mirror of git://gcc.gnu.org/git/gcc.git
396 lines
17 KiB
Java
396 lines
17 KiB
Java
/*
|
|
* Written by Doug Lea and Josh Bloch with assistance from members of JCP
|
|
* JSR-166 Expert Group and released to the public domain, as explained at
|
|
* http://creativecommons.org/licenses/publicdomain
|
|
*/
|
|
|
|
package java.util;
|
|
|
|
/**
|
|
* A {@link SortedMap} extended with navigation methods returning the
|
|
* closest matches for given search targets. Methods
|
|
* {@code lowerEntry}, {@code floorEntry}, {@code ceilingEntry},
|
|
* and {@code higherEntry} return {@code Map.Entry} objects
|
|
* associated with keys respectively less than, less than or equal,
|
|
* greater than or equal, and greater than a given key, returning
|
|
* {@code null} if there is no such key. Similarly, methods
|
|
* {@code lowerKey}, {@code floorKey}, {@code ceilingKey}, and
|
|
* {@code higherKey} return only the associated keys. All of these
|
|
* methods are designed for locating, not traversing entries.
|
|
*
|
|
* <p>A {@code NavigableMap} may be accessed and traversed in either
|
|
* ascending or descending key order. The {@code descendingMap}
|
|
* method returns a view of the map with the senses of all relational
|
|
* and directional methods inverted. The performance of ascending
|
|
* operations and views is likely to be faster than that of descending
|
|
* ones. Methods {@code subMap}, {@code headMap},
|
|
* and {@code tailMap} differ from the like-named {@code
|
|
* SortedMap} methods in accepting additional arguments describing
|
|
* whether lower and upper bounds are inclusive versus exclusive.
|
|
* Submaps of any {@code NavigableMap} must implement the {@code
|
|
* NavigableMap} interface.
|
|
*
|
|
* <p>This interface additionally defines methods {@code firstEntry},
|
|
* {@code pollFirstEntry}, {@code lastEntry}, and
|
|
* {@code pollLastEntry} that return and/or remove the least and
|
|
* greatest mappings, if any exist, else returning {@code null}.
|
|
*
|
|
* <p>Implementations of entry-returning methods are expected to
|
|
* return {@code Map.Entry} pairs representing snapshots of mappings
|
|
* at the time they were produced, and thus generally do <em>not</em>
|
|
* support the optional {@code Entry.setValue} method. Note however
|
|
* that it is possible to change mappings in the associated map using
|
|
* method {@code put}.
|
|
*
|
|
* <p>Methods
|
|
* {@link #subMap(Object, Object) subMap(K, K)},
|
|
* {@link #headMap(Object) headMap(K)}, and
|
|
* {@link #tailMap(Object) tailMap(K)}
|
|
* are specified to return {@code SortedMap} to allow existing
|
|
* implementations of {@code SortedMap} to be compatibly retrofitted to
|
|
* implement {@code NavigableMap}, but extensions and implementations
|
|
* of this interface are encouraged to override these methods to return
|
|
* {@code NavigableMap}. Similarly,
|
|
* {@link #keySet()} can be overriden to return {@code NavigableSet}.
|
|
*
|
|
* <p>This interface is a member of the
|
|
* <a href="{@docRoot}/../technotes/guides/collections/index.html">
|
|
* Java Collections Framework</a>.
|
|
*
|
|
* @author Doug Lea
|
|
* @author Josh Bloch
|
|
* @param <K> the type of keys maintained by this map
|
|
* @param <V> the type of mapped values
|
|
* @since 1.6
|
|
*/
|
|
public interface NavigableMap<K,V> extends SortedMap<K,V> {
|
|
/**
|
|
* Returns a key-value mapping associated with the greatest key
|
|
* strictly less than the given key, or {@code null} if there is
|
|
* no such key.
|
|
*
|
|
* @param key the key
|
|
* @return an entry with the greatest key less than {@code key},
|
|
* or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
Map.Entry<K,V> lowerEntry(K key);
|
|
|
|
/**
|
|
* Returns the greatest key strictly less than the given key, or
|
|
* {@code null} if there is no such key.
|
|
*
|
|
* @param key the key
|
|
* @return the greatest key less than {@code key},
|
|
* or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
K lowerKey(K key);
|
|
|
|
/**
|
|
* Returns a key-value mapping associated with the greatest key
|
|
* less than or equal to the given key, or {@code null} if there
|
|
* is no such key.
|
|
*
|
|
* @param key the key
|
|
* @return an entry with the greatest key less than or equal to
|
|
* {@code key}, or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
Map.Entry<K,V> floorEntry(K key);
|
|
|
|
/**
|
|
* Returns the greatest key less than or equal to the given key,
|
|
* or {@code null} if there is no such key.
|
|
*
|
|
* @param key the key
|
|
* @return the greatest key less than or equal to {@code key},
|
|
* or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
K floorKey(K key);
|
|
|
|
/**
|
|
* Returns a key-value mapping associated with the least key
|
|
* greater than or equal to the given key, or {@code null} if
|
|
* there is no such key.
|
|
*
|
|
* @param key the key
|
|
* @return an entry with the least key greater than or equal to
|
|
* {@code key}, or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
Map.Entry<K,V> ceilingEntry(K key);
|
|
|
|
/**
|
|
* Returns the least key greater than or equal to the given key,
|
|
* or {@code null} if there is no such key.
|
|
*
|
|
* @param key the key
|
|
* @return the least key greater than or equal to {@code key},
|
|
* or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
K ceilingKey(K key);
|
|
|
|
/**
|
|
* Returns a key-value mapping associated with the least key
|
|
* strictly greater than the given key, or {@code null} if there
|
|
* is no such key.
|
|
*
|
|
* @param key the key
|
|
* @return an entry with the least key greater than {@code key},
|
|
* or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
Map.Entry<K,V> higherEntry(K key);
|
|
|
|
/**
|
|
* Returns the least key strictly greater than the given key, or
|
|
* {@code null} if there is no such key.
|
|
*
|
|
* @param key the key
|
|
* @return the least key greater than {@code key},
|
|
* or {@code null} if there is no such key
|
|
* @throws ClassCastException if the specified key cannot be compared
|
|
* with the keys currently in the map
|
|
* @throws NullPointerException if the specified key is null
|
|
* and this map does not permit null keys
|
|
*/
|
|
K higherKey(K key);
|
|
|
|
/**
|
|
* Returns a key-value mapping associated with the least
|
|
* key in this map, or {@code null} if the map is empty.
|
|
*
|
|
* @return an entry with the least key,
|
|
* or {@code null} if this map is empty
|
|
*/
|
|
Map.Entry<K,V> firstEntry();
|
|
|
|
/**
|
|
* Returns a key-value mapping associated with the greatest
|
|
* key in this map, or {@code null} if the map is empty.
|
|
*
|
|
* @return an entry with the greatest key,
|
|
* or {@code null} if this map is empty
|
|
*/
|
|
Map.Entry<K,V> lastEntry();
|
|
|
|
/**
|
|
* Removes and returns a key-value mapping associated with
|
|
* the least key in this map, or {@code null} if the map is empty.
|
|
*
|
|
* @return the removed first entry of this map,
|
|
* or {@code null} if this map is empty
|
|
*/
|
|
Map.Entry<K,V> pollFirstEntry();
|
|
|
|
/**
|
|
* Removes and returns a key-value mapping associated with
|
|
* the greatest key in this map, or {@code null} if the map is empty.
|
|
*
|
|
* @return the removed last entry of this map,
|
|
* or {@code null} if this map is empty
|
|
*/
|
|
Map.Entry<K,V> pollLastEntry();
|
|
|
|
/**
|
|
* Returns a reverse order view of the mappings contained in this map.
|
|
* The descending map is backed by this map, so changes to the map are
|
|
* reflected in the descending map, and vice-versa. If either map is
|
|
* modified while an iteration over a collection view of either map
|
|
* is in progress (except through the iterator's own {@code remove}
|
|
* operation), the results of the iteration are undefined.
|
|
*
|
|
* <p>The returned map has an ordering equivalent to
|
|
* <tt>{@link Collections#reverseOrder(Comparator) Collections.reverseOrder}(comparator())</tt>.
|
|
* The expression {@code m.descendingMap().descendingMap()} returns a
|
|
* view of {@code m} essentially equivalent to {@code m}.
|
|
*
|
|
* @return a reverse order view of this map
|
|
*/
|
|
NavigableMap<K,V> descendingMap();
|
|
|
|
/**
|
|
* Returns a {@link NavigableSet} view of the keys contained in this map.
|
|
* The set's iterator returns the keys in ascending order.
|
|
* The set is backed by the map, so changes to the map are reflected in
|
|
* the set, and vice-versa. If the map is modified while an iteration
|
|
* over the set is in progress (except through the iterator's own {@code
|
|
* remove} operation), the results of the iteration are undefined. The
|
|
* set supports element removal, which removes the corresponding mapping
|
|
* from the map, via the {@code Iterator.remove}, {@code Set.remove},
|
|
* {@code removeAll}, {@code retainAll}, and {@code clear} operations.
|
|
* It does not support the {@code add} or {@code addAll} operations.
|
|
*
|
|
* @return a navigable set view of the keys in this map
|
|
*/
|
|
NavigableSet<K> navigableKeySet();
|
|
|
|
/**
|
|
* Returns a reverse order {@link NavigableSet} view of the keys contained in this map.
|
|
* The set's iterator returns the keys in descending order.
|
|
* The set is backed by the map, so changes to the map are reflected in
|
|
* the set, and vice-versa. If the map is modified while an iteration
|
|
* over the set is in progress (except through the iterator's own {@code
|
|
* remove} operation), the results of the iteration are undefined. The
|
|
* set supports element removal, which removes the corresponding mapping
|
|
* from the map, via the {@code Iterator.remove}, {@code Set.remove},
|
|
* {@code removeAll}, {@code retainAll}, and {@code clear} operations.
|
|
* It does not support the {@code add} or {@code addAll} operations.
|
|
*
|
|
* @return a reverse order navigable set view of the keys in this map
|
|
*/
|
|
NavigableSet<K> descendingKeySet();
|
|
|
|
/**
|
|
* Returns a view of the portion of this map whose keys range from
|
|
* {@code fromKey} to {@code toKey}. If {@code fromKey} and
|
|
* {@code toKey} are equal, the returned map is empty unless
|
|
* {@code fromExclusive} and {@code toExclusive} are both true. The
|
|
* returned map is backed by this map, so changes in the returned map are
|
|
* reflected in this map, and vice-versa. The returned map supports all
|
|
* optional map operations that this map supports.
|
|
*
|
|
* <p>The returned map will throw an {@code IllegalArgumentException}
|
|
* on an attempt to insert a key outside of its range, or to construct a
|
|
* submap either of whose endpoints lie outside its range.
|
|
*
|
|
* @param fromKey low endpoint of the keys in the returned map
|
|
* @param fromInclusive {@code true} if the low endpoint
|
|
* is to be included in the returned view
|
|
* @param toKey high endpoint of the keys in the returned map
|
|
* @param toInclusive {@code true} if the high endpoint
|
|
* is to be included in the returned view
|
|
* @return a view of the portion of this map whose keys range from
|
|
* {@code fromKey} to {@code toKey}
|
|
* @throws ClassCastException if {@code fromKey} and {@code toKey}
|
|
* cannot be compared to one another using this map's comparator
|
|
* (or, if the map has no comparator, using natural ordering).
|
|
* Implementations may, but are not required to, throw this
|
|
* exception if {@code fromKey} or {@code toKey}
|
|
* cannot be compared to keys currently in the map.
|
|
* @throws NullPointerException if {@code fromKey} or {@code toKey}
|
|
* is null and this map does not permit null keys
|
|
* @throws IllegalArgumentException if {@code fromKey} is greater than
|
|
* {@code toKey}; or if this map itself has a restricted
|
|
* range, and {@code fromKey} or {@code toKey} lies
|
|
* outside the bounds of the range
|
|
*/
|
|
NavigableMap<K,V> subMap(K fromKey, boolean fromInclusive,
|
|
K toKey, boolean toInclusive);
|
|
|
|
/**
|
|
* Returns a view of the portion of this map whose keys are less than (or
|
|
* equal to, if {@code inclusive} is true) {@code toKey}. The returned
|
|
* map is backed by this map, so changes in the returned map are reflected
|
|
* in this map, and vice-versa. The returned map supports all optional
|
|
* map operations that this map supports.
|
|
*
|
|
* <p>The returned map will throw an {@code IllegalArgumentException}
|
|
* on an attempt to insert a key outside its range.
|
|
*
|
|
* @param toKey high endpoint of the keys in the returned map
|
|
* @param inclusive {@code true} if the high endpoint
|
|
* is to be included in the returned view
|
|
* @return a view of the portion of this map whose keys are less than
|
|
* (or equal to, if {@code inclusive} is true) {@code toKey}
|
|
* @throws ClassCastException if {@code toKey} is not compatible
|
|
* with this map's comparator (or, if the map has no comparator,
|
|
* if {@code toKey} does not implement {@link Comparable}).
|
|
* Implementations may, but are not required to, throw this
|
|
* exception if {@code toKey} cannot be compared to keys
|
|
* currently in the map.
|
|
* @throws NullPointerException if {@code toKey} is null
|
|
* and this map does not permit null keys
|
|
* @throws IllegalArgumentException if this map itself has a
|
|
* restricted range, and {@code toKey} lies outside the
|
|
* bounds of the range
|
|
*/
|
|
NavigableMap<K,V> headMap(K toKey, boolean inclusive);
|
|
|
|
/**
|
|
* Returns a view of the portion of this map whose keys are greater than (or
|
|
* equal to, if {@code inclusive} is true) {@code fromKey}. The returned
|
|
* map is backed by this map, so changes in the returned map are reflected
|
|
* in this map, and vice-versa. The returned map supports all optional
|
|
* map operations that this map supports.
|
|
*
|
|
* <p>The returned map will throw an {@code IllegalArgumentException}
|
|
* on an attempt to insert a key outside its range.
|
|
*
|
|
* @param fromKey low endpoint of the keys in the returned map
|
|
* @param inclusive {@code true} if the low endpoint
|
|
* is to be included in the returned view
|
|
* @return a view of the portion of this map whose keys are greater than
|
|
* (or equal to, if {@code inclusive} is true) {@code fromKey}
|
|
* @throws ClassCastException if {@code fromKey} is not compatible
|
|
* with this map's comparator (or, if the map has no comparator,
|
|
* if {@code fromKey} does not implement {@link Comparable}).
|
|
* Implementations may, but are not required to, throw this
|
|
* exception if {@code fromKey} cannot be compared to keys
|
|
* currently in the map.
|
|
* @throws NullPointerException if {@code fromKey} is null
|
|
* and this map does not permit null keys
|
|
* @throws IllegalArgumentException if this map itself has a
|
|
* restricted range, and {@code fromKey} lies outside the
|
|
* bounds of the range
|
|
*/
|
|
NavigableMap<K,V> tailMap(K fromKey, boolean inclusive);
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*
|
|
* <p>Equivalent to {@code subMap(fromKey, true, toKey, false)}.
|
|
*
|
|
* @throws ClassCastException {@inheritDoc}
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @throws IllegalArgumentException {@inheritDoc}
|
|
*/
|
|
SortedMap<K,V> subMap(K fromKey, K toKey);
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*
|
|
* <p>Equivalent to {@code headMap(toKey, false)}.
|
|
*
|
|
* @throws ClassCastException {@inheritDoc}
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @throws IllegalArgumentException {@inheritDoc}
|
|
*/
|
|
SortedMap<K,V> headMap(K toKey);
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*
|
|
* <p>Equivalent to {@code tailMap(fromKey, true)}.
|
|
*
|
|
* @throws ClassCastException {@inheritDoc}
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @throws IllegalArgumentException {@inheritDoc}
|
|
*/
|
|
SortedMap<K,V> tailMap(K fromKey);
|
|
}
|