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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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* Written by Doug Lea and Josh Bloch with assistance from members of JCP |
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* JSR-166 Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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/** |
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* A {@link SortedMap} extended with navigation methods returning the |
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* closest matches for given search targets. Methods |
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* <tt>lowerEntry</tt>, <tt>floorEntry</tt>, <tt>ceilingEntry</tt>, |
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* and <tt>higherEntry</tt> return <tt>Map.Entry</tt> objects |
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* {@code lowerEntry}, {@code floorEntry}, {@code ceilingEntry}, |
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* and {@code higherEntry} return {@code Map.Entry} objects |
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* associated with keys respectively less than, less than or equal, |
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* greater than or equal, and greater than a given key, returning |
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* <tt>null</tt> if there is no such key. Similarly, methods |
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* <tt>lowerKey</tt>, <tt>floorKey</tt>, <tt>ceilingKey</tt>, and |
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* <tt>higherKey</tt> return only the associated keys. All of these |
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* {@code null} if there is no such key. Similarly, methods |
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* {@code lowerKey}, {@code floorKey}, {@code ceilingKey}, and |
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* {@code higherKey} return only the associated keys. All of these |
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* methods are designed for locating, not traversing entries. |
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* |
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* <p>A <tt>NavigableMap</tt> may be viewed and traversed in either |
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* ascending or descending key order. The <tt>Map</tt> methods |
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* <tt>keySet</tt> and <tt>entrySet</tt> return ascending views, and |
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* the additional methods <tt>descendingKeySet</tt> and |
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* <tt>descendingEntrySet</tt> return descending views. The |
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* performance of ascending traversals is likely to be faster than |
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* descending traversals. Notice that it is possible to perform |
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* subrange traversals in either direction using <tt>navigableSubMap</tt>. |
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* Methods <tt>navigableSubMap</tt>, <tt>navigableHeadMap</tt>, and |
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* <tt>navigableTailMap</tt> differ from the similarly named |
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* <tt>SortedMap</tt> methods only in that the returned maps |
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* are guaranteed to obey the <tt>NavigableMap</tt> interface. |
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* <p>A {@code NavigableMap} may be accessed and traversed in either |
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* ascending or descending key order. The {@code descendingMap} |
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* method returns a view of the map with the senses of all relational |
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* and directional methods inverted. The performance of ascending |
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* operations and views is likely to be faster than that of descending |
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* ones. Methods {@code subMap}, {@code headMap}, |
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* and {@code tailMap} differ from the like-named {@code |
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* SortedMap} methods in accepting additional arguments describing |
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* whether lower and upper bounds are inclusive versus exclusive. |
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* Submaps of any {@code NavigableMap} must implement the {@code |
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* NavigableMap} interface. |
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* |
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* <p>This interface additionally defines methods <tt>firstEntry</tt>, |
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* <tt>pollFirstEntry</tt>, <tt>lastEntry</tt>, and |
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* <tt>pollLastEntry</tt> that return and/or remove the least and |
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* greatest mappings, if any exist, else returning <tt>null</tt>. |
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* <p>This interface additionally defines methods {@code firstEntry}, |
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* {@code pollFirstEntry}, {@code lastEntry}, and |
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* {@code pollLastEntry} that return and/or remove the least and |
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* greatest mappings, if any exist, else returning {@code null}. |
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* |
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* <p> Implementations of entry-returning methods are expected to |
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* return <tt>Map.Entry</tt> pairs representing snapshots of mappings |
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* return {@code Map.Entry} pairs representing snapshots of mappings |
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* at the time they were produced, and thus generally do <em>not</em> |
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* support the optional <tt>Entry.setValue</tt> method. Note however |
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* support the optional {@code Entry.setValue} method. Note however |
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* that it is possible to change mappings in the associated map using |
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* method <tt>put</tt>. |
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* method {@code put}. |
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* |
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* <p>This interface is a member of the |
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* <a href="{@docRoot}/../guide/collections/index.html"> |
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* Java Collections Framework</a>. |
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* |
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* @author Doug Lea |
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* @author Josh Bloch |
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* @param <K> the type of keys maintained by this map |
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* @param <V> the type of mapped values |
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* @since 1.6 |
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public interface NavigableMap<K,V> extends SortedMap<K,V> { |
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/** |
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* Returns a key-value mapping associated with the greatest key |
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* strictly less than the given key, or <tt>null</tt> if there is |
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* strictly less than the given key, or {@code null} if there is |
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* no such key. |
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* |
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* @param key the key |
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* @return an entry with the greatest key less than <tt>key</tt>, |
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* or <tt>null</tt> if there is no such key |
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* @return an entry with the greatest key less than {@code key}, |
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* or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns the greatest key strictly less than the given key, or |
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* <tt>null</tt> if there is no such key. |
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* {@code null} if there is no such key. |
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* |
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* @param key the key |
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* @return the greatest key less than <tt>key</tt>, |
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* or <tt>null</tt> if there is no such key |
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* @return the greatest key less than {@code key}, |
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* or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns a key-value mapping associated with the greatest key |
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* less than or equal to the given key, or <tt>null</tt> if there |
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* less than or equal to the given key, or {@code null} if there |
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* is no such key. |
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* |
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* @param key the key |
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* @return an entry with the greatest key less than or equal to |
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* <tt>key</tt>, or <tt>null</tt> if there is no such key |
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* {@code key}, or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns the greatest key less than or equal to the given key, |
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* or <tt>null</tt> if there is no such key. |
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* or {@code null} if there is no such key. |
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* |
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* @param key the key |
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* @return the greatest key less than or equal to <tt>key</tt>, |
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* or <tt>null</tt> if there is no such key |
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* @return the greatest key less than or equal to {@code key}, |
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* or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns a key-value mapping associated with the least key |
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* greater than or equal to the given key, or <tt>null</tt> if |
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* greater than or equal to the given key, or {@code null} if |
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* there is no such key. |
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* |
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* @param key the key |
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* @return an entry with the least key greater than or equal to |
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* <tt>key</tt>, or <tt>null</tt> if there is no such key |
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* {@code key}, or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns the least key greater than or equal to the given key, |
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* or <tt>null</tt> if there is no such key. |
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* or {@code null} if there is no such key. |
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* |
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* @param key the key |
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* @return the least key greater than or equal to <tt>key</tt>, |
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* or <tt>null</tt> if there is no such key |
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* @return the least key greater than or equal to {@code key}, |
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* or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns a key-value mapping associated with the least key |
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* strictly greater than the given key, or <tt>null</tt> if there |
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* strictly greater than the given key, or {@code null} if there |
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* is no such key. |
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* |
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* @param key the key |
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* @return an entry with the least key greater than <tt>key</tt>, |
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* or <tt>null</tt> if there is no such key |
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* @return an entry with the least key greater than {@code key}, |
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* or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns the least key strictly greater than the given key, or |
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* <tt>null</tt> if there is no such key. |
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* {@code null} if there is no such key. |
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* |
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* @param key the key |
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* @return the least key greater than <tt>key</tt>, |
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* or <tt>null</tt> if there is no such key |
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* @return the least key greater than {@code key}, |
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* or {@code null} if there is no such key |
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* @throws ClassCastException if the specified key cannot be compared |
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* with the keys currently in the map |
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* @throws NullPointerException if the specified key is null |
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|
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/** |
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* Returns a key-value mapping associated with the least |
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* key in this map, or <tt>null</tt> if the map is empty. |
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* key in this map, or {@code null} if the map is empty. |
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* |
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* @return an entry with the least key, |
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* or <tt>null</tt> if this map is empty |
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* or {@code null} if this map is empty |
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*/ |
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Map.Entry<K,V> firstEntry(); |
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|
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/** |
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* Returns a key-value mapping associated with the greatest |
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* key in this map, or <tt>null</tt> if the map is empty. |
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* key in this map, or {@code null} if the map is empty. |
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* |
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* @return an entry with the greatest key, |
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* or <tt>null</tt> if this map is empty |
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* or {@code null} if this map is empty |
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*/ |
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Map.Entry<K,V> lastEntry(); |
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|
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/** |
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* Removes and returns a key-value mapping associated with |
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* the least key in this map, or <tt>null</tt> if the map is empty. |
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* the least key in this map, or {@code null} if the map is empty. |
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* |
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* @return the removed first entry of this map, |
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* or <tt>null</tt> if this map is empty |
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* or {@code null} if this map is empty |
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*/ |
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Map.Entry<K,V> pollFirstEntry(); |
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|
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/** |
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* Removes and returns a key-value mapping associated with |
201 |
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* the greatest key in this map, or <tt>null</tt> if the map is empty. |
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* the greatest key in this map, or {@code null} if the map is empty. |
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* |
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* @return the removed last entry of this map, |
204 |
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* or <tt>null</tt> if this map is empty |
204 |
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* or {@code null} if this map is empty |
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*/ |
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Map.Entry<K,V> pollLastEntry(); |
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|
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/** |
209 |
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* Returns a {@link Set} view of the keys contained in this map. |
209 |
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* Returns a {@link NavigableMap} view of the mappings contained in this |
210 |
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* map in descending order. The descending map is backed by this map, so |
211 |
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* changes to the map are reflected in the descending set, and vice-versa. |
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* If either map is modified while an iteration over a collection view of |
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* the other map is in progress (except through the iterator's own |
214 |
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* {@code remove} operation), the results of the iteration are undefined. |
215 |
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* |
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* @return a navigable map view of the mappings contained in this map, |
217 |
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* sorted in descending order |
218 |
> |
*/ |
219 |
> |
NavigableMap<K,V> descendingMap(); |
220 |
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|
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/** |
222 |
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* Returns a navigable set view of the keys contained in this navigable |
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* map. The set is backed by the map, so changes to the map are reflected |
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* in the set, and vice-versa. If the map is modified while an iteration |
225 |
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* over the set is in progress (except through the iterator's own |
226 |
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* {@code remove} operation), the results of the iteration are undefined. |
227 |
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* The set supports element removal, which removes the corresponding |
228 |
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* mapping from the map, via the {@code Iterator.remove}, |
229 |
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* {@code Set.remove}, {@code removeAll} {@code retainAll}, and |
230 |
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* {@code clear} operations. It does not support the {@code add} or |
231 |
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* {@code addAll} operations. |
232 |
> |
* |
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> |
* @return a navigable set view of the keys contained in this navigable map |
234 |
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*/ |
235 |
> |
NavigableSet<K> navigableKeySet(); |
236 |
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|
237 |
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/** |
238 |
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* Returns a {@link NavigableSet} view of the keys contained in this map. |
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* The set's iterator returns the keys in descending order. |
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* The set is backed by the map, so changes to the map are |
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* reflected in the set, and vice-versa. If the map is modified |
251 |
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* @return a set view of the keys contained in this map, sorted in |
252 |
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* descending order |
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*/ |
254 |
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Set<K> descendingKeySet(); |
226 |
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|
227 |
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/** |
228 |
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* Returns a {@link Set} view of the mappings contained in this map. |
229 |
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* The set's iterator returns the entries in descending key order. |
230 |
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* The set is backed by the map, so changes to the map are |
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* reflected in the set, and vice-versa. If the map is modified |
232 |
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* while an iteration over the set is in progress (except through |
233 |
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* the iterator's own <tt>remove</tt> operation, or through the |
234 |
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* <tt>setValue</tt> operation on a map entry returned by the |
235 |
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* iterator) the results of the iteration are undefined. The set |
236 |
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* supports element removal, which removes the corresponding |
237 |
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* mapping from the map, via the <tt>Iterator.remove</tt>, |
238 |
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* <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt> and |
239 |
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* <tt>clear</tt> operations. It does not support the |
240 |
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* <tt>add</tt> or <tt>addAll</tt> operations. |
241 |
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* |
242 |
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* @return a set view of the mappings contained in this map, |
243 |
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* sorted in descending key order |
244 |
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*/ |
245 |
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Set<Map.Entry<K, V>> descendingEntrySet(); |
254 |
> |
NavigableSet<K> descendingKeySet(); |
255 |
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|
256 |
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/** |
257 |
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* Returns a view of the portion of this map whose keys range from |
258 |
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* <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive. (If |
259 |
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* <tt>fromKey</tt> and <tt>toKey</tt> are equal, the returned map |
260 |
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* is empty.) The returned map is backed by this map, so changes |
261 |
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* in the returned map are reflected in this map, and vice-versa. |
262 |
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* The returned map supports all optional map operations that this |
263 |
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* map supports. |
255 |
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* |
256 |
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* <p>The returned map will throw an <tt>IllegalArgumentException</tt> |
257 |
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* on an attempt to insert a key outside its range. |
258 |
> |
* {@code fromKey} to {@code toKey}. If {@code fromKey} and |
259 |
> |
* {@code toKey} are equal, the returned map is empty unless |
260 |
> |
* {@code fromExclusive} and {@code toExclusive} are both true. The |
261 |
> |
* returned map is backed by this map, so changes in the returned map are |
262 |
> |
* reflected in this map, and vice-versa. The returned map supports all |
263 |
> |
* optional map operations that this map supports. |
264 |
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* |
265 |
< |
* @param fromKey low endpoint (inclusive) of the keys in the returned map |
266 |
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* @param toKey high endpoint (exclusive) of the keys in the returned map |
265 |
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* <p>The returned map will throw an {@code IllegalArgumentException} |
266 |
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* on an attempt to insert a key outside of its range, or to construct a |
267 |
> |
* submap either of whose endpoints lie outside its range. |
268 |
> |
* |
269 |
> |
* @param fromKey low endpoint of the keys in the returned map |
270 |
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* @param fromInclusive true if the low endpoint ({@code fromKey}) is |
271 |
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* to be included in the the returned view |
272 |
> |
* @param toKey high endpoint of the keys in the returned map |
273 |
> |
* @param toInclusive true if the high endpoint ({@code toKey}) is |
274 |
> |
* to be included in the the returned view |
275 |
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* @return a view of the portion of this map whose keys range from |
276 |
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* <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive |
277 |
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* @throws ClassCastException if <tt>fromKey</tt> and <tt>toKey</tt> |
276 |
> |
* {@code fromKey} to {@code toKey} |
277 |
> |
* @throws ClassCastException if {@code fromKey} and {@code toKey} |
278 |
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* cannot be compared to one another using this map's comparator |
279 |
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* (or, if the map has no comparator, using natural ordering). |
280 |
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* Implementations may, but are not required to, throw this |
281 |
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* exception if <tt>fromKey</tt> or <tt>toKey</tt> |
281 |
> |
* exception if {@code fromKey} or {@code toKey} |
282 |
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* cannot be compared to keys currently in the map. |
283 |
< |
* @throws NullPointerException if <tt>fromKey</tt> or <tt>toKey</tt> |
283 |
> |
* @throws NullPointerException if {@code fromKey} or {@code toKey} |
284 |
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* is null and this map does not permit null keys |
285 |
< |
* @throws IllegalArgumentException if <tt>fromKey</tt> is greater than |
286 |
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* <tt>toKey</tt>; or if this map itself has a restricted |
287 |
< |
* range, and <tt>fromKey</tt> or <tt>toKey</tt> lies |
285 |
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* @throws IllegalArgumentException if {@code fromKey} is greater than |
286 |
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* {@code toKey}; or if this map itself has a restricted |
287 |
> |
* range, and {@code fromKey} or {@code toKey} lies |
288 |
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* outside the bounds of the range |
289 |
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*/ |
290 |
< |
NavigableMap<K,V> navigableSubMap(K fromKey, K toKey); |
290 |
> |
NavigableMap<K,V> subMap(K fromKey, boolean fromInclusive, |
291 |
> |
K toKey, boolean toInclusive); |
292 |
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|
293 |
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/** |
294 |
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* Returns a view of the portion of this map whose keys are |
295 |
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* strictly less than <tt>toKey</tt>. The returned map is backed |
296 |
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* by this map, so changes in the returned map are reflected in |
297 |
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* this map, and vice-versa. The returned map supports all |
298 |
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* optional map operations that this map supports. |
294 |
> |
* Returns a view of the portion of this map whose keys are less than (or |
295 |
> |
* equal to, if {@code inclusive} is true) {@code toKey}. The returned |
296 |
> |
* map is backed by this map, so changes in the returned map are reflected |
297 |
> |
* in this map, and vice-versa. The returned map supports all optional |
298 |
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* map operations that this map supports. |
299 |
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* |
300 |
< |
* <p>The returned map will throw an <tt>IllegalArgumentException</tt> |
300 |
> |
* <p>The returned map will throw an {@code IllegalArgumentException} |
301 |
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* on an attempt to insert a key outside its range. |
302 |
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* |
303 |
< |
* @param toKey high endpoint (exclusive) of the keys in the returned map |
304 |
< |
* @return a view of the portion of this map whose keys are strictly |
305 |
< |
* less than <tt>toKey</tt> |
306 |
< |
* @throws ClassCastException if <tt>toKey</tt> is not compatible |
303 |
> |
* @param toKey high endpoint of the keys in the returned map |
304 |
> |
* @param inclusive true if the high endpoint ({@code toKey}) is |
305 |
> |
* to be included in the the returned view |
306 |
> |
* @return a view of the portion of this map whose keys are less than |
307 |
> |
* (or equal to, if {@code inclusive} is true) {@code toKey} |
308 |
> |
* @throws ClassCastException if {@code toKey} is not compatible |
309 |
|
* with this map's comparator (or, if the map has no comparator, |
310 |
< |
* if <tt>toKey</tt> does not implement {@link Comparable}). |
310 |
> |
* if {@code toKey} does not implement {@link Comparable}). |
311 |
|
* Implementations may, but are not required to, throw this |
312 |
< |
* exception if <tt>toKey</tt> cannot be compared to keys |
312 |
> |
* exception if {@code toKey} cannot be compared to keys |
313 |
|
* currently in the map. |
314 |
< |
* @throws NullPointerException if <tt>toKey</tt> is null |
314 |
> |
* @throws NullPointerException if {@code toKey} is null |
315 |
|
* and this map does not permit null keys |
316 |
|
* @throws IllegalArgumentException if this map itself has a |
317 |
< |
* restricted range, and <tt>toKey</tt> lies outside the |
317 |
> |
* restricted range, and {@code toKey} lies outside the |
318 |
|
* bounds of the range |
319 |
|
*/ |
320 |
< |
NavigableMap<K,V> navigableHeadMap(K toKey); |
320 |
> |
NavigableMap<K,V> headMap(K toKey, boolean inclusive); |
321 |
|
|
322 |
|
/** |
323 |
< |
* Returns a view of the portion of this map whose keys are |
324 |
< |
* greater than or equal to <tt>fromKey</tt>. The returned map is |
325 |
< |
* backed by this map, so changes in the returned map are |
326 |
< |
* reflected in this map, and vice-versa. The returned map |
327 |
< |
* supports all optional map operations that this map supports. |
323 |
> |
* Returns a view of the portion of this map whose keys are greater than (or |
324 |
> |
* equal to, if {@code inclusive} is true) {@code fromKey}. The returned |
325 |
> |
* map is backed by this map, so changes in the returned map are reflected |
326 |
> |
* in this map, and vice-versa. The returned map supports all optional |
327 |
> |
* map operations that this map supports. |
328 |
|
* |
329 |
< |
* <p>The returned map will throw an <tt>IllegalArgumentException</tt> |
329 |
> |
* <p>The returned map will throw an {@code IllegalArgumentException} |
330 |
|
* on an attempt to insert a key outside its range. |
331 |
|
* |
332 |
< |
* @param fromKey low endpoint (inclusive) of the keys in the returned map |
333 |
< |
* @return a view of the portion of this map whose keys are greater |
334 |
< |
* than or equal to <tt>fromKey</tt> |
335 |
< |
* @throws ClassCastException if <tt>fromKey</tt> is not compatible |
332 |
> |
* @param fromKey low endpoint of the keys in the returned map |
333 |
> |
* @param inclusive true if the low endpoint ({@code fromKey}) is |
334 |
> |
* to be included in the the returned view |
335 |
> |
* @return a view of the portion of this map whose keys are greater than |
336 |
> |
* (or equal to, if {@code inclusive} is true) {@code fromKey} |
337 |
> |
* @throws ClassCastException if {@code fromKey} is not compatible |
338 |
|
* with this map's comparator (or, if the map has no comparator, |
339 |
< |
* if <tt>fromKey</tt> does not implement {@link Comparable}). |
339 |
> |
* if {@code fromKey} does not implement {@link Comparable}). |
340 |
|
* Implementations may, but are not required to, throw this |
341 |
< |
* exception if <tt>fromKey</tt> cannot be compared to keys |
341 |
> |
* exception if {@code fromKey} cannot be compared to keys |
342 |
|
* currently in the map. |
343 |
< |
* @throws NullPointerException if <tt>fromKey</tt> is null |
343 |
> |
* @throws NullPointerException if {@code fromKey} is null |
344 |
|
* and this map does not permit null keys |
345 |
|
* @throws IllegalArgumentException if this map itself has a |
346 |
< |
* restricted range, and <tt>fromKey</tt> lies outside the |
346 |
> |
* restricted range, and {@code fromKey} lies outside the |
347 |
|
* bounds of the range |
348 |
|
*/ |
349 |
< |
NavigableMap<K,V> navigableTailMap(K fromKey); |
349 |
> |
NavigableMap<K,V> tailMap(K fromKey, boolean inclusive); |
350 |
|
} |