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Java example source code file (LongArrayAsListTest.java)

This example Java source code file (LongArrayAsListTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

gwt, gwtincompatible, list, listtestsuitebuilder, long, longsaslistgenerator, longsaslistheadsublistgenerator, longsaslistmiddlesublistgenerator, longsaslisttailsublistgenerator, override, sampleelements, samplelongs, testlonglistgenerator, testsuite, util

The LongArrayAsListTest.java Java example source code

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.primitives;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.testing.ListTestSuiteBuilder;
import com.google.common.collect.testing.SampleElements;
import com.google.common.collect.testing.TestListGenerator;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.ListFeature;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import java.util.List;

/**
 * Test suite covering {@link Longs#asList(long[])}.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible(emulated = true)
public class LongArrayAsListTest extends TestCase {

  private static List<Long> asList(Long[] values) {
    long[] temp = new long[values.length];
    for (int i = 0; i < values.length; i++) {
      temp[i] = checkNotNull(values[i]);  // checkNotNull for GWT (do not optimize).
    }
    return Longs.asList(temp);
  }

  @GwtIncompatible // suite
  public static Test suite() {
    List<ListTestSuiteBuilder builders =
        ImmutableList.of(
            ListTestSuiteBuilder.using(new LongsAsListGenerator())
                .named("Longs.asList"),

            ListTestSuiteBuilder.using(new LongsAsListHeadSubListGenerator())
                .named("Longs.asList, head subList"),

            ListTestSuiteBuilder.using(new LongsAsListTailSubListGenerator())
                .named("Longs.asList, tail subList"),

            ListTestSuiteBuilder.using(new LongsAsListMiddleSubListGenerator())
                .named("Longs.asList, middle subList")
            );

    TestSuite suite = new TestSuite();
    for (ListTestSuiteBuilder<Long> builder : builders) {
      suite.addTest(
          builder
          .withFeatures(CollectionSize.ONE,
                        CollectionSize.SEVERAL,
                        CollectionFeature.RESTRICTS_ELEMENTS,
                        ListFeature.SUPPORTS_SET)
          .createTestSuite());
    }
    return suite;
  }

  // Test generators.  To let the GWT test suite generator access them, they need to be
  // public named classes with a public default constructor.

  public static final class LongsAsListGenerator extends TestLongListGenerator {
    @Override protected List<Long> create(Long[] elements) {
      return asList(elements);
    }
  }

  public static final class LongsAsListHeadSubListGenerator extends TestLongListGenerator {
    @Override protected List<Long> create(Long[] elements) {
      Long[] suffix = {Long.MIN_VALUE, Long.MAX_VALUE};
      Long[] all = concat(elements, suffix);
      return asList(all).subList(0, elements.length);
    }
  }

  public static final class LongsAsListTailSubListGenerator extends TestLongListGenerator {
    @Override protected List<Long> create(Long[] elements) {
      Long[] prefix = {(long) 86, (long) 99};
      Long[] all = concat(prefix, elements);
      return asList(all).subList(2, elements.length + 2);
    }
  }

  public static final class LongsAsListMiddleSubListGenerator extends TestLongListGenerator {
    @Override protected List<Long> create(Long[] elements) {
      Long[] prefix = {Long.MIN_VALUE, Long.MAX_VALUE};
      Long[] suffix = {(long) 86, (long) 99};
      Long[] all = concat(concat(prefix, elements), suffix);
      return asList(all).subList(2, elements.length + 2);
    }
  }

  private static Long[] concat(Long[] left, Long[] right) {
    Long[] result = new Long[left.length + right.length];
    System.arraycopy(left, 0, result, 0, left.length);
    System.arraycopy(right, 0, result, left.length, right.length);
    return result;
  }

  public static abstract class TestLongListGenerator
      implements TestListGenerator<Long> {
    @Override
    public SampleElements<Long> samples() {
      return new SampleLongs();
    }

    @Override
    public List<Long> create(Object... elements) {
      Long[] array = new Long[elements.length];
      int i = 0;
      for (Object e : elements) {
        array[i++] = (Long) e;
      }
      return create(array);
    }

    /**
     * Creates a new collection containing the given elements; implement this
     * method instead of {@link #create(Object...)}.
     */
    protected abstract List<Long> create(Long[] elements);

    @Override
    public Long[] createArray(int length) {
      return new Long[length];
    }

    /** Returns the original element list, unchanged. */
    @Override
    public List<Long> order(List insertionOrder) {
      return insertionOrder;
    }
  }

  public static class SampleLongs extends SampleElements<Long> {
    public SampleLongs() {
      super((long) 0, (long) 1, (long) 2, (long) 3, (long) 4);
    }
  }
}

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