| 1 |
|
/* |
| 2 |
|
* Written by Doug Lea and Josh Bloch with assistance from members of JCP |
| 3 |
|
* JSR-166 Expert Group and released to the public domain, as explained at |
| 4 |
< |
* http://creativecommons.org/licenses/publicdomain |
| 4 |
> |
* http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 |
|
*/ |
| 6 |
|
|
| 7 |
|
package java.util; |
| 9 |
|
/** |
| 10 |
|
* A {@link SortedMap} extended with navigation methods returning the |
| 11 |
|
* closest matches for given search targets. Methods |
| 12 |
< |
* {@code lowerEntry}, {@code floorEntry}, {@code ceilingEntry}, |
| 13 |
< |
* and {@code higherEntry} return {@code Map.Entry} objects |
| 12 |
> |
* {@link #lowerEntry}, {@link #floorEntry}, {@link #ceilingEntry}, |
| 13 |
> |
* and {@link #higherEntry} return {@code Map.Entry} objects |
| 14 |
|
* associated with keys respectively less than, less than or equal, |
| 15 |
|
* greater than or equal, and greater than a given key, returning |
| 16 |
|
* {@code null} if there is no such key. Similarly, methods |
| 17 |
< |
* {@code lowerKey}, {@code floorKey}, {@code ceilingKey}, and |
| 18 |
< |
* {@code higherKey} return only the associated keys. All of these |
| 17 |
> |
* {@link #lowerKey}, {@link #floorKey}, {@link #ceilingKey}, and |
| 18 |
> |
* {@link #higherKey} return only the associated keys. All of these |
| 19 |
|
* methods are designed for locating, not traversing entries. |
| 20 |
|
* |
| 21 |
|
* <p>A {@code NavigableMap} may be accessed and traversed in either |
| 22 |
< |
* ascending or descending key order. The {@code descendingMap} |
| 22 |
> |
* ascending or descending key order. The {@link #descendingMap} |
| 23 |
|
* method returns a view of the map with the senses of all relational |
| 24 |
|
* and directional methods inverted. The performance of ascending |
| 25 |
|
* operations and views is likely to be faster than that of descending |
| 26 |
< |
* ones. Methods {@code subMap}, {@code headMap}, |
| 27 |
< |
* and {@code tailMap} differ from the like-named {@code |
| 28 |
< |
* SortedMap} methods in accepting additional arguments describing |
| 29 |
< |
* whether lower and upper bounds are inclusive versus exclusive. |
| 30 |
< |
* Submaps of any {@code NavigableMap} must implement the {@code |
| 31 |
< |
* NavigableMap} interface. |
| 26 |
> |
* ones. Methods |
| 27 |
> |
* {@link #subMap(Object, boolean, Object, boolean) subMap(K, boolean, K, boolean)}, |
| 28 |
> |
* {@link #headMap(Object, boolean) headMap(K, boolean)}, and |
| 29 |
> |
* {@link #tailMap(Object, boolean) tailMap(K, boolean)} |
| 30 |
> |
* differ from the like-named {@code SortedMap} methods in accepting |
| 31 |
> |
* additional arguments describing whether lower and upper bounds are |
| 32 |
> |
* inclusive versus exclusive. Submaps of any {@code NavigableMap} |
| 33 |
> |
* must implement the {@code NavigableMap} interface. |
| 34 |
|
* |
| 35 |
< |
* <p>This interface additionally defines methods {@code firstEntry}, |
| 36 |
< |
* {@code pollFirstEntry}, {@code lastEntry}, and |
| 37 |
< |
* {@code pollLastEntry} that return and/or remove the least and |
| 35 |
> |
* <p>This interface additionally defines methods {@link #firstEntry}, |
| 36 |
> |
* {@link #pollFirstEntry}, {@link #lastEntry}, and |
| 37 |
> |
* {@link #pollLastEntry} that return and/or remove the least and |
| 38 |
|
* greatest mappings, if any exist, else returning {@code null}. |
| 39 |
|
* |
| 40 |
< |
* <p> Implementations of entry-returning methods are expected to |
| 40 |
> |
* <p>Implementations of entry-returning methods are expected to |
| 41 |
|
* return {@code Map.Entry} pairs representing snapshots of mappings |
| 42 |
|
* at the time they were produced, and thus generally do <em>not</em> |
| 43 |
|
* support the optional {@code Entry.setValue} method. Note however |
| 44 |
|
* that it is possible to change mappings in the associated map using |
| 45 |
|
* method {@code put}. |
| 46 |
|
* |
| 47 |
+ |
* <p>Methods |
| 48 |
+ |
* {@link #subMap(Object, Object) subMap(K, K)}, |
| 49 |
+ |
* {@link #headMap(Object) headMap(K)}, and |
| 50 |
+ |
* {@link #tailMap(Object) tailMap(K)} |
| 51 |
+ |
* are specified to return {@code SortedMap} to allow existing |
| 52 |
+ |
* implementations of {@code SortedMap} to be compatibly retrofitted to |
| 53 |
+ |
* implement {@code NavigableMap}, but extensions and implementations |
| 54 |
+ |
* of this interface are encouraged to override these methods to return |
| 55 |
+ |
* {@code NavigableMap}. Similarly, |
| 56 |
+ |
* {@link #keySet()} can be overridden to return {@link NavigableSet}. |
| 57 |
+ |
* |
| 58 |
|
* <p>This interface is a member of the |
| 59 |
< |
* <a href="{@docRoot}/../guide/collections/index.html"> |
| 59 |
> |
* <a href="{@docRoot}/java/util/package-summary.html#CollectionsFramework"> |
| 60 |
|
* Java Collections Framework</a>. |
| 61 |
|
* |
| 62 |
|
* @author Doug Lea |
| 219 |
|
Map.Entry<K,V> pollLastEntry(); |
| 220 |
|
|
| 221 |
|
/** |
| 222 |
< |
* Returns a {@link NavigableMap} view of the mappings contained in this |
| 223 |
< |
* map in descending order. The descending map is backed by this map, so |
| 224 |
< |
* changes to the map are reflected in the descending map, and vice-versa. |
| 225 |
< |
* If either map is modified while an iteration over a collection view of |
| 226 |
< |
* the other map is in progress (except through the iterator's own |
| 227 |
< |
* {@code remove} operation), the results of the iteration are undefined. |
| 222 |
> |
* Returns a reverse order view of the mappings contained in this map. |
| 223 |
> |
* The descending map is backed by this map, so changes to the map are |
| 224 |
> |
* reflected in the descending map, and vice-versa. If either map is |
| 225 |
> |
* modified while an iteration over a collection view of either map |
| 226 |
> |
* is in progress (except through the iterator's own {@code remove} |
| 227 |
> |
* operation), the results of the iteration are undefined. |
| 228 |
> |
* |
| 229 |
> |
* <p>The returned map has an ordering equivalent to |
| 230 |
> |
* {@link Collections#reverseOrder(Comparator) Collections.reverseOrder}{@code (comparator())}. |
| 231 |
> |
* The expression {@code m.descendingMap().descendingMap()} returns a |
| 232 |
> |
* view of {@code m} essentially equivalent to {@code m}. |
| 233 |
|
* |
| 234 |
< |
* @return a navigable map view of the mappings contained in this map, |
| 217 |
< |
* sorted in descending order |
| 234 |
> |
* @return a reverse order view of this map |
| 235 |
|
*/ |
| 236 |
|
NavigableMap<K,V> descendingMap(); |
| 237 |
|
|
| 238 |
|
/** |
| 239 |
< |
* Returns a navigable set view of the keys contained in this navigable |
| 240 |
< |
* map. The set is backed by the map, so changes to the map are reflected |
| 241 |
< |
* in the set, and vice-versa. If the map is modified while an iteration |
| 242 |
< |
* over the set is in progress (except through the iterator's own |
| 243 |
< |
* {@code remove} operation), the results of the iteration are undefined. |
| 244 |
< |
* The set supports element removal, which removes the corresponding |
| 245 |
< |
* mapping from the map, via the {@code Iterator.remove}, |
| 246 |
< |
* {@code Set.remove}, {@code removeAll}, {@code retainAll}, and |
| 247 |
< |
* {@code clear} operations. It does not support the {@code add} or |
| 248 |
< |
* {@code addAll} operations. |
| 239 |
> |
* Returns a {@link NavigableSet} view of the keys contained in this map. |
| 240 |
> |
* The set's iterator returns the keys in ascending order. |
| 241 |
> |
* The set is backed by the map, so changes to the map are reflected in |
| 242 |
> |
* the set, and vice-versa. If the map is modified while an iteration |
| 243 |
> |
* over the set is in progress (except through the iterator's own {@code |
| 244 |
> |
* remove} operation), the results of the iteration are undefined. The |
| 245 |
> |
* set supports element removal, which removes the corresponding mapping |
| 246 |
> |
* from the map, via the {@code Iterator.remove}, {@code Set.remove}, |
| 247 |
> |
* {@code removeAll}, {@code retainAll}, and {@code clear} operations. |
| 248 |
> |
* It does not support the {@code add} or {@code addAll} operations. |
| 249 |
|
* |
| 250 |
< |
* @return a navigable set view of the keys contained in this navigable map |
| 250 |
> |
* @return a navigable set view of the keys in this map |
| 251 |
|
*/ |
| 252 |
|
NavigableSet<K> navigableKeySet(); |
| 253 |
|
|
| 254 |
|
/** |
| 255 |
< |
* Returns a {@link NavigableSet} view of the keys contained in this map. |
| 255 |
> |
* Returns a reverse order {@link NavigableSet} view of the keys contained in this map. |
| 256 |
|
* The set's iterator returns the keys in descending order. |
| 257 |
< |
* The set is backed by the map, so changes to the map are |
| 258 |
< |
* reflected in the set, and vice-versa. If the map is modified |
| 259 |
< |
* while an iteration over the set is in progress (except through |
| 260 |
< |
* the iterator's own <tt>remove</tt> operation), the results of |
| 261 |
< |
* the iteration are undefined. The set supports element removal, |
| 262 |
< |
* which removes the corresponding mapping from the map, via the |
| 263 |
< |
* <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, |
| 264 |
< |
* <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> |
| 248 |
< |
* operations. It does not support the <tt>add</tt> or <tt>addAll</tt> |
| 249 |
< |
* operations. |
| 257 |
> |
* The set is backed by the map, so changes to the map are reflected in |
| 258 |
> |
* the set, and vice-versa. If the map is modified while an iteration |
| 259 |
> |
* over the set is in progress (except through the iterator's own {@code |
| 260 |
> |
* remove} operation), the results of the iteration are undefined. The |
| 261 |
> |
* set supports element removal, which removes the corresponding mapping |
| 262 |
> |
* from the map, via the {@code Iterator.remove}, {@code Set.remove}, |
| 263 |
> |
* {@code removeAll}, {@code retainAll}, and {@code clear} operations. |
| 264 |
> |
* It does not support the {@code add} or {@code addAll} operations. |
| 265 |
|
* |
| 266 |
< |
* @return a set view of the keys contained in this map, sorted in |
| 252 |
< |
* descending order |
| 266 |
> |
* @return a reverse order navigable set view of the keys in this map |
| 267 |
|
*/ |
| 268 |
|
NavigableSet<K> descendingKeySet(); |
| 269 |
|
|
| 271 |
|
* Returns a view of the portion of this map whose keys range from |
| 272 |
|
* {@code fromKey} to {@code toKey}. If {@code fromKey} and |
| 273 |
|
* {@code toKey} are equal, the returned map is empty unless |
| 274 |
< |
* {@code fromExclusive} and {@code toExclusive} are both true. The |
| 274 |
> |
* {@code fromInclusive} and {@code toInclusive} are both true. The |
| 275 |
|
* returned map is backed by this map, so changes in the returned map are |
| 276 |
|
* reflected in this map, and vice-versa. The returned map supports all |
| 277 |
|
* optional map operations that this map supports. |
| 363 |
|
NavigableMap<K,V> tailMap(K fromKey, boolean inclusive); |
| 364 |
|
|
| 365 |
|
/** |
| 366 |
< |
* Equivalent to {@code subMap(fromKey, true, toKey, false)} |
| 353 |
< |
* but with a return type conforming to the {@code SortedMap} interface. |
| 366 |
> |
* {@inheritDoc} |
| 367 |
|
* |
| 368 |
< |
* <p>{@inheritDoc} |
| 368 |
> |
* <p>Equivalent to {@code subMap(fromKey, true, toKey, false)}. |
| 369 |
|
* |
| 370 |
|
* @throws ClassCastException {@inheritDoc} |
| 371 |
|
* @throws NullPointerException {@inheritDoc} |
| 374 |
|
SortedMap<K,V> subMap(K fromKey, K toKey); |
| 375 |
|
|
| 376 |
|
/** |
| 377 |
< |
* Equivalent to {@code headMap(toKey, false)} |
| 365 |
< |
* but with a return type conforming to the {@code SortedMap} interface. |
| 377 |
> |
* {@inheritDoc} |
| 378 |
|
* |
| 379 |
< |
* <p>{@inheritDoc} |
| 379 |
> |
* <p>Equivalent to {@code headMap(toKey, false)}. |
| 380 |
|
* |
| 381 |
|
* @throws ClassCastException {@inheritDoc} |
| 382 |
|
* @throws NullPointerException {@inheritDoc} |
| 385 |
|
SortedMap<K,V> headMap(K toKey); |
| 386 |
|
|
| 387 |
|
/** |
| 388 |
< |
* Equivalent to {@code tailMap(fromKey, true)} |
| 377 |
< |
* but with a return type conforming to the {@code SortedMap} interface. |
| 388 |
> |
* {@inheritDoc} |
| 389 |
|
* |
| 390 |
< |
* <p>{@inheritDoc} |
| 390 |
> |
* <p>Equivalent to {@code tailMap(fromKey, true)}. |
| 391 |
|
* |
| 392 |
|
* @throws ClassCastException {@inheritDoc} |
| 393 |
|
* @throws NullPointerException {@inheritDoc} |
