001/*
002 * Copyright (C) 2008 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing;
018
019import com.google.common.annotations.GwtCompatible;
020import com.google.common.collect.testing.features.CollectionSize;
021import java.util.ArrayList;
022import java.util.Arrays;
023import java.util.Collection;
024import java.util.List;
025import org.checkerframework.checker.nullness.qual.Nullable;
026
027/**
028 * Generator for collection of a particular size.
029 *
030 * @author George van den Driessche
031 */
032@GwtCompatible
033@ElementTypesAreNonnullByDefault
034public final class OneSizeGenerator<T, E extends @Nullable Object>
035    implements OneSizeTestContainerGenerator<T, E> {
036  private final TestContainerGenerator<T, E> generator;
037  private final CollectionSize collectionSize;
038
039  public OneSizeGenerator(TestContainerGenerator<T, E> generator, CollectionSize collectionSize) {
040    this.generator = generator;
041    this.collectionSize = collectionSize;
042  }
043
044  @Override
045  public TestContainerGenerator<T, E> getInnerGenerator() {
046    return generator;
047  }
048
049  @Override
050  public SampleElements<E> samples() {
051    return generator.samples();
052  }
053
054  @Override
055  public T create(Object... elements) {
056    return generator.create(elements);
057  }
058
059  @Override
060  public E[] createArray(int length) {
061    return generator.createArray(length);
062  }
063
064  @Override
065  public T createTestSubject() {
066    Collection<E> elements = getSampleElements(getCollectionSize().getNumElements());
067    return generator.create(elements.toArray());
068  }
069
070  @Override
071  public Collection<E> getSampleElements(int howMany) {
072    SampleElements<E> samples = samples();
073    List<E> allSampleElements =
074        Arrays.asList(samples.e0(), samples.e1(), samples.e2(), samples.e3(), samples.e4());
075    return new ArrayList<>(allSampleElements.subList(0, howMany));
076  }
077
078  @Override
079  public CollectionSize getCollectionSize() {
080    return collectionSize;
081  }
082
083  @Override
084  public Iterable<E> order(List<E> insertionOrder) {
085    return generator.order(insertionOrder);
086  }
087}