11 |
|
/** |
12 |
|
* A {@link SortedMap} extended with navigation methods returning the |
13 |
|
* closest matches for given search targets. Methods |
14 |
< |
* <tt>lowerEntry</tt>, <tt>floorEntry</tt>, <tt>ceilingEntry</tt>, |
15 |
< |
* and <tt>higherEntry</tt> return <tt>Map.Entry</tt> objects |
14 |
> |
* {@code lowerEntry}, {@code floorEntry}, {@code ceilingEntry}, |
15 |
> |
* and {@code higherEntry} return {@code Map.Entry} objects |
16 |
|
* associated with keys respectively less than, less than or equal, |
17 |
|
* greater than or equal, and greater than a given key, returning |
18 |
< |
* <tt>null</tt> if there is no such key. Similarly, methods |
19 |
< |
* <tt>lowerKey</tt>, <tt>floorKey</tt>, <tt>ceilingKey</tt>, and |
20 |
< |
* <tt>higherKey</tt> return only the associated keys. All of these |
18 |
> |
* {@code null} if there is no such key. Similarly, methods |
19 |
> |
* {@code lowerKey}, {@code floorKey}, {@code ceilingKey}, and |
20 |
> |
* {@code higherKey} return only the associated keys. All of these |
21 |
|
* methods are designed for locating, not traversing entries. |
22 |
|
* |
23 |
< |
* <p>A <tt>NavigableMap</tt> may be viewed and traversed in either |
24 |
< |
* ascending or descending key order. The <tt>Map</tt> methods |
25 |
< |
* <tt>keySet</tt> and <tt>entrySet</tt> return ascending views, and |
26 |
< |
* the additional methods <tt>descendingKeySet</tt> and |
27 |
< |
* <tt>descendingEntrySet</tt> return descending views. The |
23 |
> |
* <p>A {@code NavigableMap} may be viewed and traversed in either |
24 |
> |
* ascending or descending key order. The {@code Map} methods |
25 |
> |
* {@code keySet} and {@code entrySet} return ascending views, and |
26 |
> |
* the additional methods {@code descendingKeySet} and |
27 |
> |
* {@code descendingEntrySet} return descending views. The |
28 |
|
* performance of ascending traversals is likely to be faster than |
29 |
|
* descending traversals. Notice that it is possible to perform |
30 |
< |
* subrannge traversals in either direction using <tt>SubMap</tt>. |
30 |
> |
* subrannge traversals in either direction using {@code SubMap}. |
31 |
|
* |
32 |
< |
* <p>This interface additionally defines methods <tt>firstEntry</tt>, |
33 |
< |
* <tt>pollFirstEntry</tt>, <tt>lastEntry</tt>, and |
34 |
< |
* <tt>pollLastEntry</tt> that return and/or remove the least and |
35 |
< |
* greatest mappings, if any exist, else returning <tt>null</tt>. |
32 |
> |
* <p>This interface additionally defines methods {@code firstEntry}, |
33 |
> |
* {@code pollFirstEntry}, {@code lastEntry}, and |
34 |
> |
* {@code pollLastEntry} that return and/or remove the least and |
35 |
> |
* greatest mappings, if any exist, else returning {@code null}. |
36 |
|
* |
37 |
|
* <p>Implementations of entry-returning methods are expected to |
38 |
< |
* return <tt>Map.Entry</tt> pairs representing snapshots of mappings |
38 |
> |
* return {@code Map.Entry} pairs representing snapshots of mappings |
39 |
|
* at the time they were produced, and thus generally do <em>not</em> |
40 |
< |
* support the optional <tt>Entry.setValue</tt> method. Note however |
40 |
> |
* support the optional {@code Entry.setValue} method. Note however |
41 |
|
* that it is possible to change mappings in the associated map using |
42 |
< |
* method <tt>put</tt>. |
42 |
> |
* method {@code put}. |
43 |
|
* |
44 |
|
* @author Doug Lea |
45 |
|
* @param <K> the type of keys maintained by this map |
48 |
|
public interface NavigableMap<K,V> extends SortedMap<K,V> { |
49 |
|
/** |
50 |
|
* Returns a key-value mapping associated with the least key |
51 |
< |
* greater than or equal to the given key, or <tt>null</tt> if there is |
51 |
> |
* greater than or equal to the given key, or {@code null} if there is |
52 |
|
* no such entry. |
53 |
|
* |
54 |
< |
* @param key the key. |
55 |
< |
* @return an Entry associated with ceiling of given key, or <tt>null</tt> |
56 |
< |
* if there is no such Entry. |
54 |
> |
* @param key the key |
55 |
> |
* @return an Entry associated with ceiling of given key, or {@code null} |
56 |
> |
* if there is no such Entry |
57 |
|
* @throws ClassCastException if key cannot be compared with the keys |
58 |
< |
* currently in the map. |
59 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
60 |
< |
* does not support <tt>null</tt> keys. |
58 |
> |
* currently in the map |
59 |
> |
* @throws NullPointerException if key is {@code null} and this map |
60 |
> |
* does not support {@code null} keys |
61 |
|
*/ |
62 |
|
public Map.Entry<K,V> ceilingEntry(K key); |
63 |
|
|
64 |
|
/** |
65 |
|
* Returns least key greater than or equal to the given key, or |
66 |
< |
* <tt>null</tt> if there is no such key. |
66 |
> |
* {@code null} if there is no such key. |
67 |
|
* |
68 |
< |
* @param key the key. |
69 |
< |
* @return the ceiling key, or <tt>null</tt> |
70 |
< |
* if there is no such key. |
68 |
> |
* @param key the key |
69 |
> |
* @return the ceiling key, or {@code null} |
70 |
> |
* if there is no such key |
71 |
|
* @throws ClassCastException if key cannot be compared with the keys |
72 |
< |
* currently in the map. |
73 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
74 |
< |
* does not support <tt>null</tt> keys. |
72 |
> |
* currently in the map |
73 |
> |
* @throws NullPointerException if key is {@code null} and this map |
74 |
> |
* does not support {@code null} keys |
75 |
|
*/ |
76 |
|
public K ceilingKey(K key); |
77 |
|
|
78 |
|
/** |
79 |
|
* Returns a key-value mapping associated with the greatest |
80 |
< |
* key strictly less than the given key, or <tt>null</tt> if there is no |
80 |
> |
* key strictly less than the given key, or {@code null} if there is no |
81 |
|
* such entry. |
82 |
|
* |
83 |
< |
* @param key the key. |
83 |
> |
* @param key the key |
84 |
|
* @return an Entry with greatest key less than the given |
85 |
< |
* key, or <tt>null</tt> if there is no such Entry. |
85 |
> |
* key, or {@code null} if there is no such Entry |
86 |
|
* @throws ClassCastException if key cannot be compared with the keys |
87 |
< |
* currently in the map. |
88 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
89 |
< |
* does not support <tt>null</tt> keys. |
87 |
> |
* currently in the map |
88 |
> |
* @throws NullPointerException if key is {@code null} and this map |
89 |
> |
* does not support {@code null} keys |
90 |
|
*/ |
91 |
|
public Map.Entry<K,V> lowerEntry(K key); |
92 |
|
|
93 |
|
/** |
94 |
|
* Returns the greatest key strictly less than the given key, or |
95 |
< |
* <tt>null</tt> if there is no such key. |
95 |
> |
* {@code null} if there is no such key. |
96 |
|
* |
97 |
< |
* @param key the key. |
97 |
> |
* @param key the key |
98 |
|
* @return the greatest key less than the given |
99 |
< |
* key, or <tt>null</tt> if there is no such key. |
99 |
> |
* key, or {@code null} if there is no such key |
100 |
|
* @throws ClassCastException if key cannot be compared with the keys |
101 |
< |
* currently in the map. |
102 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
103 |
< |
* does not support <tt>null</tt> keys. |
101 |
> |
* currently in the map |
102 |
> |
* @throws NullPointerException if key is {@code null} and this map |
103 |
> |
* does not support {@code null} keys |
104 |
|
*/ |
105 |
|
public K lowerKey(K key); |
106 |
|
|
107 |
|
/** |
108 |
|
* Returns a key-value mapping associated with the greatest key |
109 |
< |
* less than or equal to the given key, or <tt>null</tt> if there |
109 |
> |
* less than or equal to the given key, or {@code null} if there |
110 |
|
* is no such entry. |
111 |
|
* |
112 |
< |
* @param key the key. |
113 |
< |
* @return an Entry associated with floor of given key, or <tt>null</tt> |
114 |
< |
* if there is no such Entry. |
112 |
> |
* @param key the key |
113 |
> |
* @return an Entry associated with floor of given key, or {@code null} |
114 |
> |
* if there is no such Entry |
115 |
|
* @throws ClassCastException if key cannot be compared with the keys |
116 |
< |
* currently in the map. |
117 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
118 |
< |
* does not support <tt>null</tt> keys. |
116 |
> |
* currently in the map |
117 |
> |
* @throws NullPointerException if key is {@code null} and this map |
118 |
> |
* does not support {@code null} keys |
119 |
|
*/ |
120 |
|
public Map.Entry<K,V> floorEntry(K key); |
121 |
|
|
122 |
|
/** |
123 |
|
* Returns the greatest key |
124 |
< |
* less than or equal to the given key, or <tt>null</tt> if there |
124 |
> |
* less than or equal to the given key, or {@code null} if there |
125 |
|
* is no such key. |
126 |
|
* |
127 |
< |
* @param key the key. |
128 |
< |
* @return the floor of given key, or <tt>null</tt> if there is no |
129 |
< |
* such key. |
127 |
> |
* @param key the key |
128 |
> |
* @return the floor of given key, or {@code null} if there is no |
129 |
> |
* such key |
130 |
|
* @throws ClassCastException if key cannot be compared with the keys |
131 |
< |
* currently in the map. |
132 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
133 |
< |
* does not support <tt>null</tt> keys. |
131 |
> |
* currently in the map |
132 |
> |
* @throws NullPointerException if key is {@code null} and this map |
133 |
> |
* does not support {@code null} keys |
134 |
|
*/ |
135 |
|
public K floorKey(K key); |
136 |
|
|
137 |
|
/** |
138 |
|
* Returns a key-value mapping associated with the least key |
139 |
< |
* strictly greater than the given key, or <tt>null</tt> if there |
139 |
> |
* strictly greater than the given key, or {@code null} if there |
140 |
|
* is no such entry. |
141 |
|
* |
142 |
< |
* @param key the key. |
142 |
> |
* @param key the key |
143 |
|
* @return an Entry with least key greater than the given key, or |
144 |
< |
* <tt>null</tt> if there is no such Entry. |
144 |
> |
* {@code null} if there is no such Entry |
145 |
|
* @throws ClassCastException if key cannot be compared with the keys |
146 |
< |
* currently in the map. |
147 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
148 |
< |
* does not support <tt>null</tt> keys. |
146 |
> |
* currently in the map |
147 |
> |
* @throws NullPointerException if key is {@code null} and this map |
148 |
> |
* does not support {@code null} keys |
149 |
|
*/ |
150 |
|
public Map.Entry<K,V> higherEntry(K key); |
151 |
|
|
152 |
|
/** |
153 |
|
* Returns the least key strictly greater than the given key, or |
154 |
< |
* <tt>null</tt> if there is no such key. |
154 |
> |
* {@code null} if there is no such key. |
155 |
|
* |
156 |
< |
* @param key the key. |
156 |
> |
* @param key the key |
157 |
|
* @return the least key greater than the given key, or |
158 |
< |
* <tt>null</tt> if there is no such key. |
158 |
> |
* {@code null} if there is no such key |
159 |
|
* @throws ClassCastException if key cannot be compared with the keys |
160 |
< |
* currently in the map. |
161 |
< |
* @throws NullPointerException if key is <tt>null</tt> and this map |
162 |
< |
* does not support <tt>null</tt> keys. |
160 |
> |
* currently in the map |
161 |
> |
* @throws NullPointerException if key is {@code null} and this map |
162 |
> |
* does not support {@code null} keys |
163 |
|
*/ |
164 |
|
public K higherKey(K key); |
165 |
|
|
166 |
|
/** |
167 |
|
* Returns a key-value mapping associated with the least |
168 |
< |
* key in this map, or <tt>null</tt> if the map is empty. |
168 |
> |
* key in this map, or {@code null} if the map is empty. |
169 |
|
* |
170 |
< |
* @return an Entry with least key, or <tt>null</tt> |
171 |
< |
* if the map is empty. |
170 |
> |
* @return an Entry with least key, or {@code null} |
171 |
> |
* if the map is empty |
172 |
|
*/ |
173 |
|
public Map.Entry<K,V> firstEntry(); |
174 |
|
|
175 |
|
/** |
176 |
|
* Returns a key-value mapping associated with the greatest |
177 |
< |
* key in this map, or <tt>null</tt> if the map is empty. |
177 |
> |
* key in this map, or {@code null} if the map is empty. |
178 |
|
* |
179 |
< |
* @return an Entry with greatest key, or <tt>null</tt> |
180 |
< |
* if the map is empty. |
179 |
> |
* @return an Entry with greatest key, or {@code null} |
180 |
> |
* if the map is empty |
181 |
|
*/ |
182 |
|
public Map.Entry<K,V> lastEntry(); |
183 |
|
|
184 |
|
/** |
185 |
|
* Removes and returns a key-value mapping associated with |
186 |
< |
* the least key in this map, or <tt>null</tt> if the map is empty. |
186 |
> |
* the least key in this map, or {@code null} if the map is empty. |
187 |
|
* |
188 |
< |
* @return the removed first entry of this map, or <tt>null</tt> |
189 |
< |
* if the map is empty. |
188 |
> |
* @return the removed first entry of this map, or {@code null} |
189 |
> |
* if the map is empty |
190 |
|
*/ |
191 |
|
public Map.Entry<K,V> pollFirstEntry(); |
192 |
|
|
193 |
|
/** |
194 |
|
* Removes and returns a key-value mapping associated with |
195 |
< |
* the greatest key in this map, or <tt>null</tt> if the map is empty. |
195 |
> |
* the greatest key in this map, or {@code null} if the map is empty. |
196 |
|
* |
197 |
< |
* @return the removed last entry of this map, or <tt>null</tt> |
198 |
< |
* if the map is empty. |
197 |
> |
* @return the removed last entry of this map, or {@code null} |
198 |
> |
* if the map is empty |
199 |
|
*/ |
200 |
|
public Map.Entry<K,V> pollLastEntry(); |
201 |
|
|
204 |
|
* descending key order. The set is backed by the map, so changes |
205 |
|
* to the map are reflected in the set, and vice-versa. If the |
206 |
|
* map is modified while an iteration over the set is in progress |
207 |
< |
* (except through the iterator's own <tt>remove</tt> operation), |
207 |
> |
* (except through the iterator's own {@code remove} operation), |
208 |
|
* the results of the iteration are undefined. The set supports |
209 |
|
* element removal, which removes the corresponding mapping from |
210 |
< |
* the map, via the <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, |
211 |
< |
* <tt>removeAll</tt> <tt>retainAll</tt>, and <tt>clear</tt> |
212 |
< |
* operations. It does not support the add or <tt>addAll</tt> |
210 |
> |
* the map, via the {@code Iterator.remove}, {@code Set.remove}, |
211 |
> |
* {@code removeAll} {@code retainAll}, and {@code clear} |
212 |
> |
* operations. It does not support the add or {@code addAll} |
213 |
|
* operations. |
214 |
|
* |
215 |
< |
* @return a set view of the keys contained in this map. |
215 |
> |
* @return a set view of the keys contained in this map |
216 |
|
*/ |
217 |
|
Set<K> descendingKeySet(); |
218 |
|
|
219 |
|
/** |
220 |
|
* Returns a set view of the mappings contained in this map, in |
221 |
|
* descending key order. Each element in the returned set is a |
222 |
< |
* <tt>Map.Entry</tt>. The set is backed by the map, so changes to |
222 |
> |
* {@code Map.Entry}. The set is backed by the map, so changes to |
223 |
|
* the map are reflected in the set, and vice-versa. If the map |
224 |
|
* is modified while an iteration over the set is in progress |
225 |
< |
* (except through the iterator's own <tt>remove</tt> operation, |
226 |
< |
* or through the <tt>setValue</tt> operation on a map entry |
225 |
> |
* (except through the iterator's own {@code remove} operation, |
226 |
> |
* or through the {@code setValue} operation on a map entry |
227 |
|
* returned by the iterator) the results of the iteration are |
228 |
|
* undefined. The set supports element removal, which removes the |
229 |
|
* corresponding mapping from the map, via the |
230 |
< |
* <tt>Iterator.remove</tt>, <tt>Set.remove</tt>, |
231 |
< |
* <tt>removeAll</tt>, <tt>retainAll</tt> and <tt>clear</tt> |
232 |
< |
* operations. It does not support the <tt>add</tt> or |
233 |
< |
* <tt>addAll</tt> operations. |
230 |
> |
* {@code Iterator.remove}, {@code Set.remove}, |
231 |
> |
* {@code removeAll}, {@code retainAll} and {@code clear} |
232 |
> |
* operations. It does not support the {@code add} or |
233 |
> |
* {@code addAll} operations. |
234 |
|
* |
235 |
< |
* @return a set view of the mappings contained in this map. |
235 |
> |
* @return a set view of the mappings contained in this map |
236 |
|
*/ |
237 |
< |
Set<Map.Entry<K, V>> descendingEntrySet(); |
237 |
> |
Set<Map.Entry<K,V>> descendingEntrySet(); |
238 |
|
|
239 |
|
/** |
240 |
|
* Returns a view of the portion of this map whose keys range from |
241 |
< |
* <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive. (If |
242 |
< |
* <tt>fromKey</tt> and <tt>toKey</tt> are equal, the returned sorted map |
241 |
> |
* {@code fromKey}, inclusive, to {@code toKey}, exclusive. (If |
242 |
> |
* {@code fromKey} and {@code toKey} are equal, the returned sorted map |
243 |
|
* is empty.) The returned sorted map is backed by this map, so changes |
244 |
|
* in the returned sorted map are reflected in this map, and vice-versa. |
245 |
|
* |
246 |
< |
* @param fromKey low endpoint (inclusive) of the subMap. |
247 |
< |
* @param toKey high endpoint (exclusive) of the subMap. |
246 |
> |
* @param fromKey low endpoint (inclusive) of the subMap |
247 |
> |
* @param toKey high endpoint (exclusive) of the subMap |
248 |
|
* |
249 |
|
* @return a view of the portion of this map whose keys range from |
250 |
< |
* <tt>fromKey</tt>, inclusive, to <tt>toKey</tt>, exclusive. |
250 |
> |
* {@code fromKey}, inclusive, to {@code toKey}, exclusive |
251 |
|
* |
252 |
< |
* @throws ClassCastException if <tt>fromKey</tt> and |
253 |
< |
* <tt>toKey</tt> cannot be compared to one another using this |
252 |
> |
* @throws ClassCastException if {@code fromKey} and |
253 |
> |
* {@code toKey} cannot be compared to one another using this |
254 |
|
* map's comparator (or, if the map has no comparator, using |
255 |
< |
* natural ordering). |
256 |
< |
* @throws IllegalArgumentException if <tt>fromKey</tt> is greater |
257 |
< |
* than <tt>toKey</tt>. |
258 |
< |
* @throws NullPointerException if <tt>fromKey</tt> or |
259 |
< |
* <tt>toKey</tt> is <tt>null</tt> and this map does not support |
260 |
< |
* <tt>null</tt> keys. |
255 |
> |
* natural ordering) |
256 |
> |
* @throws IllegalArgumentException if {@code fromKey} is greater |
257 |
> |
* than {@code toKey} |
258 |
> |
* @throws NullPointerException if {@code fromKey} or |
259 |
> |
* {@code toKey} is {@code null} and this map does not support |
260 |
> |
* {@code null} keys |
261 |
|
*/ |
262 |
|
public NavigableMap<K,V> subMap(K fromKey, K toKey); |
263 |
|
|
264 |
|
/** |
265 |
|
* Returns a view of the portion of this map whose keys are strictly less |
266 |
< |
* than <tt>toKey</tt>. The returned sorted map is backed by this map, so |
266 |
> |
* than {@code toKey}. The returned sorted map is backed by this map, so |
267 |
|
* changes in the returned sorted map are reflected in this map, and |
268 |
|
* vice-versa. |
269 |
< |
* @param toKey high endpoint (exclusive) of the headMap. |
269 |
> |
* @param toKey high endpoint (exclusive) of the headMap |
270 |
|
* @return a view of the portion of this map whose keys are strictly |
271 |
< |
* less than <tt>toKey</tt>. |
271 |
> |
* less than {@code toKey} |
272 |
|
* |
273 |
< |
* @throws ClassCastException if <tt>toKey</tt> is not compatible |
273 |
> |
* @throws ClassCastException if {@code toKey} is not compatible |
274 |
|
* with this map's comparator (or, if the map has no comparator, |
275 |
< |
* if <tt>toKey</tt> does not implement <tt>Comparable</tt>). |
276 |
< |
* @throws NullPointerException if <tt>toKey</tt> is <tt>null</tt> |
277 |
< |
* and this map does not support <tt>null</tt> keys. |
275 |
> |
* if {@code toKey} does not implement {@code Comparable}) |
276 |
> |
* @throws NullPointerException if {@code toKey} is {@code null} |
277 |
> |
* and this map does not support {@code null} keys |
278 |
|
*/ |
279 |
|
public NavigableMap<K,V> headMap(K toKey); |
280 |
|
|
281 |
|
/** |
282 |
|
* Returns a view of the portion of this map whose keys are |
283 |
< |
* greater than or equal to <tt>fromKey</tt>. The returned sorted |
283 |
> |
* greater than or equal to {@code fromKey}. The returned sorted |
284 |
|
* map is backed by this map, so changes in the returned sorted |
285 |
|
* map are reflected in this map, and vice-versa. |
286 |
< |
* @param fromKey low endpoint (inclusive) of the tailMap. |
286 |
> |
* @param fromKey low endpoint (inclusive) of the tailMap |
287 |
|
* @return a view of the portion of this map whose keys are greater |
288 |
< |
* than or equal to <tt>fromKey</tt>. |
289 |
< |
* @throws ClassCastException if <tt>fromKey</tt> is not compatible |
288 |
> |
* than or equal to {@code fromKey} |
289 |
> |
* @throws ClassCastException if {@code fromKey} is not compatible |
290 |
|
* with this map's comparator (or, if the map has no comparator, |
291 |
< |
* if <tt>fromKey</tt> does not implement <tt>Comparable</tt>). |
292 |
< |
* @throws NullPointerException if <tt>fromKey</tt> is <tt>null</tt> |
293 |
< |
* and this map does not support <tt>null</tt> keys. |
291 |
> |
* if {@code fromKey} does not implement {@code Comparable}) |
292 |
> |
* @throws NullPointerException if {@code fromKey} is {@code null} |
293 |
> |
* and this map does not support {@code null} keys |
294 |
|
*/ |
295 |
|
public NavigableMap<K,V> tailMap(K fromKey); |
296 |
|
} |