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 
17 package com.google.common.primitives;
18 
19 import static com.google.common.base.Preconditions.checkNotNull;
20 
21 import com.google.common.annotations.GwtCompatible;
22 import com.google.common.annotations.GwtIncompatible;
23 import com.google.common.collect.ImmutableList;
24 import com.google.common.collect.testing.ListTestSuiteBuilder;
25 import com.google.common.collect.testing.SampleElements;
26 import com.google.common.collect.testing.TestListGenerator;
27 import com.google.common.collect.testing.features.CollectionFeature;
28 import com.google.common.collect.testing.features.CollectionSize;
29 import com.google.common.collect.testing.features.ListFeature;
30 
31 import junit.framework.Test;
32 import junit.framework.TestCase;
33 import junit.framework.TestSuite;
34 
35 import java.util.List;
36 
37 /**
38  * Test suite covering {@link Bytes#asList(byte[])}.
39  *
40  * @author Kevin Bourrillion
41  */
42 @GwtCompatible(emulated = true)
43 public class ByteArrayAsListTest extends TestCase {
44 
asList(Byte[] values)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")
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 {
create(Byte[] elements)87     @Override protected List<Byte> create(Byte[] elements) {
88       return asList(elements);
89     }
90   }
91 
92   public static final class BytesAsListHeadSubListGenerator extends TestByteListGenerator {
create(Byte[] elements)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 {
create(Byte[] elements)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 {
create(Byte[] elements)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 
concat(Byte[] left, Byte[] right)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
samples()127     public SampleElements<Byte> samples() {
128       return new SampleBytes();
129     }
130 
131     @Override
create(Object... elements)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      */
create(Byte[] elements)145     protected abstract List<Byte> create(Byte[] elements);
146 
147     @Override
createArray(int length)148     public Byte[] createArray(int length) {
149       return new Byte[length];
150     }
151 
152     /** Returns the original element list, unchanged. */
153     @Override
order(List<Byte> insertionOrder)154     public List<Byte> order(List<Byte> insertionOrder) {
155       return insertionOrder;
156     }
157   }
158 
159   public static class SampleBytes extends SampleElements<Byte> {
SampleBytes()160     public SampleBytes() {
161       super((byte) 0, (byte) 1, (byte) 2, (byte) 3, (byte) 4);
162     }
163   }
164 }
165