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