ByteArrayAsListTest.java revision 1d580d0f6ee4f21eb309ba7b509d2c6d671c4044 
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 Bytes#asList(byte[])}.
38 *
39 * @author Kevin Bourrillion
40 */
41@GwtCompatible
42public class ByteArrayAsListTest extends TestCase {
43
44  private static List<Byte> asList(Byte[] values) {
45    byte[] temp = new byte[values.length];
46    for (int i = 0; i < values.length; i++) {
47      temp[i] = checkNotNull(values[i]);  // checkNotNull for GWT (do not optimize).
48    }
49    return Bytes.asList(temp);
50  }
51
52  public static Test suite() {
53    List<ListTestSuiteBuilder<Byte>> builders =
54        ImmutableList.of(
55            ListTestSuiteBuilder.using(new BytesAsListGenerator())
56                .named("Bytes.asList"),
57
58            ListTestSuiteBuilder.using(new BytesAsListHeadSubListGenerator())
59                .named("Bytes.asList, head subList"),
60
61            ListTestSuiteBuilder.using(new BytesAsListTailSubListGenerator())
62                .named("Bytes.asList, tail subList"),
63
64            ListTestSuiteBuilder.using(new BytesAsListMiddleSubListGenerator())
65                .named("Bytes.asList, middle subList")
66        );
67
68    TestSuite suite = new TestSuite();
69    for (ListTestSuiteBuilder<Byte> builder : builders) {
70      suite.addTest(
71          builder
72          .withFeatures(CollectionSize.ONE,
73                        CollectionSize.SEVERAL,
74                        CollectionFeature.RESTRICTS_ELEMENTS,
75                        ListFeature.SUPPORTS_SET)
76          .createTestSuite());
77    }
78    return suite;
79  }
80
81  // Test generators.  To let the GWT test suite generator access them, they need to be
82  // public named classes with a public default constructor.
83
84  public static final class BytesAsListGenerator extends TestByteListGenerator {
85    @Override protected List<Byte> create(Byte[] elements) {
86      return asList(elements);
87    }
88  }
89
90  public static final class BytesAsListHeadSubListGenerator extends TestByteListGenerator {
91    @Override protected List<Byte> create(Byte[] elements) {
92      Byte[] suffix = {Byte.MIN_VALUE, Byte.MAX_VALUE};
93      Byte[] all = concat(elements, suffix);
94      return asList(all).subList(0, elements.length);
95    }
96  }
97
98  public static final class BytesAsListTailSubListGenerator extends TestByteListGenerator {
99    @Override protected List<Byte> create(Byte[] elements) {
100      Byte[] prefix = {(byte) 86, (byte) 99};
101      Byte[] all = concat(prefix, elements);
102      return asList(all).subList(2, elements.length + 2);
103    }
104  }
105
106  public static final class BytesAsListMiddleSubListGenerator extends TestByteListGenerator {
107    @Override protected List<Byte> create(Byte[] elements) {
108      Byte[] prefix = {Byte.MIN_VALUE, Byte.MAX_VALUE};
109      Byte[] suffix = {(byte) 86, (byte) 99};
110      Byte[] all = concat(concat(prefix, elements), suffix);
111      return asList(all).subList(2, elements.length + 2);
112    }
113  }
114
115  private static Byte[] concat(Byte[] left, Byte[] right) {
116    Byte[] result = new Byte[left.length + right.length];
117    System.arraycopy(left, 0, result, 0, left.length);
118    System.arraycopy(right, 0, result, left.length, right.length);
119    return result;
120  }
121
122  public static abstract class TestByteListGenerator
123      implements TestListGenerator<Byte> {
124    @Override
125    public SampleElements<Byte> samples() {
126      return new SampleBytes();
127    }
128
129    @Override
130    public List<Byte> create(Object... elements) {
131      Byte[] array = new Byte[elements.length];
132      int i = 0;
133      for (Object e : elements) {
134        array[i++] = (Byte) e;
135      }
136      return create(array);
137    }
138
139    /**
140     * Creates a new collection containing the given elements; implement this
141     * method instead of {@link #create(Object...)}.
142     */
143    protected abstract List<Byte> create(Byte[] elements);
144
145    @Override
146    public Byte[] createArray(int length) {
147      return new Byte[length];
148    }
149
150    /** Returns the original element list, unchanged. */
151    @Override
152    public List<Byte> order(List<Byte> insertionOrder) {
153      return insertionOrder;
154    }
155  }
156
157  public static class SampleBytes extends SampleElements<Byte> {
158    public SampleBytes() {
159      super((byte) 0, (byte) 1, (byte) 2, (byte) 3, (byte) 4);
160    }
161  }
162}
163