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Java example source code file (OneSizeGenerator.java)

This example Java source code file (OneSizeGenerator.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

collectionsize, gwtcompatible, iterable, list, onesizegenerator, onesizetestcontainergenerator, override, sampleelements, suppresswarnings, testcontainergenerator, util

The OneSizeGenerator.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.collect.testing;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.features.CollectionSize;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

/**
 * Generator for collection of a particular size.
 *
 * @author George van den Driessche
 */
@GwtCompatible
public final class OneSizeGenerator<T, E> implements OneSizeTestContainerGenerator {
  private final TestContainerGenerator<T, E> generator;
  private final CollectionSize collectionSize;

  public OneSizeGenerator(TestContainerGenerator<T, E> generator, CollectionSize collectionSize) {
    this.generator = generator;
    this.collectionSize = collectionSize;
  }

  @Override
  public TestContainerGenerator<T, E> getInnerGenerator() {
    return generator;
  }

  @Override
  public SampleElements<E> samples() {
    return generator.samples();
  }

  @Override
  public T create(Object... elements) {
    return generator.create(elements);
  }

  @Override
  public E[] createArray(int length) {
    return generator.createArray(length);
  }

  @Override
  public T createTestSubject() {
    Collection<E> elements = getSampleElements(getCollectionSize().getNumElements());
    return generator.create(elements.toArray());
  }

  @Override
  public Collection<E> getSampleElements(int howMany) {
    SampleElements<E> samples = samples();
    @SuppressWarnings("unchecked")
    List<E> allSampleElements =
        Arrays.asList(samples.e0(), samples.e1(), samples.e2(), samples.e3(), samples.e4());
    return new ArrayList<E>(allSampleElements.subList(0, howMany));
  }

  @Override
  public CollectionSize getCollectionSize() {
    return collectionSize;
  }

  @Override
  public Iterable<E> order(List insertionOrder) {
    return generator.order(insertionOrder);
  }
}

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