* @see Comparable
83		* @see Comparator
84		* @see Collection
85	–	* @see Collections#synchronizedMap(Map)
85		* @since 1.2
86		*/
87
#	Line 96 | Line 95 | public class TreeMap<K,V>
95		*
96		* @serial
97		*/
98	<	private Comparator<? super K> comparator = null;
98	>	private final Comparator<? super K> comparator;
99
100		private transient Entry<K,V> root = null;
101
#	Line 110 | Line 109 | public class TreeMap<K,V>
109		*/
110		private transient int modCount = 0;
111
113	–	private void incrementSize()   { modCount++; size++; }
114	–	private void decrementSize()   { modCount++; size--; }
115	–
112		/**
113		* Constructs a new, empty tree map, using the natural ordering of its
114		* keys.  All keys inserted into the map must implement the {@link
#	Line 126 | Line 122 | public class TreeMap<K,V>
122		* <tt>ClassCastException</tt>.
123		*/
124		public TreeMap() {
125	+	comparator = null;
126		}
127
128		/**
#	Line 161 | Line 158 | public class TreeMap<K,V>
158		* @throws NullPointerException if the specified map is null
159		*/
160		public TreeMap(Map<? extends K, ? extends V> m) {
161	+	comparator = null;
162		putAll(m);
163		}
164
#	Line 216 | Line 214 | public class TreeMap<K,V>
214		* specified value.  More formally, returns <tt>true</tt> if and only if
215		* this map contains at least one mapping to a value <tt>v</tt> such
216		* that <tt>(value==null ? v==null : value.equals(v))</tt>.  This
217	<	* operation requires time linear in the map size.
217	>	* operation will probably require time linear in the map size for
218	>	* most implementations.
219		*
220		* @param value value whose presence in this map is to be tested
221		* @return <tt>true</tt> if a mapping to <tt>value</tt> exists;
#	Line 224 | Line 223 | public class TreeMap<K,V>
223		* @since 1.2
224		*/
225		public boolean containsValue(Object value) {
226	<	return (root==null ? false :
227	<	(value==null ? valueSearchNull(root)
228	<	: valueSearchNonNull(root, value)));
229	<	}
231	<
232	<	private boolean valueSearchNull(Entry n) {
233	<	if (n.value == null)
234	<	return true;
235	<
236	<	// Check left and right subtrees for value
237	<	return (n.left  != null && valueSearchNull(n.left)) ||
238	<	(n.right != null && valueSearchNull(n.right));
239	<	}
240	<
241	<	private boolean valueSearchNonNull(Entry n, Object value) {
242	<	// Check this node for the value
243	<	if (value.equals(n.value))
244	<	return true;
245	<
246	<	// Check left and right subtrees for value
247	<	return (n.left  != null && valueSearchNonNull(n.left, value)) ||
248	<	(n.right != null && valueSearchNonNull(n.right, value));
226	>	for (Entry<K,V> e = getFirstEntry(); e != null; e = successor(e))
227	>	if (valEquals(value, e.value))
228	>	return true;
229	>	return false;
230		}
231
232		/**
233	<	* Returns the value to which this map maps the specified key, or
234	<	* <tt>null</tt> if the map contains no mapping for the key.  A return
235	<	* value of <tt>null</tt> does not <i>necessarily</i> indicate that the
236	<	* map contains no mapping for the key; it's also possible that the map
237	<	* explicitly maps the key to <tt>null</tt>.  The {@link #containsKey}
238	<	* operation may be used to distinguish these two cases.
233	>	* Returns the value to which the specified key is mapped,
234	>	* or {@code null} if this map contains no mapping for the key.
235	>	*
236	>	* <p>More formally, if this map contains a mapping from a key
237	>	* {@code k} to a value {@code v} such that {@code key} compares
238	>	* equal to {@code k} according to the map's ordering, then this
239	>	* method returns {@code v}; otherwise it returns {@code null}.
240	>	* (There can be at most one such mapping.)
241	>	*
242	>	* <p>A return value of {@code null} does not <i>necessarily</i>
243	>	* indicate that the map contains no mapping for the key; it's also
244	>	* possible that the map explicitly maps the key to {@code null}.
245	>	* The {@link #containsKey containsKey} operation may be used to
246	>	* distinguish these two cases.
247		*
259	–	* @param key key whose associated value is to be returned
260	–	* @return the value to which this map maps the specified key, or
261	–	*         <tt>null</tt> if the map contains no mapping for the key
248		* @throws ClassCastException if the specified key cannot be compared
249		*         with the keys currently in the map
250		* @throws NullPointerException if the specified key is null
#	Line 330 | Line 316 | public class TreeMap<K,V>
316		*         and this map uses natural ordering, or its comparator
317		*         does not permit null keys
318		*/
319	<	private Entry<K,V> getEntry(Object key) {
319	>	final Entry<K,V> getEntry(Object key) {
320		// Offload comparator-based version for sake of performance
321		if (comparator != null)
322		return getEntryUsingComparator(key);
323	+	if (key == null)
324	+	throw new NullPointerException();
325		Comparable<? super K> k = (Comparable<? super K>) key;
326		Entry<K,V> p = root;
327		while (p != null) {
#	Line 354 | Line 342 | public class TreeMap<K,V>
342		* that are less dependent on comparator performance, but is
343		* worthwhile here.)
344		*/
345	<	private Entry<K,V> getEntryUsingComparator(Object key) {
345	>	final Entry<K,V> getEntryUsingComparator(Object key) {
346		K k = (K) key;
347		Comparator<? super K> cpr = comparator;
348	<	Entry<K,V> p = root;
349	<	while (p != null) {
350	<	int cmp = cpr.compare(k, p.key);
351	<	if (cmp < 0)
352	<	p = p.left;
353	<	else if (cmp > 0)
354	<	p = p.right;
355	<	else
356	<	return p;
348	>	if (cpr != null) {
349	>	Entry<K,V> p = root;
350	>	while (p != null) {
351	>	int cmp = cpr.compare(k, p.key);
352	>	if (cmp < 0)
353	>	p = p.left;
354	>	else if (cmp > 0)
355	>	p = p.right;
356	>	else
357	>	return p;
358	>	}
359		}
360		return null;
361		}
#	Line 376 | Line 366 | public class TreeMap<K,V>
366		* key; if no such entry exists (i.e., the greatest key in the Tree is less
367		* than the specified key), returns <tt>null</tt>.
368		*/
369	<	private Entry<K,V> getCeilingEntry(K key) {
369	>	final Entry<K,V> getCeilingEntry(K key) {
370		Entry<K,V> p = root;
371	<	if (p==null)
382	<	return null;
383	<
384	<	while (true) {
371	>	while (p != null) {
372		int cmp = compare(key, p.key);
373		if (cmp < 0) {
374		if (p.left != null)
#	Line 403 | Line 390 | public class TreeMap<K,V>
390		} else
391		return p;
392		}
393	+	return null;
394		}
395
396		/**
#	Line 410 | Line 398 | public class TreeMap<K,V>
398		* exists, returns the entry for the greatest key less than the specified
399		* key; if no such entry exists, returns <tt>null</tt>.
400		*/
401	<	private Entry<K,V> getFloorEntry(K key) {
401	>	final Entry<K,V> getFloorEntry(K key) {
402		Entry<K,V> p = root;
403	<	if (p==null)
416	<	return null;
417	<
418	<	while (true) {
403	>	while (p != null) {
404		int cmp = compare(key, p.key);
405		if (cmp > 0) {
406		if (p.right != null)
#	Line 438 | Line 423 | public class TreeMap<K,V>
423		return p;
424
425		}
426	+	return null;
427		}
428
429		/**
#	Line 446 | Line 432 | public class TreeMap<K,V>
432		* key greater than the specified key; if no such entry exists
433		* returns <tt>null</tt>.
434		*/
435	<	private Entry<K,V> getHigherEntry(K key) {
435	>	final Entry<K,V> getHigherEntry(K key) {
436		Entry<K,V> p = root;
437	<	if (p==null)
452	<	return null;
453	<
454	<	while (true) {
437	>	while (p != null) {
438		int cmp = compare(key, p.key);
439		if (cmp < 0) {
440		if (p.left != null)
#	Line 472 | Line 455 | public class TreeMap<K,V>
455		}
456		}
457		}
458	+	return null;
459		}
460
461		/**
#	Line 479 | Line 463 | public class TreeMap<K,V>
463		* no such entry exists (i.e., the least key in the Tree is greater than
464		* the specified key), returns <tt>null</tt>.
465		*/
466	<	private Entry<K,V> getLowerEntry(K key) {
466	>	final Entry<K,V> getLowerEntry(K key) {
467		Entry<K,V> p = root;
468	<	if (p==null)
485	<	return null;
486	<
487	<	while (true) {
468	>	while (p != null) {
469		int cmp = compare(key, p.key);
470		if (cmp > 0) {
471		if (p.right != null)
#	Line 505 | Line 486 | public class TreeMap<K,V>
486		}
487		}
488		}
489	<	}
509	<
510	<	/**
511	<	* Returns the key corresponding to the specified Entry.
512	<	* @throws NoSuchElementException if the Entry is null
513	<	*/
514	<	private static <K> K key(Entry<K,?> e) {
515	<	if (e==null)
516	<	throw new NoSuchElementException();
517	<	return e.key;
489	>	return null;
490		}
491
492		/**
493		* Associates the specified value with the specified key in this map.
494	<	* If the map previously contained a mapping for this key, the old
494	>	* If the map previously contained a mapping for the key, the old
495		* value is replaced.
496		*
497		* @param key key with which the specified value is to be associated
#	Line 537 | Line 509 | public class TreeMap<K,V>
509		*/
510		public V put(K key, V value) {
511		Entry<K,V> t = root;
540	–
512		if (t == null) {
513	<	if (key == null) {
514	<	if (comparator == null)
515	<	throw new NullPointerException();
516	<	comparator.compare(key, key);
517	<	}
547	<	incrementSize();
513	>	// TBD:
514	>	// 5045147: (coll) Adding null to an empty TreeSet should
515	>	// throw NullPointerException
516	>	//
517	>	// compare(key, key); // type check
518		root = new Entry<K,V>(key, value, null);
519	+	size = 1;
520	+	modCount++;
521		return null;
522		}
523	<
524	<	while (true) {
525	<	int cmp = compare(key, t.key);
526	<	if (cmp == 0) {
527	<	return t.setValue(value);
528	<	} else if (cmp < 0) {
529	<	if (t.left != null) {
523	>	int cmp;
524	>	Entry<K,V> parent;
525	>	// split comparator and comparable paths
526	>	Comparator<? super K> cpr = comparator;
527	>	if (cpr != null) {
528	>	do {
529	>	parent = t;
530	>	cmp = cpr.compare(key, t.key);
531	>	if (cmp < 0)
532		t = t.left;
533	<	} else {
560	<	incrementSize();
561	<	t.left = new Entry<K,V>(key, value, t);
562	<	fixAfterInsertion(t.left);
563	<	return null;
564	<	}
565	<	} else { // cmp > 0
566	<	if (t.right != null) {
533	>	else if (cmp > 0)
534		t = t.right;
535	<	} else {
536	<	incrementSize();
537	<	t.right = new Entry<K,V>(key, value, t);
571	<	fixAfterInsertion(t.right);
572	<	return null;
573	<	}
574	<	}
535	>	else
536	>	return t.setValue(value);
537	>	} while (t != null);
538		}
539	+	else {
540	+	if (key == null)
541	+	throw new NullPointerException();
542	+	Comparable<? super K> k = (Comparable<? super K>) key;
543	+	do {
544	+	parent = t;
545	+	cmp = k.compareTo(t.key);
546	+	if (cmp < 0)
547	+	t = t.left;
548	+	else if (cmp > 0)
549	+	t = t.right;
550	+	else
551	+	return t.setValue(value);
552	+	} while (t != null);
553	+	}
554	+	Entry<K,V> e = new Entry<K,V>(key, value, parent);
555	+	if (cmp < 0)
556	+	parent.left = e;
557	+	else
558	+	parent.right = e;
559	+	fixAfterInsertion(e);
560	+	size++;
561	+	modCount++;
562	+	return null;
563		}
564
565		/**
#	Line 628 | Line 615 | public class TreeMap<K,V>
615		clone.size = 0;
616		clone.modCount = 0;
617		clone.entrySet = null;
618	<	clone.descendingEntrySet = null;
619	<	clone.descendingKeySet = null;
618	>	clone.navigableKeySet = null;
619	>	clone.descendingMap = null;
620
621		// Initialize clone with our mappings
622		try {
#	Line 643 | Line 630 | public class TreeMap<K,V>
630
631		// NavigableMap API methods
632
633	+	/**
634	+	* @since 1.6
635	+	*/
636		public Map.Entry<K,V> firstEntry() {
637	<	Entry<K,V> e = getFirstEntry();
648	<	return (e == null)? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
637	>	return exportEntry(getFirstEntry());
638		}
639
640	+	/**
641	+	* @since 1.6
642	+	*/
643		public Map.Entry<K,V> lastEntry() {
644	<	Entry<K,V> e = getLastEntry();
653	<	return (e == null)? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
644	>	return exportEntry(getLastEntry());
645		}
646
647	+	/**
648	+	* @since 1.6
649	+	*/
650		public Map.Entry<K,V> pollFirstEntry() {
651		Entry<K,V> p = getFirstEntry();
652	<	if (p == null)
653	<	return null;
654	<	Map.Entry<K,V> result = new AbstractMap.SimpleImmutableEntry<K,V>(p);
661	<	deleteEntry(p);
652	>	Map.Entry<K,V> result = exportEntry(p);
653	>	if (p != null)
654	>	deleteEntry(p);
655		return result;
656		}
657
658	+	/**
659	+	* @since 1.6
660	+	*/
661		public Map.Entry<K,V> pollLastEntry() {
662		Entry<K,V> p = getLastEntry();
663	<	if (p == null)
664	<	return null;
665	<	Map.Entry<K,V> result = new AbstractMap.SimpleImmutableEntry<K,V>(p);
670	<	deleteEntry(p);
663	>	Map.Entry<K,V> result = exportEntry(p);
664	>	if (p != null)
665	>	deleteEntry(p);
666		return result;
667		}
668
#	Line 676 | Line 671 | public class TreeMap<K,V>
671		* @throws NullPointerException if the specified key is null
672		*         and this map uses natural ordering, or its comparator
673		*         does not permit null keys
674	+	* @since 1.6
675		*/
676		public Map.Entry<K,V> lowerEntry(K key) {
677	<	Entry<K,V> e =  getLowerEntry(key);
682	<	return (e == null)? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
677	>	return exportEntry(getLowerEntry(key));
678		}
679
680		/**
#	Line 687 | Line 682 | public class TreeMap<K,V>
682		* @throws NullPointerException if the specified key is null
683		*         and this map uses natural ordering, or its comparator
684		*         does not permit null keys
685	+	* @since 1.6
686		*/
687		public K lowerKey(K key) {
688	<	Entry<K,V> e =  getLowerEntry(key);
693	<	return (e == null)? null : e.key;
688	>	return keyOrNull(getLowerEntry(key));
689		}
690
691		/**
#	Line 698 | Line 693 | public class TreeMap<K,V>
693		* @throws NullPointerException if the specified key is null
694		*         and this map uses natural ordering, or its comparator
695		*         does not permit null keys
696	+	* @since 1.6
697		*/
698		public Map.Entry<K,V> floorEntry(K key) {
699	<	Entry<K,V> e = getFloorEntry(key);
704	<	return (e == null)? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
699	>	return exportEntry(getFloorEntry(key));
700		}
701
702		/**
#	Line 709 | Line 704 | public class TreeMap<K,V>
704		* @throws NullPointerException if the specified key is null
705		*         and this map uses natural ordering, or its comparator
706		*         does not permit null keys
707	+	* @since 1.6
708		*/
709		public K floorKey(K key) {
710	<	Entry<K,V> e = getFloorEntry(key);
715	<	return (e == null)? null : e.key;
710	>	return keyOrNull(getFloorEntry(key));
711		}
712
713		/**
#	Line 720 | Line 715 | public class TreeMap<K,V>
715		* @throws NullPointerException if the specified key is null
716		*         and this map uses natural ordering, or its comparator
717		*         does not permit null keys
718	+	* @since 1.6
719		*/
720		public Map.Entry<K,V> ceilingEntry(K key) {
721	<	Entry<K,V> e = getCeilingEntry(key);
726	<	return (e == null)? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
721	>	return exportEntry(getCeilingEntry(key));
722		}
723
724		/**
#	Line 731 | Line 726 | public class TreeMap<K,V>
726		* @throws NullPointerException if the specified key is null
727		*         and this map uses natural ordering, or its comparator
728		*         does not permit null keys
729	+	* @since 1.6
730		*/
731		public K ceilingKey(K key) {
732	<	Entry<K,V> e = getCeilingEntry(key);
737	<	return (e == null)? null : e.key;
732	>	return keyOrNull(getCeilingEntry(key));
733		}
734
735		/**
#	Line 742 | Line 737 | public class TreeMap<K,V>
737		* @throws NullPointerException if the specified key is null
738		*         and this map uses natural ordering, or its comparator
739		*         does not permit null keys
740	+	* @since 1.6
741		*/
742		public Map.Entry<K,V> higherEntry(K key) {
743	<	Entry<K,V> e = getHigherEntry(key);
748	<	return (e == null)? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
743	>	return exportEntry(getHigherEntry(key));
744		}
745
746		/**
#	Line 753 | Line 748 | public class TreeMap<K,V>
748		* @throws NullPointerException if the specified key is null
749		*         and this map uses natural ordering, or its comparator
750		*         does not permit null keys
751	+	* @since 1.6
752		*/
753		public K higherKey(K key) {
754	<	Entry<K,V> e = getHigherEntry(key);
759	<	return (e == null)? null : e.key;
754	>	return keyOrNull(getHigherEntry(key));
755		}
756
757		// Views
#	Line 766 | Line 761 | public class TreeMap<K,V>
761		* the first time this view is requested.  Views are stateless, so
762		* there's no reason to create more than one.
763		*/
764	<	private transient Set<Map.Entry<K,V>> entrySet = null;
765	<	private transient Set<Map.Entry<K,V>> descendingEntrySet = null;
766	<	private transient Set<K> descendingKeySet = null;
764	>	private transient EntrySet entrySet = null;
765	>	private transient KeySet<K> navigableKeySet = null;
766	>	private transient NavigableMap<K,V> descendingMap = null;
767
768		/**
769		* Returns a {@link Set} view of the keys contained in this map.
#	Line 785 | Line 780 | public class TreeMap<K,V>
780		* operations.
781		*/
782		public Set<K> keySet() {
783	<	Set<K> ks = keySet;
789	<	return (ks != null) ? ks : (keySet = new KeySet());
783	>	return navigableKeySet();
784		}
785
786	<	class KeySet extends AbstractSet<K> {
787	<	public Iterator<K> iterator() {
788	<	return new KeyIterator(getFirstEntry());
789	<	}
790	<
791	<	public int size() {
792	<	return TreeMap.this.size();
799	<	}
800	<
801	<	public boolean contains(Object o) {
802	<	return containsKey(o);
803	<	}
804	<
805	<	public boolean remove(Object o) {
806	<	int oldSize = size;
807	<	TreeMap.this.remove(o);
808	<	return size != oldSize;
809	<	}
786	>	/**
787	>	* @since 1.6
788	>	*/
789	>	public NavigableSet<K> navigableKeySet() {
790	>	KeySet<K> nks = navigableKeySet;
791	>	return (nks != null) ? nks : (navigableKeySet = new KeySet(this));
792	>	}
793
794	<	public void clear() {
795	<	TreeMap.this.clear();
796	<	}
794	>	/**
795	>	* @since 1.6
796	>	*/
797	>	public NavigableSet<K> descendingKeySet() {
798	>	return descendingMap().navigableKeySet();
799		}
800
801		/**
#	Line 833 | Line 818 | public class TreeMap<K,V>
818		return (vs != null) ? vs : (values = new Values());
819		}
820
821	+	/**
822	+	* Returns a {@link Set} view of the mappings contained in this map.
823	+	* The set's iterator returns the entries in ascending key order.
824	+	* The set is backed by the map, so changes to the map are
825	+	* reflected in the set, and vice-versa.  If the map is modified
826	+	* while an iteration over the set is in progress (except through
827	+	* the iterator's own <tt>remove</tt> operation, or through the
828	+	* <tt>setValue</tt> operation on a map entry returned by the
829	+	* iterator) the results of the iteration are undefined.  The set
830	+	* supports element removal, which removes the corresponding
831	+	* mapping from the map, via the <tt>Iterator.remove</tt>,
832	+	* <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt> and
833	+	* <tt>clear</tt> operations.  It does not support the
834	+	* <tt>add</tt> or <tt>addAll</tt> operations.
835	+	*/
836	+	public Set<Map.Entry<K,V>> entrySet() {
837	+	EntrySet es = entrySet;
838	+	return (es != null) ? es : (entrySet = new EntrySet());
839	+	}
840	+
841	+	/**
842	+	* @since 1.6
843	+	*/
844	+	public NavigableMap<K, V> descendingMap() {
845	+	NavigableMap<K, V> km = descendingMap;
846	+	return (km != null) ? km :
847	+	(descendingMap = new DescendingSubMap(this,
848	+	true, null, true,
849	+	true, null, true));
850	+	}
851	+
852	+	/**
853	+	* @throws ClassCastException       {@inheritDoc}
854	+	* @throws NullPointerException if <tt>fromKey</tt> or <tt>toKey</tt> is
855	+	*         null and this map uses natural ordering, or its comparator
856	+	*         does not permit null keys
857	+	* @throws IllegalArgumentException {@inheritDoc}
858	+	* @since 1.6
859	+	*/
860	+	public NavigableMap<K,V> subMap(K fromKey, boolean fromInclusive,
861	+	K toKey,   boolean toInclusive) {
862	+	return new AscendingSubMap(this,
863	+	false, fromKey, fromInclusive,
864	+	false, toKey,   toInclusive);
865	+	}
866	+
867	+	/**
868	+	* @throws ClassCastException       {@inheritDoc}
869	+	* @throws NullPointerException if <tt>toKey</tt> is null
870	+	*         and this map uses natural ordering, or its comparator
871	+	*         does not permit null keys
872	+	* @throws IllegalArgumentException {@inheritDoc}
873	+	* @since 1.6
874	+	*/
875	+	public NavigableMap<K,V> headMap(K toKey, boolean inclusive) {
876	+	return new AscendingSubMap(this,
877	+	true,  null,  true,
878	+	false, toKey, inclusive);
879	+	}
880	+
881	+	/**
882	+	* @throws ClassCastException       {@inheritDoc}
883	+	* @throws NullPointerException if <tt>fromKey</tt> is null
884	+	*         and this map uses natural ordering, or its comparator
885	+	*         does not permit null keys
886	+	* @throws IllegalArgumentException {@inheritDoc}
887	+	* @since 1.6
888	+	*/
889	+	public NavigableMap<K,V> tailMap(K fromKey, boolean inclusive) {
890	+	return new AscendingSubMap(this,
891	+	false, fromKey, inclusive,
892	+	true,  null,    true);
893	+	}
894	+
895	+	/**
896	+	* @throws ClassCastException       {@inheritDoc}
897	+	* @throws NullPointerException if <tt>fromKey</tt> or <tt>toKey</tt> is
898	+	*         null and this map uses natural ordering, or its comparator
899	+	*         does not permit null keys
900	+	* @throws IllegalArgumentException {@inheritDoc}
901	+	*/
902	+	public SortedMap<K,V> subMap(K fromKey, K toKey) {
903	+	return subMap(fromKey, true, toKey, false);
904	+	}
905	+
906	+	/**
907	+	* @throws ClassCastException       {@inheritDoc}
908	+	* @throws NullPointerException if <tt>toKey</tt> is null
909	+	*         and this map uses natural ordering, or its comparator
910	+	*         does not permit null keys
911	+	* @throws IllegalArgumentException {@inheritDoc}
912	+	*/
913	+	public SortedMap<K,V> headMap(K toKey) {
914	+	return headMap(toKey, false);
915	+	}
916	+
917	+	/**
918	+	* @throws ClassCastException       {@inheritDoc}
919	+	* @throws NullPointerException if <tt>fromKey</tt> is null
920	+	*         and this map uses natural ordering, or its comparator
921	+	*         does not permit null keys
922	+	* @throws IllegalArgumentException {@inheritDoc}
923	+	*/
924	+	public SortedMap<K,V> tailMap(K fromKey) {
925	+	return tailMap(fromKey, true);
926	+	}
927	+
928	+	// View class support
929	+
930		class Values extends AbstractCollection<V> {
931		public Iterator<V> iterator() {
932		return new ValueIterator(getFirstEntry());
#	Line 843 | Line 937 | public class TreeMap<K,V>
937		}
938
939		public boolean contains(Object o) {
940	<	for (Entry<K,V> e = getFirstEntry(); e != null; e = successor(e))
847	<	if (valEquals(e.getValue(), o))
848	<	return true;
849	<	return false;
940	>	return TreeMap.this.containsValue(o);
941		}
942
943		public boolean remove(Object o) {
#	Line 864 | Line 955 | public class TreeMap<K,V>
955		}
956		}
957
867	–	/**
868	–	* Returns a {@link Set} view of the mappings contained in this map.
869	–	* The set's iterator returns the entries in ascending key order.
870	–	* The set is backed by the map, so changes to the map are
871	–	* reflected in the set, and vice-versa.  If the map is modified
872	–	* while an iteration over the set is in progress (except through
873	–	* the iterator's own <tt>remove</tt> operation, or through the
874	–	* <tt>setValue</tt> operation on a map entry returned by the
875	–	* iterator) the results of the iteration are undefined.  The set
876	–	* supports element removal, which removes the corresponding
877	–	* mapping from the map, via the <tt>Iterator.remove</tt>,
878	–	* <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt> and
879	–	* <tt>clear</tt> operations.  It does not support the
880	–	* <tt>add</tt> or <tt>addAll</tt> operations.
881	–	*/
882	–	public Set<Map.Entry<K,V>> entrySet() {
883	–	Set<Map.Entry<K,V>> es = entrySet;
884	–	return (es != null) ? es : (entrySet = new EntrySet());
885	–	}
886	–
958		class EntrySet extends AbstractSet<Map.Entry<K,V>> {
959		public Iterator<Map.Entry<K,V>> iterator() {
960		return new EntryIterator(getFirstEntry());
#	Line 920 | Line 991 | public class TreeMap<K,V>
991		}
992		}
993
994	<	public Set<Map.Entry<K,V>> descendingEntrySet() {
995	<	Set<Map.Entry<K,V>> es = descendingEntrySet;
996	<	return (es != null) ? es : (descendingEntrySet = new DescendingEntrySet());
997	<	}
994	>	/*
995	>	* Unlike Values and EntrySet, the KeySet class is static,
996	>	* delegating to a NavigableMap to allow use by SubMaps, which
997	>	* outweighs the ugliness of needing type-tests for the following
998	>	* Iterator methods that are defined appropriately in main versus
999	>	* submap classes.
1000	>	*/
1001
1002	<	class DescendingEntrySet extends EntrySet {
1003	<	public Iterator<Map.Entry<K,V>> iterator() {
930	<	return new DescendingEntryIterator(getLastEntry());
931	<	}
1002	>	Iterator<K> keyIterator() {
1003	>	return new KeyIterator(getFirstEntry());
1004		}
1005
1006	<	public Set<K> descendingKeySet() {
1007	<	Set<K> ks = descendingKeySet;
936	<	return (ks != null) ? ks : (descendingKeySet = new DescendingKeySet());
1006	>	Iterator<K> descendingKeyIterator() {
1007	>	return new DescendingKeyIterator(getFirstEntry());
1008		}
1009
1010	<	class DescendingKeySet extends KeySet {
1011	<	public Iterator<K> iterator() {
1012	<	return new DescendingKeyIterator(getLastEntry());
1010	>	static final class KeySet<E> extends AbstractSet<E> implements NavigableSet<E> {
1011	>	private final NavigableMap<E, Object> m;
1012	>	KeySet(NavigableMap<E,Object> map) { m = map; }
1013	>
1014	>	public Iterator<E> iterator() {
1015	>	if (m instanceof TreeMap)
1016	>	return ((TreeMap<E,Object>)m).keyIterator();
1017	>	else
1018	>	return (Iterator<E>)(((TreeMap.NavigableSubMap)m).keyIterator());
1019	>	}
1020	>
1021	>	public Iterator<E> descendingIterator() {
1022	>	if (m instanceof TreeMap)
1023	>	return ((TreeMap<E,Object>)m).descendingKeyIterator();
1024	>	else
1025	>	return (Iterator<E>)(((TreeMap.NavigableSubMap)m).descendingKeyIterator());
1026	>	}
1027	>
1028	>	public int size() { return m.size(); }
1029	>	public boolean isEmpty() { return m.isEmpty(); }
1030	>	public boolean contains(Object o) { return m.containsKey(o); }
1031	>	public void clear() { m.clear(); }
1032	>	public E lower(E e) { return m.lowerKey(e); }
1033	>	public E floor(E e) { return m.floorKey(e); }
1034	>	public E ceiling(E e) { return m.ceilingKey(e); }
1035	>	public E higher(E e) { return m.higherKey(e); }
1036	>	public E first() { return m.firstKey(); }
1037	>	public E last() { return m.lastKey(); }
1038	>	public Comparator<? super E> comparator() { return m.comparator(); }
1039	>	public E pollFirst() {
1040	>	Map.Entry<E,Object> e = m.pollFirstEntry();
1041	>	return e == null? null : e.getKey();
1042	>	}
1043	>	public E pollLast() {
1044	>	Map.Entry<E,Object> e = m.pollLastEntry();
1045	>	return e == null? null : e.getKey();
1046	>	}
1047	>	public boolean remove(Object o) {
1048	>	int oldSize = size();
1049	>	m.remove(o);
1050	>	return size() != oldSize;
1051	>	}
1052	>	public NavigableSet<E> subSet(E fromElement, boolean fromInclusive,
1053	>	E toElement,   boolean toInclusive) {
1054	>	return new TreeSet<E>(m.subMap(fromElement, fromInclusive,
1055	>	toElement,   toInclusive));
1056	>	}
1057	>	public NavigableSet<E> headSet(E toElement, boolean inclusive) {
1058	>	return new TreeSet<E>(m.headMap(toElement, inclusive));
1059	>	}
1060	>	public NavigableSet<E> tailSet(E fromElement, boolean inclusive) {
1061	>	return new TreeSet<E>(m.tailMap(fromElement, inclusive));
1062	>	}
1063	>	public SortedSet<E> subSet(E fromElement, E toElement) {
1064	>	return subSet(fromElement, true, toElement, false);
1065	>	}
1066	>	public SortedSet<E> headSet(E toElement) {
1067	>	return headSet(toElement, false);
1068	>	}
1069	>	public SortedSet<E> tailSet(E fromElement) {
1070	>	return tailSet(fromElement, true);
1071	>	}
1072	>	public NavigableSet<E> descendingSet() {
1073	>	return new TreeSet(m.descendingMap());
1074		}
1075		}
1076
1077		/**
1078	<	* @throws ClassCastException       {@inheritDoc}
947	<	* @throws NullPointerException if <tt>fromKey</tt> or <tt>toKey</tt> is
948	<	*         null and this map uses natural ordering, or its comparator
949	<	*         does not permit null keys
950	<	* @throws IllegalArgumentException {@inheritDoc}
1078	>	* Base class for TreeMap Iterators
1079		*/
1080	<	public NavigableMap<K,V> navigableSubMap(K fromKey, K toKey) {
1081	<	return new SubMap(fromKey, toKey);
1080	>	abstract class PrivateEntryIterator<T> implements Iterator<T> {
1081	>	Entry<K,V> next;
1082	>	Entry<K,V> lastReturned;
1083	>	int expectedModCount;
1084	>
1085	>	PrivateEntryIterator(Entry<K,V> first) {
1086	>	expectedModCount = modCount;
1087	>	lastReturned = null;
1088	>	next = first;
1089	>	}
1090	>
1091	>	public final boolean hasNext() {
1092	>	return next != null;
1093	>	}
1094	>
1095	>	final Entry<K,V> nextEntry() {
1096	>	Entry<K,V> e = lastReturned = next;
1097	>	if (e == null)
1098	>	throw new NoSuchElementException();
1099	>	if (modCount != expectedModCount)
1100	>	throw new ConcurrentModificationException();
1101	>	next = successor(e);
1102	>	return e;
1103	>	}
1104	>
1105	>	final Entry<K,V> prevEntry() {
1106	>	Entry<K,V> e = lastReturned= next;
1107	>	if (e == null)
1108	>	throw new NoSuchElementException();
1109	>	if (modCount != expectedModCount)
1110	>	throw new ConcurrentModificationException();
1111	>	next = predecessor(e);
1112	>	return e;
1113	>	}
1114	>
1115	>	public void remove() {
1116	>	if (lastReturned == null)
1117	>	throw new IllegalStateException();
1118	>	if (modCount != expectedModCount)
1119	>	throw new ConcurrentModificationException();
1120	>	// deleted entries are replaced by their successors
1121	>	if (lastReturned.left != null && lastReturned.right != null)
1122	>	next = lastReturned;
1123	>	deleteEntry(lastReturned);
1124	>	expectedModCount++;
1125	>	lastReturned = null;
1126	>	}
1127	>	}
1128	>
1129	>	final class EntryIterator extends PrivateEntryIterator<Map.Entry<K,V>> {
1130	>	EntryIterator(Entry<K,V> first) {
1131	>	super(first);
1132	>	}
1133	>	public Map.Entry<K,V> next() {
1134	>	return nextEntry();
1135	>	}
1136	>	}
1137	>
1138	>	final class ValueIterator extends PrivateEntryIterator<V> {
1139	>	ValueIterator(Entry<K,V> first) {
1140	>	super(first);
1141	>	}
1142	>	public V next() {
1143	>	return nextEntry().value;
1144	>	}
1145	>	}
1146	>
1147	>	final class KeyIterator extends PrivateEntryIterator<K> {
1148	>	KeyIterator(Entry<K,V> first) {
1149	>	super(first);
1150	>	}
1151	>	public K next() {
1152	>	return nextEntry().key;
1153	>	}
1154		}
1155
1156	+	final class DescendingKeyIterator extends PrivateEntryIterator<K> {
1157	+	DescendingKeyIterator(Entry<K,V> first) {
1158	+	super(first);
1159	+	}
1160	+	public K next() {
1161	+	return prevEntry().key;
1162	+	}
1163	+	}
1164	+
1165	+	// Little utilities
1166	+
1167		/**
1168	<	* @throws ClassCastException       {@inheritDoc}
958	<	* @throws NullPointerException if <tt>toKey</tt> is null
959	<	*         and this map uses natural ordering, or its comparator
960	<	*         does not permit null keys
961	<	* @throws IllegalArgumentException {@inheritDoc}
1168	>	* Compares two keys using the correct comparison method for this TreeMap.
1169		*/
1170	<	public NavigableMap<K,V> navigableHeadMap(K toKey) {
1171	<	return new SubMap(toKey, true);
1170	>	final int compare(Object k1, Object k2) {
1171	>	return comparator==null ? ((Comparable<? super K>)k1).compareTo((K)k2)
1172	>	: comparator.compare((K)k1, (K)k2);
1173		}
1174
1175		/**
1176	<	* @throws ClassCastException       {@inheritDoc}
1177	<	* @throws NullPointerException if <tt>fromKey</tt> is null
970	<	*         and this map uses natural ordering, or its comparator
971	<	*         does not permit null keys
972	<	* @throws IllegalArgumentException {@inheritDoc}
1176	>	* Test two values for equality.  Differs from o1.equals(o2) only in
1177	>	* that it copes with <tt>null</tt> o1 properly.
1178		*/
1179	<	public NavigableMap<K,V> navigableTailMap(K fromKey) {
1180	<	return new SubMap(fromKey, false);
1179	>	final static boolean valEquals(Object o1, Object o2) {
1180	>	return (o1==null ? o2==null : o1.equals(o2));
1181		}
1182
1183		/**
1184	<	* Equivalent to {@link #navigableSubMap} but with a return type
980	<	* conforming to the <tt>SortedMap</tt> interface.
981	<	*
982	<	* <p>{@inheritDoc}
983	<	*
984	<	* @throws ClassCastException       {@inheritDoc}
985	<	* @throws NullPointerException if <tt>fromKey</tt> or <tt>toKey</tt> is
986	<	*         null and this map uses natural ordering, or its comparator
987	<	*         does not permit null keys
988	<	* @throws IllegalArgumentException {@inheritDoc}
1184	>	* Return SimpleImmutableEntry for entry, or null if null
1185		*/
1186	<	public SortedMap<K,V> subMap(K fromKey, K toKey) {
1187	<	return new SubMap(fromKey, toKey);
1186	>	static <K,V> Map.Entry<K,V> exportEntry(TreeMap.Entry<K,V> e) {
1187	>	return e == null? null :
1188	>	new AbstractMap.SimpleImmutableEntry<K,V>(e);
1189		}
1190
1191		/**
1192	<	* Equivalent to {@link #navigableHeadMap} but with a return type
996	<	* conforming to the <tt>SortedMap</tt> interface.
997	<	*
998	<	* <p>{@inheritDoc}
999	<	*
1000	<	* @throws ClassCastException       {@inheritDoc}
1001	<	* @throws NullPointerException if <tt>toKey</tt> is null
1002	<	*         and this map uses natural ordering, or its comparator
1003	<	*         does not permit null keys
1004	<	* @throws IllegalArgumentException {@inheritDoc}
1192	>	* Return key for entry, or null if null
1193		*/
1194	<	public SortedMap<K,V> headMap(K toKey) {
1195	<	return new SubMap(toKey, true);
1194	>	static <K,V> K keyOrNull(TreeMap.Entry<K,V> e) {
1195	>	return e == null? null : e.key;
1196		}
1197
1198		/**
1199	<	* Equivalent to {@link #navigableTailMap} but with a return type
1200	<	* conforming to the <tt>SortedMap</tt> interface.
1013	<	*
1014	<	* <p>{@inheritDoc}
1015	<	*
1016	<	* @throws ClassCastException       {@inheritDoc}
1017	<	* @throws NullPointerException if <tt>fromKey</tt> is null
1018	<	*         and this map uses natural ordering, or its comparator
1019	<	*         does not permit null keys
1020	<	* @throws IllegalArgumentException {@inheritDoc}
1199	>	* Returns the key corresponding to the specified Entry.
1200	>	* @throws NoSuchElementException if the Entry is null
1201		*/
1202	<	public SortedMap<K,V> tailMap(K fromKey) {
1203	<	return new SubMap(fromKey, false);
1202	>	static <K> K key(Entry<K,?> e) {
1203	>	if (e==null)
1204	>	throw new NoSuchElementException();
1205	>	return e.key;
1206		}
1207
1026	–	private class SubMap
1027	–	extends AbstractMap<K,V>
1028	–	implements NavigableMap<K,V>, java.io.Serializable {
1029	–	private static final long serialVersionUID = -6520786458950516097L;
1208
1209	+	// SubMaps
1210	+
1211	+	/**
1212	+	* @serial include
1213	+	*/
1214	+	static abstract class NavigableSubMap<K,V> extends AbstractMap<K,V>
1215	+	implements NavigableMap<K,V>, java.io.Serializable {
1216		/**
1217	<	* fromKey is significant only if fromStart is false.  Similarly,
1033	<	* toKey is significant only if toStart is false.
1217	>	* The backing map.
1218		*/
1219	<	private boolean fromStart = false, toEnd = false;
1036	<	private K fromKey, toKey;
1219	>	final TreeMap<K,V> m;
1220
1221	<	SubMap(K fromKey, K toKey) {
1222	<	if (compare(fromKey, toKey) > 0)
1223	<	throw new IllegalArgumentException("fromKey > toKey");
1224	<	this.fromKey = fromKey;
1225	<	this.toKey = toKey;
1226	<	}
1227	<
1228	<	SubMap(K key, boolean headMap) {
1229	<	compare(key, key); // Type-check key
1230	<
1231	<	if (headMap) {
1232	<	fromStart = true;
1233	<	toKey = key;
1221	>	/**
1222	>	* Endpoints are represented as triples (fromStart, lo,
1223	>	* loInclusive) and (toEnd, hi, hiInclusive). If fromStart is
1224	>	* true, then the low (absolute) bound is the start of the
1225	>	* backing map, and the other values are ignored. Otherwise,
1226	>	* if loInclusive is true, lo is the inclusive bound, else lo
1227	>	* is the exclusive bound. Similarly for the upper bound.
1228	>	*/
1229	>	final K lo, hi;
1230	>	final boolean fromStart, toEnd;
1231	>	final boolean loInclusive, hiInclusive;
1232	>
1233	>	NavigableSubMap(TreeMap<K,V> m,
1234	>	boolean fromStart, K lo, boolean loInclusive,
1235	>	boolean toEnd,     K hi, boolean hiInclusive) {
1236	>	if (!fromStart && !toEnd) {
1237	>	if (m.compare(lo, hi) > 0)
1238	>	throw new IllegalArgumentException("fromKey > toKey");
1239		} else {
1240	<	toEnd = true;
1241	<	fromKey = key;
1240	>	if (!fromStart) // type check
1241	>	m.compare(lo, lo);
1242	>	if (!toEnd)
1243	>	m.compare(hi, hi);
1244		}
1055	–	}
1245
1246	<	SubMap(boolean fromStart, K fromKey, boolean toEnd, K toKey) {
1246	>	this.m = m;
1247		this.fromStart = fromStart;
1248	<	this.fromKey= fromKey;
1248	>	this.lo = lo;
1249	>	this.loInclusive = loInclusive;
1250		this.toEnd = toEnd;
1251	<	this.toKey = toKey;
1251	>	this.hi = hi;
1252	>	this.hiInclusive = hiInclusive;
1253	>	}
1254	>
1255	>	// internal utilities
1256	>
1257	>	final boolean tooLow(Object key) {
1258	>	if (!fromStart) {
1259	>	int c = m.compare(key, lo);
1260	>	if (c < 0 || (c == 0 && !loInclusive))
1261	>	return true;
1262	>	}
1263	>	return false;
1264	>	}
1265	>
1266	>	final boolean tooHigh(Object key) {
1267	>	if (!toEnd) {
1268	>	int c = m.compare(key, hi);
1269	>	if (c > 0 || (c == 0 && !hiInclusive))
1270	>	return true;
1271	>	}
1272	>	return false;
1273	>	}
1274	>
1275	>	final boolean inRange(Object key) {
1276	>	return !tooLow(key) && !tooHigh(key);
1277		}
1278
1279	+	final boolean inClosedRange(Object key) {
1280	+	return (fromStart || m.compare(key, lo) >= 0)
1281	+	&& (toEnd || m.compare(hi, key) >= 0);
1282	+	}
1283	+
1284	+	final boolean inRange(Object key, boolean inclusive) {
1285	+	return inclusive ? inRange(key) : inClosedRange(key);
1286	+	}
1287	+
1288	+	/*
1289	+	* Absolute versions of relation operations.
1290	+	* Subclasses map to these using like-named "sub"
1291	+	* versions that invert senses for descending maps
1292	+	*/
1293	+
1294	+	final TreeMap.Entry<K,V> absLowest() {
1295	+	TreeMap.Entry<K,V> e =
1296	+	(fromStart ?  m.getFirstEntry() :
1297	+	(loInclusive ? m.getCeilingEntry(lo) :
1298	+	m.getHigherEntry(lo)));
1299	+	return (e == null || tooHigh(e.key)) ? null : e;
1300	+	}
1301	+
1302	+	final TreeMap.Entry<K,V> absHighest() {
1303	+	TreeMap.Entry<K,V> e =
1304	+	(toEnd ?  m.getLastEntry() :
1305	+	(hiInclusive ?  m.getFloorEntry(hi) :
1306	+	m.getLowerEntry(hi)));
1307	+	return (e == null || tooLow(e.key)) ? null : e;
1308	+	}
1309	+
1310	+	final TreeMap.Entry<K,V> absCeiling(K key) {
1311	+	if (tooLow(key))
1312	+	return absLowest();
1313	+	TreeMap.Entry<K,V> e = m.getCeilingEntry(key);
1314	+	return (e == null || tooHigh(e.key)) ? null : e;
1315	+	}
1316	+
1317	+	final TreeMap.Entry<K,V> absHigher(K key) {
1318	+	if (tooLow(key))
1319	+	return absLowest();
1320	+	TreeMap.Entry<K,V> e = m.getHigherEntry(key);
1321	+	return (e == null || tooHigh(e.key)) ? null : e;
1322	+	}
1323	+
1324	+	final TreeMap.Entry<K,V> absFloor(K key) {
1325	+	if (tooHigh(key))
1326	+	return absHighest();
1327	+	TreeMap.Entry<K,V> e = m.getFloorEntry(key);
1328	+	return (e == null || tooLow(e.key)) ? null : e;
1329	+	}
1330	+
1331	+	final TreeMap.Entry<K,V> absLower(K key) {
1332	+	if (tooHigh(key))
1333	+	return absHighest();
1334	+	TreeMap.Entry<K,V> e = m.getLowerEntry(key);
1335	+	return (e == null || tooLow(e.key)) ? null : e;
1336	+	}
1337	+
1338	+	/** Returns the absolute high fence for ascending traversal */
1339	+	final TreeMap.Entry<K,V> absHighFence() {
1340	+	return (toEnd ? null : (hiInclusive ?
1341	+	m.getHigherEntry(hi) :
1342	+	m.getCeilingEntry(hi)));
1343	+	}
1344	+
1345	+	/** Return the absolute low fence for descending traversal  */
1346	+	final TreeMap.Entry<K,V> absLowFence() {
1347	+	return (fromStart ? null : (loInclusive ?
1348	+	m.getLowerEntry(lo) :
1349	+	m.getFloorEntry(lo)));
1350	+	}
1351	+
1352	+	// Abstract methods defined in ascending vs descending classes
1353	+	// These relay to the appropriate absolute versions
1354	+
1355	+	abstract TreeMap.Entry<K,V> subLowest();
1356	+	abstract TreeMap.Entry<K,V> subHighest();
1357	+	abstract TreeMap.Entry<K,V> subCeiling(K key);
1358	+	abstract TreeMap.Entry<K,V> subHigher(K key);
1359	+	abstract TreeMap.Entry<K,V> subFloor(K key);
1360	+	abstract TreeMap.Entry<K,V> subLower(K key);
1361	+
1362	+	/** Returns ascending iterator from the perspective of this submap */
1363	+	abstract Iterator<K> keyIterator();
1364	+
1365	+	/** Returns descending iterator from the perspective of this submap */
1366	+	abstract Iterator<K> descendingKeyIterator();
1367	+
1368	+	// public methods
1369	+
1370		public boolean isEmpty() {
1371	<	return entrySet().isEmpty();
1371	>	return (fromStart && toEnd) ? m.isEmpty() : entrySet().isEmpty();
1372		}
1373
1374	<	public boolean containsKey(Object key) {
1375	<	return inRange(key) && TreeMap.this.containsKey(key);
1374	>	public int size() {
1375	>	return (fromStart && toEnd) ? m.size() : entrySet().size();
1376		}
1377
1378	<	public V get(Object key) {
1379	<	if (!inRange(key))
1074	<	return null;
1075	<	return TreeMap.this.get(key);
1378	>	public final boolean containsKey(Object key) {
1379	>	return inRange(key) && m.containsKey(key);
1380		}
1381
1382	<	public V put(K key, V value) {
1382	>	public final V put(K key, V value) {
1383		if (!inRange(key))
1384		throw new IllegalArgumentException("key out of range");
1385	<	return TreeMap.this.put(key, value);
1385	>	return m.put(key, value);
1386		}
1387
1388	<	public V remove(Object key) {
1389	<	if (!inRange(key))
1086	<	return null;
1087	<	return TreeMap.this.remove(key);
1388	>	public final V get(Object key) {
1389	>	return !inRange(key)? null :  m.get(key);
1390		}
1391
1392	<	public Comparator<? super K> comparator() {
1393	<	return comparator;
1392	>	public final V remove(Object key) {
1393	>	return !inRange(key)? null  : m.remove(key);
1394		}
1395
1396	<	public K firstKey() {
1397	<	TreeMap.Entry<K,V> e = fromStart ? getFirstEntry() : getCeilingEntry(fromKey);
1096	<	K first = key(e);
1097	<	if (!toEnd && compare(first, toKey) >= 0)
1098	<	throw new NoSuchElementException();
1099	<	return first;
1396	>	public final Map.Entry<K,V> ceilingEntry(K key) {
1397	>	return exportEntry(subCeiling(key));
1398		}
1399
1400	<	public K lastKey() {
1401	<	TreeMap.Entry<K,V> e = toEnd ? getLastEntry() : getLowerEntry(toKey);
1104	<	K last = key(e);
1105	<	if (!fromStart && compare(last, fromKey) < 0)
1106	<	throw new NoSuchElementException();
1107	<	return last;
1400	>	public final K ceilingKey(K key) {
1401	>	return keyOrNull(subCeiling(key));
1402		}
1403
1404	<	public Map.Entry<K,V> firstEntry() {
1405	<	TreeMap.Entry<K,V> e = fromStart ?
1112	<	getFirstEntry() : getCeilingEntry(fromKey);
1113	<	if (e == null || (!toEnd && compare(e.key, toKey) >= 0))
1114	<	return null;
1115	<	return e;
1404	>	public final Map.Entry<K,V> higherEntry(K key) {
1405	>	return exportEntry(subHigher(key));
1406		}
1407
1408	<	public Map.Entry<K,V> lastEntry() {
1409	<	TreeMap.Entry<K,V> e = toEnd ?
1120	<	getLastEntry() : getLowerEntry(toKey);
1121	<	if (e == null || (!fromStart && compare(e.key, fromKey) < 0))
1122	<	return null;
1123	<	return e;
1408	>	public final K higherKey(K key) {
1409	>	return keyOrNull(subHigher(key));
1410		}
1411
1412	<	public Map.Entry<K,V> pollFirstEntry() {
1413	<	TreeMap.Entry<K,V> e = fromStart ?
1128	<	getFirstEntry() : getCeilingEntry(fromKey);
1129	<	if (e == null || (!toEnd && compare(e.key, toKey) >= 0))
1130	<	return null;
1131	<	Map.Entry<K,V> result = new AbstractMap.SimpleImmutableEntry<K,V>(e);
1132	<	deleteEntry(e);
1133	<	return result;
1412	>	public final Map.Entry<K,V> floorEntry(K key) {
1413	>	return exportEntry(subFloor(key));
1414		}
1415
1416	<	public Map.Entry<K,V> pollLastEntry() {
1417	<	TreeMap.Entry<K,V> e = toEnd ?
1138	<	getLastEntry() : getLowerEntry(toKey);
1139	<	if (e == null || (!fromStart && compare(e.key, fromKey) < 0))
1140	<	return null;
1141	<	Map.Entry<K,V> result = new AbstractMap.SimpleImmutableEntry<K,V>(e);
1142	<	deleteEntry(e);
1143	<	return result;
1416	>	public final K floorKey(K key) {
1417	>	return keyOrNull(subFloor(key));
1418		}
1419
1420	<	private TreeMap.Entry<K,V> subceiling(K key) {
1421	<	TreeMap.Entry<K,V> e = (!fromStart && compare(key, fromKey) < 0)?
1148	<	getCeilingEntry(fromKey) : getCeilingEntry(key);
1149	<	if (e == null || (!toEnd && compare(e.key, toKey) >= 0))
1150	<	return null;
1151	<	return e;
1420	>	public final Map.Entry<K,V> lowerEntry(K key) {
1421	>	return exportEntry(subLower(key));
1422		}
1423
1424	<	public Map.Entry<K,V> ceilingEntry(K key) {
1425	<	TreeMap.Entry<K,V> e = subceiling(key);
1156	<	return e == null? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
1424	>	public final K lowerKey(K key) {
1425	>	return keyOrNull(subLower(key));
1426		}
1427
1428	<	public K ceilingKey(K key) {
1429	<	TreeMap.Entry<K,V> e = subceiling(key);
1161	<	return e == null? null : e.key;
1428	>	public final K firstKey() {
1429	>	return key(subLowest());
1430		}
1431
1432	<
1433	<	private TreeMap.Entry<K,V> subhigher(K key) {
1166	<	TreeMap.Entry<K,V> e = (!fromStart && compare(key, fromKey) < 0)?
1167	<	getCeilingEntry(fromKey) : getHigherEntry(key);
1168	<	if (e == null || (!toEnd && compare(e.key, toKey) >= 0))
1169	<	return null;
1170	<	return e;
1432	>	public final K lastKey() {
1433	>	return key(subHighest());
1434		}
1435
1436	<	public Map.Entry<K,V> higherEntry(K key) {
1437	<	TreeMap.Entry<K,V> e = subhigher(key);
1175	<	return e == null? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
1436	>	public final Map.Entry<K,V> firstEntry() {
1437	>	return exportEntry(subLowest());
1438		}
1439
1440	<	public K higherKey(K key) {
1441	<	TreeMap.Entry<K,V> e = subhigher(key);
1180	<	return e == null? null : e.key;
1440	>	public final Map.Entry<K,V> lastEntry() {
1441	>	return exportEntry(subHighest());
1442		}
1443
1444	<	private TreeMap.Entry<K,V> subfloor(K key) {
1445	<	TreeMap.Entry<K,V> e = (!toEnd && compare(key, toKey) >= 0)?
1446	<	getLowerEntry(toKey) : getFloorEntry(key);
1447	<	if (e == null || (!fromStart && compare(e.key, fromKey) < 0))
1448	<	return null;
1449	<	return e;
1444	>	public final Map.Entry<K,V> pollFirstEntry() {
1445	>	TreeMap.Entry<K,V> e = subLowest();
1446	>	Map.Entry<K,V> result = exportEntry(e);
1447	>	if (e != null)
1448	>	m.deleteEntry(e);
1449	>	return result;
1450		}
1451
1452	<	public Map.Entry<K,V> floorEntry(K key) {
1453	<	TreeMap.Entry<K,V> e = subfloor(key);
1454	<	return e == null? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
1452	>	public final Map.Entry<K,V> pollLastEntry() {
1453	>	TreeMap.Entry<K,V> e = subHighest();
1454	>	Map.Entry<K,V> result = exportEntry(e);
1455	>	if (e != null)
1456	>	m.deleteEntry(e);
1457	>	return result;
1458		}
1459
1460	<	public K floorKey(K key) {
1461	<	TreeMap.Entry<K,V> e = subfloor(key);
1462	<	return e == null? null : e.key;
1460	>	// Views
1461	>	transient NavigableMap<K,V> descendingMapView = null;
1462	>	transient EntrySetView entrySetView = null;
1463	>	transient KeySet<K> navigableKeySetView = null;
1464	>
1465	>	public final NavigableSet<K> navigableKeySet() {
1466	>	KeySet<K> nksv = navigableKeySetView;
1467	>	return (nksv != null) ? nksv :
1468	>	(navigableKeySetView = new TreeMap.KeySet(this));
1469		}
1470
1471	<	private TreeMap.Entry<K,V> sublower(K key) {
1472	<	TreeMap.Entry<K,V> e = (!toEnd && compare(key, toKey) >= 0)?
1203	<	getLowerEntry(toKey) :  getLowerEntry(key);
1204	<	if (e == null || (!fromStart && compare(e.key, fromKey) < 0))
1205	<	return null;
1206	<	return e;
1471	>	public final Set<K> keySet() {
1472	>	return navigableKeySet();
1473		}
1474
1475	<	public Map.Entry<K,V> lowerEntry(K key) {
1476	<	TreeMap.Entry<K,V> e = sublower(key);
1211	<	return e == null? null : new AbstractMap.SimpleImmutableEntry<K,V>(e);
1475	>	public NavigableSet<K> descendingKeySet() {
1476	>	return descendingMap().navigableKeySet();
1477		}
1478
1479	<	public K lowerKey(K key) {
1480	<	TreeMap.Entry<K,V> e = sublower(key);
1216	<	return e == null? null : e.key;
1479	>	public final SortedMap<K,V> subMap(K fromKey, K toKey) {
1480	>	return subMap(fromKey, true, toKey, false);
1481		}
1482
1483	<	private transient Set<Map.Entry<K,V>> entrySet = null;
1483	>	public final SortedMap<K,V> headMap(K toKey) {
1484	>	return headMap(toKey, false);
1485	>	}
1486
1487	<	public Set<Map.Entry<K,V>> entrySet() {
1488	<	Set<Map.Entry<K,V>> es = entrySet;
1223	<	return (es != null)? es : (entrySet = new EntrySetView());
1487	>	public final SortedMap<K,V> tailMap(K fromKey) {
1488	>	return tailMap(fromKey, true);
1489		}
1490
1491	<	private class EntrySetView extends AbstractSet<Map.Entry<K,V>> {
1491	>	// View classes
1492	>
1493	>	abstract class EntrySetView extends AbstractSet<Map.Entry<K,V>> {
1494		private transient int size = -1, sizeModCount;
1495
1496		public int size() {
1497	<	if (size == -1 || sizeModCount != TreeMap.this.modCount) {
1498	<	size = 0;  sizeModCount = TreeMap.this.modCount;
1497	>	if (fromStart && toEnd)
1498	>	return m.size();
1499	>	if (size == -1 || sizeModCount != m.modCount) {
1500	>	sizeModCount = m.modCount;
1501	>	size = 0;
1502		Iterator i = iterator();
1503		while (i.hasNext()) {
1504		size++;
#	Line 1239 | Line 1509 | public class TreeMap<K,V>
1509		}
1510
1511		public boolean isEmpty() {
1512	<	return !iterator().hasNext();
1512	>	TreeMap.Entry<K,V> n = absLowest();
1513	>	return n == null || tooHigh(n.key);
1514		}
1515
1516		public boolean contains(Object o) {
#	Line 1249 | Line 1520 | public class TreeMap<K,V>
1520		K key = entry.getKey();
1521		if (!inRange(key))
1522		return false;
1523	<	TreeMap.Entry node = getEntry(key);
1523	>	TreeMap.Entry node = m.getEntry(key);
1524		return node != null &&
1525	<	valEquals(node.getValue(), entry.getValue());
1525	>	valEquals(node.getValue(), entry.getValue());
1526		}
1527
1528		public boolean remove(Object o) {
#	Line 1261 | Line 1532 | public class TreeMap<K,V>
1532		K key = entry.getKey();
1533		if (!inRange(key))
1534		return false;
1535	<	TreeMap.Entry<K,V> node = getEntry(key);
1535	>	TreeMap.Entry<K,V> node = m.getEntry(key);
1536		if (node!=null && valEquals(node.getValue(),entry.getValue())){
1537	<	deleteEntry(node);
1537	>	m.deleteEntry(node);
1538		return true;
1539		}
1540		return false;
1541		}
1271	–
1272	–	public Iterator<Map.Entry<K,V>> iterator() {
1273	–	return new SubMapEntryIterator(
1274	–	(fromStart ? getFirstEntry() : getCeilingEntry(fromKey)),
1275	–	(toEnd     ? null            : getCeilingEntry(toKey)));
1276	–	}
1542		}
1543
1544	<	private transient Set<Map.Entry<K,V>> descendingEntrySetView = null;
1545	<	private transient Set<K> descendingKeySetView = null;
1546	<
1547	<	public Set<Map.Entry<K,V>> descendingEntrySet() {
1548	<	Set<Map.Entry<K,V>> es = descendingEntrySetView;
1549	<	return (es != null) ? es :
1550	<	(descendingEntrySetView = new DescendingEntrySetView());
1551	<	}
1287	<
1288	<	public Set<K> descendingKeySet() {
1289	<	Set<K> ks = descendingKeySetView;
1290	<	return (ks != null) ? ks :
1291	<	(descendingKeySetView = new DescendingKeySetView());
1292	<	}
1544	>	/**
1545	>	* Iterators for SubMaps
1546	>	*/
1547	>	abstract class SubMapIterator<T> implements Iterator<T> {
1548	>	TreeMap.Entry<K,V> lastReturned;
1549	>	TreeMap.Entry<K,V> next;
1550	>	final K fenceKey;
1551	>	int expectedModCount;
1552
1553	<	private class DescendingEntrySetView extends EntrySetView {
1554	<	public Iterator<Map.Entry<K,V>> iterator() {
1555	<	return new DescendingSubMapEntryIterator
1556	<	((toEnd     ? getLastEntry()  : getLowerEntry(toKey)),
1557	<	(fromStart ? null            : getLowerEntry(fromKey)));
1553	>	SubMapIterator(TreeMap.Entry<K,V> first,
1554	>	TreeMap.Entry<K,V> fence) {
1555	>	expectedModCount = m.modCount;
1556	>	lastReturned = null;
1557	>	next = first;
1558	>	fenceKey = fence == null ? null : fence.key;
1559		}
1300	–	}
1560
1561	<	private class DescendingKeySetView extends AbstractSet<K> {
1562	<	public Iterator<K> iterator() {
1563	<	return new Iterator<K>() {
1305	<	private Iterator<Entry<K,V>> i = descendingEntrySet().iterator();
1561	>	public final boolean hasNext() {
1562	>	return next != null && next.key != fenceKey;
1563	>	}
1564
1565	<	public boolean hasNext() { return i.hasNext(); }
1566	<	public K next() { return i.next().getKey(); }
1567	<	public void remove() { i.remove(); }
1568	<	};
1565	>	final TreeMap.Entry<K,V> nextEntry() {
1566	>	TreeMap.Entry<K,V> e = lastReturned = next;
1567	>	if (e == null || e.key == fenceKey)
1568	>	throw new NoSuchElementException();
1569	>	if (m.modCount != expectedModCount)
1570	>	throw new ConcurrentModificationException();
1571	>	next = successor(e);
1572	>	return e;
1573		}
1574
1575	<	public int size() {
1576	<	return SubMap.this.size();
1575	>	final TreeMap.Entry<K,V> prevEntry() {
1576	>	TreeMap.Entry<K,V> e = lastReturned = next;
1577	>	if (e == null || e.key == fenceKey)
1578	>	throw new NoSuchElementException();
1579	>	if (m.modCount != expectedModCount)
1580	>	throw new ConcurrentModificationException();
1581	>	next = predecessor(e);
1582	>	return e;
1583		}
1584
1585	<	public boolean contains(Object k) {
1586	<	return SubMap.this.containsKey(k);
1585	>	final void removeAscending() {
1586	>	if (lastReturned == null)
1587	>	throw new IllegalStateException();
1588	>	if (m.modCount != expectedModCount)
1589	>	throw new ConcurrentModificationException();
1590	>	// deleted entries are replaced by their successors
1591	>	if (lastReturned.left != null && lastReturned.right != null)
1592	>	next = lastReturned;
1593	>	m.deleteEntry(lastReturned);
1594	>	lastReturned = null;
1595	>	expectedModCount = m.modCount;
1596		}
1320	–	}
1597
1598	<	public NavigableMap<K,V> navigableSubMap(K fromKey, K toKey) {
1599	<	if (!inRange2(fromKey))
1600	<	throw new IllegalArgumentException("fromKey out of range");
1601	<	if (!inRange2(toKey))
1602	<	throw new IllegalArgumentException("toKey out of range");
1603	<	return new SubMap(fromKey, toKey);
1604	<	}
1598	>	final void removeDescending() {
1599	>	if (lastReturned == null)
1600	>	throw new IllegalStateException();
1601	>	if (m.modCount != expectedModCount)
1602	>	throw new ConcurrentModificationException();
1603	>	m.deleteEntry(lastReturned);
1604	>	lastReturned = null;
1605	>	expectedModCount = m.modCount;
1606	>	}
1607
1330	–	public NavigableMap<K,V> navigableHeadMap(K toKey) {
1331	–	if (!inRange2(toKey))
1332	–	throw new IllegalArgumentException("toKey out of range");
1333	–	return new SubMap(fromStart, fromKey, false, toKey);
1608		}
1609
1610	<	public NavigableMap<K,V> navigableTailMap(K fromKey) {
1611	<	if (!inRange2(fromKey))
1612	<	throw new IllegalArgumentException("fromKey out of range");
1613	<	return new SubMap(false, fromKey, toEnd, toKey);
1614	<	}
1615	<
1616	<	public SortedMap<K,V> subMap(K fromKey, K toKey) {
1617	<	return navigableSubMap(fromKey, toKey);
1610	>	final class SubMapEntryIterator extends SubMapIterator<Map.Entry<K,V>> {
1611	>	SubMapEntryIterator(TreeMap.Entry<K,V> first,
1612	>	TreeMap.Entry<K,V> fence) {
1613	>	super(first, fence);
1614	>	}
1615	>	public Map.Entry<K,V> next() {
1616	>	return nextEntry();
1617	>	}
1618	>	public void remove() {
1619	>	removeAscending();
1620	>	}
1621		}
1622
1623	<	public SortedMap<K,V> headMap(K toKey) {
1624	<	return navigableHeadMap(toKey);
1623	>	final class SubMapKeyIterator extends SubMapIterator<K> {
1624	>	SubMapKeyIterator(TreeMap.Entry<K,V> first,
1625	>	TreeMap.Entry<K,V> fence) {
1626	>	super(first, fence);
1627	>	}
1628	>	public K next() {
1629	>	return nextEntry().key;
1630	>	}
1631	>	public void remove() {
1632	>	removeAscending();
1633	>	}
1634		}
1635
1636	<	public SortedMap<K,V> tailMap(K fromKey) {
1637	<	return navigableTailMap(fromKey);
1638	<	}
1636	>	final class DescendingSubMapEntryIterator extends SubMapIterator<Map.Entry<K,V>> {
1637	>	DescendingSubMapEntryIterator(TreeMap.Entry<K,V> last,
1638	>	TreeMap.Entry<K,V> fence) {
1639	>	super(last, fence);
1640	>	}
1641
1642	<	private boolean inRange(Object key) {
1643	<	return (fromStart || compare(key, fromKey) >= 0) &&
1644	<	(toEnd     || compare(key, toKey)   <  0);
1642	>	public Map.Entry<K,V> next() {
1643	>	return prevEntry();
1644	>	}
1645	>	public void remove() {
1646	>	removeDescending();
1647	>	}
1648		}
1649
1650	<	// This form allows the high endpoint (as well as all legit keys)
1651	<	private boolean inRange2(Object key) {
1652	<	return (fromStart || compare(key, fromKey) >= 0) &&
1653	<	(toEnd     || compare(key, toKey)   <= 0);
1650	>	final class DescendingSubMapKeyIterator extends SubMapIterator<K> {
1651	>	DescendingSubMapKeyIterator(TreeMap.Entry<K,V> last,
1652	>	TreeMap.Entry<K,V> fence) {
1653	>	super(last, fence);
1654	>	}
1655	>	public K next() {
1656	>	return prevEntry().key;
1657	>	}
1658	>	public void remove() {
1659	>	removeDescending();
1660	>	}
1661		}
1662		}
1663
1664		/**
1665	<	* TreeMap Iterator.
1665	>	* @serial include
1666		*/
1667	<	abstract class PrivateEntryIterator<T> implements Iterator<T> {
1668	<	int expectedModCount = TreeMap.this.modCount;
1371	<	Entry<K,V> lastReturned = null;
1372	<	Entry<K,V> next;
1667	>	static final class AscendingSubMap<K,V> extends NavigableSubMap<K,V> {
1668	>	private static final long serialVersionUID = 912986545866124060L;
1669
1670	<	PrivateEntryIterator(Entry<K,V> first) {
1671	<	next = first;
1670	>	AscendingSubMap(TreeMap<K,V> m,
1671	>	boolean fromStart, K lo, boolean loInclusive,
1672	>	boolean toEnd,     K hi, boolean hiInclusive) {
1673	>	super(m, fromStart, lo, loInclusive, toEnd, hi, hiInclusive);
1674		}
1675
1676	<	public boolean hasNext() {
1677	<	return next != null;
1676	>	public Comparator<? super K> comparator() {
1677	>	return m.comparator();
1678		}
1679
1680	<	Entry<K,V> nextEntry() {
1681	<	if (next == null)
1682	<	throw new NoSuchElementException();
1683	<	if (modCount != expectedModCount)
1684	<	throw new ConcurrentModificationException();
1685	<	lastReturned = next;
1686	<	next = successor(next);
1687	<	return lastReturned;
1680	>	public NavigableMap<K,V> subMap(K fromKey, boolean fromInclusive,
1681	>	K toKey,   boolean toInclusive) {
1682	>	if (!inRange(fromKey, fromInclusive))
1683	>	throw new IllegalArgumentException("fromKey out of range");
1684	>	if (!inRange(toKey, toInclusive))
1685	>	throw new IllegalArgumentException("toKey out of range");
1686	>	return new AscendingSubMap(m,
1687	>	false, fromKey, fromInclusive,
1688	>	false, toKey,   toInclusive);
1689		}
1690
1691	<	public void remove() {
1692	<	if (lastReturned == null)
1693	<	throw new IllegalStateException();
1694	<	if (modCount != expectedModCount)
1695	<	throw new ConcurrentModificationException();
1696	<	if (lastReturned.left != null && lastReturned.right != null)
1398	<	next = lastReturned;
1399	<	deleteEntry(lastReturned);
1400	<	expectedModCount++;
1401	<	lastReturned = null;
1691	>	public NavigableMap<K,V> headMap(K toKey, boolean inclusive) {
1692	>	if (!inClosedRange(toKey))
1693	>	throw new IllegalArgumentException("toKey out of range");
1694	>	return new AscendingSubMap(m,
1695	>	fromStart, lo,    loInclusive,
1696	>	false,     toKey, inclusive);
1697		}
1403	–	}
1698
1699	<	class EntryIterator extends PrivateEntryIterator<Map.Entry<K,V>> {
1700	<	EntryIterator(Entry<K,V> first) {
1701	<	super(first);
1702	<	}
1703	<	public Map.Entry<K,V> next() {
1704	<	return nextEntry();
1699	>	public NavigableMap<K,V> tailMap(K fromKey, boolean inclusive){
1700	>	if (!inRange(fromKey, inclusive))
1701	>	throw new IllegalArgumentException("fromKey out of range");
1702	>	return new AscendingSubMap(m,
1703	>	false, fromKey, inclusive,
1704	>	toEnd, hi,      hiInclusive);
1705		}
1412	–	}
1706
1707	<	class KeyIterator extends PrivateEntryIterator<K> {
1708	<	KeyIterator(Entry<K,V> first) {
1709	<	super(first);
1710	<	}
1711	<	public K next() {
1712	<	return nextEntry().key;
1707	>	public NavigableMap<K,V> descendingMap() {
1708	>	NavigableMap<K,V> mv = descendingMapView;
1709	>	return (mv != null) ? mv :
1710	>	(descendingMapView =
1711	>	new DescendingSubMap(m,
1712	>	fromStart, lo, loInclusive,
1713	>	toEnd,     hi, hiInclusive));
1714		}
1421	–	}
1715
1716	<	class ValueIterator extends PrivateEntryIterator<V> {
1717	<	ValueIterator(Entry<K,V> first) {
1425	<	super(first);
1716	>	Iterator<K> keyIterator() {
1717	>	return new SubMapKeyIterator(absLowest(), absHighFence());
1718		}
1427	–	public V next() {
1428	–	return nextEntry().value;
1429	–	}
1430	–	}
1719
1720	<	class SubMapEntryIterator extends PrivateEntryIterator<Map.Entry<K,V>> {
1721	<	private final K firstExcludedKey;
1434	<
1435	<	SubMapEntryIterator(Entry<K,V> first, Entry<K,V> firstExcluded) {
1436	<	super(first);
1437	<	firstExcludedKey = (firstExcluded == null
1438	<	? null
1439	<	: firstExcluded.key);
1720	>	Iterator<K> descendingKeyIterator() {
1721	>	return new DescendingSubMapKeyIterator(absHighest(), absLowFence());
1722		}
1723
1724	<	public boolean hasNext() {
1725	<	return next != null && next.key != firstExcludedKey;
1724	>	final class AscendingEntrySetView extends EntrySetView {
1725	>	public Iterator<Map.Entry<K,V>> iterator() {
1726	>	return new SubMapEntryIterator(absLowest(), absHighFence());
1727	>	}
1728		}
1729
1730	<	public Map.Entry<K,V> next() {
1731	<	if (next == null || next.key == firstExcludedKey)
1732	<	throw new NoSuchElementException();
1449	<	return nextEntry();
1730	>	public Set<Map.Entry<K,V>> entrySet() {
1731	>	EntrySetView es = entrySetView;
1732	>	return (es != null) ? es : new AscendingEntrySetView();
1733		}
1734	+
1735	+	TreeMap.Entry<K,V> subLowest()       { return absLowest(); }
1736	+	TreeMap.Entry<K,V> subHighest()      { return absHighest(); }
1737	+	TreeMap.Entry<K,V> subCeiling(K key) { return absCeiling(key); }
1738	+	TreeMap.Entry<K,V> subHigher(K key)  { return absHigher(key); }
1739	+	TreeMap.Entry<K,V> subFloor(K key)   { return absFloor(key); }
1740	+	TreeMap.Entry<K,V> subLower(K key)   { return absLower(key); }
1741		}
1742
1743		/**
1744	<	* Base for Descending Iterators.
1744	>	* @serial include
1745		*/
1746	<	abstract class DescendingPrivateEntryIterator<T> extends PrivateEntryIterator<T> {
1747	<	DescendingPrivateEntryIterator(Entry<K,V> first) {
1748	<	super(first);
1746	>	static final class DescendingSubMap<K,V>  extends NavigableSubMap<K,V> {
1747	>	private static final long serialVersionUID = 912986545866120460L;
1748	>	DescendingSubMap(TreeMap<K,V> m,
1749	>	boolean fromStart, K lo, boolean loInclusive,
1750	>	boolean toEnd,     K hi, boolean hiInclusive) {
1751	>	super(m, fromStart, lo, loInclusive, toEnd, hi, hiInclusive);
1752		}
1753
1754	<	Entry<K,V> nextEntry() {
1755	<	if (next == null)
1463	<	throw new NoSuchElementException();
1464	<	if (modCount != expectedModCount)
1465	<	throw new ConcurrentModificationException();
1466	<	lastReturned = next;
1467	<	next = predecessor(next);
1468	<	return lastReturned;
1469	<	}
1470	<	}
1754	>	private final Comparator<? super K> reverseComparator =
1755	>	Collections.reverseOrder(m.comparator);
1756
1757	<	class DescendingEntryIterator extends DescendingPrivateEntryIterator<Map.Entry<K,V>> {
1758	<	DescendingEntryIterator(Entry<K,V> first) {
1474	<	super(first);
1757	>	public Comparator<? super K> comparator() {
1758	>	return reverseComparator;
1759		}
1760	<	public Map.Entry<K,V> next() {
1761	<	return nextEntry();
1760	>
1761	>	public NavigableMap<K,V> subMap(K fromKey, boolean fromInclusive,
1762	>	K toKey,   boolean toInclusive) {
1763	>	if (!inRange(fromKey, fromInclusive))
1764	>	throw new IllegalArgumentException("fromKey out of range");
1765	>	if (!inRange(toKey, toInclusive))
1766	>	throw new IllegalArgumentException("toKey out of range");
1767	>	return new DescendingSubMap(m,
1768	>	false, toKey,   toInclusive,
1769	>	false, fromKey, fromInclusive);
1770		}
1479	–	}
1771
1772	<	class DescendingKeyIterator extends DescendingPrivateEntryIterator<K> {
1773	<	DescendingKeyIterator(Entry<K,V> first) {
1774	<	super(first);
1772	>	public NavigableMap<K,V> headMap(K toKey, boolean inclusive) {
1773	>	if (!inRange(toKey, inclusive))
1774	>	throw new IllegalArgumentException("toKey out of range");
1775	>	return new DescendingSubMap(m,
1776	>	false, toKey, inclusive,
1777	>	toEnd, hi,    hiInclusive);
1778		}
1779	<	public K next() {
1780	<	return nextEntry().key;
1779	>
1780	>	public NavigableMap<K,V> tailMap(K fromKey, boolean inclusive){
1781	>	if (!inRange(fromKey, inclusive))
1782	>	throw new IllegalArgumentException("fromKey out of range");
1783	>	return new DescendingSubMap(m,
1784	>	fromStart, lo, loInclusive,
1785	>	false, fromKey, inclusive);
1786		}
1488	–	}
1787
1788	+	public NavigableMap<K,V> descendingMap() {
1789	+	NavigableMap<K,V> mv = descendingMapView;
1790	+	return (mv != null) ? mv :
1791	+	(descendingMapView =
1792	+	new AscendingSubMap(m,
1793	+	fromStart, lo, loInclusive,
1794	+	toEnd,     hi, hiInclusive));
1795	+	}
1796
1797	<	class DescendingSubMapEntryIterator extends DescendingPrivateEntryIterator<Map.Entry<K,V>> {
1798	<	private final K lastExcludedKey;
1797	>	Iterator<K> keyIterator() {
1798	>	return new DescendingSubMapKeyIterator(absHighest(), absLowFence());
1799	>	}
1800
1801	<	DescendingSubMapEntryIterator(Entry<K,V> last, Entry<K,V> lastExcluded) {
1802	<	super(last);
1496	<	lastExcludedKey = (lastExcluded == null
1497	<	? null
1498	<	: lastExcluded.key);
1801	>	Iterator<K> descendingKeyIterator() {
1802	>	return new SubMapKeyIterator(absLowest(), absHighFence());
1803		}
1804
1805	<	public boolean hasNext() {
1806	<	return next != null && next.key != lastExcludedKey;
1805	>	final class DescendingEntrySetView extends EntrySetView {
1806	>	public Iterator<Map.Entry<K,V>> iterator() {
1807	>	return new DescendingSubMapEntryIterator(absHighest(), absLowFence());
1808	>	}
1809		}
1810
1811	<	public Map.Entry<K,V> next() {
1812	<	if (next == null || next.key == lastExcludedKey)
1813	<	throw new NoSuchElementException();
1508	<	return nextEntry();
1811	>	public Set<Map.Entry<K,V>> entrySet() {
1812	>	EntrySetView es = entrySetView;
1813	>	return (es != null) ? es : new DescendingEntrySetView();
1814		}
1815
1816	+	TreeMap.Entry<K,V> subLowest()       { return absHighest(); }
1817	+	TreeMap.Entry<K,V> subHighest()      { return absLowest(); }
1818	+	TreeMap.Entry<K,V> subCeiling(K key) { return absFloor(key); }
1819	+	TreeMap.Entry<K,V> subHigher(K key)  { return absLower(key); }
1820	+	TreeMap.Entry<K,V> subFloor(K key)   { return absCeiling(key); }
1821	+	TreeMap.Entry<K,V> subLower(K key)   { return absHigher(key); }
1822		}
1823
1824		/**
1825	<	* Compares two keys using the correct comparison method for this TreeMap.
1825	>	* This class exists solely for the sake of serialization
1826	>	* compatibility with previous releases of TreeMap that did not
1827	>	* support NavigableMap.  It translates an old-version SubMap into
1828	>	* a new-version AscendingSubMap. This class is never otherwise
1829	>	* used.
1830	>	*
1831	>	* @serial include
1832		*/
1833	<	private int compare(Object k1, Object k2) {
1834	<	return comparator==null ? ((Comparable<? super K>)k1).compareTo((K)k2)
1835	<	: comparator.compare((K)k1, (K)k2);
1833	>	private class SubMap extends AbstractMap<K,V>
1834	>	implements SortedMap<K,V>, java.io.Serializable {
1835	>	private static final long serialVersionUID = -6520786458950516097L;
1836	>	private boolean fromStart = false, toEnd = false;
1837	>	private K fromKey, toKey;
1838	>	private Object readResolve() {
1839	>	return new AscendingSubMap(TreeMap.this,
1840	>	fromStart, fromKey, true,
1841	>	toEnd, toKey, false);
1842	>	}
1843	>	public Set<Map.Entry<K,V>> entrySet() { throw new InternalError(); }
1844	>	public K lastKey() { throw new InternalError(); }
1845	>	public K firstKey() { throw new InternalError(); }
1846	>	public SortedMap<K,V> subMap(K fromKey, K toKey) { throw new InternalError(); }
1847	>	public SortedMap<K,V> headMap(K toKey) { throw new InternalError(); }
1848	>	public SortedMap<K,V> tailMap(K fromKey) { throw new InternalError(); }
1849	>	public Comparator<? super K> comparator() { throw new InternalError(); }
1850		}
1851
1852	<	/**
1853	<	* Test two values  for equality.  Differs from o1.equals(o2) only in
1523	<	* that it copes with <tt>null</tt> o1 properly.
1524	<	*/
1525	<	private static boolean valEquals(Object o1, Object o2) {
1526	<	return (o1==null ? o2==null : o1.equals(o2));
1527	<	}
1852	>
1853	>	// Red-black mechanics
1854
1855		private static final boolean RED   = false;
1856		private static final boolean BLACK = true;
#	Line 1534 | Line 1860 | public class TreeMap<K,V>
1860		* user (see Map.Entry).
1861		*/
1862
1863	<	static class Entry<K,V> implements Map.Entry<K,V> {
1863	>	static final class Entry<K,V> implements Map.Entry<K,V> {
1864		K key;
1865		V value;
1866		Entry<K,V> left = null;
#	Line 1586 | Line 1912 | public class TreeMap<K,V>
1912		public boolean equals(Object o) {
1913		if (!(o instanceof Map.Entry))
1914		return false;
1915	<	Map.Entry e = (Map.Entry)o;
1915	>	Map.Entry<?,?> e = (Map.Entry<?,?>)o;
1916
1917		return valEquals(key,e.getKey()) && valEquals(value,e.getValue());
1918		}
#	Line 1606 | Line 1932 | public class TreeMap<K,V>
1932		* Returns the first Entry in the TreeMap (according to the TreeMap's
1933		* key-sort function).  Returns null if the TreeMap is empty.
1934		*/
1935	<	private Entry<K,V> getFirstEntry() {
1935	>	final Entry<K,V> getFirstEntry() {
1936		Entry<K,V> p = root;
1937		if (p != null)
1938		while (p.left != null)
#	Line 1618 | Line 1944 | public class TreeMap<K,V>
1944		* Returns the last Entry in the TreeMap (according to the TreeMap's
1945		* key-sort function).  Returns null if the TreeMap is empty.
1946		*/
1947	<	private Entry<K,V> getLastEntry() {
1947	>	final Entry<K,V> getLastEntry() {
1948		Entry<K,V> p = root;
1949		if (p != null)
1950		while (p.right != null)
#	Line 1629 | Line 1955 | public class TreeMap<K,V>
1955		/**
1956		* Returns the successor of the specified Entry, or null if no such.
1957		*/
1958	<	private Entry<K,V> successor(Entry<K,V> t) {
1958	>	static <K,V> TreeMap.Entry<K,V> successor(Entry<K,V> t) {
1959		if (t == null)
1960		return null;
1961		else if (t.right != null) {
#	Line 1651 | Line 1977 | public class TreeMap<K,V>
1977		/**
1978		* Returns the predecessor of the specified Entry, or null if no such.
1979		*/
1980	<	private Entry<K,V> predecessor(Entry<K,V> t) {
1980	>	static <K,V> Entry<K,V> predecessor(Entry<K,V> t) {
1981		if (t == null)
1982		return null;
1983		else if (t.left != null) {
#	Line 1701 | Line 2027 | public class TreeMap<K,V>
2027		return (p == null) ? null: p.right;
2028		}
2029
2030	<	/** From CLR **/
2030	>	/** From CLR */
2031		private void rotateLeft(Entry<K,V> p) {
2032	<	Entry<K,V> r = p.right;
2033	<	p.right = r.left;
2034	<	if (r.left != null)
2035	<	r.left.parent = p;
2036	<	r.parent = p.parent;
2037	<	if (p.parent == null)
2038	<	root = r;
2039	<	else if (p.parent.left == p)
2040	<	p.parent.left = r;
2041	<	else
2042	<	p.parent.right = r;
2043	<	r.left = p;
2044	<	p.parent = r;
2032	>	if (p != null) {
2033	>	Entry<K,V> r = p.right;
2034	>	p.right = r.left;
2035	>	if (r.left != null)
2036	>	r.left.parent = p;
2037	>	r.parent = p.parent;
2038	>	if (p.parent == null)
2039	>	root = r;
2040	>	else if (p.parent.left == p)
2041	>	p.parent.left = r;
2042	>	else
2043	>	p.parent.right = r;
2044	>	r.left = p;
2045	>	p.parent = r;
2046	>	}
2047		}
2048
2049	<	/** From CLR **/
2049	>	/** From CLR */
2050		private void rotateRight(Entry<K,V> p) {
2051	<	Entry<K,V> l = p.left;
2052	<	p.left = l.right;
2053	<	if (l.right != null) l.right.parent = p;
2054	<	l.parent = p.parent;
2055	<	if (p.parent == null)
2056	<	root = l;
2057	<	else if (p.parent.right == p)
2058	<	p.parent.right = l;
2059	<	else p.parent.left = l;
2060	<	l.right = p;
2061	<	p.parent = l;
2051	>	if (p != null) {
2052	>	Entry<K,V> l = p.left;
2053	>	p.left = l.right;
2054	>	if (l.right != null) l.right.parent = p;
2055	>	l.parent = p.parent;
2056	>	if (p.parent == null)
2057	>	root = l;
2058	>	else if (p.parent.right == p)
2059	>	p.parent.right = l;
2060	>	else p.parent.left = l;
2061	>	l.right = p;
2062	>	p.parent = l;
2063	>	}
2064		}
2065
2066	<
1737	<	/** From CLR **/
2066	>	/** From CLR */
2067		private void fixAfterInsertion(Entry<K,V> x) {
2068		x.color = RED;
2069
#	Line 1753 | Line 2082 | public class TreeMap<K,V>
2082		}
2083		setColor(parentOf(x), BLACK);
2084		setColor(parentOf(parentOf(x)), RED);
2085	<	if (parentOf(parentOf(x)) != null)
1757	<	rotateRight(parentOf(parentOf(x)));
2085	>	rotateRight(parentOf(parentOf(x)));
2086		}
2087		} else {
2088		Entry<K,V> y = leftOf(parentOf(parentOf(x)));
#	Line 1768 | Line 2096 | public class TreeMap<K,V>
2096		x = parentOf(x);
2097		rotateRight(x);
2098		}
2099	<	setColor(parentOf(x),  BLACK);
2099	>	setColor(parentOf(x), BLACK);
2100		setColor(parentOf(parentOf(x)), RED);
2101	<	if (parentOf(parentOf(x)) != null)
1774	<	rotateLeft(parentOf(parentOf(x)));
2101	>	rotateLeft(parentOf(parentOf(x)));
2102		}
2103		}
2104		}
#	Line 1781 | Line 2108 | public class TreeMap<K,V>
2108		/**
2109		* Delete node p, and then rebalance the tree.
2110		*/
1784	–
2111		private void deleteEntry(Entry<K,V> p) {
2112	<	decrementSize();
2112	>	modCount++;
2113	>	size--;
2114
2115		// If strictly internal, copy successor's element to p and then make p
2116		// point to successor.
#	Line 1829 | Line 2156 | public class TreeMap<K,V>
2156		}
2157		}
2158
2159	<	/** From CLR **/
2159	>	/** From CLR */
2160		private void fixAfterDeletion(Entry<K,V> x) {
2161		while (x != root && colorOf(x) == BLACK) {
2162		if (x == leftOf(parentOf(x))) {
#	Line 1844 | Line 2171 | public class TreeMap<K,V>
2171
2172		if (colorOf(leftOf(sib))  == BLACK &&
2173		colorOf(rightOf(sib)) == BLACK) {
2174	<	setColor(sib,  RED);
2174	>	setColor(sib, RED);
2175		x = parentOf(x);
2176		} else {
2177		if (colorOf(rightOf(sib)) == BLACK) {
#	Line 1871 | Line 2198 | public class TreeMap<K,V>
2198
2199		if (colorOf(rightOf(sib)) == BLACK &&
2200		colorOf(leftOf(sib)) == BLACK) {
2201	<	setColor(sib,  RED);
2201	>	setColor(sib, RED);
2202		x = parentOf(x);
2203		} else {
2204		if (colorOf(leftOf(sib)) == BLACK) {
#	Line 1922 | Line 2249 | public class TreeMap<K,V>
2249		}
2250		}
2251
1925	–
1926	–
2252		/**
2253		* Reconstitute the <tt>TreeMap</tt> instance from a stream (i.e.,
2254		* deserialize it).
#	Line 1939 | Line 2264 | public class TreeMap<K,V>
2264		buildFromSorted(size, null, s, null);
2265		}
2266
2267	<	/** Intended to be called only from TreeSet.readObject **/
2267	>	/** Intended to be called only from TreeSet.readObject */
2268		void readTreeSet(int size, java.io.ObjectInputStream s, V defaultVal)
2269		throws java.io.IOException, ClassNotFoundException {
2270		buildFromSorted(size, null, s, defaultVal);
2271		}
2272
2273	<	/** Intended to be called only from TreeSet.addAll **/
2273	>	/** Intended to be called only from TreeSet.addAll */
2274		void addAllForTreeSet(SortedSet<? extends K> set, V defaultVal) {
2275		try {
2276		buildFromSorted(set.size(), set.iterator(), null, defaultVal);
#	Line 1985 | Line 2310 | public class TreeMap<K,V>
2310		* @throws ClassNotFoundException propagated from readObject.
2311		*         This cannot occur if str is null.
2312		*/
2313	<	private
2314	<	void buildFromSorted(int size, Iterator it,
2315	<	java.io.ObjectInputStream str,
1991	<	V defaultVal)
2313	>	private void buildFromSorted(int size, Iterator it,
2314	>	java.io.ObjectInputStream str,
2315	>	V defaultVal)
2316		throws  java.io.IOException, ClassNotFoundException {
2317		this.size = size;
2318	<	root =
2319	<	buildFromSorted(0, 0, size-1, computeRedLevel(size),
1996	<	it, str, defaultVal);
2318	>	root = buildFromSorted(0, 0, size-1, computeRedLevel(size),
2319	>	it, str, defaultVal);
2320		}
2321
2322		/**
2323		* Recursive "helper method" that does the real work of the
2324	<	* of the previous method.  Identically named parameters have
2324	>	* previous method.  Identically named parameters have
2325		* identical definitions.  Additional parameters are documented below.
2326		* It is assumed that the comparator and size fields of the TreeMap are
2327		* already set prior to calling this method.  (It ignores both fields.)

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