1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 package com.sun.star.lib.util; 25 26 import util.WaitUnreachable; 27 28 import org.junit.Test; 29 import static org.junit.Assert.*; 30 31 public final class WeakMap_Test { 32 @Test test()33 public void test() { 34 WeakMap m = new WeakMap(); 35 assertTrue("", m.size() == 0); 36 assertTrue("", m.isEmpty()); 37 assertTrue("", !m.containsKey("key1")); 38 assertTrue("", !m.containsValue(null)); 39 WaitUnreachable u1 = new WaitUnreachable(new Object()); 40 m.put("key1", u1.get()); 41 WaitUnreachable u2 = new WaitUnreachable(new Disposable()); 42 m.put("key2", u2.get()); 43 assertTrue("", m.size() == 2); 44 assertTrue("", !m.isEmpty()); 45 assertTrue("", m.containsKey("key1")); 46 assertTrue("", m.containsKey("key2")); 47 assertTrue("", !m.containsKey("key3")); 48 assertTrue("", m.containsValue(m.get("key1"))); 49 assertTrue("", m.containsValue(m.get("key2"))); 50 assertTrue("", WeakMap.getValue(m.get("key1")).equals(u1.get())); 51 assertTrue("", WeakMap.getValue(m.get("key2")).equals(u2.get())); 52 assertTrue("", m.values().size() == 2); 53 assertTrue("", m.values().contains(m.get("key1"))); 54 assertTrue("", m.values().contains(m.get("key2"))); 55 u1.waitUnreachable(); 56 assertTrue("", WeakMap.getValue(m.get("key1")) == null); 57 ((Disposable) u2.get()).dispose(); 58 assertTrue("", WeakMap.getValue(m.get("key2")) == null); 59 m.clear(); 60 u2.waitUnreachable(); 61 assertTrue("", m.size() == 0); 62 m.put("key2", new Object()); 63 assertTrue("", m.size() == 1); 64 } 65 66 // This simple class (single listener, no synchronization) exploits 67 // knowledge about the implementation of WeakMap: 68 private static final class Disposable implements DisposeNotifier { addDisposeListener(DisposeListener listener)69 public void addDisposeListener(DisposeListener listener) { 70 this.listener = listener; 71 } 72 dispose()73 public void dispose() { 74 if (listener != null) { 75 listener.notifyDispose(this); 76 } 77 } 78 79 private DisposeListener listener = null; 80 } 81 } 82