/*
    * 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 java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Creates map entries using sample keys and sample values.
   *
   * @author Jesse Wilson
   */
  @GwtCompatible
  public abstract class TestMapEntrySetGenerator<K, V>
      implements TestSetGenerator<Map.Entry<K, V>> {
    private final SampleElements<K> keys;
    private final SampleElements<V> values;
  
    protected TestMapEntrySetGenerator(
        SampleElements<K> keys, SampleElements<V> values) {
      this.keys = keys;
      this.values = values;
    }
  
    @Override
    public SampleElements<Map.Entry<K, V>> samples() {
      return SampleElements.mapEntries(keys, values);
    }
  
    @Override
    public Set<Map.Entry<K, V>> create(Object... elements) {
      Map.Entry<K, V>[] entries = createArray(elements.length);
      System.arraycopy(elements, 0, entries, 0, elements.length);
      return createFromEntries(entries);
    }
  
    public abstract Set<Map.Entry<K, V>> createFromEntries(
        Map.Entry<K, V>[] entries);
  
    @Override
    @SuppressWarnings("unchecked") // generic arrays make typesafety sad
    public Map.Entry<K, V>[] createArray(int length) {
      return new Map.Entry[length];
    }
  
    /** Returns the original element list, unchanged. */
    @Override
    public List<Map.Entry<K, V>> order(List<Map.Entry<K, V>> insertionOrder) {
      return insertionOrder;
    }
  }