1/*
2 * Copyright (C) 2012 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package libcore.java.util;
18
19import java.io.Serializable;
20import java.util.AbstractCollection;
21import java.util.Collections;
22import java.util.Iterator;
23import java.util.concurrent.atomic.AtomicBoolean;
24import java.util.concurrent.ConcurrentHashMap;
25import junit.framework.TestCase;
26
27public final class AbstractCollectionTest extends TestCase {
28  // http://code.google.com/p/android/issues/detail?id=36519
29  public void test_toArray() throws Exception {
30    final ConcurrentHashMap<Integer, Integer> m = new ConcurrentHashMap<Integer, Integer>();
31    final AtomicBoolean finished = new AtomicBoolean(false);
32
33    Thread reader = new Thread(new Runnable() {
34      @Override public void run() {
35        while (!finished.get()) {
36          m.values().toArray();
37          m.values().toArray(new Integer[m.size()]);
38        }
39      }
40    });
41
42    Thread mutator = new Thread(new Runnable() {
43      @Override public void run() {
44        for (int i = 0; i < 100; ++i) {
45          m.put(-i, -i);
46        }
47        for (int i = 0; i < 4096; ++i) {
48          m.put(i, i);
49          m.remove(i);
50        }
51        finished.set(true);
52      }
53    });
54
55    reader.start();
56    mutator.start();
57    reader.join();
58    mutator.join();
59  }
60
61  // http://b/31052838
62  public void test_empty_removeAll_null() {
63    try {
64      new EmptyCollection().removeAll(null);
65      fail("Should have thrown");
66    } catch (NullPointerException expected) {
67    }
68  }
69
70  // http://b/31052838
71  public void test_empty_retainAll_null() {
72    try {
73      new EmptyCollection().retainAll(null);
74      fail("Should have thrown");
75    } catch (NullPointerException expected) {
76    }
77  }
78
79  /**
80   * An AbstractCollection that does not override removeAll() / retainAll().
81   */
82  private static class EmptyCollection extends AbstractCollection<Object> {
83    @Override public Iterator iterator() { return Collections.emptySet().iterator(); }
84    @Override public int size() { return 0; }
85  }
86
87}
88