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
030public abstract class TestUnhashableCollectionGenerator<T extends Collection<UnhashableObject>>
031    implements TestCollectionGenerator<UnhashableObject> {
032  @Override
033  public SampleElements<UnhashableObject> samples() {
034    return new Unhashables();
035  }
036
037  @Override
038  public T create(Object... elements) {
039    UnhashableObject[] array = createArray(elements.length);
040    int i = 0;
041    for (Object e : elements) {
042      array[i++] = (UnhashableObject) e;
043    }
044    return create(array);
045  }
046
047  /**
048   * Creates a new collection containing the given elements; implement this method instead of {@link
049   * #create(Object...)}.
050   */
051  protected abstract T create(UnhashableObject[] elements);
052
053  @Override
054  public UnhashableObject[] createArray(int length) {
055    return new UnhashableObject[length];
056  }
057
058  @Override
059  public Iterable<UnhashableObject> order(List<UnhashableObject> insertionOrder) {
060    return insertionOrder;
061  }
062}