1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
---|
2 | // |
---|
3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
---|
4 | // you may not use this file except in compliance with the License. |
---|
5 | // You may obtain a copy of the License at |
---|
6 | // |
---|
7 | // http://www.apache.org/licenses/LICENSE-2.0 |
---|
8 | // |
---|
9 | // Unless required by applicable law or agreed to in writing, software |
---|
10 | // distributed under the License is distributed on an "AS IS" BASIS, |
---|
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
---|
12 | // See the License for the specific language governing permissions and |
---|
13 | // limitations under the License. |
---|
14 | |
---|
15 | package de.ugoe.cs.autoquest.tasktrees.temporalrelation; |
---|
16 | |
---|
17 | import java.io.Serializable; |
---|
18 | import java.util.ArrayList; |
---|
19 | import java.util.Arrays; |
---|
20 | import java.util.Collection; |
---|
21 | import java.util.HashMap; |
---|
22 | import java.util.Iterator; |
---|
23 | import java.util.LinkedList; |
---|
24 | import java.util.List; |
---|
25 | import java.util.Map; |
---|
26 | import java.util.Map.Entry; |
---|
27 | |
---|
28 | import de.ugoe.cs.autoquest.eventcore.Event; |
---|
29 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTaskInstance; |
---|
30 | import de.ugoe.cs.autoquest.tasktrees.treeifc.IIterationInstance; |
---|
31 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISelectionInstance; |
---|
32 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequenceInstance; |
---|
33 | import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance; |
---|
34 | import de.ugoe.cs.autoquest.usageprofiles.SymbolMap; |
---|
35 | |
---|
36 | /** |
---|
37 | * <p> |
---|
38 | * This class is a data structure for holding task instances in form of a symbol map. It is more |
---|
39 | * efficient than a simple list. This data structure can be used with a comparator to adapt the |
---|
40 | * effective list behavior and to define the equals strategy for comparing task instances. After a |
---|
41 | * certain size ({@link #MAX_LIST_SIZE}), the map creates an index consisting of buckets of similar |
---|
42 | * task instances. This allows searching for task instances in a more efficient order as the search |
---|
43 | * can start in the most appropriate of the internal buckets. |
---|
44 | * </p> |
---|
45 | * <p> |
---|
46 | * The class is called a map, although it is not. It may contain the same task instances as |
---|
47 | * separate keys. This implementation is done for performance improvements. If it is required to |
---|
48 | * really assure, that a key exists only once, then each call to the |
---|
49 | * {@link #addSymbol(Object, Object)} method should be done only, if the |
---|
50 | * {@link #containsSymbol(Object)} method for the same symbol returns false. |
---|
51 | * </p> |
---|
52 | * |
---|
53 | * @see SymbolComparator |
---|
54 | * |
---|
55 | * @author Patrick Harms |
---|
56 | * @param <V> |
---|
57 | */ |
---|
58 | class TaskSymbolBucketedMap<V> implements SymbolMap<ITaskInstance, V>, Serializable { |
---|
59 | |
---|
60 | /** |
---|
61 | * <p> |
---|
62 | * default serial version UID |
---|
63 | * </p> |
---|
64 | */ |
---|
65 | private static final long serialVersionUID = 1L; |
---|
66 | |
---|
67 | /** |
---|
68 | * <p> |
---|
69 | * the maximum number of task instances in this map which is still only treated as list |
---|
70 | * instead of using buckets. |
---|
71 | * </p> |
---|
72 | */ |
---|
73 | private static final int MAX_LIST_SIZE = 15; |
---|
74 | |
---|
75 | /** |
---|
76 | * <p> |
---|
77 | * Comparator to be used for comparing the task instances with each other |
---|
78 | * </p> |
---|
79 | */ |
---|
80 | private TaskInstanceComparator comparator; |
---|
81 | |
---|
82 | /** |
---|
83 | * <p> |
---|
84 | * Internally maintained plain list of task instances and associated values |
---|
85 | * </p> |
---|
86 | */ |
---|
87 | private List<Map.Entry<ITaskInstance, V>> symbolList; |
---|
88 | |
---|
89 | /** |
---|
90 | * <p> |
---|
91 | * If the size of the map exceeds {@link #MAX_LIST_SIZE}, this is the index using buckets |
---|
92 | * for optimizing the search order. |
---|
93 | * </p> |
---|
94 | */ |
---|
95 | private Map<Integer, List<Map.Entry<ITaskInstance, V>>> symbolBuckets; |
---|
96 | |
---|
97 | /** |
---|
98 | * <p> |
---|
99 | * When using buckets, not any task instance may be associated a correct bucket. Therefore, we |
---|
100 | * set a default bucket for all such task instances. This may change if the same bucket for a |
---|
101 | * specific symbol is selected. |
---|
102 | * </p> |
---|
103 | */ |
---|
104 | private int defaultBucket = 0; |
---|
105 | |
---|
106 | /** |
---|
107 | * <p> |
---|
108 | * Instantiates a task instance map with a comparator |
---|
109 | * </p> |
---|
110 | * |
---|
111 | * @param comparator the comparator to use for comparing task instances |
---|
112 | * |
---|
113 | * @throws IllegalArgumentException if the provided comparator is null |
---|
114 | */ |
---|
115 | public TaskSymbolBucketedMap(TaskInstanceComparator comparator) { |
---|
116 | if (comparator == null) { |
---|
117 | throw new IllegalArgumentException("comparator must not be null"); |
---|
118 | } |
---|
119 | |
---|
120 | this.comparator = comparator; |
---|
121 | this.symbolList = new ArrayList<Map.Entry<ITaskInstance, V>>(); |
---|
122 | } |
---|
123 | |
---|
124 | /** |
---|
125 | * <p> |
---|
126 | * Copy constructor |
---|
127 | * </p> |
---|
128 | * |
---|
129 | * @param otherMap the other map to be copied including its comparator |
---|
130 | * |
---|
131 | * @throws IllegalArgumentException if the provided other map is null |
---|
132 | */ |
---|
133 | public TaskSymbolBucketedMap(TaskSymbolBucketedMap<V> otherMap) { |
---|
134 | if (otherMap == null) { |
---|
135 | throw new IllegalArgumentException("otherMap must not be null"); |
---|
136 | } |
---|
137 | |
---|
138 | this.comparator = otherMap.comparator; |
---|
139 | this.symbolList = new ArrayList<Map.Entry<ITaskInstance, V>>(otherMap.symbolList); |
---|
140 | |
---|
141 | if (this.symbolList.size() > MAX_LIST_SIZE) { |
---|
142 | createSymbolBuckets(); |
---|
143 | } |
---|
144 | } |
---|
145 | |
---|
146 | /** |
---|
147 | * <p> |
---|
148 | * Returns the size of the map, i.e. the number of task instance entries |
---|
149 | * </p> |
---|
150 | * |
---|
151 | * @return as described |
---|
152 | */ |
---|
153 | public int size() { |
---|
154 | return symbolList.size(); |
---|
155 | } |
---|
156 | |
---|
157 | /** |
---|
158 | * <p> |
---|
159 | * Returns true if this map is empty, i.e. if {@link #size()} returns 0 |
---|
160 | * </p> |
---|
161 | * |
---|
162 | * @return as described |
---|
163 | */ |
---|
164 | public boolean isEmpty() { |
---|
165 | return symbolList.isEmpty(); |
---|
166 | } |
---|
167 | |
---|
168 | /** |
---|
169 | * <p> |
---|
170 | * Returns true if the provided task instance was stored in this map. |
---|
171 | * </p> |
---|
172 | * |
---|
173 | * @param symbol the task instance to check if it was stored in this map |
---|
174 | * |
---|
175 | * @return as described |
---|
176 | * |
---|
177 | * @throws IllegalArgumentException if the provided task instance is null |
---|
178 | */ |
---|
179 | public boolean containsSymbol(ITaskInstance symbol) { |
---|
180 | if (symbol == null) { |
---|
181 | throw new IllegalArgumentException("symbol must not be null"); |
---|
182 | } |
---|
183 | |
---|
184 | return getEntry(symbol) != null; |
---|
185 | } |
---|
186 | |
---|
187 | /** |
---|
188 | * <p> |
---|
189 | * Returns the value associated to the provided task instance in this map. If there is no value |
---|
190 | * associated to the given task instance or if the task instance is not stored in this map, |
---|
191 | * the method returns null. |
---|
192 | * </p> |
---|
193 | * |
---|
194 | * @param symbol the task instance to return the value for |
---|
195 | * |
---|
196 | * @return as described |
---|
197 | * |
---|
198 | * @throws IllegalArgumentException if the provided task instance is null |
---|
199 | */ |
---|
200 | public V getValue(ITaskInstance symbol) { |
---|
201 | if (symbol == null) { |
---|
202 | throw new IllegalArgumentException("symbol must not be null"); |
---|
203 | } |
---|
204 | |
---|
205 | Map.Entry<ITaskInstance, V> entry = getEntry(symbol); |
---|
206 | |
---|
207 | if (entry != null) { |
---|
208 | return entry.getValue(); |
---|
209 | } |
---|
210 | else { |
---|
211 | return null; |
---|
212 | } |
---|
213 | } |
---|
214 | |
---|
215 | /** |
---|
216 | * <p> |
---|
217 | * Adds a task instance and an associated value to the map. If the value is null, the task |
---|
218 | * instance is added, anyway and {@link #containsSymbol(Object)} will return true for that |
---|
219 | * task instance. Adding the same task instance twice will produce two entries. This is |
---|
220 | * contradictory to typical map implementations. To prevent this, the |
---|
221 | * {@link #containsSymbol(Object)} and {@link #removeSymbol(Object)} methods should be used to |
---|
222 | * ensure map behavior. |
---|
223 | * </p> |
---|
224 | * |
---|
225 | * @param symbol the task instance to add to the map |
---|
226 | * @param value the value to associate to the task instance in this map |
---|
227 | * |
---|
228 | * @return as described |
---|
229 | * |
---|
230 | * @throws IllegalArgumentException if the provided task instance is null |
---|
231 | */ |
---|
232 | public void addSymbol(ITaskInstance symbol, V value) { |
---|
233 | if (symbol == null) { |
---|
234 | throw new IllegalArgumentException("symbol must not be null"); |
---|
235 | } |
---|
236 | |
---|
237 | Map.Entry<ITaskInstance, V> entry = new SymbolMapEntry(symbol, value); |
---|
238 | |
---|
239 | symbolList.add(entry); |
---|
240 | |
---|
241 | if (symbolList.size() > MAX_LIST_SIZE) { |
---|
242 | if (symbolBuckets == null) { |
---|
243 | createSymbolBuckets(); |
---|
244 | } |
---|
245 | else { |
---|
246 | addToSymbolBucket(entry); |
---|
247 | } |
---|
248 | } |
---|
249 | } |
---|
250 | |
---|
251 | /** |
---|
252 | * <p> |
---|
253 | * Removes a task instance and its associated value from the map. If the task instance is |
---|
254 | * stored several times, only the first of its occurrences is removed. |
---|
255 | * </p> |
---|
256 | * |
---|
257 | * @param symbol the task instance to be removed from the map |
---|
258 | * |
---|
259 | * @return as described |
---|
260 | * |
---|
261 | * @throws IllegalArgumentException if the provided task instance is null |
---|
262 | */ |
---|
263 | public V removeSymbol(ITaskInstance symbol) { |
---|
264 | if (symbol == null) { |
---|
265 | throw new IllegalArgumentException("symbol must not be null"); |
---|
266 | } |
---|
267 | |
---|
268 | for (int i = 0; i < symbolList.size(); i++) { |
---|
269 | if (comparator.equals(symbolList.get(i).getKey(), symbol)) { |
---|
270 | // found the symbol. Remove it from the list, and if required, also from the map. |
---|
271 | V value = symbolList.remove(i).getValue(); |
---|
272 | |
---|
273 | if (symbolList.size() > MAX_LIST_SIZE) { |
---|
274 | removeFromSymbolBuckets(symbol); |
---|
275 | } |
---|
276 | |
---|
277 | return value; |
---|
278 | } |
---|
279 | } |
---|
280 | |
---|
281 | return null; |
---|
282 | } |
---|
283 | |
---|
284 | /** |
---|
285 | * <p> |
---|
286 | * Returns a collection of all task instances in this map. |
---|
287 | * </p> |
---|
288 | * |
---|
289 | * @return as described |
---|
290 | */ |
---|
291 | public Collection<ITaskInstance> getSymbols() { |
---|
292 | return new ReadOnlyCollectionFacade<ITaskInstance>(symbolList, new SymbolFacade()); |
---|
293 | } |
---|
294 | |
---|
295 | /** |
---|
296 | * <p> |
---|
297 | * Returns a collection of all values associated to task instances in this map. May contain |
---|
298 | * null values, if some of the task instances are mapped to null. The length of the returned |
---|
299 | * collection is in any case the same as the size of the map. |
---|
300 | * </p> |
---|
301 | * |
---|
302 | * @return as described |
---|
303 | */ |
---|
304 | public Collection<V> getValues() { |
---|
305 | return new ReadOnlyCollectionFacade<V>(symbolList, new ValueFacade()); |
---|
306 | } |
---|
307 | |
---|
308 | /** |
---|
309 | * <p> |
---|
310 | * Removes all task instances and associated values from the map. |
---|
311 | * </p> |
---|
312 | */ |
---|
313 | public void clear() { |
---|
314 | symbolList.clear(); |
---|
315 | symbolBuckets = null; |
---|
316 | } |
---|
317 | |
---|
318 | /* (non-Javadoc) |
---|
319 | * @see java.lang.Object#hashCode() |
---|
320 | */ |
---|
321 | @Override |
---|
322 | public int hashCode() { |
---|
323 | return symbolList.size(); |
---|
324 | } |
---|
325 | |
---|
326 | /* (non-Javadoc) |
---|
327 | * @see java.lang.Object#equals(java.lang.Object) |
---|
328 | */ |
---|
329 | @SuppressWarnings("unchecked") |
---|
330 | @Override |
---|
331 | public boolean equals(Object obj) { |
---|
332 | if (this == obj) { |
---|
333 | return true; |
---|
334 | } |
---|
335 | else if (this.getClass().isInstance(obj)) { |
---|
336 | TaskSymbolBucketedMap<V> other = (TaskSymbolBucketedMap<V>) obj; |
---|
337 | |
---|
338 | return (symbolList.size() == other.symbolList.size()) && |
---|
339 | (symbolList.containsAll(other.symbolList)); |
---|
340 | } |
---|
341 | else { |
---|
342 | return false; |
---|
343 | } |
---|
344 | } |
---|
345 | |
---|
346 | /** |
---|
347 | * <p> |
---|
348 | * Internally used to create task instance buckets in case the number of stored task instances |
---|
349 | * increased above {@link #MAX_LIST_SIZE}. |
---|
350 | * </p> |
---|
351 | */ |
---|
352 | private void createSymbolBuckets() { |
---|
353 | //System.out.println("creating symbol buckets"); |
---|
354 | symbolBuckets = new HashMap<Integer, List<Map.Entry<ITaskInstance, V>>>(); |
---|
355 | |
---|
356 | for (Map.Entry<ITaskInstance, V> symbol : symbolList) { |
---|
357 | addToSymbolBucket(symbol); |
---|
358 | } |
---|
359 | } |
---|
360 | |
---|
361 | /** |
---|
362 | * <p> |
---|
363 | * Adds a task instance and its value to its corresponding bucket. The corresponding bucket is |
---|
364 | * the first element of the array returned by the method |
---|
365 | * {@link #getBucketSearchOrder(ITaskInstance)}. If no search order for a task instance is |
---|
366 | * defined, the entry is added to the default bucket. If the bucket id identical to the default |
---|
367 | * bucket id, the default bucket id is shifted to another value. |
---|
368 | * </p> |
---|
369 | */ |
---|
370 | private void addToSymbolBucket(Map.Entry<ITaskInstance, V> symbolEntry) { |
---|
371 | int bucketId = defaultBucket; |
---|
372 | int[] bucketSearchOrder = getBucketSearchOrder(symbolEntry.getKey()); |
---|
373 | |
---|
374 | if ((bucketSearchOrder != null) && (bucketSearchOrder.length > 0)) { |
---|
375 | bucketId = bucketSearchOrder[0]; |
---|
376 | |
---|
377 | if (bucketId == defaultBucket) { |
---|
378 | setNewDefaultBucketId(); |
---|
379 | } |
---|
380 | } |
---|
381 | |
---|
382 | List<Map.Entry<ITaskInstance, V>> list = symbolBuckets.get(bucketId); |
---|
383 | |
---|
384 | if (list == null) { |
---|
385 | list = new LinkedList<Map.Entry<ITaskInstance, V>>(); |
---|
386 | symbolBuckets.put(bucketId, list); |
---|
387 | } |
---|
388 | |
---|
389 | list.add(symbolEntry); |
---|
390 | } |
---|
391 | |
---|
392 | /** |
---|
393 | * <p> |
---|
394 | * returns the search order for a task instance which is different for event task instances, |
---|
395 | * sequence instances, selection instances, and iteration instances |
---|
396 | * </p> |
---|
397 | */ |
---|
398 | private int[] getBucketSearchOrder(ITaskInstance taskInstance) { |
---|
399 | // 0 = sequence; 1 = selection; 2 = iteration; 3 = optional; 4 = event task in general; |
---|
400 | // other = hashCode of name of event type |
---|
401 | |
---|
402 | if (taskInstance instanceof IEventTaskInstance) { |
---|
403 | // event tasks are most likely equal to those of the same type happening on the same |
---|
404 | // target. Afterwards, they should be equal to those of the event type with the same |
---|
405 | // name. Afterwards, they may be equal to iterations, optionals, other event tasks, |
---|
406 | // selections, and finally the rest. |
---|
407 | Event event = ((IEventTaskInstance) taskInstance).getEvent(); |
---|
408 | return new int[] { event.getTarget().hashCode() + event.getType().getName().hashCode(), |
---|
409 | event.getType().getName().hashCode(), 2, 3, 4, 1 }; |
---|
410 | } |
---|
411 | else if (taskInstance instanceof ISequenceInstance) { |
---|
412 | return new int[] { 0, 2, 3, 1 }; |
---|
413 | } |
---|
414 | else if (taskInstance instanceof ISelectionInstance) { |
---|
415 | return new int[] { 1, 4, 2, 3 }; |
---|
416 | } |
---|
417 | else if (taskInstance instanceof IIterationInstance) { |
---|
418 | return new int[] { 2, 1, 4 }; |
---|
419 | } |
---|
420 | |
---|
421 | return null; |
---|
422 | } |
---|
423 | |
---|
424 | /** |
---|
425 | * <p> |
---|
426 | * Removes the entry for a given task instance from the buckets. It uses the bucket search order |
---|
427 | * defined to find the task instance as fast as possible. |
---|
428 | * </p> |
---|
429 | */ |
---|
430 | private Map.Entry<ITaskInstance, V> removeFromSymbolBuckets(ITaskInstance symbol) { |
---|
431 | int bucketId = defaultBucket; |
---|
432 | int[] bucketSearchOrder = getBucketSearchOrder(symbol); |
---|
433 | |
---|
434 | if ((bucketSearchOrder != null) && (bucketSearchOrder.length > 0)) { |
---|
435 | bucketId = bucketSearchOrder[0]; |
---|
436 | } |
---|
437 | |
---|
438 | List<Map.Entry<ITaskInstance, V>> list = symbolBuckets.get(bucketId); |
---|
439 | Map.Entry<ITaskInstance, V> result = null; |
---|
440 | |
---|
441 | if (list != null) { |
---|
442 | for (int i = 0; i < list.size(); i++) { |
---|
443 | if (comparator.equals(list.get(i).getKey(), symbol)) { |
---|
444 | result = list.remove(i); |
---|
445 | break; |
---|
446 | } |
---|
447 | } |
---|
448 | |
---|
449 | if (list.isEmpty()) { |
---|
450 | symbolBuckets.remove(bucketId); |
---|
451 | } |
---|
452 | } |
---|
453 | |
---|
454 | return result; |
---|
455 | } |
---|
456 | |
---|
457 | /** |
---|
458 | * <p> |
---|
459 | * Updates the default bucket id to a new one |
---|
460 | * </p> |
---|
461 | */ |
---|
462 | private void setNewDefaultBucketId() { |
---|
463 | int oldDefaultBucket = defaultBucket; |
---|
464 | do { |
---|
465 | defaultBucket += 1; |
---|
466 | } |
---|
467 | while (symbolBuckets.containsKey(defaultBucket)); |
---|
468 | |
---|
469 | symbolBuckets.put(defaultBucket, symbolBuckets.remove(oldDefaultBucket)); |
---|
470 | } |
---|
471 | |
---|
472 | /** |
---|
473 | * <p> |
---|
474 | * searches for the entry belonging to the given task instance. The method either uses the |
---|
475 | * list if buckets are not used yet, or it uses the buckets and searches them in the order |
---|
476 | * defined by the method {@link #getBucketSearchOrder(ITaskInstance)}. If the task instances |
---|
477 | * isn't found and the bucket search order does not refer all buckets, then also the other |
---|
478 | * buckets are searched for the task instance. |
---|
479 | * </p> |
---|
480 | */ |
---|
481 | private Map.Entry<ITaskInstance, V> getEntry(ITaskInstance symbol) { |
---|
482 | Map.Entry<ITaskInstance, V> entry = null; |
---|
483 | if (symbolBuckets == null) { |
---|
484 | entry = lookup(symbol, symbolList); |
---|
485 | } |
---|
486 | else { |
---|
487 | int[] bucketSearchOrder = getBucketSearchOrder(symbol); |
---|
488 | for (int bucketId : bucketSearchOrder) { |
---|
489 | List<Map.Entry<ITaskInstance, V>> list = symbolBuckets.get(bucketId); |
---|
490 | if (list != null) { |
---|
491 | entry = lookup(symbol, list); |
---|
492 | if (entry != null) { |
---|
493 | break; |
---|
494 | } |
---|
495 | } |
---|
496 | } |
---|
497 | |
---|
498 | // try to search the other buckets |
---|
499 | if (entry == null) { |
---|
500 | Arrays.sort(bucketSearchOrder); |
---|
501 | for (Map.Entry<Integer, List<Map.Entry<ITaskInstance, V>>> bucket : symbolBuckets.entrySet()) { |
---|
502 | if (Arrays.binarySearch(bucketSearchOrder, bucket.getKey()) < 0) { |
---|
503 | List<Map.Entry<ITaskInstance, V>> list = bucket.getValue(); |
---|
504 | if (list != null) { |
---|
505 | entry = lookup(symbol, list); |
---|
506 | if (entry != null) { |
---|
507 | break; |
---|
508 | } |
---|
509 | } |
---|
510 | } |
---|
511 | } |
---|
512 | } |
---|
513 | } |
---|
514 | |
---|
515 | return entry; |
---|
516 | } |
---|
517 | |
---|
518 | /** |
---|
519 | * <p> |
---|
520 | * Convenience method to look up a symbol in a list of entries using the comparator. |
---|
521 | * </p> |
---|
522 | */ |
---|
523 | private Map.Entry<ITaskInstance, V> lookup(ITaskInstance symbol, List<Map.Entry<ITaskInstance, V>> list) { |
---|
524 | for (Map.Entry<ITaskInstance, V> candidate : list) { |
---|
525 | if (comparator.equals(candidate.getKey(), symbol)) { |
---|
526 | return candidate; |
---|
527 | } |
---|
528 | } |
---|
529 | |
---|
530 | return null; |
---|
531 | } |
---|
532 | |
---|
533 | /** |
---|
534 | * <p> |
---|
535 | * Internally used data structure for storing task instance - value pairs |
---|
536 | * </p> |
---|
537 | * |
---|
538 | * @author Patrick Harms |
---|
539 | */ |
---|
540 | private class SymbolMapEntry implements Map.Entry<ITaskInstance, V> { |
---|
541 | |
---|
542 | /** |
---|
543 | * the task instance to map to a value |
---|
544 | */ |
---|
545 | private ITaskInstance symbol; |
---|
546 | |
---|
547 | /** |
---|
548 | * the value associated with the symbol |
---|
549 | */ |
---|
550 | private V value; |
---|
551 | |
---|
552 | /** |
---|
553 | * <p> |
---|
554 | * Simple constructor for initializing the entry with a task instance and its associated |
---|
555 | * value. |
---|
556 | * </p> |
---|
557 | */ |
---|
558 | private SymbolMapEntry(ITaskInstance symbol, V value) { |
---|
559 | super(); |
---|
560 | this.symbol = symbol; |
---|
561 | this.value = value; |
---|
562 | } |
---|
563 | |
---|
564 | /* (non-Javadoc) |
---|
565 | * @see java.util.Map.Entry#getKey() |
---|
566 | */ |
---|
567 | @Override |
---|
568 | public ITaskInstance getKey() { |
---|
569 | return symbol; |
---|
570 | } |
---|
571 | |
---|
572 | /* (non-Javadoc) |
---|
573 | * @see java.util.Map.Entry#getValue() |
---|
574 | */ |
---|
575 | @Override |
---|
576 | public V getValue() { |
---|
577 | return value; |
---|
578 | } |
---|
579 | |
---|
580 | /* (non-Javadoc) |
---|
581 | * @see java.util.Map.Entry#setValue(java.lang.Object) |
---|
582 | */ |
---|
583 | @Override |
---|
584 | public V setValue(V value) { |
---|
585 | V oldValue = this.value; |
---|
586 | this.value = value; |
---|
587 | return oldValue; |
---|
588 | } |
---|
589 | |
---|
590 | /* (non-Javadoc) |
---|
591 | * @see java.lang.Object#hashCode() |
---|
592 | */ |
---|
593 | @Override |
---|
594 | public int hashCode() { |
---|
595 | return symbol.hashCode(); |
---|
596 | } |
---|
597 | |
---|
598 | /* (non-Javadoc) |
---|
599 | * @see java.lang.Object#equals(java.lang.Object) |
---|
600 | */ |
---|
601 | @SuppressWarnings("unchecked") |
---|
602 | @Override |
---|
603 | public boolean equals(Object obj) { |
---|
604 | if (this == obj) { |
---|
605 | return true; |
---|
606 | } |
---|
607 | else if (this.getClass().isInstance(obj)) { |
---|
608 | SymbolMapEntry other = (SymbolMapEntry) obj; |
---|
609 | return (symbol.equals(other.symbol) && |
---|
610 | (value == null ? other.value == null : value.equals(other.value))); |
---|
611 | } |
---|
612 | else { |
---|
613 | return false; |
---|
614 | } |
---|
615 | } |
---|
616 | |
---|
617 | /* (non-Javadoc) |
---|
618 | * @see java.lang.Object#toString() |
---|
619 | */ |
---|
620 | @Override |
---|
621 | public String toString() { |
---|
622 | return symbol + "=" + value; |
---|
623 | } |
---|
624 | |
---|
625 | } |
---|
626 | |
---|
627 | /** |
---|
628 | * <p> |
---|
629 | * Used to create an efficient facade for accessing the internal list of entries either only |
---|
630 | * for the task instances or only for the values. It is a default implementation of the |
---|
631 | * collection interface. The entry facade provided to the constructor decides, if either the |
---|
632 | * list accesses only the task instances or only the values. |
---|
633 | * </p> |
---|
634 | * |
---|
635 | * @author Patrick Harms |
---|
636 | */ |
---|
637 | private class ReadOnlyCollectionFacade<TYPE> implements Collection<TYPE> { |
---|
638 | |
---|
639 | /** |
---|
640 | * the list facaded by this facade |
---|
641 | */ |
---|
642 | private List<Map.Entry<ITaskInstance, V>> list; |
---|
643 | |
---|
644 | /** |
---|
645 | * the facade to be used for the entries |
---|
646 | */ |
---|
647 | private EntryFacade<TYPE> entryFacade; |
---|
648 | |
---|
649 | /** |
---|
650 | * <p> |
---|
651 | * Initializes the facade with the facaded list and the facade to be used for the entries |
---|
652 | * </p> |
---|
653 | */ |
---|
654 | private ReadOnlyCollectionFacade(List<Map.Entry<ITaskInstance, V>> list, |
---|
655 | EntryFacade<TYPE> entryFacade) |
---|
656 | { |
---|
657 | this.list = list; |
---|
658 | this.entryFacade = entryFacade; |
---|
659 | } |
---|
660 | |
---|
661 | /* (non-Javadoc) |
---|
662 | * @see java.util.Collection#size() |
---|
663 | */ |
---|
664 | @Override |
---|
665 | public int size() { |
---|
666 | return list.size(); |
---|
667 | } |
---|
668 | |
---|
669 | /* (non-Javadoc) |
---|
670 | * @see java.util.Collection#isEmpty() |
---|
671 | */ |
---|
672 | @Override |
---|
673 | public boolean isEmpty() { |
---|
674 | return list.isEmpty(); |
---|
675 | } |
---|
676 | |
---|
677 | /* (non-Javadoc) |
---|
678 | * @see java.util.Collection#contains(java.lang.Object) |
---|
679 | */ |
---|
680 | @Override |
---|
681 | public boolean contains(Object o) { |
---|
682 | if (o == null) { |
---|
683 | for (Map.Entry<ITaskInstance, V> entry : list) { |
---|
684 | if (entryFacade.getFacadedElement(entry) == null) { |
---|
685 | return true; |
---|
686 | } |
---|
687 | } |
---|
688 | } |
---|
689 | else { |
---|
690 | for (Map.Entry<ITaskInstance, V> entry : list) { |
---|
691 | if (o.equals(entryFacade.getFacadedElement(entry))) { |
---|
692 | return true; |
---|
693 | } |
---|
694 | } |
---|
695 | } |
---|
696 | |
---|
697 | return false; |
---|
698 | } |
---|
699 | |
---|
700 | /* (non-Javadoc) |
---|
701 | * @see java.util.Collection#toArray() |
---|
702 | */ |
---|
703 | @Override |
---|
704 | public Object[] toArray() { |
---|
705 | Object[] result = new Object[list.size()]; |
---|
706 | |
---|
707 | for (int i = 0; i < list.size(); i++) { |
---|
708 | result[i] = entryFacade.getFacadedElement(list.get(i)); |
---|
709 | } |
---|
710 | |
---|
711 | return result; |
---|
712 | } |
---|
713 | |
---|
714 | /* (non-Javadoc) |
---|
715 | * @see java.util.Collection#toArray(T[]) |
---|
716 | */ |
---|
717 | @SuppressWarnings("unchecked") |
---|
718 | @Override |
---|
719 | public <T> T[] toArray(T[] a) { |
---|
720 | T[] result = a; |
---|
721 | |
---|
722 | for (int i = 0; i < list.size(); i++) { |
---|
723 | result[i] = (T) entryFacade.getFacadedElement(list.get(i)); |
---|
724 | } |
---|
725 | |
---|
726 | return result; |
---|
727 | } |
---|
728 | |
---|
729 | /* (non-Javadoc) |
---|
730 | * @see java.util.Collection#add(java.lang.Object) |
---|
731 | */ |
---|
732 | @Override |
---|
733 | public boolean add(TYPE e) { |
---|
734 | throw new UnsupportedOperationException("this collection is read only"); |
---|
735 | } |
---|
736 | |
---|
737 | /* (non-Javadoc) |
---|
738 | * @see java.util.Collection#remove(java.lang.Object) |
---|
739 | */ |
---|
740 | @Override |
---|
741 | public boolean remove(Object o) { |
---|
742 | throw new UnsupportedOperationException("this collection is read only"); |
---|
743 | } |
---|
744 | |
---|
745 | /* (non-Javadoc) |
---|
746 | * @see java.util.Collection#containsAll(java.util.Collection) |
---|
747 | */ |
---|
748 | @Override |
---|
749 | public boolean containsAll(Collection<?> c) { |
---|
750 | for (Object candidate : c) { |
---|
751 | if (!contains(candidate)) { |
---|
752 | return false; |
---|
753 | } |
---|
754 | } |
---|
755 | |
---|
756 | return true; |
---|
757 | } |
---|
758 | |
---|
759 | /* (non-Javadoc) |
---|
760 | * @see java.util.Collection#addAll(java.util.Collection) |
---|
761 | */ |
---|
762 | @Override |
---|
763 | public boolean addAll(Collection<? extends TYPE> c) { |
---|
764 | throw new UnsupportedOperationException("this collection is read only"); |
---|
765 | } |
---|
766 | |
---|
767 | /* (non-Javadoc) |
---|
768 | * @see java.util.Collection#removeAll(java.util.Collection) |
---|
769 | */ |
---|
770 | @Override |
---|
771 | public boolean removeAll(Collection<?> c) { |
---|
772 | throw new UnsupportedOperationException("this collection is read only"); |
---|
773 | } |
---|
774 | |
---|
775 | /* (non-Javadoc) |
---|
776 | * @see java.util.Collection#retainAll(java.util.Collection) |
---|
777 | */ |
---|
778 | @Override |
---|
779 | public boolean retainAll(Collection<?> c) { |
---|
780 | throw new UnsupportedOperationException("this collection is read only"); |
---|
781 | } |
---|
782 | |
---|
783 | /* (non-Javadoc) |
---|
784 | * @see java.util.Collection#clear() |
---|
785 | */ |
---|
786 | @Override |
---|
787 | public void clear() { |
---|
788 | throw new UnsupportedOperationException("this collection is read only"); |
---|
789 | } |
---|
790 | |
---|
791 | /* (non-Javadoc) |
---|
792 | * @see java.util.Collection#iterator() |
---|
793 | */ |
---|
794 | @Override |
---|
795 | public Iterator<TYPE> iterator() { |
---|
796 | return new ReadOnlyCollectionIteratorFacade<TYPE>(list.iterator(), entryFacade); |
---|
797 | } |
---|
798 | |
---|
799 | } |
---|
800 | |
---|
801 | /** |
---|
802 | * <p> |
---|
803 | * Implementation of an iterator to facade an iterator on the internal list of task instance |
---|
804 | * entries. |
---|
805 | * </p> |
---|
806 | * |
---|
807 | * @author Patrick Harms |
---|
808 | */ |
---|
809 | private class ReadOnlyCollectionIteratorFacade<TYPE> implements Iterator<TYPE> { |
---|
810 | |
---|
811 | /** |
---|
812 | * the facaded iterator |
---|
813 | */ |
---|
814 | private Iterator<Map.Entry<ITaskInstance, V>> iterator; |
---|
815 | |
---|
816 | /** |
---|
817 | * the facade for the entries provided by the facaded iterator |
---|
818 | */ |
---|
819 | private EntryFacade<TYPE> entryFacade; |
---|
820 | |
---|
821 | /** |
---|
822 | * <p> |
---|
823 | * initialized this facade with the facaded iterator and the entry facade to be used for |
---|
824 | * the entries. |
---|
825 | * </p> |
---|
826 | */ |
---|
827 | private ReadOnlyCollectionIteratorFacade(Iterator<Map.Entry<ITaskInstance, V>> iterator, |
---|
828 | EntryFacade<TYPE> entryFacade) |
---|
829 | { |
---|
830 | this.iterator = iterator; |
---|
831 | this.entryFacade = entryFacade; |
---|
832 | } |
---|
833 | |
---|
834 | /* (non-Javadoc) |
---|
835 | * @see java.util.Iterator#hasNext() |
---|
836 | */ |
---|
837 | @Override |
---|
838 | public boolean hasNext() { |
---|
839 | return iterator.hasNext(); |
---|
840 | } |
---|
841 | |
---|
842 | /* (non-Javadoc) |
---|
843 | * @see java.util.Iterator#next() |
---|
844 | */ |
---|
845 | @Override |
---|
846 | public TYPE next() { |
---|
847 | return entryFacade.getFacadedElement(iterator.next()); |
---|
848 | } |
---|
849 | |
---|
850 | /* (non-Javadoc) |
---|
851 | * @see java.util.Iterator#remove() |
---|
852 | */ |
---|
853 | @Override |
---|
854 | public void remove() { |
---|
855 | throw new UnsupportedOperationException("this iterator is read only"); |
---|
856 | } |
---|
857 | |
---|
858 | } |
---|
859 | |
---|
860 | /** |
---|
861 | * <p> |
---|
862 | * Used to facade task instance entries and to return only this part of an entry, that is |
---|
863 | * relevant. |
---|
864 | * </p> |
---|
865 | * |
---|
866 | * @author Patrick Harms |
---|
867 | */ |
---|
868 | private abstract class EntryFacade<T> { |
---|
869 | |
---|
870 | /** |
---|
871 | * <p> |
---|
872 | * Returns only the part of an entry that is relevant or required. |
---|
873 | * </p> |
---|
874 | * |
---|
875 | * @param entry of which the part shall be returned |
---|
876 | * |
---|
877 | * @return the part of the entry to be returned |
---|
878 | */ |
---|
879 | protected abstract T getFacadedElement(Entry<ITaskInstance, V> entry); |
---|
880 | |
---|
881 | } |
---|
882 | |
---|
883 | /** |
---|
884 | * <p> |
---|
885 | * Implementation of the entry facade returning the entries key, i.e. the symbol. |
---|
886 | * </p> |
---|
887 | * |
---|
888 | * @author Patrick Harms |
---|
889 | */ |
---|
890 | private class SymbolFacade extends EntryFacade<ITaskInstance> { |
---|
891 | |
---|
892 | /* (non-Javadoc) |
---|
893 | * @see ReadOnlyCollectionIteratorFacade#getFacadedElement(Entry) |
---|
894 | */ |
---|
895 | @Override |
---|
896 | protected ITaskInstance getFacadedElement(Entry<ITaskInstance, V> entry) { |
---|
897 | return entry.getKey(); |
---|
898 | } |
---|
899 | } |
---|
900 | |
---|
901 | /** |
---|
902 | * <p> |
---|
903 | * Implementation of the entry facade returning the entries value, i.e. the value associated to |
---|
904 | * the symbol. |
---|
905 | * </p> |
---|
906 | * |
---|
907 | * @author Patrick Harms |
---|
908 | */ |
---|
909 | private class ValueFacade extends EntryFacade<V> { |
---|
910 | |
---|
911 | /* (non-Javadoc) |
---|
912 | * @see ReadOnlyCollectionIteratorFacade#getFacadedElement(Entry) |
---|
913 | */ |
---|
914 | @Override |
---|
915 | protected V getFacadedElement(Entry<ITaskInstance, V> entry) { |
---|
916 | return entry.getValue(); |
---|
917 | } |
---|
918 | } |
---|
919 | |
---|
920 | } |
---|