/*
    * Copyright (C) 2009 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.SampleElements.Unhashables;
  
  import java.util.Collection;
  import java.util.List;
  
  /**
   * Creates collections containing unhashable sample elements, to be tested.
   *
   * @author Regina O'Dell
   */
  @GwtCompatible
  public abstract class
      TestUnhashableCollectionGenerator<T extends Collection<UnhashableObject>>
      implements TestCollectionGenerator<UnhashableObject> {
    @Override
    public SampleElements<UnhashableObject> samples() {
      return new Unhashables();
    }
  
    @Override
    public T create(Object... elements) {
      UnhashableObject[] array = createArray(elements.length);
      int i = 0;
      for (Object e : elements) {
        array[i++] = (UnhashableObject) e;
      }
      return create(array);
    }
  
    /**
     * Creates a new collection containing the given elements; implement this
     * method instead of {@link #create(Object...)}.
     */
    protected abstract T create(UnhashableObject[] elements);
  
    @Override
    public UnhashableObject[] createArray(int length) {
      return new UnhashableObject[length];
    }
  
    @Override
    public Iterable<UnhashableObject> order(
        List<UnhashableObject> insertionOrder) {
      return insertionOrder;
    }
  }