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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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/** |
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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 their declared return types. |
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* Submaps of any <tt>NavigableMap</tt> must implement the |
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* <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 navigableSubMap}, {@code navigableHeadMap}, |
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* and {@code navigableTailMap} differ from the similarly 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 |
| 187 |
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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 |
| 192 |
< |
* 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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* |
| 194 |
|
* @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 |
| 196 |
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*/ |
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Map.Entry<K,V> pollFirstEntry(); |
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|
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/** |
| 200 |
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* Removes and returns a key-value mapping associated with |
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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, |
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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 |
| 205 |
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*/ |
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Map.Entry<K,V> pollLastEntry(); |
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|
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/** |
| 209 |
< |
* Returns a {@link Set} view of the keys contained in this map. |
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> |
* Returns a {@link NavigableMap} view of the mappings contained in this |
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> |
* map in descending order. The descending map is backed by this map, so |
| 211 |
> |
* 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 |
> |
* {@code remove} operation), the results of the iteration are undefined. |
| 215 |
> |
* |
| 216 |
> |
* @return a navigable map view of the mappings contained in this map, |
| 217 |
> |
* sorted in descending order |
| 218 |
> |
*/ |
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> |
NavigableMap<K,V> descendingMap(); |
| 220 |
> |
|
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> |
/** |
| 222 |
> |
* Returns a navigable set view of the keys contained in this navigable |
| 223 |
> |
* map. The set is backed by the map, so changes to the map are reflected |
| 224 |
> |
* in the set, and vice-versa. If the map is modified while an iteration |
| 225 |
> |
* over the set is in progress (except through the iterator's own |
| 226 |
> |
* {@code remove} operation), the results of the iteration are undefined. |
| 227 |
> |
* The set supports element removal, which removes the corresponding |
| 228 |
> |
* mapping from the map, via the {@code Iterator.remove}, |
| 229 |
> |
* {@code Set.remove}, {@code removeAll} {@code retainAll}, and |
| 230 |
> |
* {@code clear} operations. It does not support the {@code add} or |
| 231 |
> |
* {@code addAll} operations. |
| 232 |
> |
* |
| 233 |
> |
* @return a navigable set view of the keys contained in this navigable map |
| 234 |
> |
*/ |
| 235 |
> |
NavigableSet<K> navigableKeySet(); |
| 236 |
> |
|
| 237 |
> |
/** |
| 238 |
> |
* Returns a {@link NavigableSet} view of the keys contained in this map. |
| 239 |
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* The set's iterator returns the keys in descending order. |
| 240 |
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* The set is backed by the map, so changes to the map are |
| 241 |
|
* 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 |
| 253 |
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*/ |
| 254 |
< |
Set<K> descendingKeySet(); |
| 227 |
< |
|
| 228 |
< |
/** |
| 229 |
< |
* Returns a {@link Set} view of the mappings contained in this map. |
| 230 |
< |
* The set's iterator returns the entries in descending key order. |
| 231 |
< |
* The set is backed by the map, so changes to the map are |
| 232 |
< |
* reflected in the set, and vice-versa. If the map is modified |
| 233 |
< |
* while an iteration over the set is in progress (except through |
| 234 |
< |
* the iterator's own <tt>remove</tt> operation, or through the |
| 235 |
< |
* <tt>setValue</tt> operation on a map entry returned by the |
| 236 |
< |
* iterator) the results of the iteration are undefined. The set |
| 237 |
< |
* supports element removal, which removes the corresponding |
| 238 |
< |
* mapping from the map, via the <tt>Iterator.remove</tt>, |
| 239 |
< |
* <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt> and |
| 240 |
< |
* <tt>clear</tt> operations. It does not support the |
| 241 |
< |
* <tt>add</tt> or <tt>addAll</tt> operations. |
| 242 |
< |
* |
| 243 |
< |
* @return a set view of the mappings contained in this map, |
| 244 |
< |
* sorted in descending key order |
| 245 |
< |
*/ |
| 246 |
< |
Set<Map.Entry<K, V>> descendingEntrySet(); |
| 254 |
> |
NavigableSet<K> descendingKeySet(); |
| 255 |
|
|
| 256 |
|
/** |
| 257 |
|
* Returns a view of the portion of this map whose keys range from |
| 258 |
< |
* <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive. (If |
| 259 |
< |
* <tt>fromKey</tt> and <tt>toKey</tt> are equal, the returned map |
| 260 |
< |
* is empty.) The returned map is backed by this map, so changes |
| 261 |
< |
* in the returned map are reflected in this map, and vice-versa. |
| 262 |
< |
* The returned map supports all optional map operations that this |
| 263 |
< |
* map supports. |
| 256 |
< |
* |
| 257 |
< |
* <p>The returned map will throw an <tt>IllegalArgumentException</tt> |
| 258 |
< |
* 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 |
|
* |
| 265 |
< |
* @param fromKey low endpoint (inclusive) of the keys in the returned map |
| 266 |
< |
* @param toKey high endpoint (exclusive) of the keys in the returned map |
| 265 |
> |
* <p>The returned map will throw an {@code IllegalArgumentException} |
| 266 |
> |
* 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 |
> |
* @param fromInclusive true if the low endpoint ({@code fromKey}) is |
| 271 |
> |
* 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 |
|
* @return a view of the portion of this map whose keys range from |
| 276 |
< |
* <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive |
| 277 |
< |
* @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 |
|
* cannot be compared to one another using this map's comparator |
| 279 |
|
* (or, if the map has no comparator, using natural ordering). |
| 280 |
|
* Implementations may, but are not required to, throw this |
| 281 |
< |
* exception if <tt>fromKey</tt> or <tt>toKey</tt> |
| 281 |
> |
* exception if {@code fromKey} or {@code toKey} |
| 282 |
|
* 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 |
|
* is null and this map does not permit null keys |
| 285 |
< |
* @throws IllegalArgumentException if <tt>fromKey</tt> is greater than |
| 286 |
< |
* <tt>toKey</tt>; or if this map itself has a restricted |
| 287 |
< |
* range, and <tt>fromKey</tt> or <tt>toKey</tt> lies |
| 285 |
> |
* @throws IllegalArgumentException if {@code fromKey} is greater than |
| 286 |
> |
* {@code toKey}; or if this map itself has a restricted |
| 287 |
> |
* range, and {@code fromKey} or {@code toKey} lies |
| 288 |
|
* outside the bounds of the range |
| 289 |
|
*/ |
| 290 |
< |
NavigableMap<K,V> navigableSubMap(K fromKey, K toKey); |
| 290 |
> |
NavigableMap<K,V> navigableSubMap(K fromKey, boolean fromInclusive, |
| 291 |
> |
K toKey, boolean toInclusive); |
| 292 |
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|
| 293 |
|
/** |
| 294 |
< |
* Returns a view of the portion of this map whose keys are |
| 295 |
< |
* strictly less than <tt>toKey</tt>. The returned map is backed |
| 296 |
< |
* by this map, so changes in the returned map are reflected in |
| 297 |
< |
* this map, and vice-versa. The returned map supports all |
| 298 |
< |
* 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 |
> |
* map operations that this map supports. |
| 299 |
|
* |
| 300 |
< |
* <p>The returned map will throw an <tt>IllegalArgumentException</tt> |
| 300 |
> |
* <p>The returned map will throw an {@code IllegalArgumentException} |
| 301 |
|
* on an attempt to insert a key outside its range. |
| 302 |
|
* |
| 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> navigableHeadMap(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> navigableTailMap(K fromKey, boolean inclusive); |
| 350 |
|
} |
