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/*
* Copyright (C) 2007 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;
import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Basic implementation of the {@link ListMultimap} interface. It's a wrapper around {@link
* AbstractMapBasedMultimap} that converts the returned collections into {@code Lists}. The {@link
* #createCollection} method must return a {@code List}.
*
* @author Jared Levy
* @since 2.0
*/
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class AbstractListMultimap
extends AbstractMapBasedMultimap implements ListMultimap {
/**
* Creates a new multimap that uses the provided map.
*
* @param map place to store the mapping from each key to its corresponding values
*/
protected AbstractListMultimap(Map> map) {
super(map);
}
@Override
abstract List createCollection();
@Override
List createUnmodifiableEmptyCollection() {
return Collections.emptyList();
}
@Override
Collection unmodifiableCollectionSubclass(
Collection collection) {
return Collections.unmodifiableList((List) collection);
}
@Override
Collection wrapCollection(@ParametricNullness K key, Collection collection) {
return wrapList(key, (List) collection, null);
}
// Following Javadoc copied from ListMultimap.
/**
* {@inheritDoc}
*
* Because the values for a given key may have duplicates and follow the insertion ordering,
* this method returns a {@link List}, instead of the {@link Collection} specified in the {@link
* Multimap} interface.
*/
@Override
public List get(@ParametricNullness K key) {
return (List) super.get(key);
}
/**
* {@inheritDoc}
*
* Because the values for a given key may have duplicates and follow the insertion ordering,
* this method returns a {@link List}, instead of the {@link Collection} specified in the {@link
* Multimap} interface.
*/
@CanIgnoreReturnValue
@Override
public List removeAll(@CheckForNull Object key) {
return (List) super.removeAll(key);
}
/**
* {@inheritDoc}
*
* Because the values for a given key may have duplicates and follow the insertion ordering,
* this method returns a {@link List}, instead of the {@link Collection} specified in the {@link
* Multimap} interface.
*/
@CanIgnoreReturnValue
@Override
public List replaceValues(@ParametricNullness K key, Iterable values) {
return (List) super.replaceValues(key, values);
}
/**
* Stores a key-value pair in the multimap.
*
* @param key key to store in the multimap
* @param value value to store in the multimap
* @return {@code true} always
*/
@CanIgnoreReturnValue
@Override
public boolean put(@ParametricNullness K key, @ParametricNullness V value) {
return super.put(key, value);
}
/**
* {@inheritDoc}
*
* Though the method signature doesn't say so explicitly, the returned map has {@link List}
* values.
*/
@Override
public Map> asMap() {
return super.asMap();
}
/**
* Compares the specified object to this multimap for equality.
*
* Two {@code ListMultimap} instances are equal if, for each key, they contain the same values
* in the same order. If the value orderings disagree, the multimaps will not be considered equal.
*/
@Override
public boolean equals(@CheckForNull Object object) {
return super.equals(object);
}
private static final long serialVersionUID = 6588350623831699109L;
}