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.testing.SampleElements;
23import com.google.common.collect.testing.TestListGenerator;
24
25import junit.framework.TestCase;
26
27import java.util.List;
28
29/**
30 * Test suite covering {@link Ints#asList(int[])}.
31 *
32 * @author Kevin Bourrillion
33 */
34@GwtCompatible(emulated = true)
35@SuppressWarnings("cast") // redundant casts are intentional and harmless
36public class IntArrayAsListTest extends TestCase {
37
38  private static List<Integer> asList(Integer[] values) {
39    int[] temp = new int[values.length];
40    for (int i = 0; i < values.length; i++) {
41      temp[i] = checkNotNull(values[i]);  // checkNotNull for GWT (do not optimize).
42    }
43    return Ints.asList(temp);
44  }
45
46  // Test generators.  To let the GWT test suite generator access them, they need to be
47  // public named classes with a public default constructor.
48
49  public static final class IntsAsListGenerator extends TestIntegerListGenerator {
50    @Override protected List<Integer> create(Integer[] elements) {
51      return asList(elements);
52    }
53  }
54
55  public static final class IntsAsListHeadSubListGenerator extends TestIntegerListGenerator {
56    @Override protected List<Integer> create(Integer[] elements) {
57      Integer[] suffix = {Integer.MIN_VALUE, Integer.MAX_VALUE};
58      Integer[] all = concat(elements, suffix);
59      return asList(all).subList(0, elements.length);
60    }
61  }
62
63  public static final class IntsAsListTailSubListGenerator extends TestIntegerListGenerator {
64    @Override protected List<Integer> create(Integer[] elements) {
65      Integer[] prefix = {(int) 86, (int) 99};
66      Integer[] all = concat(prefix, elements);
67      return asList(all).subList(2, elements.length + 2);
68    }
69  }
70
71  public static final class IntsAsListMiddleSubListGenerator extends TestIntegerListGenerator {
72    @Override protected List<Integer> create(Integer[] elements) {
73      Integer[] prefix = {Integer.MIN_VALUE, Integer.MAX_VALUE};
74      Integer[] suffix = {(int) 86, (int) 99};
75      Integer[] all = concat(concat(prefix, elements), suffix);
76      return asList(all).subList(2, elements.length + 2);
77    }
78  }
79
80  private static Integer[] concat(Integer[] left, Integer[] right) {
81    Integer[] result = new Integer[left.length + right.length];
82    System.arraycopy(left, 0, result, 0, left.length);
83    System.arraycopy(right, 0, result, left.length, right.length);
84    return result;
85  }
86
87  public static abstract class TestIntegerListGenerator
88      implements TestListGenerator<Integer> {
89    @Override
90    public SampleElements<Integer> samples() {
91      return new SampleIntegers();
92    }
93
94    @Override
95    public List<Integer> create(Object... elements) {
96      Integer[] array = new Integer[elements.length];
97      int i = 0;
98      for (Object e : elements) {
99        array[i++] = (Integer) e;
100      }
101      return create(array);
102    }
103
104    /**
105     * Creates a new collection containing the given elements; implement this
106     * method instead of {@link #create(Object...)}.
107     */
108    protected abstract List<Integer> create(Integer[] elements);
109
110    @Override public Integer[] createArray(int length) {
111      return new Integer[length];
112    }
113
114    /** Returns the original element list, unchanged. */
115    @Override
116    public List<Integer> order(List<Integer> insertionOrder) {
117      return insertionOrder;
118    }
119  }
120
121  public static class SampleIntegers extends SampleElements<Integer> {
122    public SampleIntegers() {
123      super((int) 0, (int) 1, (int) 2, (int) 3, (int) 4);
124    }
125  }
126}
127
128