Source Code Cross Referenced for ObjectKeyLongChainedHashMap.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) 2003  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.LongCollection;
022:        import bak.pcj.AbstractLongCollection;
023:        import bak.pcj.LongIterator;
024:        import bak.pcj.hash.DefaultLongHashFunction;
025:        import bak.pcj.util.Exceptions;
026:        import java.util.Set;
027:        import java.util.AbstractSet;
028:        import java.util.Iterator;
029:
030:        import java.io.Serializable;
031:        import java.io.IOException;
032:        import java.io.ObjectInputStream;
033:        import java.io.ObjectOutputStream;
034:
035:        /**
036:         *  This class represents chained hash table based maps from
037:         *  object values to long values.
038:         *
039:         *  @see        ObjectKeyLongOpenHashMap
040:         *  @see        java.util.Map
041:         *
042:         *  @author     Søren Bak
043:         *  @version    1.1     2003/8/3
044:         *  @since      1.1
045:         */
046:        public class ObjectKeyLongChainedHashMap extends
047:                AbstractObjectKeyLongMap implements  ObjectKeyLongMap,
048:                Cloneable, Serializable {
049:
050:            /** Constant indicating relative growth policy. */
051:            private static final int GROWTH_POLICY_RELATIVE = 0;
052:
053:            /** Constant indicating absolute growth policy. */
054:            private static final int GROWTH_POLICY_ABSOLUTE = 1;
055:
056:            /**
057:             *  The default growth policy of this map.
058:             *  @see    #GROWTH_POLICY_RELATIVE
059:             *  @see    #GROWTH_POLICY_ABSOLUTE
060:             */
061:            private static final int DEFAULT_GROWTH_POLICY = GROWTH_POLICY_RELATIVE;
062:
063:            /** The default factor with which to increase the capacity of this map. */
064:            public static final double DEFAULT_GROWTH_FACTOR = 1.0;
065:
066:            /** The default chunk size with which to increase the capacity of this map. */
067:            public static final int DEFAULT_GROWTH_CHUNK = 10;
068:
069:            /** The default capacity of this map. */
070:            public static final int DEFAULT_CAPACITY = 11;
071:
072:            /** The default load factor of this map. */
073:            public static final double DEFAULT_LOAD_FACTOR = 0.75;
074:
075:            /**
076:             *  The size of this map.
077:             *  @serial
078:             */
079:            private int size;
080:
081:            /** The hash table backing up this map. Contains linked entry values. */
082:            private transient Entry[] data;
083:
084:            /**
085:             *  The growth policy of this map. (0 is relative growth, 1 is absolute growth).
086:             *  @serial
087:             */
088:            private int growthPolicy;
089:
090:            /**
091:             *  The growth factor of this map, if the growth policy is
092:             *  relative.
093:             *  @serial
094:             */
095:            private double growthFactor;
096:
097:            /**
098:             *  The growth chunk size of this map, if the growth policy is
099:             *  absolute.
100:             *  @serial
101:             */
102:            private int growthChunk;
103:
104:            /**
105:             *  The load factor of this map.
106:             *  @serial
107:             */
108:            private double loadFactor;
109:
110:            /**
111:             *  The next size at which to expand the data[].
112:             *  @serial
113:             */
114:            private int expandAt;
115:
116:            /** A set view of the keys of this map. */
117:            private transient Set keys;
118:
119:            /** A collection view of the values of this map. */
120:            private transient LongCollection values;
121:
122:            /** Indicates whether last call to containsKey() had a corresponding value. */
123:            private transient boolean hasLastValue;
124:
125:            /** Value corresponding to to the key of the last call of containsKey(). */
126:            private transient long lastValue;
127:
128:            private ObjectKeyLongChainedHashMap(int capacity, int growthPolicy,
129:                    double growthFactor, int growthChunk, double loadFactor) {
130:                if (capacity < 0)
131:                    Exceptions.negativeArgument("capacity", String
132:                            .valueOf(capacity));
133:                if (growthFactor < 0.0)
134:                    Exceptions.negativeArgument("growthFactor", String
135:                            .valueOf(growthFactor));
136:                if (growthChunk < 0)
137:                    Exceptions.negativeArgument("growthChunk", String
138:                            .valueOf(growthChunk));
139:                if (loadFactor <= 0.0)
140:                    Exceptions.negativeOrZeroArgument("loadFactor", String
141:                            .valueOf(loadFactor));
142:                data = new Entry[capacity];
143:                size = 0;
144:                expandAt = (int) Math.round(loadFactor * capacity);
145:                this .growthPolicy = growthPolicy;
146:                this .growthFactor = growthFactor;
147:                this .growthChunk = growthChunk;
148:                this .loadFactor = loadFactor;
149:                hasLastValue = false;
150:            }
151:
152:            /**
153:             *  Creates a new hash map with capacity 11, a relative
154:             *  growth factor of 1.0, and a load factor of 75%.
155:             */
156:            public ObjectKeyLongChainedHashMap() {
157:                this (DEFAULT_CAPACITY);
158:            }
159:
160:            /**
161:             *  Creates a new hash map with the same mappings as a specified map.
162:             *
163:             *  @param      map
164:             *              the map whose mappings to put into the new map.
165:             *
166:             *  @throws     NullPointerException
167:             *              if <tt>map</tt> is <tt>null</tt>.
168:             */
169:            public ObjectKeyLongChainedHashMap(ObjectKeyLongMap map) {
170:                this ();
171:                putAll(map);
172:            }
173:
174:            /**
175:             *  Creates a new hash map with a specified capacity, a relative
176:             *  growth factor of 1.0, and a load factor of 75%.
177:             *
178:             *  @param      capacity
179:             *              the initial capacity of the map.
180:             *
181:             *  @throws     IllegalArgumentException
182:             *              if <tt>capacity</tt> is negative.
183:             */
184:            public ObjectKeyLongChainedHashMap(int capacity) {
185:                this (capacity, DEFAULT_GROWTH_POLICY, DEFAULT_GROWTH_FACTOR,
186:                        DEFAULT_GROWTH_CHUNK, DEFAULT_LOAD_FACTOR);
187:            }
188:
189:            /**
190:             *  Creates a new hash map with a capacity of 11, a relative
191:             *  growth factor of 1.0, and a specified load factor.
192:             *
193:             *  @param      loadFactor
194:             *              the load factor of the map.
195:             *
196:             *  @throws     IllegalArgumentException
197:             *              if <tt>capacity</tt> is negative.
198:             */
199:            public ObjectKeyLongChainedHashMap(double loadFactor) {
200:                this (DEFAULT_CAPACITY, DEFAULT_GROWTH_POLICY,
201:                        DEFAULT_GROWTH_FACTOR, DEFAULT_GROWTH_CHUNK, loadFactor);
202:            }
203:
204:            /**
205:             *  Creates a new hash map with a specified capacity and
206:             *  load factor, and a relative growth factor of 1.0.
207:             *
208:             *  @param      capacity
209:             *              the initial capacity of the map.
210:             *
211:             *  @param      loadFactor
212:             *              the load factor of the map.
213:             *
214:             *  @throws     IllegalArgumentException
215:             *              if <tt>capacity</tt> is negative;
216:             *              if <tt>loadFactor</tt> is not positive.
217:             */
218:            public ObjectKeyLongChainedHashMap(int capacity, double loadFactor) {
219:                this (capacity, DEFAULT_GROWTH_POLICY, DEFAULT_GROWTH_FACTOR,
220:                        DEFAULT_GROWTH_CHUNK, loadFactor);
221:            }
222:
223:            /**
224:             *  Creates a new hash map with a specified capacity,
225:             *  load factor, and relative growth factor.
226:             *
227:             *  <p>The map capacity increases to <tt>capacity()*(1+growthFactor)</tt>.
228:             *  This strategy is good for avoiding many capacity increases, but
229:             *  the amount of wasted memory is approximately the size of the map.
230:             *
231:             *  @param      capacity
232:             *              the initial capacity of the map.
233:             *
234:             *  @param      loadFactor
235:             *              the load factor of the map.
236:             *
237:             *  @param      growthFactor
238:             *              the relative amount with which to increase the
239:             *              the capacity when a capacity increase is needed.
240:             *
241:             *  @throws     IllegalArgumentException
242:             *              if <tt>capacity</tt> is negative;
243:             *              if <tt>loadFactor</tt> is not positive;
244:             *              if <tt>growthFactor</tt> is not positive.
245:             */
246:            public ObjectKeyLongChainedHashMap(int capacity, double loadFactor,
247:                    double growthFactor) {
248:                this (capacity, GROWTH_POLICY_RELATIVE, growthFactor,
249:                        DEFAULT_GROWTH_CHUNK, loadFactor);
250:            }
251:
252:            /**
253:             *  Creates a new hash map with a specified capacity,
254:             *  load factor, and absolute growth factor.
255:             *
256:             *  <p>The map capacity increases to <tt>capacity()+growthChunk</tt>.
257:             *  This strategy is good for avoiding wasting memory. However, an
258:             *  overhead is potentially introduced by frequent capacity increases.
259:             *
260:             *  @param      capacity
261:             *              the initial capacity of the map.
262:             *
263:             *  @param      loadFactor
264:             *              the load factor of the map.
265:             *
266:             *  @param      growthChunk
267:             *              the absolute amount with which to increase the
268:             *              the capacity when a capacity increase is needed.
269:             *
270:             *  @throws     IllegalArgumentException
271:             *              if <tt>capacity</tt> is negative;
272:             *              if <tt>loadFactor</tt> is not positive;
273:             *              if <tt>growthChunk</tt> is not positive;
274:             */
275:            public ObjectKeyLongChainedHashMap(int capacity, double loadFactor,
276:                    int growthChunk) {
277:                this (capacity, GROWTH_POLICY_ABSOLUTE, DEFAULT_GROWTH_FACTOR,
278:                        growthChunk, loadFactor);
279:            }
280:
281:            // ---------------------------------------------------------------
282:            //      Hash table management
283:            // ---------------------------------------------------------------
284:
285:            private static int hash(Object key) {
286:                return key == null ? 0 : key.hashCode();
287:            }
288:
289:            private static boolean keyeq(Object k1, Object k2) {
290:                return k1 == null ? k2 == null : k1.equals(k2);
291:            }
292:
293:            private void ensureCapacity(int elements) {
294:                if (elements >= expandAt) {
295:                    int newcapacity;
296:                    if (growthPolicy == GROWTH_POLICY_RELATIVE)
297:                        newcapacity = (int) (data.length * (1.0 + growthFactor));
298:                    else
299:                        newcapacity = data.length + growthChunk;
300:                    if (newcapacity * loadFactor < elements)
301:                        newcapacity = (int) Math
302:                                .round(((double) elements / loadFactor));
303:                    newcapacity = bak.pcj.hash.Primes.nextPrime(newcapacity);
304:                    expandAt = (int) Math.round(loadFactor * newcapacity);
305:
306:                    Entry[] newdata = new Entry[newcapacity];
307:
308:                    //  re-hash
309:                    for (int i = 0; i < data.length; i++) {
310:                        Entry e = data[i];
311:                        while (e != null) {
312:                            int index = Math.abs(hash(e.key)) % newdata.length;
313:                            Entry next = e.next;
314:                            e.next = newdata[index];
315:                            newdata[index] = e;
316:                            e = next;
317:                        }
318:                    }
319:
320:                    data = newdata;
321:                }
322:            }
323:
324:            private Entry addList(Entry list, Entry v) {
325:                v.next = list;
326:                return v;
327:            }
328:
329:            private Entry removeList(Entry list, Entry e) {
330:                if (list == e) {
331:                    list = e.next;
332:                    e.next = null;
333:                    return list;
334:                }
335:                Entry listStart = list;
336:                while (list.next != e)
337:                    list = list.next;
338:                list.next = e.next;
339:                e.next = null;
340:                return listStart;
341:            }
342:
343:            private Entry searchList(Entry list, Object key) {
344:                while (list != null) {
345:                    if (keyeq(list.key, key))
346:                        return list;
347:                    list = list.next;
348:                }
349:                return null;
350:            }
351:
352:            private Entry getEntry(Object key) {
353:                int index = Math.abs(hash(key)) % data.length;
354:                return searchList(data[index], key);
355:            }
356:
357:            // ---------------------------------------------------------------
358:            //      Operations not supported by abstract implementation
359:            // ---------------------------------------------------------------
360:
361:            public Set keySet() {
362:                if (keys == null)
363:                    keys = new KeySet();
364:                return keys;
365:            }
366:
367:            public long lget() {
368:                if (!hasLastValue)
369:                    Exceptions.noLastElement();
370:                return lastValue;
371:            }
372:
373:            public long put(Object key, long value) {
374:                long result;
375:                int index = Math.abs(hash(key)) % data.length;
376:                Entry e = searchList(data[index], key);
377:                if (e == null) {
378:                    result = MapDefaults.defaultLong();
379:                    e = new Entry(key, value);
380:                    e.next = data[index];
381:                    data[index] = e;
382:                    //  Capacity is increased after insertion in order to
383:                    //  avoid recalculation of index
384:                    ensureCapacity(size + 1);
385:                    size++;
386:                } else {
387:                    result = e.value;
388:                    e.value = value;
389:                }
390:                return result;
391:            }
392:
393:            public LongCollection values() {
394:                if (values == null)
395:                    values = new ValueCollection();
396:                return values;
397:            }
398:
399:            /**
400:             *  Returns a clone of this hash map.
401:             *
402:             *  @return     a clone of this hash map.
403:             *
404:             *  @since      1.1
405:             */
406:            public Object clone() {
407:                try {
408:                    ObjectKeyLongChainedHashMap c = (ObjectKeyLongChainedHashMap) super 
409:                            .clone();
410:                    c.data = new Entry[data.length];
411:                    for (int i = 0; i < data.length; i++)
412:                        c.data[i] = cloneList(data[i]);
413:                    //  The views should not refer to this map's views
414:                    c.values = null;
415:                    c.keys = null;
416:                    return c;
417:                } catch (CloneNotSupportedException e) {
418:                    Exceptions.cloning();
419:                    return null;
420:                }
421:            }
422:
423:            private Entry cloneList(Entry e) {
424:                if (e == null)
425:                    return null;
426:                Entry ne = new Entry(e.getKey(), e.getValue());
427:                ne.next = cloneList(e.next);
428:                return ne;
429:            }
430:
431:            private static class Entry {
432:                Object key;
433:                long value;
434:                Entry next;
435:
436:                Entry(Object key, long value) {
437:                    this .key = key;
438:                    this .value = value;
439:                }
440:
441:                public Object getKey() {
442:                    return key;
443:                }
444:
445:                public long getValue() {
446:                    return value;
447:                }
448:
449:                public boolean equals(Object obj) {
450:                    if (!(obj instanceof  Entry))
451:                        return false;
452:                    Entry e = (Entry) obj;
453:                    return keyeq(e.getKey(), key) && e.getValue() == value;
454:                }
455:            }
456:
457:            public ObjectKeyLongMapIterator entries() {
458:                return new ObjectKeyLongMapIterator() {
459:                    Entry currEntry = null;
460:                    int nextList = nextList(0);
461:                    Entry nextEntry = nextList == -1 ? null : data[nextList];
462:
463:                    int nextList(int index) {
464:                        while (index < data.length && data[index] == null)
465:                            index++;
466:                        return index < data.length ? index : -1;
467:                    }
468:
469:                    public boolean hasNext() {
470:                        return nextEntry != null;
471:                    }
472:
473:                    public void next() {
474:                        if (nextEntry == null)
475:                            Exceptions.endOfIterator();
476:                        currEntry = nextEntry;
477:
478:                        //  Find next
479:                        nextEntry = nextEntry.next;
480:                        if (nextEntry == null) {
481:                            nextList = nextList(nextList + 1);
482:                            if (nextList != -1)
483:                                nextEntry = data[nextList];
484:                        }
485:                    }
486:
487:                    public Object getKey() {
488:                        if (currEntry == null)
489:                            Exceptions.noElementToGet();
490:                        return currEntry.getKey();
491:                    }
492:
493:                    public long getValue() {
494:                        if (currEntry == null)
495:                            Exceptions.noElementToGet();
496:                        return currEntry.getValue();
497:                    }
498:
499:                    public void remove() {
500:                        if (currEntry == null)
501:                            Exceptions.noElementToRemove();
502:                        ObjectKeyLongChainedHashMap.this .remove(currEntry
503:                                .getKey());
504:                        currEntry = null;
505:                    }
506:
507:                };
508:            }
509:
510:            private class KeySet extends AbstractSet {
511:
512:                public void clear() {
513:                    ObjectKeyLongChainedHashMap.this .clear();
514:                }
515:
516:                public boolean contains(Object v) {
517:                    return getEntry(v) != null;
518:                }
519:
520:                public Iterator iterator() {
521:                    return new Iterator() {
522:                        Entry currEntry = null;
523:                        int nextList = nextList(0);
524:                        Entry nextEntry = nextList == -1 ? null
525:                                : data[nextList];
526:
527:                        int nextList(int index) {
528:                            while (index < data.length && data[index] == null)
529:                                index++;
530:                            return index < data.length ? index : -1;
531:                        }
532:
533:                        public boolean hasNext() {
534:                            return nextEntry != null;
535:                        }
536:
537:                        public Object next() {
538:                            if (nextEntry == null)
539:                                Exceptions.endOfIterator();
540:                            currEntry = nextEntry;
541:
542:                            //  Find next
543:                            nextEntry = nextEntry.next;
544:                            if (nextEntry == null) {
545:                                nextList = nextList(nextList + 1);
546:                                if (nextList != -1)
547:                                    nextEntry = data[nextList];
548:                            }
549:                            return currEntry.key;
550:                        }
551:
552:                        public void remove() {
553:                            if (currEntry == null)
554:                                Exceptions.noElementToRemove();
555:                            ObjectKeyLongChainedHashMap.this .remove(currEntry
556:                                    .getKey());
557:                            currEntry = null;
558:                        }
559:                    };
560:                }
561:
562:                public boolean remove(Object v) {
563:                    boolean result = containsKey(v);
564:                    if (result)
565:                        ObjectKeyLongChainedHashMap.this .remove(v);
566:                    return result;
567:                }
568:
569:                public int size() {
570:                    return size;
571:                }
572:
573:            }
574:
575:            private class ValueCollection extends AbstractLongCollection {
576:
577:                public void clear() {
578:                    ObjectKeyLongChainedHashMap.this .clear();
579:                }
580:
581:                public boolean contains(long v) {
582:                    return containsValue(v);
583:                }
584:
585:                public LongIterator iterator() {
586:                    return new LongIterator() {
587:                        Entry currEntry = null;
588:                        int nextList = nextList(0);
589:                        Entry nextEntry = nextList == -1 ? null
590:                                : data[nextList];
591:
592:                        int nextList(int index) {
593:                            while (index < data.length && data[index] == null)
594:                                index++;
595:                            return index < data.length ? index : -1;
596:                        }
597:
598:                        public boolean hasNext() {
599:                            return nextEntry != null;
600:                        }
601:
602:                        public long next() {
603:                            if (nextEntry == null)
604:                                Exceptions.endOfIterator();
605:                            currEntry = nextEntry;
606:
607:                            //  Find next
608:                            nextEntry = nextEntry.next;
609:                            if (nextEntry == null) {
610:                                nextList = nextList(nextList + 1);
611:                                if (nextList != -1)
612:                                    nextEntry = data[nextList];
613:                            }
614:                            return currEntry.value;
615:                        }
616:
617:                        public void remove() {
618:                            if (currEntry == null)
619:                                Exceptions.noElementToRemove();
620:                            ObjectKeyLongChainedHashMap.this .remove(currEntry
621:                                    .getKey());
622:                            currEntry = null;
623:                        }
624:                    };
625:                }
626:
627:                public int size() {
628:                    return size;
629:                }
630:
631:            }
632:
633:            // ---------------------------------------------------------------
634:            //      Operations overwritten for efficiency
635:            // ---------------------------------------------------------------
636:
637:            public void clear() {
638:                java.util.Arrays.fill(data, null);
639:                size = 0;
640:            }
641:
642:            public boolean containsKey(Object key) {
643:                Entry e = getEntry(key);
644:                if (e == null)
645:                    hasLastValue = false;
646:                else {
647:                    hasLastValue = true;
648:                    lastValue = e.value;
649:                }
650:                return hasLastValue;
651:            }
652:
653:            public boolean containsValue(long value) {
654:                for (int i = 0; i < data.length; i++) {
655:                    Entry e = data[i];
656:                    while (e != null) {
657:                        if (e.value == value)
658:                            return true;
659:                        e = e.next;
660:                    }
661:                }
662:                return false;
663:            }
664:
665:            public long get(Object key) {
666:                int index = Math.abs(hash(key)) % data.length;
667:                Entry e = searchList(data[index], key);
668:                return e != null ? e.value : MapDefaults.defaultLong();
669:            }
670:
671:            public boolean isEmpty() {
672:                return size == 0;
673:            }
674:
675:            public long remove(Object key) {
676:                int index = Math.abs(hash(key)) % data.length;
677:                Entry e = searchList(data[index], key);
678:                long value;
679:                if (e != null) {
680:                    //  This can be improved to one iteration
681:                    data[index] = removeList(data[index], e);
682:                    value = e.value;
683:                    size--;
684:                } else
685:                    value = MapDefaults.defaultLong();
686:                return value;
687:            }
688:
689:            public int size() {
690:                return size;
691:            }
692:
693:            public long tget(Object key) {
694:                int index = Math.abs(hash(key)) % data.length;
695:                Entry e = searchList(data[index], key);
696:                if (e == null)
697:                    Exceptions.noSuchMapping(key);
698:                return e.value;
699:            }
700:
701:            // ---------------------------------------------------------------
702:            //      Serialization
703:            // ---------------------------------------------------------------
704:
705:            /**
706:             *  @serialData     Default fields; the capacity of the
707:             *                  map (<tt>int</tt>); the maps's entries
708:             *                  (<tt>Object</tt>, <tt>long</tt>).
709:             */
710:            private void writeObject(ObjectOutputStream s) throws IOException {
711:                s.defaultWriteObject();
712:                s.writeInt(data.length);
713:                ObjectKeyLongMapIterator i = entries();
714:                while (i.hasNext()) {
715:                    i.next();
716:                    s.writeObject(i.getKey());
717:                    s.writeLong(i.getValue());
718:                }
719:            }
720:
721:            private void readObject(ObjectInputStream s) throws IOException,
722:                    ClassNotFoundException {
723:                s.defaultReadObject();
724:                data = new Entry[s.readInt()];
725:                for (int i = 0; i < size; i++) {
726:                    Object key = s.readObject();
727:                    long value = s.readLong();
728:                    int index = Math.abs(hash(key)) % data.length;
729:                    Entry e = new Entry(key, value);
730:                    e.next = data[index];
731:                    data[index] = e;
732:                }
733:            }
734:
735:        }
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