guava

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/*
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 * Copyright (C) 2008 The Guava Authors
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.google.common.collect.testing;
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import com.google.common.annotations.GwtCompatible;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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import org.checkerframework.checker.nullness.qual.Nullable;
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/**
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 * Creates map entries using sample keys and sample values.
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 *
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 * @author Jesse Wilson
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 */
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@GwtCompatible
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@ElementTypesAreNonnullByDefault
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public abstract class TestMapEntrySetGenerator<
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        K extends @Nullable Object, V extends @Nullable Object>
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    implements TestSetGenerator<Map.Entry<K, V>> {
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  private final SampleElements<K> keys;
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  private final SampleElements<V> values;
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  protected TestMapEntrySetGenerator(SampleElements<K> keys, SampleElements<V> values) {
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    this.keys = keys;
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    this.values = values;
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  }
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  @Override
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  public SampleElements<Entry<K, V>> samples() {
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    return SampleElements.mapEntries(keys, values);
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  }
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  @Override
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  public Set<Entry<K, V>> create(Object... elements) {
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    Entry<K, V>[] entries = createArray(elements.length);
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    System.arraycopy(elements, 0, entries, 0, elements.length);
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    return createFromEntries(entries);
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  }
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  public abstract Set<Entry<K, V>> createFromEntries(Entry<K, V>[] entries);
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  @Override
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  @SuppressWarnings("unchecked") // generic arrays make typesafety sad
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  public Entry<K, V>[] createArray(int length) {
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    return (Entry<K, V>[]) new Entry<?, ?>[length];
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  }
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  /** Returns the original element list, unchanged. */
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  @Override
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  public List<Entry<K, V>> order(List<Entry<K, V>> insertionOrder) {
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    return insertionOrder;
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  }
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}
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