Source Code Cross Referenced for ByteKeyBooleanChainedHashMap.java in  » Development » PCJ » bak » pcj » map » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » PCJ » bak.pcj.map 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Primitive Collections for Java.
003:         *  Copyright (C) 2002  Søren Bak
004:         *
005:         *  This library is free software; you can redistribute it and/or
006:         *  modify it under the terms of the GNU Lesser General Public
007:         *  License as published by the Free Software Foundation; either
008:         *  version 2.1 of the License, or (at your option) any later version.
009:         *
010:         *  This library is distributed in the hope that it will be useful,
011:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         *  Lesser General Public License for more details.
014:         *
015:         *  You should have received a copy of the GNU Lesser General Public
016:         *  License along with this library; if not, write to the Free Software
017:         *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018:         */
019:        package bak.pcj.map;
020:
021:        import bak.pcj.BooleanCollection;
022:        import bak.pcj.AbstractBooleanCollection;
023:        import bak.pcj.ByteIterator;
024:        import bak.pcj.BooleanIterator;
025:        import bak.pcj.AbstractByteCollection;
026:        import bak.pcj.set.AbstractByteSet;
027:        import bak.pcj.set.ByteSet;
028:        import bak.pcj.hash.ByteHashFunction;
029:        import bak.pcj.hash.DefaultByteHashFunction;
030:        import bak.pcj.util.Exceptions;
031:
032:        import java.io.Serializable;
033:        import java.io.IOException;
034:        import java.io.ObjectInputStream;
035:        import java.io.ObjectOutputStream;
036:
037:        /**
038:         *  This class represents chained hash table based maps from
039:         *  byte values to boolean values.
040:         *
041:         *  @see        ByteKeyBooleanOpenHashMap
042:         *  @see        java.util.Map
043:         *
044:         *  @author     Søren Bak
045:         *  @version    1.4     21-08-2003 19:48
046:         *  @since      1.0
047:         */
048:        public class ByteKeyBooleanChainedHashMap extends
049:                AbstractByteKeyBooleanMap implements  ByteKeyBooleanMap,
050:                Cloneable, Serializable {
051:
052:            /** Constant indicating relative growth policy. */
053:            private static final int GROWTH_POLICY_RELATIVE = 0;
054:
055:            /** Constant indicating absolute growth policy. */
056:            private static final int GROWTH_POLICY_ABSOLUTE = 1;
057:
058:            /**
059:             *  The default growth policy of this map.
060:             *  @see    #GROWTH_POLICY_RELATIVE
061:             *  @see    #GROWTH_POLICY_ABSOLUTE
062:             */
063:            private static final int DEFAULT_GROWTH_POLICY = GROWTH_POLICY_RELATIVE;
064:
065:            /** The default factor with which to increase the capacity of this map. */
066:            public static final double DEFAULT_GROWTH_FACTOR = 1.0;
067:
068:            /** The default chunk size with which to increase the capacity of this map. */
069:            public static final int DEFAULT_GROWTH_CHUNK = 10;
070:
071:            /** The default capacity of this map. */
072:            public static final int DEFAULT_CAPACITY = 11;
073:
074:            /** The default load factor of this map. */
075:            public static final double DEFAULT_LOAD_FACTOR = 0.75;
076:
077:            /**
078:             *  The hash function used to hash keys in this map.
079:             *  @serial
080:             */
081:            private ByteHashFunction keyhash;
082:
083:            /**
084:             *  The size of this map.
085:             *  @serial
086:             */
087:            private int size;
088:
089:            /** The hash table backing up this map. Contains linked entry values. */
090:            private transient Entry[] data;
091:
092:            /**
093:             *  The growth policy of this map (0 is relative growth, 1 is absolute growth).
094:             *  @serial
095:             */
096:            private int growthPolicy;
097:
098:            /**
099:             *  The growth factor of this map, if the growth policy is
100:             *  relative.
101:             *  @serial
102:             */
103:            private double growthFactor;
104:
105:            /**
106:             *  The growth chunk size of this map, if the growth policy is
107:             *  absolute.
108:             *  @serial
109:             */
110:            private int growthChunk;
111:
112:            /**
113:             *  The load factor of this map.
114:             *  @serial
115:             */
116:            private double loadFactor;
117:
118:            /**
119:             *  The next size at which to expand the data[].
120:             *  @serial
121:             */
122:            private int expandAt;
123:
124:            /** A set view of the keys of this map. */
125:            private transient ByteSet keys;
126:
127:            /** A collection view of the values of this map. */
128:            private transient BooleanCollection values;
129:
130:            /** Indicates whether last call to containsKey() had a corresponding value. */
131:            private transient boolean hasLastValue;
132:
133:            /** Value corresponding to the key of the last call of containsKey(). */
134:            private transient boolean lastValue;
135:
136:            private ByteKeyBooleanChainedHashMap(ByteHashFunction keyhash,
137:                    int capacity, int growthPolicy, double growthFactor,
138:                    int growthChunk, double loadFactor) {
139:                if (keyhash == null)
140:                    Exceptions.nullArgument("hash function");
141:                if (capacity < 0)
142:                    Exceptions.negativeArgument("capacity", String
143:                            .valueOf(capacity));
144:                if (growthFactor < 0.0)
145:                    Exceptions.negativeArgument("growthFactor", String
146:                            .valueOf(growthFactor));
147:                if (growthChunk < 0)
148:                    Exceptions.negativeArgument("growthChunk", String
149:                            .valueOf(growthChunk));
150:                if (loadFactor <= 0.0)
151:                    Exceptions.negativeOrZeroArgument("loadFactor", String
152:                            .valueOf(loadFactor));
153:                this .keyhash = keyhash;
154:                data = new Entry[capacity];
155:                size = 0;
156:                expandAt = (int) Math.round(loadFactor * capacity);
157:                this .growthPolicy = growthPolicy;
158:                this .growthFactor = growthFactor;
159:                this .growthChunk = growthChunk;
160:                this .loadFactor = loadFactor;
161:                hasLastValue = false;
162:            }
163:
164:            private ByteKeyBooleanChainedHashMap(int capacity,
165:                    int growthPolicy, double growthFactor, int growthChunk,
166:                    double loadFactor) {
167:                this (DefaultByteHashFunction.INSTANCE, capacity, growthPolicy,
168:                        growthFactor, growthChunk, loadFactor);
169:            }
170:
171:            /**
172:             *  Creates a new hash map with capacity 11, a relative
173:             *  growth factor of 1.0, and a load factor of 75%.
174:             */
175:            public ByteKeyBooleanChainedHashMap() {
176:                this (DEFAULT_CAPACITY);
177:            }
178:
179:            /**
180:             *  Creates a new hash map with the same mappings as a specified map.
181:             *
182:             *  @param      map
183:             *              the map whose mappings to put into the new map.
184:             *
185:             *  @throws     NullPointerException
186:             *              if <tt>map</tt> is <tt>null</tt>.
187:             */
188:            public ByteKeyBooleanChainedHashMap(ByteKeyBooleanMap map) {
189:                this ();
190:                putAll(map);
191:            }
192:
193:            /**
194:             *  Creates a new hash map with a specified capacity, a relative
195:             *  growth factor of 1.0, and a load factor of 75%.
196:             *
197:             *  @param      capacity
198:             *              the initial capacity of the map.
199:             *
200:             *  @throws     IllegalArgumentException
201:             *              if <tt>capacity</tt> is negative.
202:             */
203:            public ByteKeyBooleanChainedHashMap(int capacity) {
204:                this (capacity, DEFAULT_GROWTH_POLICY, DEFAULT_GROWTH_FACTOR,
205:                        DEFAULT_GROWTH_CHUNK, DEFAULT_LOAD_FACTOR);
206:            }
207:
208:            /**
209:             *  Creates a new hash map with a capacity of 11, a relative
210:             *  growth factor of 1.0, and a specified load factor.
211:             *
212:             *  @param      loadFactor
213:             *              the load factor of the map.
214:             *
215:             *  @throws     IllegalArgumentException
216:             *              if <tt>capacity</tt> is negative.
217:             */
218:            public ByteKeyBooleanChainedHashMap(double loadFactor) {
219:                this (DEFAULT_CAPACITY, DEFAULT_GROWTH_POLICY,
220:                        DEFAULT_GROWTH_FACTOR, DEFAULT_GROWTH_CHUNK, loadFactor);
221:            }
222:
223:            /**
224:             *  Creates a new hash map with a specified capacity and
225:             *  load factor, and a relative growth factor of 1.0.
226:             *
227:             *  @param      capacity
228:             *              the initial capacity of the map.
229:             *
230:             *  @param      loadFactor
231:             *              the load factor of the map.
232:             *
233:             *  @throws     IllegalArgumentException
234:             *              if <tt>capacity</tt> is negative;
235:             *              if <tt>loadFactor</tt> is not positive.
236:             */
237:            public ByteKeyBooleanChainedHashMap(int capacity, double loadFactor) {
238:                this (capacity, DEFAULT_GROWTH_POLICY, DEFAULT_GROWTH_FACTOR,
239:                        DEFAULT_GROWTH_CHUNK, loadFactor);
240:            }
241:
242:            /**
243:             *  Creates a new hash map with a specified capacity,
244:             *  load factor, and relative growth factor.
245:             *
246:             *  <p>The map capacity increases to <tt>capacity()*(1+growthFactor)</tt>.
247:             *  This strategy is good for avoiding many capacity increases, but
248:             *  the amount of wasted memory is approximately the size of the map.
249:             *
250:             *  @param      capacity
251:             *              the initial capacity of the map.
252:             *
253:             *  @param      loadFactor
254:             *              the load factor of the map.
255:             *
256:             *  @param      growthFactor
257:             *              the relative amount with which to increase the
258:             *              the capacity when a capacity increase is needed.
259:             *
260:             *  @throws     IllegalArgumentException
261:             *              if <tt>capacity</tt> is negative;
262:             *              if <tt>loadFactor</tt> is not positive;
263:             *              if <tt>growthFactor</tt> is not positive.
264:             */
265:            public ByteKeyBooleanChainedHashMap(int capacity,
266:                    double loadFactor, double growthFactor) {
267:                this (capacity, GROWTH_POLICY_RELATIVE, growthFactor,
268:                        DEFAULT_GROWTH_CHUNK, loadFactor);
269:            }
270:
271:            /**
272:             *  Creates a new hash map with a specified capacity,
273:             *  load factor, and absolute growth factor.
274:             *
275:             *  <p>The map capacity increases to <tt>capacity()+growthChunk</tt>.
276:             *  This strategy is good for avoiding wasting memory. However, an
277:             *  overhead is potentially introduced by frequent capacity increases.
278:             *
279:             *  @param      capacity
280:             *              the initial capacity of the map.
281:             *
282:             *  @param      loadFactor
283:             *              the load factor of the map.
284:             *
285:             *  @param      growthChunk
286:             *              the absolute amount with which to increase the
287:             *              the capacity when a capacity increase is needed.
288:             *
289:             *  @throws     IllegalArgumentException
290:             *              if <tt>capacity</tt> is negative;
291:             *              if <tt>loadFactor</tt> is not positive;
292:             *              if <tt>growthChunk</tt> is not positive;
293:             */
294:            public ByteKeyBooleanChainedHashMap(int capacity,
295:                    double loadFactor, int growthChunk) {
296:                this (capacity, GROWTH_POLICY_ABSOLUTE, DEFAULT_GROWTH_FACTOR,
297:                        growthChunk, loadFactor);
298:            }
299:
300:            // ---------------------------------------------------------------
301:            //      Constructors with hash function argument
302:            // ---------------------------------------------------------------
303:
304:            /**
305:             *  Creates a new hash map with capacity 11, a relative
306:             *  growth factor of 1.0, and a load factor of 75%.
307:             *
308:             *  @param      keyhash
309:             *              the hash function to use when hashing keys.
310:             *
311:             *  @throws     NullPointerException
312:             *              if <tt>keyhash</tt> is <tt>null</tt>.
313:             */
314:            public ByteKeyBooleanChainedHashMap(ByteHashFunction keyhash) {
315:                this (keyhash, DEFAULT_CAPACITY, DEFAULT_GROWTH_POLICY,
316:                        DEFAULT_GROWTH_FACTOR, DEFAULT_GROWTH_CHUNK,
317:                        DEFAULT_LOAD_FACTOR);
318:            }
319:
320:            /**
321:             *  Creates a new hash map with a specified capacity, a relative
322:             *  growth factor of 1.0, and a load factor of 75%.
323:             *
324:             *  @param      keyhash
325:             *              the hash function to use when hashing keys.
326:             *
327:             *  @param      capacity
328:             *              the initial capacity of the map.
329:             *
330:             *  @throws     IllegalArgumentException
331:             *              if <tt>capacity</tt> is negative.
332:             *
333:             *  @throws     NullPointerException
334:             *              if <tt>keyhash</tt> is <tt>null</tt>.
335:             */
336:            public ByteKeyBooleanChainedHashMap(ByteHashFunction keyhash,
337:                    int capacity) {
338:                this (keyhash, capacity, DEFAULT_GROWTH_POLICY,
339:                        DEFAULT_GROWTH_FACTOR, DEFAULT_GROWTH_CHUNK,
340:                        DEFAULT_LOAD_FACTOR);
341:            }
342:
343:            /**
344:             *  Creates a new hash map with a capacity of 11, a relative
345:             *  growth factor of 1.0, and a specified load factor.
346:             *
347:             *  @param      keyhash
348:             *              the hash function to use when hashing keys.
349:             *
350:             *  @param      loadFactor
351:             *              the load factor of the map.
352:             *
353:             *  @throws     IllegalArgumentException
354:             *              if <tt>capacity</tt> is negative.
355:             *
356:             *  @throws     NullPointerException
357:             *              if <tt>keyhash</tt> is <tt>null</tt>.
358:             */
359:            public ByteKeyBooleanChainedHashMap(ByteHashFunction keyhash,
360:                    double loadFactor) {
361:                this (keyhash, DEFAULT_CAPACITY, DEFAULT_GROWTH_POLICY,
362:                        DEFAULT_GROWTH_FACTOR, DEFAULT_GROWTH_CHUNK, loadFactor);
363:            }
364:
365:            /**
366:             *  Creates a new hash map with a specified capacity and
367:             *  load factor, and a relative growth factor of 1.0.
368:             *
369:             *  @param      keyhash
370:             *              the hash function to use when hashing keys.
371:             *
372:             *  @param      capacity
373:             *              the initial capacity of the map.
374:             *
375:             *  @param      loadFactor
376:             *              the load factor of the map.
377:             *
378:             *  @throws     IllegalArgumentException
379:             *              if <tt>capacity</tt> is negative;
380:             *              if <tt>loadFactor</tt> is not positive.
381:             *
382:             *  @throws     NullPointerException
383:             *              if <tt>keyhash</tt> is <tt>null</tt>.
384:             */
385:            public ByteKeyBooleanChainedHashMap(ByteHashFunction keyhash,
386:                    int capacity, double loadFactor) {
387:                this (keyhash, capacity, DEFAULT_GROWTH_POLICY,
388:                        DEFAULT_GROWTH_FACTOR, DEFAULT_GROWTH_CHUNK, loadFactor);
389:            }
390:
391:            /**
392:             *  Creates a new hash map with a specified capacity,
393:             *  load factor, and relative growth factor.
394:             *
395:             *  <p>The map capacity increases to <tt>capacity()*(1+growthFactor)</tt>.
396:             *  This strategy is good for avoiding many capacity increases, but
397:             *  the amount of wasted memory is approximately the size of the map.
398:             *
399:             *  @param      keyhash
400:             *              the hash function to use when hashing keys.
401:             *
402:             *  @param      capacity
403:             *              the initial capacity of the map.
404:             *
405:             *  @param      loadFactor
406:             *              the load factor of the map.
407:             *
408:             *  @param      growthFactor
409:             *              the relative amount with which to increase the
410:             *              the capacity when a capacity increase is needed.
411:             *
412:             *  @throws     IllegalArgumentException
413:             *              if <tt>capacity</tt> is negative;
414:             *              if <tt>loadFactor</tt> is not positive;
415:             *              if <tt>growthFactor</tt> is not positive.
416:             *
417:             *  @throws     NullPointerException
418:             *              if <tt>keyhash</tt> is <tt>null</tt>.
419:             */
420:            public ByteKeyBooleanChainedHashMap(ByteHashFunction keyhash,
421:                    int capacity, double loadFactor, double growthFactor) {
422:                this (keyhash, capacity, GROWTH_POLICY_RELATIVE, growthFactor,
423:                        DEFAULT_GROWTH_CHUNK, loadFactor);
424:            }
425:
426:            /**
427:             *  Creates a new hash map with a specified capacity,
428:             *  load factor, and absolute growth factor.
429:             *
430:             *  <p>The map capacity increases to <tt>capacity()+growthChunk</tt>.
431:             *  This strategy is good for avoiding wasting memory. However, an
432:             *  overhead is potentially introduced by frequent capacity increases.
433:             *
434:             *  @param      keyhash
435:             *              the hash function to use when hashing keys.
436:             *
437:             *  @param      capacity
438:             *              the initial capacity of the map.
439:             *
440:             *  @param      loadFactor
441:             *              the load factor of the map.
442:             *
443:             *  @param      growthChunk
444:             *              the absolute amount with which to increase the
445:             *              the capacity when a capacity increase is needed.
446:             *
447:             *  @throws     IllegalArgumentException
448:             *              if <tt>capacity</tt> is negative;
449:             *              if <tt>loadFactor</tt> is not positive;
450:             *              if <tt>growthChunk</tt> is not positive;
451:             *
452:             *  @throws     NullPointerException
453:             *              if <tt>keyhash</tt> is <tt>null</tt>.
454:             */
455:            public ByteKeyBooleanChainedHashMap(ByteHashFunction keyhash,
456:                    int capacity, double loadFactor, int growthChunk) {
457:                this (keyhash, capacity, GROWTH_POLICY_ABSOLUTE,
458:                        DEFAULT_GROWTH_FACTOR, growthChunk, loadFactor);
459:            }
460:
461:            // ---------------------------------------------------------------
462:            //      Hash table management
463:            // ---------------------------------------------------------------
464:
465:            private void ensureCapacity(int elements) {
466:                if (elements >= expandAt) {
467:                    int newcapacity;
468:                    if (growthPolicy == GROWTH_POLICY_RELATIVE)
469:                        newcapacity = (int) (data.length * (1.0 + growthFactor));
470:                    else
471:                        newcapacity = data.length + growthChunk;
472:                    if (newcapacity * loadFactor < elements)
473:                        newcapacity = (int) Math
474:                                .round(((double) elements / loadFactor));
475:                    newcapacity = bak.pcj.hash.Primes.nextPrime(newcapacity);
476:                    expandAt = (int) Math.round(loadFactor * newcapacity);
477:
478:                    Entry[] newdata = new Entry[newcapacity];
479:
480:                    //  re-hash
481:                    for (int i = 0; i < data.length; i++) {
482:                        Entry e = data[i];
483:                        while (e != null) {
484:                            int index = Math.abs(keyhash.hash(e.key))
485:                                    % newdata.length;
486:                            Entry next = e.next;
487:                            e.next = newdata[index];
488:                            newdata[index] = e;
489:                            e = next;
490:                        }
491:                    }
492:
493:                    data = newdata;
494:                }
495:            }
496:
497:            private Entry addList(Entry list, Entry v) {
498:                v.next = list;
499:                return v;
500:            }
501:
502:            private Entry removeList(Entry list, Entry e) {
503:                if (list == e) {
504:                    list = e.next;
505:                    e.next = null;
506:                    return list;
507:                }
508:                Entry listStart = list;
509:                while (list.next != e)
510:                    list = list.next;
511:                list.next = e.next;
512:                e.next = null;
513:                return listStart;
514:            }
515:
516:            private Entry searchList(Entry list, byte key) {
517:                while (list != null) {
518:                    if (list.key == key)
519:                        return list;
520:                    list = list.next;
521:                }
522:                return null;
523:            }
524:
525:            private Entry getEntry(byte key) {
526:                int index = Math.abs(keyhash.hash(key)) % data.length;
527:                return searchList(data[index], key);
528:            }
529:
530:            // ---------------------------------------------------------------
531:            //      Operations not supported by abstract implementation
532:            // ---------------------------------------------------------------
533:
534:            public ByteSet keySet() {
535:                if (keys == null)
536:                    keys = new KeySet();
537:                return keys;
538:            }
539:
540:            public boolean lget() {
541:                if (!hasLastValue)
542:                    Exceptions.noLastElement();
543:                return lastValue;
544:            }
545:
546:            public boolean put(byte key, boolean value) {
547:                boolean result;
548:                int index = Math.abs(keyhash.hash(key)) % data.length;
549:                Entry e = searchList(data[index], key);
550:                if (e == null) {
551:                    result = MapDefaults.defaultBoolean();
552:                    e = new Entry(key, value);
553:                    e.next = data[index];
554:                    data[index] = e;
555:                    //  Capacity is increased after insertion in order to
556:                    //  avoid recalculation of index
557:                    ensureCapacity(size + 1);
558:                    size++;
559:                } else {
560:                    result = e.value;
561:                    e.value = value;
562:                }
563:                return result;
564:            }
565:
566:            public BooleanCollection values() {
567:                if (values == null)
568:                    values = new ValueCollection();
569:                return values;
570:            }
571:
572:            /**
573:             *  Returns a clone of this hash map.
574:             *
575:             *  @return     a clone of this hash map.
576:             *
577:             *  @since      1.1
578:             */
579:            public Object clone() {
580:                try {
581:                    ByteKeyBooleanChainedHashMap c = (ByteKeyBooleanChainedHashMap) super 
582:                            .clone();
583:                    c.data = new Entry[data.length];
584:                    for (int i = 0; i < data.length; i++)
585:                        c.data[i] = cloneList(data[i]);
586:                    //  The views should not refer to this map's views
587:                    c.values = null;
588:                    c.keys = null;
589:                    return c;
590:                } catch (CloneNotSupportedException e) {
591:                    Exceptions.cloning();
592:                    return null;
593:                }
594:            }
595:
596:            private Entry cloneList(Entry e) {
597:                if (e == null)
598:                    return null;
599:                Entry ne = new Entry(e.getKey(), e.getValue());
600:                ne.next = cloneList(e.next);
601:                return ne;
602:            }
603:
604:            private static class Entry {
605:                byte key;
606:                boolean value;
607:                Entry next;
608:
609:                Entry(byte key, boolean value) {
610:                    this .key = key;
611:                    this .value = value;
612:                }
613:
614:                public byte getKey() {
615:                    return key;
616:                }
617:
618:                public boolean getValue() {
619:                    return value;
620:                }
621:
622:                public boolean equals(Object obj) {
623:                    if (!(obj instanceof  Entry))
624:                        return false;
625:                    Entry e = (Entry) obj;
626:                    return e.getKey() == key && e.getValue() == value;
627:                }
628:            }
629:
630:            public ByteKeyBooleanMapIterator entries() {
631:                return new ByteKeyBooleanMapIterator() {
632:                    Entry currEntry = null;
633:                    int nextList = nextList(0);
634:                    Entry nextEntry = nextList == -1 ? null : data[nextList];
635:
636:                    int nextList(int index) {
637:                        while (index < data.length && data[index] == null)
638:                            index++;
639:                        return index < data.length ? index : -1;
640:                    }
641:
642:                    public boolean hasNext() {
643:                        return nextEntry != null;
644:                    }
645:
646:                    public void next() {
647:                        if (nextEntry == null)
648:                            Exceptions.endOfIterator();
649:                        currEntry = nextEntry;
650:
651:                        //  Find next
652:                        nextEntry = nextEntry.next;
653:                        if (nextEntry == null) {
654:                            nextList = nextList(nextList + 1);
655:                            if (nextList != -1)
656:                                nextEntry = data[nextList];
657:                        }
658:                    }
659:
660:                    public byte getKey() {
661:                        if (currEntry == null)
662:                            Exceptions.noElementToGet();
663:                        return currEntry.getKey();
664:                    }
665:
666:                    public boolean getValue() {
667:                        if (currEntry == null)
668:                            Exceptions.noElementToGet();
669:                        return currEntry.getValue();
670:                    }
671:
672:                    public void remove() {
673:                        if (currEntry == null)
674:                            Exceptions.noElementToRemove();
675:                        ByteKeyBooleanChainedHashMap.this .remove(currEntry
676:                                .getKey());
677:                        currEntry = null;
678:                    }
679:
680:                };
681:            }
682:
683:            private class KeySet extends AbstractByteSet {
684:
685:                public void clear() {
686:                    ByteKeyBooleanChainedHashMap.this .clear();
687:                }
688:
689:                public boolean contains(byte v) {
690:                    return getEntry(v) != null;
691:                }
692:
693:                public ByteIterator iterator() {
694:                    return new ByteIterator() {
695:                        Entry currEntry = null;
696:                        int nextList = nextList(0);
697:                        Entry nextEntry = nextList == -1 ? null
698:                                : data[nextList];
699:
700:                        int nextList(int index) {
701:                            while (index < data.length && data[index] == null)
702:                                index++;
703:                            return index < data.length ? index : -1;
704:                        }
705:
706:                        public boolean hasNext() {
707:                            return nextEntry != null;
708:                        }
709:
710:                        public byte next() {
711:                            if (nextEntry == null)
712:                                Exceptions.endOfIterator();
713:                            currEntry = nextEntry;
714:
715:                            //  Find next
716:                            nextEntry = nextEntry.next;
717:                            if (nextEntry == null) {
718:                                nextList = nextList(nextList + 1);
719:                                if (nextList != -1)
720:                                    nextEntry = data[nextList];
721:                            }
722:                            return currEntry.key;
723:                        }
724:
725:                        public void remove() {
726:                            if (currEntry == null)
727:                                Exceptions.noElementToRemove();
728:                            ByteKeyBooleanChainedHashMap.this .remove(currEntry
729:                                    .getKey());
730:                            currEntry = null;
731:                        }
732:                    };
733:                }
734:
735:                public boolean remove(byte v) {
736:                    boolean result = containsKey(v);
737:                    if (result)
738:                        ByteKeyBooleanChainedHashMap.this .remove(v);
739:                    return result;
740:                }
741:
742:                public int size() {
743:                    return size;
744:                }
745:
746:            }
747:
748:            private class ValueCollection extends AbstractBooleanCollection {
749:
750:                public void clear() {
751:                    ByteKeyBooleanChainedHashMap.this .clear();
752:                }
753:
754:                public boolean contains(boolean v) {
755:                    return containsValue(v);
756:                }
757:
758:                public BooleanIterator iterator() {
759:                    return new BooleanIterator() {
760:                        Entry currEntry = null;
761:                        int nextList = nextList(0);
762:                        Entry nextEntry = nextList == -1 ? null
763:                                : data[nextList];
764:
765:                        int nextList(int index) {
766:                            while (index < data.length && data[index] == null)
767:                                index++;
768:                            return index < data.length ? index : -1;
769:                        }
770:
771:                        public boolean hasNext() {
772:                            return nextEntry != null;
773:                        }
774:
775:                        public boolean next() {
776:                            if (nextEntry == null)
777:                                Exceptions.endOfIterator();
778:                            currEntry = nextEntry;
779:
780:                            //  Find next
781:                            nextEntry = nextEntry.next;
782:                            if (nextEntry == null) {
783:                                nextList = nextList(nextList + 1);
784:                                if (nextList != -1)
785:                                    nextEntry = data[nextList];
786:                            }
787:                            return currEntry.value;
788:                        }
789:
790:                        public void remove() {
791:                            if (currEntry == null)
792:                                Exceptions.noElementToRemove();
793:                            ByteKeyBooleanChainedHashMap.this .remove(currEntry
794:                                    .getKey());
795:                            currEntry = null;
796:                        }
797:                    };
798:                }
799:
800:                public int size() {
801:                    return size;
802:                }
803:
804:            }
805:
806:            // ---------------------------------------------------------------
807:            //      Operations overwritten for efficiency
808:            // ---------------------------------------------------------------
809:
810:            public void clear() {
811:                java.util.Arrays.fill(data, null);
812:                size = 0;
813:            }
814:
815:            public boolean containsKey(byte key) {
816:                Entry e = getEntry(key);
817:                if (e == null)
818:                    hasLastValue = false;
819:                else {
820:                    hasLastValue = true;
821:                    lastValue = e.value;
822:                }
823:                return hasLastValue;
824:            }
825:
826:            public boolean containsValue(boolean value) {
827:                for (int i = 0; i < data.length; i++) {
828:                    Entry e = data[i];
829:                    while (e != null) {
830:                        if (e.value == value)
831:                            return true;
832:                        e = e.next;
833:                    }
834:                }
835:                return false;
836:            }
837:
838:            public boolean get(byte key) {
839:                int index = Math.abs(keyhash.hash(key)) % data.length;
840:                Entry e = searchList(data[index], key);
841:                return e != null ? e.value : MapDefaults.defaultBoolean();
842:            }
843:
844:            public boolean isEmpty() {
845:                return size == 0;
846:            }
847:
848:            public boolean remove(byte key) {
849:                int index = Math.abs(keyhash.hash(key)) % data.length;
850:                Entry e = searchList(data[index], key);
851:                boolean value;
852:                if (e != null) {
853:                    //  This can be improved to one iteration
854:                    data[index] = removeList(data[index], e);
855:                    value = e.value;
856:                    size--;
857:                } else
858:                    value = MapDefaults.defaultBoolean();
859:                return value;
860:            }
861:
862:            public int size() {
863:                return size;
864:            }
865:
866:            public boolean tget(byte key) {
867:                int index = Math.abs(keyhash.hash(key)) % data.length;
868:                Entry e = searchList(data[index], key);
869:                if (e == null)
870:                    Exceptions.noSuchMapping(String.valueOf(key));
871:                return e.value;
872:            }
873:
874:            // ---------------------------------------------------------------
875:            //      Serialization
876:            // ---------------------------------------------------------------
877:
878:            /**
879:             *  @serialData     Default fields; the capacity of the
880:             *                  map (<tt>int</tt>); the maps's entries
881:             *                  (<tt>byte</tt>, <tt>boolean</tt>).
882:             *
883:             *  @since          1.1
884:             */
885:            private void writeObject(ObjectOutputStream s) throws IOException {
886:                s.defaultWriteObject();
887:                s.writeInt(data.length);
888:                ByteKeyBooleanMapIterator i = entries();
889:                while (i.hasNext()) {
890:                    i.next();
891:                    s.writeByte(i.getKey());
892:                    s.writeBoolean(i.getValue());
893:                }
894:            }
895:
896:            /**
897:             *  @since          1.1
898:             */
899:            private void readObject(ObjectInputStream s) throws IOException,
900:                    ClassNotFoundException {
901:                s.defaultReadObject();
902:                data = new Entry[s.readInt()];
903:                for (int i = 0; i < size; i++) {
904:                    byte key = s.readByte();
905:                    boolean value = s.readBoolean();
906:                    int index = Math.abs(keyhash.hash(key)) % data.length;
907:                    Entry e = new Entry(key, value);
908:                    e.next = data[index];
909:                    data[index] = e;
910:                }
911:            }
912:
913:        }
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