001/*
002 * Copyright (C) 2009 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.SampleElements.Unhashables;
021import java.util.Collection;
022import java.util.List;
023
024/**
025 * Creates collections containing unhashable sample elements, to be tested.
026 *
027 * @author Regina O'Dell
028 */
029@GwtCompatible
030@ElementTypesAreNonnullByDefault
031public abstract class TestUnhashableCollectionGenerator<T extends Collection<UnhashableObject>>
032    implements TestCollectionGenerator<UnhashableObject> {
033  @Override
034  public SampleElements<UnhashableObject> samples() {
035    return new Unhashables();
036  }
037
038  @Override
039  public T create(Object... elements) {
040    UnhashableObject[] array = createArray(elements.length);
041    int i = 0;
042    for (Object e : elements) {
043      array[i++] = (UnhashableObject) e;
044    }
045    return create(array);
046  }
047
048  /**
049   * Creates a new collection containing the given elements; implement this method instead of {@link
050   * #create(Object...)}.
051   */
052  protected abstract T create(UnhashableObject[] elements);
053
054  @Override
055  public UnhashableObject[] createArray(int length) {
056    return new UnhashableObject[length];
057  }
058
059  @Override
060  public Iterable<UnhashableObject> order(List<UnhashableObject> insertionOrder) {
061    return insertionOrder;
062  }
063}