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.usageprofiles;
|
---|
16 |
|
---|
17 | import java.io.Serializable;
|
---|
18 | import java.util.Collection;
|
---|
19 | import java.util.LinkedHashSet;
|
---|
20 | import java.util.LinkedList;
|
---|
21 | import java.util.List;
|
---|
22 |
|
---|
23 | import de.ugoe.cs.util.StringTools;
|
---|
24 |
|
---|
25 | import edu.uci.ics.jung.graph.DelegateTree;
|
---|
26 | import edu.uci.ics.jung.graph.Graph;
|
---|
27 | import edu.uci.ics.jung.graph.Tree;
|
---|
28 |
|
---|
29 | /**
|
---|
30 | * <p>
|
---|
31 | * This class implements a <it>trie</it>, i.e., a tree of sequences that the occurence of
|
---|
32 | * subsequences up to a predefined length. This length is the trie order.
|
---|
33 | * </p>
|
---|
34 | *
|
---|
35 | * @author Steffen Herbold, Patrick Harms
|
---|
36 | *
|
---|
37 | * @param <T>
|
---|
38 | * Type of the symbols that are stored in the trie.
|
---|
39 | *
|
---|
40 | * @see TrieNode
|
---|
41 | */
|
---|
42 | public class Trie<T> implements IDotCompatible, Serializable {
|
---|
43 |
|
---|
44 | /**
|
---|
45 | * <p>
|
---|
46 | * Id for object serialization.
|
---|
47 | * </p>
|
---|
48 | */
|
---|
49 | private static final long serialVersionUID = 1L;
|
---|
50 |
|
---|
51 | /**
|
---|
52 | * <p>
|
---|
53 | * Collection of all symbols occuring in the trie.
|
---|
54 | * </p>
|
---|
55 | */
|
---|
56 | private SymbolMap<T, T> knownSymbols;
|
---|
57 |
|
---|
58 | /**
|
---|
59 | * <p>
|
---|
60 | * Reference to the root of the trie.
|
---|
61 | * </p>
|
---|
62 | */
|
---|
63 | private final TrieNode<T> rootNode;
|
---|
64 |
|
---|
65 | /**
|
---|
66 | * <p>
|
---|
67 | * Comparator to be used for comparing the symbols with each other
|
---|
68 | * </p>
|
---|
69 | */
|
---|
70 | private SymbolComparator<T> comparator;
|
---|
71 |
|
---|
72 | /**
|
---|
73 | * <p>
|
---|
74 | * Contructor. Creates a new Trie with a {@link DefaultSymbolComparator}.
|
---|
75 | * </p>
|
---|
76 | */
|
---|
77 | public Trie() {
|
---|
78 | this(new DefaultSymbolComparator<T>());
|
---|
79 | }
|
---|
80 |
|
---|
81 | /**
|
---|
82 | * <p>
|
---|
83 | * Contructor. Creates a new Trie with that uses a specific {@link SymbolComparator}.
|
---|
84 | * </p>
|
---|
85 | */
|
---|
86 | public Trie(SymbolComparator<T> comparator) {
|
---|
87 | this.comparator = comparator;
|
---|
88 | rootNode = new TrieNode<T>(comparator);
|
---|
89 | knownSymbols = new SymbolMap<T, T>(this.comparator);
|
---|
90 | }
|
---|
91 |
|
---|
92 | /**
|
---|
93 | * <p>
|
---|
94 | * Copy-Constructor. Creates a new Trie as the copy of other. The other trie must not be null.
|
---|
95 | * </p>
|
---|
96 | *
|
---|
97 | * @param other
|
---|
98 | * Trie that is copied
|
---|
99 | */
|
---|
100 | public Trie(Trie<T> other) {
|
---|
101 | if (other == null) {
|
---|
102 | throw new IllegalArgumentException("other trie must not be null");
|
---|
103 | }
|
---|
104 | rootNode = new TrieNode<T>(other.rootNode);
|
---|
105 | knownSymbols = new SymbolMap<T, T>(other.knownSymbols);
|
---|
106 | comparator = other.comparator;
|
---|
107 | }
|
---|
108 |
|
---|
109 | /**
|
---|
110 | * <p>
|
---|
111 | * Returns a collection of all symbols occuring in the trie.
|
---|
112 | * </p>
|
---|
113 | *
|
---|
114 | * @return symbols occuring in the trie
|
---|
115 | */
|
---|
116 | public Collection<T> getKnownSymbols() {
|
---|
117 | return new LinkedHashSet<T>(knownSymbols.getSymbols());
|
---|
118 | }
|
---|
119 |
|
---|
120 | /**
|
---|
121 | * <p>
|
---|
122 | * Trains the current trie using the given sequence and adds all subsequences of length
|
---|
123 | * {@code maxOrder}.
|
---|
124 | * </p>
|
---|
125 | *
|
---|
126 | * @param sequence
|
---|
127 | * sequence whose subsequences are added to the trie
|
---|
128 | * @param maxOrder
|
---|
129 | * maximum length of the subsequences added to the trie
|
---|
130 | */
|
---|
131 | public void train(List<T> sequence, int maxOrder) {
|
---|
132 | if (maxOrder < 1) {
|
---|
133 | return;
|
---|
134 | }
|
---|
135 | IncompleteMemory<T> latestActions = new IncompleteMemory<T>(maxOrder);
|
---|
136 | int i = 0;
|
---|
137 | for (T currentEvent : sequence) {
|
---|
138 | latestActions.add(currentEvent);
|
---|
139 | addToKnownSymbols(currentEvent);
|
---|
140 | i++;
|
---|
141 | if (i >= maxOrder) {
|
---|
142 | add(latestActions.getLast(maxOrder));
|
---|
143 | }
|
---|
144 | }
|
---|
145 | int sequenceLength = sequence.size();
|
---|
146 | int startIndex = Math.max(0, sequenceLength - maxOrder + 1);
|
---|
147 | for (int j = startIndex; j < sequenceLength; j++) {
|
---|
148 | add(sequence.subList(j, sequenceLength));
|
---|
149 | }
|
---|
150 | }
|
---|
151 |
|
---|
152 | /**
|
---|
153 | * <p>
|
---|
154 | * Adds a given subsequence to the trie and increases the counters accordingly. NOTE: This
|
---|
155 | * method does not add the symbols to the list of known symbols. This is only ensured using
|
---|
156 | * the method {@link #train(List, int)}.
|
---|
157 | * </p>
|
---|
158 | *
|
---|
159 | * @param subsequence
|
---|
160 | * subsequence whose counters are increased
|
---|
161 | * @see TrieNode#add(List)
|
---|
162 | */
|
---|
163 | protected void add(List<T> subsequence) {
|
---|
164 | if (subsequence != null && !subsequence.isEmpty()) {
|
---|
165 | subsequence = new LinkedList<T>(subsequence); // defensive copy!
|
---|
166 | T firstSymbol = subsequence.get(0);
|
---|
167 | TrieNode<T> node = getChildCreate(firstSymbol);
|
---|
168 | node.add(subsequence);
|
---|
169 | }
|
---|
170 | }
|
---|
171 |
|
---|
172 | /**
|
---|
173 | * <p>
|
---|
174 | * Returns the child of the root node associated with the given symbol or creates it if it does
|
---|
175 | * not exist yet.
|
---|
176 | * </p>
|
---|
177 | *
|
---|
178 | * @param symbol
|
---|
179 | * symbol whose node is required
|
---|
180 | * @return node associated with the symbol
|
---|
181 | * @see TrieNode#getChildCreate(Object)
|
---|
182 | */
|
---|
183 | protected TrieNode<T> getChildCreate(T symbol) {
|
---|
184 | return rootNode.getChildCreate(symbol);
|
---|
185 | }
|
---|
186 |
|
---|
187 | /**
|
---|
188 | * <p>
|
---|
189 | * Returns the child of the root node associated with the given symbol or null if it does not
|
---|
190 | * exist.
|
---|
191 | * </p>
|
---|
192 | *
|
---|
193 | * @param symbol
|
---|
194 | * symbol whose node is required
|
---|
195 | * @return node associated with the symbol; null if no such node exists
|
---|
196 | * @see TrieNode#getChild(Object)
|
---|
197 | */
|
---|
198 | protected TrieNode<T> getChild(T symbol) {
|
---|
199 | return rootNode.getChild(symbol);
|
---|
200 | }
|
---|
201 |
|
---|
202 | /**
|
---|
203 | * <p>
|
---|
204 | * Returns the number of occurences of the given sequence.
|
---|
205 | * </p>
|
---|
206 | *
|
---|
207 | * @param sequence
|
---|
208 | * sequence whose number of occurences is required
|
---|
209 | * @return number of occurences of the sequence
|
---|
210 | */
|
---|
211 | public int getCount(List<T> sequence) {
|
---|
212 | int count = 0;
|
---|
213 | TrieNode<T> node = find(sequence);
|
---|
214 | if (node != null) {
|
---|
215 | count = node.getCount();
|
---|
216 | }
|
---|
217 | return count;
|
---|
218 | }
|
---|
219 |
|
---|
220 | /**
|
---|
221 | * <p>
|
---|
222 | * Returns the number of occurences of the given prefix and a symbol that follows it.<br>
|
---|
223 | * Convenience function to simplify usage of {@link #getCount(List)}.
|
---|
224 | * </p>
|
---|
225 | *
|
---|
226 | * @param sequence
|
---|
227 | * prefix of the sequence
|
---|
228 | * @param follower
|
---|
229 | * suffix of the sequence
|
---|
230 | * @return number of occurences of the sequence
|
---|
231 | * @see #getCount(List)
|
---|
232 | */
|
---|
233 | public int getCount(List<T> sequence, T follower) {
|
---|
234 | List<T> tmpSequence = new LinkedList<T>(sequence);
|
---|
235 | tmpSequence.add(follower);
|
---|
236 | return getCount(tmpSequence);
|
---|
237 |
|
---|
238 | }
|
---|
239 |
|
---|
240 | /**
|
---|
241 | * <p>
|
---|
242 | * Searches the trie for a given sequence and returns the node associated with the sequence or
|
---|
243 | * null if no such node is found.
|
---|
244 | * </p>
|
---|
245 | *
|
---|
246 | * @param sequence
|
---|
247 | * sequence that is searched for
|
---|
248 | * @return node associated with the sequence
|
---|
249 | * @see TrieNode#find(List)
|
---|
250 | */
|
---|
251 | public TrieNode<T> find(List<T> sequence) {
|
---|
252 | if (sequence == null || sequence.isEmpty()) {
|
---|
253 | return rootNode;
|
---|
254 | }
|
---|
255 | List<T> sequenceCopy = new LinkedList<T>(sequence);
|
---|
256 | TrieNode<T> result = null;
|
---|
257 | TrieNode<T> node = getChild(sequenceCopy.get(0));
|
---|
258 | if (node != null) {
|
---|
259 | sequenceCopy.remove(0);
|
---|
260 | result = node.find(sequenceCopy);
|
---|
261 | }
|
---|
262 | return result;
|
---|
263 | }
|
---|
264 |
|
---|
265 | /**
|
---|
266 | * <p>
|
---|
267 | * Returns a collection of all symbols that follow a given sequence in the trie. In case the
|
---|
268 | * sequence is not found or no symbols follow the sequence the result will be empty.
|
---|
269 | * </p>
|
---|
270 | *
|
---|
271 | * @param sequence
|
---|
272 | * sequence whose followers are returned
|
---|
273 | * @return symbols following the given sequence
|
---|
274 | * @see TrieNode#getFollowingSymbols()
|
---|
275 | */
|
---|
276 | public Collection<T> getFollowingSymbols(List<T> sequence) {
|
---|
277 | Collection<T> result = new LinkedList<T>();
|
---|
278 | TrieNode<T> node = find(sequence);
|
---|
279 | if (node != null) {
|
---|
280 | result = node.getFollowingSymbols();
|
---|
281 | }
|
---|
282 | return result;
|
---|
283 | }
|
---|
284 |
|
---|
285 | /**
|
---|
286 | * <p>
|
---|
287 | * Returns the longest suffix of the given context that is contained in the tree and whose
|
---|
288 | * children are leaves.
|
---|
289 | * </p>
|
---|
290 | *
|
---|
291 | * @param context
|
---|
292 | * context whose suffix is searched for
|
---|
293 | * @return longest suffix of the context
|
---|
294 | */
|
---|
295 | public List<T> getContextSuffix(List<T> context) {
|
---|
296 | List<T> contextSuffix;
|
---|
297 | if (context != null) {
|
---|
298 | contextSuffix = new LinkedList<T>(context); // defensive copy
|
---|
299 | }
|
---|
300 | else {
|
---|
301 | contextSuffix = new LinkedList<T>();
|
---|
302 | }
|
---|
303 | boolean suffixFound = false;
|
---|
304 |
|
---|
305 | while (!suffixFound) {
|
---|
306 | if (contextSuffix.isEmpty()) {
|
---|
307 | suffixFound = true; // suffix is the empty word
|
---|
308 | }
|
---|
309 | else {
|
---|
310 | TrieNode<T> node = find(contextSuffix);
|
---|
311 | if (node != null) {
|
---|
312 | if (!node.getFollowingSymbols().isEmpty()) {
|
---|
313 | suffixFound = true;
|
---|
314 | }
|
---|
315 | }
|
---|
316 | if (!suffixFound) {
|
---|
317 | contextSuffix.remove(0);
|
---|
318 | }
|
---|
319 | }
|
---|
320 | }
|
---|
321 |
|
---|
322 | return contextSuffix;
|
---|
323 | }
|
---|
324 |
|
---|
325 | /**
|
---|
326 | * <p>
|
---|
327 | * used to recursively process the trie. The provided processor will be called for any path
|
---|
328 | * through the tree. The processor may abort the processing through returns values of its
|
---|
329 | * {@link TrieProcessor#process(List, int)} method.
|
---|
330 | * </p>
|
---|
331 | *
|
---|
332 | * @param processor the processor to process the tree
|
---|
333 | */
|
---|
334 | public void process(TrieProcessor<T> processor) {
|
---|
335 | LinkedList<T> context = new LinkedList<T>();
|
---|
336 |
|
---|
337 | for (TrieNode<T> child : rootNode.getChildren()) {
|
---|
338 | if (!process(context, child, processor)) {
|
---|
339 | break;
|
---|
340 | }
|
---|
341 | }
|
---|
342 | }
|
---|
343 |
|
---|
344 | /**
|
---|
345 | * <p>
|
---|
346 | * processes a specific path by calling the provided processor. Furthermore, the method
|
---|
347 | * calls itself recursively for further subpaths.
|
---|
348 | * </p>
|
---|
349 | *
|
---|
350 | * @param context the context of the currently processed trie node, i.e. the preceeding
|
---|
351 | * symbols
|
---|
352 | * @param child the processed trie node
|
---|
353 | * @param processor the processor used for processing the trie
|
---|
354 | *
|
---|
355 | * @return true, if processing shall continue, false else
|
---|
356 | */
|
---|
357 | private boolean process(LinkedList<T> context,
|
---|
358 | TrieNode<T> node,
|
---|
359 | TrieProcessor<T> processor)
|
---|
360 | {
|
---|
361 | context.add(node.getSymbol());
|
---|
362 |
|
---|
363 | TrieProcessor.Result result = processor.process(context, node.getCount());
|
---|
364 |
|
---|
365 | if (result == TrieProcessor.Result.CONTINUE) {
|
---|
366 | for (TrieNode<T> child : node.getChildren()) {
|
---|
367 | if (!process(context, child, processor)) {
|
---|
368 | break;
|
---|
369 | }
|
---|
370 | }
|
---|
371 | }
|
---|
372 |
|
---|
373 | context.removeLast();
|
---|
374 |
|
---|
375 | return result != TrieProcessor.Result.BREAK;
|
---|
376 | }
|
---|
377 |
|
---|
378 | /**
|
---|
379 | * <p>
|
---|
380 | * returns a list of symbol sequences which have a minimal length and that occurred as often
|
---|
381 | * as defined by the given occurrence count. If the given occurrence count is smaller 1 then
|
---|
382 | * those sequences are returned, that occur most often. The resulting list is empty, if there
|
---|
383 | * is no symbol sequence with the minimal length or the provided number of occurrences.
|
---|
384 | * </p>
|
---|
385 | *
|
---|
386 | * @param minimalLength the minimal length of the returned sequences
|
---|
387 | * @param occurrenceCount the number of occurrences of the returned sequences
|
---|
388 | *
|
---|
389 | * @return as described
|
---|
390 | */
|
---|
391 | public Collection<List<T>> getSequencesWithOccurrenceCount(int minimalLength,
|
---|
392 | int occurrenceCount)
|
---|
393 | {
|
---|
394 | LinkedList<TrieNode<T>> context = new LinkedList<TrieNode<T>>();
|
---|
395 | Collection<List<TrieNode<T>>> paths = new LinkedList<List<TrieNode<T>>>();
|
---|
396 |
|
---|
397 | context.push(rootNode);
|
---|
398 |
|
---|
399 | // traverse the trie and determine all sequences, which have the provided number of
|
---|
400 | // occurrences and a minimal length.
|
---|
401 |
|
---|
402 | // minimalLength + 1 because we denote the depth including the root node
|
---|
403 | determineLongPathsWithMostOccurrences(minimalLength + 1, occurrenceCount, paths, context);
|
---|
404 |
|
---|
405 | Collection<List<T>> resultingPaths = new LinkedList<List<T>>();
|
---|
406 | List<T> resultingPath;
|
---|
407 |
|
---|
408 | if (paths.size() > 0) {
|
---|
409 |
|
---|
410 | for (List<TrieNode<T>> path : paths) {
|
---|
411 | resultingPath = new LinkedList<T>();
|
---|
412 |
|
---|
413 | for (TrieNode<T> node : path) {
|
---|
414 | if (node.getSymbol() != null) {
|
---|
415 | resultingPath.add(node.getSymbol());
|
---|
416 | }
|
---|
417 | }
|
---|
418 |
|
---|
419 | resultingPaths.add(resultingPath);
|
---|
420 | }
|
---|
421 | }
|
---|
422 |
|
---|
423 | return resultingPaths;
|
---|
424 | }
|
---|
425 |
|
---|
426 | /**
|
---|
427 | * <p>
|
---|
428 | * Traverses the trie to collect all sequences with a defined number of occurrences and with
|
---|
429 | * a minimal length. If the given occurrence count is smaller 1 then those sequences are
|
---|
430 | * searched that occur most often. The length of the sequences is encoded in the provided
|
---|
431 | * recursion depth.
|
---|
432 | * </p>
|
---|
433 | *
|
---|
434 | * @param minimalDepth the minimal recursion depth to be done
|
---|
435 | * @param occurrenceCount the number of occurrences of the returned sequences
|
---|
436 | * @param paths the paths through the trie that all occurred with the same amount
|
---|
437 | * (if occurrence count is smaller 1, the paths which occurred most
|
---|
438 | * often) and that have the so far found matching number of occurrences
|
---|
439 | * (is updated each time a further path with the same number of
|
---|
440 | * occurrences is found; if occurrence count is smaller 1
|
---|
441 | * it is replaced if a path with more occurrences is found)
|
---|
442 | * @param context the path through the trie, that is analyzed by the recursive call
|
---|
443 | */
|
---|
444 | private void determineLongPathsWithMostOccurrences(int minimalDepth,
|
---|
445 | int occurrenceCount,
|
---|
446 | Collection<List<TrieNode<T>>> paths,
|
---|
447 | LinkedList<TrieNode<T>> context)
|
---|
448 | {
|
---|
449 | int envisagedCount = occurrenceCount;
|
---|
450 |
|
---|
451 | // only if we already reached the depth to be achieved, we check if the paths have the
|
---|
452 | // required number of occurrences
|
---|
453 | if (context.size() >= minimalDepth) {
|
---|
454 |
|
---|
455 | if (envisagedCount < 1) {
|
---|
456 | // try to determine the maximum number of occurrences so far, if any
|
---|
457 | if (paths.size() > 0) {
|
---|
458 | List<TrieNode<T>> path = paths.iterator().next();
|
---|
459 | envisagedCount = path.get(path.size() - 1).getCount();
|
---|
460 | }
|
---|
461 |
|
---|
462 | // if the current path has a higher number of occurrences than all so far, clear
|
---|
463 | // the paths collected so far and set the new number of occurrences as new maximum
|
---|
464 | if (context.getLast().getCount() > envisagedCount) {
|
---|
465 | paths.clear();
|
---|
466 | envisagedCount = context.getLast().getCount();
|
---|
467 | }
|
---|
468 | }
|
---|
469 |
|
---|
470 | // if the path matches the current maximal number of occurrences, add it to the list
|
---|
471 | // of collected paths with these number of occurrences
|
---|
472 | if (context.getLast().getCount() == envisagedCount) {
|
---|
473 | paths.add(new LinkedList<TrieNode<T>>(context));
|
---|
474 | }
|
---|
475 | }
|
---|
476 |
|
---|
477 | // perform the trie traversal
|
---|
478 | for (TrieNode<T> child : context.getLast().getChildren()) {
|
---|
479 | if (child.getCount() >= envisagedCount) {
|
---|
480 | context.add(child);
|
---|
481 | determineLongPathsWithMostOccurrences
|
---|
482 | (minimalDepth, occurrenceCount, paths, context);
|
---|
483 | context.removeLast();
|
---|
484 | }
|
---|
485 | }
|
---|
486 | }
|
---|
487 |
|
---|
488 | /**
|
---|
489 | * <p>
|
---|
490 | * adds a new symbol to the collection of known symbols if this symbol is not already
|
---|
491 | * contained. The symbols are compared using the comparator.
|
---|
492 | * </p>
|
---|
493 | *
|
---|
494 | * @param symbol the symbol to be added to the known symbols
|
---|
495 | */
|
---|
496 | private void addToKnownSymbols(T symbol) {
|
---|
497 | if (!knownSymbols.containsSymbol(symbol)) {
|
---|
498 | knownSymbols.addSymbol(symbol, symbol);
|
---|
499 | }
|
---|
500 | }
|
---|
501 |
|
---|
502 | /**
|
---|
503 | * <p>
|
---|
504 | * Helper class for graph visualization of a trie.
|
---|
505 | * </p>
|
---|
506 | *
|
---|
507 | * @author Steffen Herbold
|
---|
508 | * @version 1.0
|
---|
509 | */
|
---|
510 | static public class Edge {}
|
---|
511 |
|
---|
512 | /**
|
---|
513 | * <p>
|
---|
514 | * Helper class for graph visualization of a trie.
|
---|
515 | * </p>
|
---|
516 | *
|
---|
517 | * @author Steffen Herbold
|
---|
518 | * @version 1.0
|
---|
519 | */
|
---|
520 | static public class TrieVertex {
|
---|
521 |
|
---|
522 | /**
|
---|
523 | * <p>
|
---|
524 | * Id of the vertex.
|
---|
525 | * </p>
|
---|
526 | */
|
---|
527 | private String id;
|
---|
528 |
|
---|
529 | /**
|
---|
530 | * <p>
|
---|
531 | * Contructor. Creates a new TrieVertex.
|
---|
532 | * </p>
|
---|
533 | *
|
---|
534 | * @param id
|
---|
535 | * id of the vertex
|
---|
536 | */
|
---|
537 | protected TrieVertex(String id) {
|
---|
538 | this.id = id;
|
---|
539 | }
|
---|
540 |
|
---|
541 | /**
|
---|
542 | * <p>
|
---|
543 | * Returns the id of the vertex.
|
---|
544 | * </p>
|
---|
545 | *
|
---|
546 | * @see java.lang.Object#toString()
|
---|
547 | */
|
---|
548 | @Override
|
---|
549 | public String toString() {
|
---|
550 | return id;
|
---|
551 | }
|
---|
552 | }
|
---|
553 |
|
---|
554 | /**
|
---|
555 | * <p>
|
---|
556 | * Returns a {@link Graph} representation of the trie.
|
---|
557 | * </p>
|
---|
558 | *
|
---|
559 | * @return {@link Graph} representation of the trie
|
---|
560 | */
|
---|
561 | protected Tree<TrieVertex, Edge> getGraph() {
|
---|
562 | DelegateTree<TrieVertex, Edge> graph = new DelegateTree<TrieVertex, Edge>();
|
---|
563 | rootNode.getGraph(null, graph);
|
---|
564 | return graph;
|
---|
565 | }
|
---|
566 |
|
---|
567 | /*
|
---|
568 | * (non-Javadoc)
|
---|
569 | *
|
---|
570 | * @see de.ugoe.cs.autoquest.usageprofiles.IDotCompatible#getDotRepresentation()
|
---|
571 | */
|
---|
572 | public String getDotRepresentation() {
|
---|
573 | StringBuilder stringBuilder = new StringBuilder();
|
---|
574 | stringBuilder.append("digraph model {" + StringTools.ENDLINE);
|
---|
575 | rootNode.appendDotRepresentation(stringBuilder);
|
---|
576 | stringBuilder.append('}' + StringTools.ENDLINE);
|
---|
577 | return stringBuilder.toString();
|
---|
578 | }
|
---|
579 |
|
---|
580 | /**
|
---|
581 | * <p>
|
---|
582 | * Returns the string representation of the root node.
|
---|
583 | * </p>
|
---|
584 | *
|
---|
585 | * @see TrieNode#toString()
|
---|
586 | * @see java.lang.Object#toString()
|
---|
587 | */
|
---|
588 | @Override
|
---|
589 | public String toString() {
|
---|
590 | return rootNode.toString();
|
---|
591 | }
|
---|
592 |
|
---|
593 | /**
|
---|
594 | * <p>
|
---|
595 | * Returns the number of symbols contained in the trie.
|
---|
596 | * </p>
|
---|
597 | *
|
---|
598 | * @return number of symbols contained in the trie
|
---|
599 | */
|
---|
600 | public int getNumSymbols() {
|
---|
601 | return knownSymbols.size();
|
---|
602 | }
|
---|
603 |
|
---|
604 | /**
|
---|
605 | * <p>
|
---|
606 | * Returns the number of trie nodes that are ancestors of a leaf. This is the equivalent to the
|
---|
607 | * number of states a first-order markov model would have.
|
---|
608 | * <p>
|
---|
609 | *
|
---|
610 | * @return number of trie nodes that are ancestors of leafs.
|
---|
611 | */
|
---|
612 | public int getNumLeafAncestors() {
|
---|
613 | List<TrieNode<T>> ancestors = new LinkedList<TrieNode<T>>();
|
---|
614 | rootNode.getLeafAncestors(ancestors);
|
---|
615 | return ancestors.size();
|
---|
616 | }
|
---|
617 |
|
---|
618 | /**
|
---|
619 | * <p>
|
---|
620 | * Returns the number of trie nodes that are leafs.
|
---|
621 | * </p>
|
---|
622 | *
|
---|
623 | * @return number of leafs in the trie
|
---|
624 | */
|
---|
625 | public int getNumLeafs() {
|
---|
626 | return rootNode.getNumLeafs();
|
---|
627 | }
|
---|
628 |
|
---|
629 | /**
|
---|
630 | * <p>
|
---|
631 | * Updates the list of known symbols by replacing it with all symbols that are found in the
|
---|
632 | * child nodes of the root node. This should be the same as all symbols that are contained in
|
---|
633 | * the trie.
|
---|
634 | * </p>
|
---|
635 | */
|
---|
636 | public void updateKnownSymbols() {
|
---|
637 | knownSymbols = new SymbolMap<T, T>(this.comparator);
|
---|
638 | for (TrieNode<T> node : rootNode.getChildren()) {
|
---|
639 | addToKnownSymbols(node.getSymbol());
|
---|
640 | }
|
---|
641 | }
|
---|
642 |
|
---|
643 | /**
|
---|
644 | * <p>
|
---|
645 | * Two Tries are defined as equal, if their {@link #rootNode} are equal.
|
---|
646 | * </p>
|
---|
647 | *
|
---|
648 | * @see java.lang.Object#equals(java.lang.Object)
|
---|
649 | */
|
---|
650 | @SuppressWarnings("rawtypes")
|
---|
651 | @Override
|
---|
652 | public boolean equals(Object other) {
|
---|
653 | if (other == this) {
|
---|
654 | return true;
|
---|
655 | }
|
---|
656 | if (other instanceof Trie) {
|
---|
657 | return rootNode.equals(((Trie) other).rootNode);
|
---|
658 | }
|
---|
659 | return false;
|
---|
660 | }
|
---|
661 |
|
---|
662 | /*
|
---|
663 | * (non-Javadoc)
|
---|
664 | *
|
---|
665 | * @see java.lang.Object#hashCode()
|
---|
666 | */
|
---|
667 | @Override
|
---|
668 | public int hashCode() {
|
---|
669 | int multiplier = 17;
|
---|
670 | int hash = 42;
|
---|
671 | if (rootNode != null) {
|
---|
672 | hash = multiplier * hash + rootNode.hashCode();
|
---|
673 | }
|
---|
674 | return hash;
|
---|
675 | }
|
---|
676 |
|
---|
677 | }
|
---|