TestStringSetGenerator.java revision 3c77433663281544363151bf284b0240dfd22a42 
1/*
2 * Copyright (C) 2007 The Guava Authors
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 com.google.common.collect.testing;
18
19import com.google.common.annotations.GwtCompatible;
20import com.google.common.collect.testing.SampleElements.Strings;
21
22import java.util.List;
23import java.util.Set;
24
25/**
26 * Create string sets for collection tests.
27 *
28 * <p>This class is GWT compatible.
29 *
30 * @author Kevin Bourrillion
31 */
32@GwtCompatible
33public abstract class TestStringSetGenerator implements TestSetGenerator<String>
34{
35  @Override
36  public SampleElements<String> samples() {
37    return new Strings();
38  }
39
40  @Override
41  public Set<String> create(Object... elements) {
42    String[] array = new String[elements.length];
43    int i = 0;
44    for (Object e : elements) {
45      array[i++] = (String) e;
46    }
47    return create(array);
48  }
49
50  protected abstract Set<String> create(String[] elements);
51
52  @Override
53  public String[] createArray(int length) {
54    return new String[length];
55  }
56
57  /**
58   * {@inheritDoc}
59   *
60   * <p>By default, returns the supplied elements in their given order; however,
61   * generators for containers with a known order other than insertion order
62   * must override this method.
63   *
64   * <p>Note: This default implementation is overkill (but valid) for an
65   * unordered container. An equally valid implementation for an unordered
66   * container is to throw an exception. The chosen implementation, however, has
67   * the advantage of working for insertion-ordered containers, as well.
68   */
69  @Override
70  public List<String> order(List<String> insertionOrder) {
71    return insertionOrder;
72  }
73}
74