1/*
2 * Copyright (C) 2008 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.primitives;
18
19import static com.google.common.base.Preconditions.checkNotNull;
20
21import com.google.common.annotations.GwtCompatible;
22import com.google.common.collect.ImmutableList;
23import com.google.common.collect.testing.ListTestSuiteBuilder;
24import com.google.common.collect.testing.SampleElements;
25import com.google.common.collect.testing.TestListGenerator;
26import com.google.common.collect.testing.features.CollectionFeature;
27import com.google.common.collect.testing.features.CollectionSize;
28import com.google.common.collect.testing.features.ListFeature;
29
30import junit.framework.Test;
31import junit.framework.TestCase;
32import junit.framework.TestSuite;
33
34import java.util.List;
35
36/**
37 * Test suite covering {@link Ints#asList(int[])}.
38 *
39 * @author Kevin Bourrillion
40 */
41@GwtCompatible
42@SuppressWarnings("cast") // redundant casts are intentional and harmless
43public class IntArrayAsListTest extends TestCase {
44
45  private static List<Integer> asList(Integer[] values) {
46    int[] temp = new int[values.length];
47    for (int i = 0; i < values.length; i++) {
48      temp[i] = checkNotNull(values[i]);  // checkNotNull for GWT (do not optimize).
49    }
50    return Ints.asList(temp);
51  }
52
53  public static Test suite() {
54    List<ListTestSuiteBuilder<Integer>> builders =
55        ImmutableList.of(
56            ListTestSuiteBuilder.using(new IntsAsListGenerator())
57                .named("Ints.asList"),
58
59            ListTestSuiteBuilder.using(new IntsAsListHeadSubListGenerator())
60                .named("Ints.asList, head subList"),
61
62            ListTestSuiteBuilder.using(new IntsAsListTailSubListGenerator())
63                .named("Ints.asList, tail subList"),
64
65            ListTestSuiteBuilder.using(new IntsAsListMiddleSubListGenerator())
66                .named("Ints.asList, middle subList")
67        );
68
69    TestSuite suite = new TestSuite();
70    for (ListTestSuiteBuilder<Integer> builder : builders) {
71      suite.addTest(
72          builder
73          .withFeatures(CollectionSize.ONE,
74                        CollectionSize.SEVERAL,
75                        CollectionFeature.RESTRICTS_ELEMENTS,
76                        ListFeature.SUPPORTS_SET)
77          .createTestSuite());
78    }
79    return suite;
80  }
81
82  // Test generators.  To let the GWT test suite generator access them, they need to be
83  // public named classes with a public default constructor.
84
85  public static final class IntsAsListGenerator extends TestIntegerListGenerator {
86    @Override protected List<Integer> create(Integer[] elements) {
87      return asList(elements);
88    }
89  }
90
91  public static final class IntsAsListHeadSubListGenerator extends TestIntegerListGenerator {
92    @Override protected List<Integer> create(Integer[] elements) {
93      Integer[] suffix = {Integer.MIN_VALUE, Integer.MAX_VALUE};
94      Integer[] all = concat(elements, suffix);
95      return asList(all).subList(0, elements.length);
96    }
97  }
98
99  public static final class IntsAsListTailSubListGenerator extends TestIntegerListGenerator {
100    @Override protected List<Integer> create(Integer[] elements) {
101      Integer[] prefix = {(int) 86, (int) 99};
102      Integer[] all = concat(prefix, elements);
103      return asList(all).subList(2, elements.length + 2);
104    }
105  }
106
107  public static final class IntsAsListMiddleSubListGenerator extends TestIntegerListGenerator {
108    @Override protected List<Integer> create(Integer[] elements) {
109      Integer[] prefix = {Integer.MIN_VALUE, Integer.MAX_VALUE};
110      Integer[] suffix = {(int) 86, (int) 99};
111      Integer[] all = concat(concat(prefix, elements), suffix);
112      return asList(all).subList(2, elements.length + 2);
113    }
114  }
115
116  private static Integer[] concat(Integer[] left, Integer[] right) {
117    Integer[] result = new Integer[left.length + right.length];
118    System.arraycopy(left, 0, result, 0, left.length);
119    System.arraycopy(right, 0, result, left.length, right.length);
120    return result;
121  }
122
123  public static abstract class TestIntegerListGenerator
124      implements TestListGenerator<Integer> {
125    @Override
126    public SampleElements<Integer> samples() {
127      return new SampleIntegers();
128    }
129
130    @Override
131    public List<Integer> create(Object... elements) {
132      Integer[] array = new Integer[elements.length];
133      int i = 0;
134      for (Object e : elements) {
135        array[i++] = (Integer) e;
136      }
137      return create(array);
138    }
139
140    /**
141     * Creates a new collection containing the given elements; implement this
142     * method instead of {@link #create(Object...)}.
143     */
144    protected abstract List<Integer> create(Integer[] elements);
145
146    @Override public Integer[] createArray(int length) {
147      return new Integer[length];
148    }
149
150    /** Returns the original element list, unchanged. */
151    @Override
152    public List<Integer> order(List<Integer> insertionOrder) {
153      return insertionOrder;
154    }
155  }
156
157  public static class SampleIntegers extends SampleElements<Integer> {
158    public SampleIntegers() {
159      super((int) 0, (int) 1, (int) 2, (int) 3, (int) 4);
160    }
161  }
162}
163