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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 java.util.Collection;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* Basic implementation of the {@link SetMultimap} interface. It's a wrapper
* around {@link AbstractMapBasedMultimap} that converts the returned collections into
* {@code Sets}. The {@link #createCollection} method must return a {@code Set}.
*
* @author Jared Levy
*/
@GwtCompatible
abstract class AbstractSetMultimap<K, V>
extends AbstractMapBasedMultimap<K, V> implements SetMultimap<K, V> {
/**
* Creates a new multimap that uses the provided map.
*
* @param map place to store the mapping from each key to its corresponding
* values
*/
protected AbstractSetMultimap(Map<K, Collection<V>> map) {
super(map);
}
@Override abstract Set<V> createCollection();
@Override Set<V> createUnmodifiableEmptyCollection() {
return ImmutableSet.of();
}
// Following Javadoc copied from SetMultimap.
/**
* {@inheritDoc}
*
* <p>Because a {@code SetMultimap} has unique values for a given key, this
* method returns a {@link Set}, instead of the {@link Collection} specified
* in the {@link Multimap} interface.
*/
@Override public Set<V> get(@Nullable K key) {
return (Set<V>) super.get(key);
}
/**
* {@inheritDoc}
*
* <p>Because a {@code SetMultimap} has unique values for a given key, this
* method returns a {@link Set}, instead of the {@link Collection} specified
* in the {@link Multimap} interface.
*/
@Override public Set<Map.Entry<K, V>> entries() {
return (Set<Map.Entry<K, V>>) super.entries();
}
/**
* {@inheritDoc}
*
* <p>Because a {@code SetMultimap} has unique values for a given key, this
* method returns a {@link Set}, instead of the {@link Collection} specified
* in the {@link Multimap} interface.
*/
@Override public Set<V> removeAll(@Nullable Object key) {
return (Set<V>) super.removeAll(key);
}
/**
* {@inheritDoc}
*
* <p>Because a {@code SetMultimap} has unique values for a given key, this
* method returns a {@link Set}, instead of the {@link Collection} specified
* in the {@link Multimap} interface.
*
* <p>Any duplicates in {@code values} will be stored in the multimap once.
*/
@Override public Set<V> replaceValues(
@Nullable K key, Iterable<? extends V> values) {
return (Set<V>) super.replaceValues(key, values);
}
/**
* {@inheritDoc}
*
* <p>Though the method signature doesn't say so explicitly, the returned map
* has {@link Set} values.
*/
@Override public Map<K, Collection<V>> asMap() {
return super.asMap();
}
/**
* 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} if the method increased the size of the multimap, or
* {@code false} if the multimap already contained the key-value pair
*/
@Override public boolean put(@Nullable K key, @Nullable V value) {
return super.put(key, value);
}
/**
* Compares the specified object to this multimap for equality.
*
* <p>Two {@code SetMultimap} instances are equal if, for each key, they
* contain the same values. Equality does not depend on the ordering of keys
* or values.
*/
@Override public boolean equals(@Nullable Object object) {
return super.equals(object);
}
private static final long serialVersionUID = 7431625294878419160L;
}
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