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1
19
20 package org.openide.util;
21
22 import java.beans.PropertyChangeListener  ;
23 import java.lang.ref.WeakReference ;
24 import java.lang.reflect.Method ;
25 import java.util.Arrays ;
26 import java.util.Iterator ;
27 import java.util.Vector ;
28 import junit.framework.*;
29 import org.netbeans.junit.*;
30
31 public class WeakSetTest extends NbTestCase {
32
33 public WeakSetTest(java.lang.String testName) {
34 super(testName);
35 }
36
37 public static void main(java.lang.String [] args) {
38 junit.textui.TestRunner.run(new NbTestSuite(WeakSetTest.class));
39 }
40
41 public void testToArrayMayContainNullsIssue42271 () {
42 class R implements Runnable {
43 Object [] arr;
44 Object last;
45
46 public R () {
47 int cnt = 10;
48 arr = new Object [cnt];
49 for (int i = 0; i < cnt; i++) {
50 arr[i] = new Integer (i);
51 }
52 }
53
54
55 public void run () {
56
57 WeakReference r = new WeakReference (last);
58 for (int i = 0; i < arr.length; i++) {
59 arr[i] = null;
60 }
61 arr = null;
62 last = null;
63 assertGC ("Last item has to disappear", r);
64 }
65
66 public void putToSet (NotifyWhenIteratedSet s) {
67 for (int i = 0; i < arr.length; i++) {
68 s.add (arr[i]);
69 }
70 assertEquals (arr.length, s.size ());
71 Iterator it = s.superIterator ();
72 Object prev = it.next ();
73 while (it.hasNext ()) {
74 prev = it.next ();
75 }
76 last = prev;
77 }
78 }
79 R r = new R ();
80
81
82
83 NotifyWhenIteratedSet ws = new NotifyWhenIteratedSet (r, 1);
84
85 r.putToSet (ws);
86
87 Object [] arr = ws.toArray ();
88 for (int i = 0; i < arr.length; i++) {
89 assertNotNull (i + "th index should not be null", arr[i]);
90 }
91 }
92
93 private static final class NotifyWhenIteratedSet extends WeakSet {
94 private Runnable run;
95 private int cnt;
96
97 public NotifyWhenIteratedSet (Runnable run, int cnt) {
98 this.run = run;
99 this.cnt = cnt;
100 }
101
102 public Iterator superIterator () {
103 return super.iterator ();
104 }
105
106 public Iterator iterator () {
107 final Iterator it = super.iterator ();
108 class I implements Iterator {
109 public boolean hasNext() {
110 return it.hasNext ();
111 }
112
113 public Object next() {
114 if (--cnt == 0) {
115 run.run ();
116 }
117 return it.next ();
118 }
119
120 public void remove() {
121 it.remove();
122 }
123 }
124 return new I ();
125 }
126 }
127 }
128 |
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