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1 package org.objectweb.jac.util;
2
3 import java.lang.Cloneable  ;
4 import java.util.AbstractSet ;
5 import java.util.Collection ;
6 import java.util.Iterator ;
7 import java.util.Set ;
8 import java.util.WeakHashMap ;
9
10
11 public class WeakHashSet extends AbstractSet
12 implements Set
13 {
14 private transient WeakHashMap map;
15
16 public WeakHashSet() {
17 map = new WeakHashMap();
18 }
19 public WeakHashSet(Collection c) {
20 map = new WeakHashMap(Math.max((int) (c.size()/.75f) + 1, 16));
21 addAll(c);
22 }
23 public WeakHashSet(int initialCapacity, float loadFactor) {
24 map = new WeakHashMap(initialCapacity, loadFactor);
25 }
26 public WeakHashSet(int initialCapacity) {
27 map = new WeakHashMap(initialCapacity);
28 }
29
30 public Iterator iterator() {
31 return map.keySet().iterator();
32 }
33
34 public int size() {
35 return map.size();
36 }
37 public boolean isEmpty() {
38 return map.isEmpty();
39 }
40
41 public boolean contains(Object o) {
42 return map.containsKey(o);
43 }
44
45 public boolean add(Object o) {
46 return map.put(o, Boolean.TRUE)==null;
47 }
48 public boolean remove(Object o) {
49 return map.remove(o)==Boolean.TRUE;
50 }
51 public void clear() {
52 map.clear();
53 }
54 }
55 |
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