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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package jsr166x; |
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package jsr166x; |
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import java.util.*; |
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import java.util.concurrent.*; |
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* fields of underlying map, but enables this field to be declared |
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* final, which is necessary for thread safety. |
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*/ |
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private final ConcurrentSkipListMap<E,Object> m; |
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private final ConcurrentSkipListMap<E,Object> m; |
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/** |
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* Constructs a new, empty set, sorted according to the elements' natural |
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* order. |
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* order. |
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*/ |
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public ConcurrentSkipListSet() { |
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m = new ConcurrentSkipListMap<E,Object>(); |
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/** |
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* Constructs a new, empty set, sorted according to the specified |
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* comparator. |
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* comparator. |
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* |
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* @param c the comparator that will be used to sort this set. A |
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* <tt>null</tt> value indicates that the elements' <i>natural |
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* Constructs a new set containing the elements in the specified |
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* collection, sorted according to the elements' <i>natural order</i>. |
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* |
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* @param c The elements that will comprise the new set. |
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* @param c The elements that will comprise the new set |
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* |
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* @throws ClassCastException if the elements in the specified |
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* collection are not comparable, or are not mutually comparable. |
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* collection are not comparable, or are not mutually comparable |
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* @throws NullPointerException if the specified collection is |
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* <tt>null</tt>. |
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* <tt>null</tt> |
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*/ |
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public ConcurrentSkipListSet(Collection<? extends E> c) { |
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m = new ConcurrentSkipListMap<E,Object>(); |
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* Constructs a new set containing the same elements as the specified |
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* sorted set, sorted according to the same ordering. |
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* |
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* @param s sorted set whose elements will comprise the new set. |
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* @param s sorted set whose elements will comprise the new set |
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* @throws NullPointerException if the specified sorted set is |
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* <tt>null</tt>. |
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* <tt>null</tt> |
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*/ |
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public ConcurrentSkipListSet(SortedSet<E> s) { |
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m = new ConcurrentSkipListMap<E,Object>(s.comparator()); |
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* Returns a shallow copy of this set. (The elements themselves |
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* are not cloned.) |
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* |
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* @return a shallow copy of this set. |
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* @return a shallow copy of this set |
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*/ |
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public Object clone() { |
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ConcurrentSkipListSet<E> clone = null; |
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try { |
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clone = (ConcurrentSkipListSet<E>) super.clone(); |
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} catch (CloneNotSupportedException e) { |
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throw new InternalError(); |
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} |
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try { |
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clone = (ConcurrentSkipListSet<E>) super.clone(); |
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} catch (CloneNotSupportedException e) { |
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throw new InternalError(); |
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} |
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clone.m.initialize(); |
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clone.addAll(this); |
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* will be inaccurate. Thus, this method is typically not very |
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* useful in concurrent applications. |
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* |
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* @return the number of elements in this set. |
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* @return the number of elements in this set |
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*/ |
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public int size() { |
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return m.size(); |
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return m.size(); |
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} |
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/** |
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* Returns <tt>true</tt> if this set contains no elements. |
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* @return <tt>true</tt> if this set contains no elements. |
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* @return <tt>true</tt> if this set contains no elements |
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*/ |
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public boolean isEmpty() { |
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return m.isEmpty(); |
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return m.isEmpty(); |
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} |
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/** |
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* Returns <tt>true</tt> if this set contains the specified element. |
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* |
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* @param o the object to be checked for containment in this set. |
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* @return <tt>true</tt> if this set contains the specified element. |
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* @param o the object to be checked for containment in this set |
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* @return <tt>true</tt> if this set contains the specified element |
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* |
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* @throws ClassCastException if the specified object cannot be compared |
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* with the elements currently in the set. |
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* @throws NullPointerException if o is <tt>null</tt>. |
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* with the elements currently in the set |
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* @throws NullPointerException if o is <tt>null</tt> |
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*/ |
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public boolean contains(Object o) { |
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return m.containsKey(o); |
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return m.containsKey(o); |
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} |
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/** |
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* Adds the specified element to this set if it is not already present. |
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* |
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* @param o element to be added to this set. |
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* @param o element to be added to this set |
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* @return <tt>true</tt> if the set did not already contain the specified |
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* element. |
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* element |
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* |
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* @throws ClassCastException if the specified object cannot be compared |
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* with the elements currently in the set. |
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* @throws NullPointerException if o is <tt>null</tt>. |
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* with the elements currently in the set |
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* @throws NullPointerException if o is <tt>null</tt> |
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*/ |
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public boolean add(E o) { |
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return m.putIfAbsent(o, Boolean.TRUE) == null; |
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return m.putIfAbsent(o, Boolean.TRUE) == null; |
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} |
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/** |
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* Removes the specified element from this set if it is present. |
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* |
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* @param o object to be removed from this set, if present. |
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* @return <tt>true</tt> if the set contained the specified element. |
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* @param o object to be removed from this set, if present |
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* @return <tt>true</tt> if the set contained the specified element |
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* |
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* @throws ClassCastException if the specified object cannot be compared |
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* with the elements currently in the set. |
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* @throws NullPointerException if o is <tt>null</tt>. |
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* with the elements currently in the set |
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* @throws NullPointerException if o is <tt>null</tt> |
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*/ |
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public boolean remove(Object o) { |
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return m.removep(o); |
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return m.removep(o); |
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} |
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|
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/** |
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* Removes all of the elements from this set. |
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*/ |
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public void clear() { |
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m.clear(); |
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m.clear(); |
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} |
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/** |
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* Returns an iterator over the elements in this set. The elements |
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* are returned in ascending order. |
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* |
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* @return an iterator over the elements in this set. |
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* @return an iterator over the elements in this set |
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*/ |
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public Iterator<E> iterator() { |
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return m.keyIterator(); |
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return m.keyIterator(); |
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} |
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/** |
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* Returns an iterator over the elements in this set. The elements |
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* are returned in descending order. |
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* |
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* @return an iterator over the elements in this set. |
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* @return an iterator over the elements in this set |
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*/ |
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public Iterator<E> descendingIterator() { |
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return m.descendingKeyIterator(); |
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return m.descendingKeyIterator(); |
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} |
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|
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/* ---------------- AbstractSet Overrides -------------- */ |
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* equals method works properly across different implementations of the |
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* set interface. |
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* |
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* @param o Object to be compared for equality with this set. |
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* @return <tt>true</tt> if the specified Object is equal to this set. |
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* @param o Object to be compared for equality with this set |
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* @return <tt>true</tt> if the specified Object is equal to this set |
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*/ |
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public boolean equals(Object o) { |
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// Override AbstractSet version to avoid calling size() |
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if (o == this) |
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return true; |
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if (!(o instanceof Set)) |
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return false; |
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Collection c = (Collection) o; |
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if (o == this) |
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return true; |
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if (!(o instanceof Set)) |
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return false; |
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Collection c = (Collection) o; |
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try { |
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return containsAll(c) && c.containsAll(this); |
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< |
} catch(ClassCastException unused) { |
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> |
} catch (ClassCastException unused) { |
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return false; |
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< |
} catch(NullPointerException unused) { |
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> |
} catch (NullPointerException unused) { |
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return false; |
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} |
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} |
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> |
|
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/** |
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* Removes from this set all of its elements that are contained in |
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* the specified collection. If the specified collection is also |
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* value is the <i>asymmetric set difference</i> of the two sets. |
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* |
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* @param c collection that defines which elements will be removed from |
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* this set. |
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< |
* @return <tt>true</tt> if this set changed as a result of the call. |
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< |
* |
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> |
* this set |
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> |
* @return <tt>true</tt> if this set changed as a result of the call |
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> |
* |
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* @throws ClassCastException if the types of one or more elements in this |
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* set are incompatible with the specified collection |
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* @throws NullPointerException if the specified collection, or any |
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* of its elements are <tt>null</tt>. |
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* of its elements are <tt>null</tt> |
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*/ |
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public boolean removeAll(Collection<?> c) { |
| 279 |
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// Override AbstractSet version to avoid unnecessary call to size() |
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modified = true; |
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return modified; |
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} |
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< |
|
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> |
|
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/* ---------------- Relational operations -------------- */ |
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|
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/** |
| 290 |
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* Returns an element greater than or equal to the given element, or |
| 291 |
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* <tt>null</tt> if there is no such element. |
| 292 |
< |
* |
| 292 |
> |
* |
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* @param o the value to match |
| 294 |
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* @return an element greater than or equal to given element, or |
| 295 |
< |
* <tt>null</tt> if there is no such element. |
| 295 |
> |
* <tt>null</tt> if there is no such element |
| 296 |
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* @throws ClassCastException if o cannot be compared with the elements |
| 297 |
< |
* currently in the set. |
| 297 |
> |
* currently in the set |
| 298 |
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* @throws NullPointerException if o is <tt>null</tt> |
| 299 |
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*/ |
| 300 |
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public E ceiling(E o) { |
| 304 |
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/** |
| 305 |
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* Returns an element strictly less than the given element, or |
| 306 |
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* <tt>null</tt> if there is no such element. |
| 307 |
< |
* |
| 307 |
> |
* |
| 308 |
|
* @param o the value to match |
| 309 |
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* @return the greatest element less than the given element, or |
| 310 |
< |
* <tt>null</tt> if there is no such element. |
| 310 |
> |
* <tt>null</tt> if there is no such element |
| 311 |
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* @throws ClassCastException if o cannot be compared with the elements |
| 312 |
< |
* currently in the set. |
| 313 |
< |
* @throws NullPointerException if o is <tt>null</tt>. |
| 312 |
> |
* currently in the set |
| 313 |
> |
* @throws NullPointerException if o is <tt>null</tt> |
| 314 |
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*/ |
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public E lower(E o) { |
| 316 |
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return m.lowerKey(o); |
| 319 |
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/** |
| 320 |
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* Returns an element less than or equal to the given element, or |
| 321 |
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* <tt>null</tt> if there is no such element. |
| 322 |
< |
* |
| 322 |
> |
* |
| 323 |
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* @param o the value to match |
| 324 |
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* @return the greatest element less than or equal to given |
| 325 |
< |
* element, or <tt>null</tt> if there is no such element. |
| 325 |
> |
* element, or <tt>null</tt> if there is no such element |
| 326 |
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* @throws ClassCastException if o cannot be compared with the elements |
| 327 |
< |
* currently in the set. |
| 328 |
< |
* @throws NullPointerException if o is <tt>null</tt>. |
| 327 |
> |
* currently in the set |
| 328 |
> |
* @throws NullPointerException if o is <tt>null</tt> |
| 329 |
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*/ |
| 330 |
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public E floor(E o) { |
| 331 |
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return m.floorKey(o); |
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/** |
| 335 |
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* Returns an element strictly greater than the given element, or |
| 336 |
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* <tt>null</tt> if there is no such element. |
| 337 |
< |
* |
| 337 |
> |
* |
| 338 |
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* @param o the value to match |
| 339 |
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* @return the least element greater than the given element, or |
| 340 |
< |
* <tt>null</tt> if there is no such element. |
| 340 |
> |
* <tt>null</tt> if there is no such element |
| 341 |
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* @throws ClassCastException if o cannot be compared with the elements |
| 342 |
< |
* currently in the set. |
| 343 |
< |
* @throws NullPointerException if o is <tt>null</tt>. |
| 342 |
> |
* currently in the set |
| 343 |
> |
* @throws NullPointerException if o is <tt>null</tt> |
| 344 |
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*/ |
| 345 |
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public E higher(E o) { |
| 346 |
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return m.higherKey(o); |
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/** |
| 350 |
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* Retrieves and removes the first (lowest) element. |
| 351 |
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* |
| 352 |
< |
* @return the least element, or <tt>null</tt> if empty. |
| 352 |
> |
* @return the least element, or <tt>null</tt> if empty |
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*/ |
| 354 |
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public E pollFirst() { |
| 355 |
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return m.pollFirstKey(); |
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/** |
| 359 |
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* Retrieves and removes the last (highest) element. |
| 360 |
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* |
| 361 |
< |
* @return the last element, or <tt>null</tt> if empty. |
| 361 |
> |
* @return the last element, or <tt>null</tt> if empty |
| 362 |
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*/ |
| 363 |
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public E pollLast() { |
| 364 |
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return m.pollLastKey(); |
| 373 |
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* if this set uses its elements natural ordering. |
| 374 |
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* |
| 375 |
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* @return the comparator used to order this set, or <tt>null</tt> |
| 376 |
< |
* if this set uses its elements natural ordering. |
| 376 |
> |
* if this set uses its elements natural ordering |
| 377 |
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*/ |
| 378 |
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public Comparator<? super E> comparator() { |
| 379 |
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return m.comparator(); |
| 382 |
|
/** |
| 383 |
|
* Returns the first (lowest) element currently in this set. |
| 384 |
|
* |
| 385 |
< |
* @return the first (lowest) element currently in this set. |
| 386 |
< |
* @throws NoSuchElementException sorted set is empty. |
| 385 |
> |
* @return the first (lowest) element currently in this set |
| 386 |
> |
* @throws NoSuchElementException sorted set is empty |
| 387 |
|
*/ |
| 388 |
|
public E first() { |
| 389 |
|
return m.firstKey(); |
| 392 |
|
/** |
| 393 |
|
* Returns the last (highest) element currently in this set. |
| 394 |
|
* |
| 395 |
< |
* @return the last (highest) element currently in this set. |
| 396 |
< |
* @throws NoSuchElementException sorted set is empty. |
| 395 |
> |
* @return the last (highest) element currently in this set |
| 396 |
> |
* @throws NoSuchElementException sorted set is empty |
| 397 |
|
*/ |
| 398 |
|
public E last() { |
| 399 |
|
return m.lastKey(); |
| 407 |
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* <tt>fromElement</tt> and <tt>toElement</tt> are equal, the returned |
| 408 |
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* sorted set is empty.) The returned sorted set is backed by this set, |
| 409 |
|
* so changes in the returned sorted set are reflected in this set, and |
| 410 |
< |
* vice-versa. |
| 411 |
< |
* @param fromElement low endpoint (inclusive) of the subSet. |
| 412 |
< |
* @param toElement high endpoint (exclusive) of the subSet. |
| 410 |
> |
* vice-versa. |
| 411 |
> |
* @param fromElement low endpoint (inclusive) of the subSet |
| 412 |
> |
* @param toElement high endpoint (exclusive) of the subSet |
| 413 |
|
* @return a view of the portion of this set whose elements range from |
| 414 |
< |
* <tt>fromElement</tt>, inclusive, to <tt>toElement</tt>, |
| 415 |
< |
* exclusive. |
| 414 |
> |
* <tt>fromElement</tt>, inclusive, to <tt>toElement</tt>, |
| 415 |
> |
* exclusive |
| 416 |
|
* @throws ClassCastException if <tt>fromElement</tt> and |
| 417 |
|
* <tt>toElement</tt> cannot be compared to one another using |
| 418 |
|
* this set's comparator (or, if the set has no comparator, |
| 419 |
< |
* using natural ordering). |
| 419 |
> |
* using natural ordering) |
| 420 |
|
* @throws IllegalArgumentException if <tt>fromElement</tt> is |
| 421 |
< |
* greater than <tt>toElement</tt>. |
| 421 |
> |
* greater than <tt>toElement</tt> |
| 422 |
|
* @throws NullPointerException if <tt>fromElement</tt> or |
| 423 |
< |
* <tt>toElement</tt> is <tt>null</tt>. |
| 423 |
> |
* <tt>toElement</tt> is <tt>null</tt> |
| 424 |
|
*/ |
| 425 |
|
public NavigableSet<E> subSet(E fromElement, E toElement) { |
| 426 |
< |
return new ConcurrentSkipListSubSet<E>(m, fromElement, toElement); |
| 426 |
> |
return new ConcurrentSkipListSubSet<E>(m, fromElement, toElement); |
| 427 |
|
} |
| 428 |
|
|
| 429 |
|
/** |
| 430 |
|
* Returns a view of the portion of this set whose elements are strictly |
| 431 |
|
* less than <tt>toElement</tt>. The returned sorted set is backed by |
| 432 |
|
* this set, so changes in the returned sorted set are reflected in this |
| 433 |
< |
* set, and vice-versa. |
| 434 |
< |
* @param toElement high endpoint (exclusive) of the headSet. |
| 433 |
> |
* set, and vice-versa. |
| 434 |
> |
* @param toElement high endpoint (exclusive) of the headSet |
| 435 |
|
* @return a view of the portion of this set whose elements are strictly |
| 436 |
< |
* less than toElement. |
| 436 |
> |
* less than toElement |
| 437 |
|
* @throws ClassCastException if <tt>toElement</tt> is not compatible |
| 438 |
|
* with this set's comparator (or, if the set has no comparator, |
| 439 |
< |
* if <tt>toElement</tt> does not implement <tt>Comparable</tt>). |
| 440 |
< |
* @throws NullPointerException if <tt>toElement</tt> is <tt>null</tt>. |
| 439 |
> |
* if <tt>toElement</tt> does not implement <tt>Comparable</tt>) |
| 440 |
> |
* @throws NullPointerException if <tt>toElement</tt> is <tt>null</tt> |
| 441 |
|
*/ |
| 442 |
|
public NavigableSet<E> headSet(E toElement) { |
| 443 |
< |
return new ConcurrentSkipListSubSet<E>(m, null, toElement); |
| 443 |
> |
return new ConcurrentSkipListSubSet<E>(m, null, toElement); |
| 444 |
|
} |
| 445 |
|
|
| 446 |
|
|
| 449 |
|
* greater than or equal to <tt>fromElement</tt>. The returned |
| 450 |
|
* sorted set is backed by this set, so changes in the returned |
| 451 |
|
* sorted set are reflected in this set, and vice-versa. |
| 452 |
< |
* @param fromElement low endpoint (inclusive) of the tailSet. |
| 452 |
> |
* @param fromElement low endpoint (inclusive) of the tailSet |
| 453 |
|
* @return a view of the portion of this set whose elements are |
| 454 |
< |
* greater than or equal to <tt>fromElement</tt>. |
| 454 |
> |
* greater than or equal to <tt>fromElement</tt> |
| 455 |
|
* @throws ClassCastException if <tt>fromElement</tt> is not |
| 456 |
|
* compatible with this set's comparator (or, if the set has no |
| 457 |
|
* comparator, if <tt>fromElement</tt> does not implement |
| 458 |
< |
* <tt>Comparable</tt>). |
| 459 |
< |
* @throws NullPointerException if <tt>fromElement</tt> is <tt>null</tt>. |
| 458 |
> |
* <tt>Comparable</tt>) |
| 459 |
> |
* @throws NullPointerException if <tt>fromElement</tt> is <tt>null</tt> |
| 460 |
|
*/ |
| 461 |
|
public NavigableSet<E> tailSet(E fromElement) { |
| 462 |
< |
return new ConcurrentSkipListSubSet<E>(m, fromElement, null); |
| 462 |
> |
return new ConcurrentSkipListSubSet<E>(m, fromElement, null); |
| 463 |
|
} |
| 464 |
|
|
| 465 |
|
/** |
| 471 |
|
* in {@link IllegalArgumentException}. Instances of this class are |
| 472 |
|
* constructed only using the <tt>subSet</tt>, <tt>headSet</tt>, and |
| 473 |
|
* <tt>tailSet</tt> methods of their underlying sets. |
| 474 |
– |
* |
| 474 |
|
*/ |
| 475 |
< |
static class ConcurrentSkipListSubSet<E> |
| 476 |
< |
extends AbstractSet<E> |
| 475 |
> |
static class ConcurrentSkipListSubSet<E> |
| 476 |
> |
extends AbstractSet<E> |
| 477 |
|
implements NavigableSet<E>, java.io.Serializable { |
| 478 |
|
|
| 479 |
|
private static final long serialVersionUID = -7647078645896651609L; |
| 480 |
|
|
| 481 |
|
/** The underlying submap */ |
| 482 |
|
private final ConcurrentSkipListMap.ConcurrentSkipListSubMap<E,Object> s; |
| 483 |
< |
|
| 483 |
> |
|
| 484 |
|
/** |
| 485 |
< |
* Creates a new submap. |
| 485 |
> |
* Creates a new submap. |
| 486 |
|
* @param fromElement inclusive least value, or <tt>null</tt> if from start |
| 487 |
|
* @param toElement exclusive upper bound or <tt>null</tt> if to end |
| 488 |
|
* @throws IllegalArgumentException if fromElement and toElement |
| 489 |
< |
* nonnull and fromElement greater than toElement |
| 489 |
> |
* non-null and fromElement greater than toElement |
| 490 |
|
*/ |
| 491 |
< |
ConcurrentSkipListSubSet(ConcurrentSkipListMap<E,Object> map, |
| 491 |
> |
ConcurrentSkipListSubSet(ConcurrentSkipListMap<E,Object> map, |
| 492 |
|
E fromElement, E toElement) { |
| 493 |
|
s = new ConcurrentSkipListMap.ConcurrentSkipListSubMap<E,Object> |
| 494 |
|
(map, fromElement, toElement); |
| 499 |
|
public NavigableSet<E> subSet(E fromElement, E toElement) { |
| 500 |
|
if (!s.inOpenRange(fromElement) || !s.inOpenRange(toElement)) |
| 501 |
|
throw new IllegalArgumentException("element out of range"); |
| 502 |
< |
return new ConcurrentSkipListSubSet<E>(s.getMap(), |
| 502 |
> |
return new ConcurrentSkipListSubSet<E>(s.getMap(), |
| 503 |
|
fromElement, toElement); |
| 504 |
|
} |
| 505 |
|
|
| 507 |
|
E least = s.getLeast(); |
| 508 |
|
if (!s.inOpenRange(toElement)) |
| 509 |
|
throw new IllegalArgumentException("element out of range"); |
| 510 |
< |
return new ConcurrentSkipListSubSet<E>(s.getMap(), |
| 510 |
> |
return new ConcurrentSkipListSubSet<E>(s.getMap(), |
| 511 |
|
least, toElement); |
| 512 |
|
} |
| 513 |
< |
|
| 513 |
> |
|
| 514 |
|
public NavigableSet<E> tailSet(E fromElement) { |
| 515 |
|
E fence = s.getFence(); |
| 516 |
|
if (!s.inOpenRange(fromElement)) |
| 517 |
|
throw new IllegalArgumentException("element out of range"); |
| 518 |
< |
return new ConcurrentSkipListSubSet<E>(s.getMap(), |
| 518 |
> |
return new ConcurrentSkipListSubSet<E>(s.getMap(), |
| 519 |
|
fromElement, fence); |
| 520 |
|
} |
| 521 |
|
|
| 538 |
|
public Iterator<E> descendingIterator() { |
| 539 |
|
return s.descendingKeySet().iterator(); |
| 540 |
|
} |
| 541 |
< |
public E pollFirst() { |
| 541 |
> |
public E pollFirst() { |
| 542 |
|
Map.Entry<E,?> e = s.pollFirstEntry(); |
| 543 |
< |
return (e == null)? null : e.getKey(); |
| 543 |
> |
return (e == null) ? null : e.getKey(); |
| 544 |
|
} |
| 545 |
|
public E pollLast() { |
| 546 |
|
Map.Entry<E,?> e = s.pollLastEntry(); |
| 547 |
< |
return (e == null)? null : e.getKey(); |
| 547 |
> |
return (e == null) ? null : e.getKey(); |
| 548 |
|
} |
| 549 |
|
|
| 550 |
|
} |
| 551 |
< |
} |
| 551 |
> |
} |
