Source Code Cross Referenced for Language.java in  » IDE-Netbeans » lexer » org » netbeans » api » lexer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » lexer » org.netbeans.api.lexer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         *
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common
008:         * Development and Distribution License("CDDL") (collectively, the
009:         * "License"). You may not use this file except in compliance with the
010:         * License. You can obtain a copy of the License at
011:         * http://www.netbeans.org/cddl-gplv2.html
012:         * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013:         * specific language governing permissions and limitations under the
014:         * License.  When distributing the software, include this License Header
015:         * Notice in each file and include the License file at
016:         * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
017:         * particular file as subject to the "Classpath" exception as provided
018:         * by Sun in the GPL Version 2 section of the License file that
019:         * accompanied this code. If applicable, add the following below the
020:         * License Header, with the fields enclosed by brackets [] replaced by
021:         * your own identifying information:
022:         * "Portions Copyrighted [year] [name of copyright owner]"
023:         *
024:         * Contributor(s):
025:         *
026:         * The Original Software is NetBeans. The Initial Developer of the Original
027:         * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028:         * Microsystems, Inc. All Rights Reserved.
029:         *
030:         * If you wish your version of this file to be governed by only the CDDL
031:         * or only the GPL Version 2, indicate your decision by adding
032:         * "[Contributor] elects to include this software in this distribution
033:         * under the [CDDL or GPL Version 2] license." If you do not indicate a
034:         * single choice of license, a recipient has the option to distribute
035:         * your version of this file under either the CDDL, the GPL Version 2 or
036:         * to extend the choice of license to its licensees as provided above.
037:         * However, if you add GPL Version 2 code and therefore, elected the GPL
038:         * Version 2 license, then the option applies only if the new code is
039:         * made subject to such option by the copyright holder.
040:         */
041:
042:        package org.netbeans.api.lexer;
043:
044:        import java.util.ArrayList;
045:        import java.util.Collection;
046:        import java.util.Collections;
047:        import java.util.EnumSet;
048:        import java.util.Map;
049:        import java.util.HashMap;
050:        import java.util.List;
051:        import java.util.Set;
052:        import org.netbeans.lib.lexer.LanguageManager;
053:        import org.netbeans.lib.lexer.LanguageOperation;
054:        import org.netbeans.lib.lexer.LexerApiPackageAccessor;
055:        import org.netbeans.lib.lexer.LexerSpiPackageAccessor;
056:        import org.netbeans.lib.lexer.TokenIdSet;
057:        import org.netbeans.lib.lexer.TokenHierarchyOperation;
058:        import org.netbeans.lib.lexer.TokenList;
059:        import org.netbeans.lib.lexer.inc.TokenChangeInfo;
060:        import org.netbeans.lib.lexer.inc.TokenHierarchyEventInfo;
061:        import org.netbeans.lib.lexer.inc.TokenListChange;
062:        import org.netbeans.spi.lexer.LanguageHierarchy;
063:
064:        /**
065:         * Language describes a set of token ids
066:         * that comprise the given language.
067:         * <br/>
068:         * Each language corresponds to a certain mime-type.
069:         * <br/>
070:         * An input source may be lexed by using an existing language
071:         * - see {@link TokenHierarchy} which is an entry point into the Lexer API.
072:         * <br>
073:         * Language hierarchy is represented by an unmodifiable set of {@link TokenId}s
074:         * that can be retrieved by {@link #tokenIds()} and token categories
075:         * {@link #tokenCategories()}.
076:         *
077:         * <p>
078:         * The language cannot be instantiated directly.
079:         * <br/>
080:         * Instead it should be obtained from {@link LanguageHierarchy#language()}
081:         * on an existing language hierarchy.
082:         *
083:         * @see LanguageHierarchy
084:         * @see TokenId
085:         *
086:         * @author Miloslav Metelka
087:         * @version 1.00
088:         */
089:
090:        public final class Language<T extends TokenId> {
091:
092:            static {
093:                LexerApiPackageAccessor.register(new Accessor());
094:            }
095:
096:            private final LanguageHierarchy<T> languageHierarchy;
097:
098:            private final LanguageOperation<T> languageOperation;
099:
100:            private String mimeType;
101:
102:            private final int maxOrdinal;
103:
104:            private final Set<T> ids;
105:
106:            /** Lazily inited indexed ids for quick translation of ordinal to token id. */
107:            private TokenIdSet<T> indexedIds;
108:
109:            private final Map<String, T> idName2id;
110:
111:            /**
112:             * Map of category to ids that it contains.
113:             */
114:            private final Map<String, Set<T>> cat2ids;
115:
116:            /**
117:             * Lists of token categories for particular id.
118:             * <br/>
119:             * It's a list because it is ordered (primary category is first).
120:             */
121:            private List<String>[] id2cats;
122:
123:            /**
124:             * Lists of non-primary token categories for particular id.
125:             * <br/>
126:             * It's a list because the order might be important
127:             * (e.g. for syntax coloring information resolving) although
128:             * the present SPI does not utilize that.
129:             */
130:            private List<String>[] id2nonPrimaryCats;
131:
132:            /**
133:             * Finds a language by its mime type.
134:             * 
135:             * <p>This method uses information from <code>LanguageProvider</code>s registered
136:             * in the default lookup to find <code>Language</code> for a given
137:             * mime type.
138:             * 
139:             * <div class="nonnormative">
140:             * <p>Netbeans provide an implementation of <code>LanguageProvider</code>
141:             * that reads data from the <code>Editors</code> folder on the system filesystem.
142:             * Therefore Netbeans modules can register their <code>Language</code>s
143:             * in MimeLookup as any other mime-type related service.
144:             * 
145:             * @param mimeType The mime type of a language that you want to find.
146:             * @return The <code>Language</code> registered
147:             *         for the given <code>mimeType</code>.
148:             */
149:            public static Language<?> find(String mimeType) {
150:                return LanguageManager.getInstance().findLanguage(mimeType);
151:            }
152:
153:            /**
154:             * Construct language by providing a collection of token ids
155:             * that comprise the language and extra categories into which the token ids belong.
156:             *
157:             * @param languageHierarchy non-null language hierarchy is in one-to-one relationship
158:             *  with the language and represents it on SPI side.
159:             * @throws IndexOutOfBoundsException if any token id's ordinal is &lt; 0.
160:             */
161:            Language(LanguageHierarchy<T> languageHierarchy) {
162:                this .languageHierarchy = languageHierarchy;
163:                this .languageOperation = new LanguageOperation<T>(
164:                        languageHierarchy, this );
165:                mimeType = LexerSpiPackageAccessor.get().mimeType(
166:                        languageHierarchy);
167:                checkMimeTypeValid(mimeType);
168:                // Create ids and find max ordinal
169:                Collection<T> createdIds = LexerSpiPackageAccessor.get()
170:                        .createTokenIds(languageHierarchy);
171:                if (createdIds == null)
172:                    throw new IllegalArgumentException("Ids cannot be null"); // NOI18N
173:                maxOrdinal = TokenIdSet.findMaxOrdinal(createdIds);
174:
175:                // Convert collection of ids to efficient indexed Set<T>
176:                if (createdIds instanceof  EnumSet) {
177:                    ids = (Set<T>) createdIds;
178:                } else { // not EnumSet
179:                    ids = new TokenIdSet<T>(createdIds, maxOrdinal, true);
180:                }
181:
182:                // Create TokenIdSet instances for token categories
183:                Map<String, Collection<T>> createdCat2ids = LexerSpiPackageAccessor
184:                        .get().createTokenCategories(languageHierarchy);
185:                if (createdCat2ids == null) {
186:                    createdCat2ids = Collections.emptyMap();
187:                }
188:                cat2ids = new HashMap<String, Set<T>>((int) (createdCat2ids
189:                        .size() / 0.73f));
190:                for (Map.Entry<String, Collection<T>> entry : createdCat2ids
191:                        .entrySet()) {
192:                    Collection<T> createdCatIds = entry.getValue();
193:                    TokenIdSet.checkIdsFromLanguage(createdCatIds, ids);
194:                    // Do not use the original createdCatIds set because of the following:
195:                    // 1) Two token categories will have the same sets of contained ids
196:                    //   in the createdCatIds map (the same physical Set instance).
197:                    // 2) At least one token id will have one of the two categories
198:                    //   as its primary category.
199:                    // 3) If the original Set instance from the createdCatIds would be used
200:                    //   then both categories would incorrectly contain the extra id(s).
201:                    Set<T> catIds = new TokenIdSet<T>(createdCatIds,
202:                            maxOrdinal, false);
203:                    cat2ids.put(entry.getKey(), catIds);
204:                }
205:
206:                // Walk through all ids and check duplicate names and primary categories
207:                idName2id = new HashMap<String, T>((int) (ids.size() / 0.73f));
208:                for (T id : ids) {
209:                    T sameNameId = idName2id.put(id.name(), id);
210:                    if (sameNameId != null && sameNameId != id) { // token ids with same name
211:                        throw new IllegalArgumentException(id
212:                                + " has duplicate name with " + sameNameId);
213:                    }
214:
215:                    String cat = id.primaryCategory();
216:                    if (cat != null) {
217:                        Set<T> catIds = cat2ids.get(cat);
218:                        if (catIds == null) {
219:                            catIds = new TokenIdSet<T>(null, maxOrdinal, false);
220:                            cat2ids.put(cat, catIds);
221:                        }
222:                        catIds.add(id);
223:                    }
224:                }
225:            }
226:
227:            /**
228:             * Get unmodifiable set of ids contained in this language.
229:             * <br/>
230:             * An iterator over the set returns the ids sorted by their ordinals.
231:             *
232:             * @return unmodifiable set of ids contained in this language.
233:             */
234:            public Set<T> tokenIds() {
235:                return ids;
236:            }
237:
238:            /**
239:             * Get tokenId for the given ordinal. This method
240:             * can be used by lexers to quickly translate ordinal
241:             * to tokenId.
242:             * @param ordinal ordinal to be translated to corresponding tokenId.
243:             * @return valid tokenId or null if there's no corresponding
244:             *  tokenId for the given int-id. It's possible because intIds
245:             *  of the language's token ids do not need to be continuous.
246:             *  If the ordinal is &lt;0 or higher than the highest
247:             *  ordinal of all the token ids of this language the method
248:             *  throws {@link IndexOutOfBoundsException}.
249:             * @throws IndexOutOfBoundsException if the ordinal is
250:             *  &lt;0 or higher than {@link #maxOrdinal()}.
251:             */
252:            public T tokenId(int ordinal) {
253:                synchronized (idName2id) {
254:                    if (indexedIds == null) {
255:                        if (ids instanceof  EnumSet) {
256:                            indexedIds = new TokenIdSet<T>(ids, maxOrdinal,
257:                                    false);
258:                        } else { // not EnumSet
259:                            indexedIds = (TokenIdSet<T>) ids;
260:                        }
261:                    }
262:                    return indexedIds.indexedIds()[ordinal];
263:                }
264:            }
265:
266:            /**
267:             * Similar to {@link #tokenId(int)} however it guarantees
268:             * that it will always return non-null tokenId. Typically for a lexer 
269:             * just being developed it's possible that there are some integer
270:             * token ids defined in the generated lexer for which there is
271:             * no correspondence in the language. The lexer wrapper should
272:             * always call this method if it expects to find a valid
273:             * counterpart for given integer id.
274:             * @param ordinal ordinal to translate to token id.
275:             * @return always non-null tokenId that corresponds to the given integer id.
276:             * @throws IndexOutOfBoundsException if the ordinal is
277:             *  &lt;0 or higher than {@link #maxOrdinal()} or when there is no corresponding
278:             *  token id for it.
279:             */
280:            public T validTokenId(int ordinal) {
281:                T id = tokenId(ordinal);
282:                if (id == null) {
283:                    throw new IndexOutOfBoundsException(
284:                            "No tokenId for ordinal=" + ordinal
285:                                    + " in language " + this );
286:                }
287:                return id;
288:            }
289:
290:            /**
291:             * Find the tokenId from its name.
292:             * @param name name of the tokenId to find.
293:             * @return tokenId with the requested name or null if it does not exist.
294:             */
295:            public T tokenId(String name) {
296:                return idName2id.get(name);
297:            }
298:
299:            /**
300:             * Similar to {@link #tokenId(String)} but guarantees a valid tokenId to be returned.
301:             * @throws IllegalArgumentException if no token in this language has the given name.
302:             */
303:            public T validTokenId(String name) {
304:                T id = tokenId(name);
305:                if (id == null) {
306:                    throw new IllegalArgumentException("No tokenId for name=\""
307:                            + name + "\" in language " + this );
308:                }
309:                return id;
310:            }
311:
312:            /**
313:             * Get maximum ordinal of all the token ids that this language contains.
314:             * @return maximum integer ordinal of all the token ids that this language contains
315:             *  or <code>-1</code> if the language contains no token ids.
316:             */
317:            public int maxOrdinal() {
318:                return maxOrdinal;
319:            }
320:
321:            /**
322:             * Get names of all token categories of this language.
323:             *
324:             * @return unmodifiable set containing names of all token categories
325:             *  contained in this language.
326:             */
327:            public Set<String> tokenCategories() {
328:                return Collections.unmodifiableSet(cat2ids.keySet());
329:            }
330:
331:            /**
332:             * Get members of the category with given name.
333:             *
334:             * @param tokenCategory non-null name of the category.
335:             * @return set of token ids belonging to the given category.
336:             */
337:            public Set<T> tokenCategoryMembers(String tokenCategory) {
338:                return Collections.unmodifiableSet(cat2ids.get(tokenCategory));
339:            }
340:
341:            /**
342:             * Get list of all token categories for the particular token id.
343:             *
344:             * @return non-null unmodifiable list of all token categories for the particular token id.
345:             *  <br>
346:             *  Primary token's category (if defined for the token id) will be contained
347:             *  as first one in the list.
348:             * @throws IllegalArgumentException if the given token id does not belong
349:             *  to this language.
350:             */
351:            public List<String> tokenCategories(T tokenId) {
352:                checkMemberId(tokenId);
353:                synchronized (idName2id) {
354:                    if (id2cats == null) {
355:                        buildTokenIdCategories();
356:                    }
357:                    return id2cats[tokenId.ordinal()];
358:                }
359:            }
360:
361:            /**
362:             * Get list of non-primary token categories (not containing the primary category)
363:             * for the particular token id.
364:             * <br/>
365:             * If the token id has no primary category defined then the result
366:             * of this method is equal to {@link #tokenCategories(TokenId)}.
367:             *
368:             * @return non-null unmodifiable list of secondary token categories for the particular token id.
369:             *  Primary token's category (if defined for the token id) will not be contained
370:             *  in the list.
371:             * @throws IllegalArgumentException if the given token id does not belong
372:             *  to this language.
373:             */
374:            public List<String> nonPrimaryTokenCategories(T tokenId) {
375:                checkMemberId(tokenId);
376:                synchronized (idName2id) {
377:                    if (id2nonPrimaryCats == null) {
378:                        buildTokenIdCategories();
379:                    }
380:                    return id2nonPrimaryCats[tokenId.ordinal()];
381:                }
382:            }
383:
384:            /**
385:             * Merge two collections of token ids from this language
386:             * into an efficient indexed set (the implementation similar
387:             * to {@link java.util.EnumSet}).
388:             *
389:             * @param tokenIds1 non-null collection of token ids to be contained in the returned set.
390:             * @param tokenIds2 collection of token ids to be contained in the returned set.
391:             * @return set of token ids indexed by their ordinal number.
392:             */
393:            public Set<T> merge(Collection<T> tokenIds1, Collection<T> tokenIds2) {
394:                TokenIdSet.checkIdsFromLanguage(tokenIds1, ids);
395:                // Cannot retain EnumSet as tokenIds will already be wrapped
396:                // by unmodifiableSet()
397:                Set<T> ret = new TokenIdSet<T>(tokenIds1, maxOrdinal, false);
398:                if (tokenIds2 != null) {
399:                    TokenIdSet.checkIdsFromLanguage(tokenIds2, ids);
400:                    ret.addAll(tokenIds2);
401:                }
402:                return ret;
403:            }
404:
405:            /**
406:             * Gets the mime type of this language.
407:             *
408:             * @return non-null language's mime type.
409:             */
410:            public String mimeType() {
411:                return mimeType;
412:            }
413:
414:            /** The languages are equal only if they are the same objects. */
415:            public @Override
416:            boolean equals(Object obj) {
417:                return super .equals(obj);
418:            }
419:
420:            /** The hashCode of the language is the identity hashCode. */
421:            public @Override
422:            int hashCode() {
423:                return super .hashCode();
424:            }
425:
426:            private void buildTokenIdCategories() {
427:                assignCatArrays();
428:                // List for decreasing of the number of created maps
429:                // for tokenId2category mappings.
430:                // List.get(0) is a Map[category, list-of-[category]].
431:                // List.get(1) is a Map[category1, Map[category2, list-of-[category1;category2]]].
432:                // etc.
433:                List<Map<String, Object>> catMapsList = new ArrayList<Map<String, Object>>(
434:                        4);
435:                // All categories for a single token id
436:                List<String> idCats = new ArrayList<String>(4);
437:                for (T id : ids) {
438:                    // No extra sorting of the categories in which the particular id is contained
439:                    //  - making explicit order of the categories could possibly be acomplished
440:                    //    in the future if necessary by supporting some extra hints
441:                    // Add all the categories for the particular id into idCats
442:                    for (Map.Entry<String, Set<T>> e : cat2ids.entrySet()) {
443:                        if (e.getValue().contains(id)) {
444:                            idCats.add(e.getKey()); // Add this category to id's categories
445:                        }
446:                    }
447:                    // Assign both non-primary cats and all cats
448:                    id2cats[id.ordinal()] = findCatList(catMapsList, idCats, 0);
449:                    id2nonPrimaryCats[id.ordinal()] = findCatList(catMapsList,
450:                            idCats, 1);
451:
452:                    idCats.clear(); // reuse the list (is cloned if added to catMapsList)
453:                }
454:            }
455:
456:            /**
457:             * Find the cached list of categories from the catMapsList
458:             * for the particular temporarily collected list of categories.
459:             *
460:             * @param catMapsList non-null list of cached maps.
461:             *  <br/>
462:             *  List.get(0) is a Map[category, list-containing-[category]].
463:             *  <br/>
464:             *  List.get(1) is a Map[category1, Map[category2, list-containing-[category1;category2]]].
465:             *  <br/>
466:             *  etc.
467:             *
468:             * @param idCats non-null temporarily collected list of categories for the particular id.
469:             *  It may be modified after this method gets finished.
470:             * @param startIndex >=0 starting index in idCats - either 0 for returning
471:             * of all categories or 1 for returning non-primary categories.
472:             * @return non-null cached list of categories with contents equal to idCats.
473:             */
474:            private static List<String> findCatList(
475:                    List<Map<String, Object>> catMapsList, List<String> idCats,
476:                    int startIndex) {
477:                int size = idCats.size() - startIndex;
478:                if (size <= 0) {
479:                    return Collections.emptyList();
480:                }
481:                while (catMapsList.size() < size) {
482:                    catMapsList.add(new HashMap<String, Object>());
483:                }
484:                // Find the catList as the last item in the cascaded search through the maps
485:                Map<String, Object> m = catMapsList.get(--size);
486:                for (int i = startIndex; i < size; i++) {
487:                    @SuppressWarnings("unchecked")
488:                    Map<String, Object> catMap = (Map<String, Object>) m
489:                            .get(idCats.get(i));
490:                    if (catMap == null) {
491:                        catMap = new HashMap<String, Object>();
492:                        //                Map<String,Map<String,Object>> 
493:                        m.put(idCats.get(i), catMap);
494:                    }
495:                    m = catMap;
496:                }
497:
498:                @SuppressWarnings("unchecked")
499:                List<String> catList = (List<String>) m.get(idCats.get(size));
500:                if (catList == null) {
501:                    catList = new ArrayList<String>(idCats.size() - startIndex);
502:                    catList.addAll((startIndex > 0) ? idCats.subList(
503:                            startIndex, idCats.size()) : idCats);
504:                    m.put(idCats.get(size), catList);
505:                }
506:                return catList;
507:            }
508:
509:            @SuppressWarnings("unchecked")
510:            private void assignCatArrays() {
511:                id2cats = (List<String>[]) new List[maxOrdinal + 1];
512:                id2nonPrimaryCats = (List<String>[]) new List[maxOrdinal + 1];
513:            }
514:
515:            /**
516:             * Dump list of token ids for this language into string.
517:             *
518:             * @return dump of contents of this language.
519:             */
520:            public String dumpInfo() {
521:                StringBuilder sb = new StringBuilder();
522:                for (T id : ids) {
523:                    sb.append(id);
524:                    List<String> cats = tokenCategories(id);
525:                    if (cats.size() > 0) {
526:                        sb.append(": ");
527:                        for (int i = 0; i < cats.size(); i++) {
528:                            if (i > 0) {
529:                                sb.append(", ");
530:                            }
531:                            String cat = (String) cats.get(i);
532:                            sb.append('"');
533:                            sb.append(cat);
534:                            sb.append('"');
535:                        }
536:                    }
537:                }
538:                return ids.toString();
539:            }
540:
541:            public String toString() {
542:                return mimeType + ", LH: " + languageHierarchy;
543:            }
544:
545:            private void checkMemberId(T id) {
546:                if (!ids.contains(id)) {
547:                    throw new IllegalArgumentException(id
548:                            + " does not belong to language " + this ); // NOI18N
549:                }
550:            }
551:
552:            private static void checkMimeTypeValid(String mimeType) {
553:                if (mimeType == null) {
554:                    throw new IllegalStateException("mimeType cannot be null"); // NOI18N
555:                }
556:                int slashIndex = mimeType.indexOf('/');
557:                if (slashIndex == -1) { // no slash
558:                    throw new IllegalStateException("mimeType=" + mimeType
559:                            + " does not contain '/'"); // NOI18N
560:                }
561:                if (mimeType.indexOf('/', slashIndex + 1) != -1) {
562:                    throw new IllegalStateException("mimeType=" + mimeType
563:                            + " contains more than one '/'"); // NOI18N
564:                }
565:            }
566:
567:            /**
568:             * Return language hierarchy associated with this language.
569:             * <br>
570:             * This method is for API package accessor only.
571:             */
572:            LanguageHierarchy<T> languageHierarchy() {
573:                return languageHierarchy;
574:            }
575:
576:            LanguageOperation<T> languageOperation() {
577:                return languageOperation;
578:            }
579:
580:            /**
581:             * Accessor of package-private things in this package
582:             * that need to be used by the lexer implementation classes.
583:             */
584:            private static final class Accessor extends LexerApiPackageAccessor {
585:
586:                public <T extends TokenId> Language<T> createLanguage(
587:                        LanguageHierarchy<T> languageHierarchy) {
588:                    return new Language<T>(languageHierarchy);
589:                }
590:
591:                public <T extends TokenId> LanguageHierarchy<T> languageHierarchy(
592:                        Language<T> language) {
593:                    return language.languageHierarchy();
594:                }
595:
596:                public <T extends TokenId> LanguageOperation<T> languageOperation(
597:                        Language<T> language) {
598:                    return language.languageOperation();
599:                }
600:
601:                public <I> TokenHierarchy<I> createTokenHierarchy(
602:                        TokenHierarchyOperation<I, ?> tokenHierarchyOperation) {
603:                    return new TokenHierarchy<I>(tokenHierarchyOperation);
604:                }
605:
606:                public TokenHierarchyEvent createTokenChangeEvent(
607:                        TokenHierarchyEventInfo info) {
608:                    return new TokenHierarchyEvent(info);
609:                }
610:
611:                public <T extends TokenId> TokenChange<T> createTokenChange(
612:                        TokenChangeInfo<T> info) {
613:                    return new TokenChange<T>(info);
614:                }
615:
616:                public <T extends TokenId> TokenChangeInfo<T> tokenChangeInfo(
617:                        TokenChange<T> tokenChange) {
618:                    return tokenChange.info();
619:                }
620:
621:                public <I> TokenHierarchyOperation<I, ?> tokenHierarchyOperation(
622:                        TokenHierarchy<I> tokenHierarchy) {
623:                    return tokenHierarchy.operation();
624:                }
625:
626:                public <T extends TokenId> TokenSequence<T> createTokenSequence(
627:                        TokenList<T> tokenList) {
628:                    return new TokenSequence<T>(tokenList);
629:                }
630:
631:            }
632:
633:        }
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