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.annotations.GwtIncompatible;
23import com.google.common.collect.ImmutableList;
24import com.google.common.collect.testing.ListTestSuiteBuilder;
25import com.google.common.collect.testing.SampleElements;
26import com.google.common.collect.testing.TestListGenerator;
27import com.google.common.collect.testing.features.CollectionFeature;
28import com.google.common.collect.testing.features.CollectionSize;
29import com.google.common.collect.testing.features.ListFeature;
30
31import junit.framework.Test;
32import junit.framework.TestCase;
33import junit.framework.TestSuite;
34
35import java.util.List;
36
37/**
38 * Test suite covering {@link Bytes#asList(byte[])}.
39 *
40 * @author Kevin Bourrillion
41 */
42@GwtCompatible(emulated = true)
43public class ByteArrayAsListTest extends TestCase {
44
45  private static List<Byte> asList(Byte[] values) {
46    byte[] temp = new byte[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 Bytes.asList(temp);
51  }
52
53  @GwtIncompatible("suite")
54  public static Test suite() {
55    List<ListTestSuiteBuilder<Byte>> builders =
56        ImmutableList.of(
57            ListTestSuiteBuilder.using(new BytesAsListGenerator())
58                .named("Bytes.asList"),
59
60            ListTestSuiteBuilder.using(new BytesAsListHeadSubListGenerator())
61                .named("Bytes.asList, head subList"),
62
63            ListTestSuiteBuilder.using(new BytesAsListTailSubListGenerator())
64                .named("Bytes.asList, tail subList"),
65
66            ListTestSuiteBuilder.using(new BytesAsListMiddleSubListGenerator())
67                .named("Bytes.asList, middle subList")
68        );
69
70    TestSuite suite = new TestSuite();
71    for (ListTestSuiteBuilder<Byte> builder : builders) {
72      suite.addTest(
73          builder
74          .withFeatures(CollectionSize.ONE,
75                        CollectionSize.SEVERAL,
76                        CollectionFeature.RESTRICTS_ELEMENTS,
77                        ListFeature.SUPPORTS_SET)
78          .createTestSuite());
79    }
80    return suite;
81  }
82
83  // Test generators.  To let the GWT test suite generator access them, they need to be
84  // public named classes with a public default constructor.
85
86  public static final class BytesAsListGenerator extends TestByteListGenerator {
87    @Override protected List<Byte> create(Byte[] elements) {
88      return asList(elements);
89    }
90  }
91
92  public static final class BytesAsListHeadSubListGenerator extends TestByteListGenerator {
93    @Override protected List<Byte> create(Byte[] elements) {
94      Byte[] suffix = {Byte.MIN_VALUE, Byte.MAX_VALUE};
95      Byte[] all = concat(elements, suffix);
96      return asList(all).subList(0, elements.length);
97    }
98  }
99
100  public static final class BytesAsListTailSubListGenerator extends TestByteListGenerator {
101    @Override protected List<Byte> create(Byte[] elements) {
102      Byte[] prefix = {(byte) 86, (byte) 99};
103      Byte[] all = concat(prefix, elements);
104      return asList(all).subList(2, elements.length + 2);
105    }
106  }
107
108  public static final class BytesAsListMiddleSubListGenerator extends TestByteListGenerator {
109    @Override protected List<Byte> create(Byte[] elements) {
110      Byte[] prefix = {Byte.MIN_VALUE, Byte.MAX_VALUE};
111      Byte[] suffix = {(byte) 86, (byte) 99};
112      Byte[] all = concat(concat(prefix, elements), suffix);
113      return asList(all).subList(2, elements.length + 2);
114    }
115  }
116
117  private static Byte[] concat(Byte[] left, Byte[] right) {
118    Byte[] result = new Byte[left.length + right.length];
119    System.arraycopy(left, 0, result, 0, left.length);
120    System.arraycopy(right, 0, result, left.length, right.length);
121    return result;
122  }
123
124  public static abstract class TestByteListGenerator
125      implements TestListGenerator<Byte> {
126    @Override
127    public SampleElements<Byte> samples() {
128      return new SampleBytes();
129    }
130
131    @Override
132    public List<Byte> create(Object... elements) {
133      Byte[] array = new Byte[elements.length];
134      int i = 0;
135      for (Object e : elements) {
136        array[i++] = (Byte) e;
137      }
138      return create(array);
139    }
140
141    /**
142     * Creates a new collection containing the given elements; implement this
143     * method instead of {@link #create(Object...)}.
144     */
145    protected abstract List<Byte> create(Byte[] elements);
146
147    @Override
148    public Byte[] createArray(int length) {
149      return new Byte[length];
150    }
151
152    /** Returns the original element list, unchanged. */
153    @Override
154    public List<Byte> order(List<Byte> insertionOrder) {
155      return insertionOrder;
156    }
157  }
158
159  public static class SampleBytes extends SampleElements<Byte> {
160    public SampleBytes() {
161      super((byte) 0, (byte) 1, (byte) 2, (byte) 3, (byte) 4);
162    }
163  }
164}
165