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 java.util.List;
021import java.util.Map;
022import java.util.Map.Entry;
023import java.util.Set;
024
025/**
026 * Creates map entries using sample keys and sample values.
027 *
028 * @author Jesse Wilson
029 */
030@GwtCompatible
031public abstract class TestMapEntrySetGenerator<K, V> implements TestSetGenerator<Map.Entry<K, V>> {
032  private final SampleElements<K> keys;
033  private final SampleElements<V> values;
034
035  protected TestMapEntrySetGenerator(SampleElements<K> keys, SampleElements<V> values) {
036    this.keys = keys;
037    this.values = values;
038  }
039
040  @Override
041  public SampleElements<Entry<K, V>> samples() {
042    return SampleElements.mapEntries(keys, values);
043  }
044
045  @Override
046  public Set<Entry<K, V>> create(Object... elements) {
047    Entry<K, V>[] entries = createArray(elements.length);
048    System.arraycopy(elements, 0, entries, 0, elements.length);
049    return createFromEntries(entries);
050  }
051
052  public abstract Set<Entry<K, V>> createFromEntries(Entry<K, V>[] entries);
053
054  @Override
055  @SuppressWarnings("unchecked") // generic arrays make typesafety sad
056  public Entry<K, V>[] createArray(int length) {
057    return new Entry[length];
058  }
059
060  /** Returns the original element list, unchanged. */
061  @Override
062  public List<Entry<K, V>> order(List<Entry<K, V>> insertionOrder) {
063    return insertionOrder;
064  }
065}