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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.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A {@code Multimap} that cannot hold duplicate key-value pairs. Adding a key-value pair that's
 * already in the multimap has no effect. See the {@link Multimap} documentation for information
 * common to all multimaps.
 *
 * 

The {@link #get}, {@link #removeAll}, and {@link #replaceValues} methods each return a {@link * Set} of values, while {@link #entries} returns a {@code Set} of map entries. Though the method * signature doesn't say so explicitly, the map returned by {@link #asMap} has {@code Set} values. * *

If the values corresponding to a single key should be ordered according to a {@link * java.util.Comparator} (or the natural order), see the {@link SortedSetMultimap} subinterface. * *

Since the value collections are sets, the behavior of a {@code SetMultimap} is not specified * if key or value objects already present in the multimap change in a manner that affects * {@code equals} comparisons. Use caution if mutable objects are used as keys or values in a {@code * SetMultimap}. * *

Warning: Do not modify either a key or a value of a {@code SetMultimap} in a way * that affects its {@link Object#equals} behavior. Undefined behavior and bugs will result. * *

See the Guava User Guide article on {@code Multimap}. * * @author Jared Levy * @since 2.0 */ @GwtCompatible @ElementTypesAreNonnullByDefault public interface SetMultimap extends Multimap { /** * {@inheritDoc} * *

Because a {@code SetMultimap} has unique values for a given key, this method returns a * {@link Set}, instead of the {@link java.util.Collection} specified in the {@link Multimap} * interface. */ @Override Set get(@ParametricNullness K key); /** * {@inheritDoc} * *

Because a {@code SetMultimap} has unique values for a given key, this method returns a * {@link Set}, instead of the {@link java.util.Collection} specified in the {@link Multimap} * interface. */ @CanIgnoreReturnValue @Override Set removeAll(@CheckForNull Object key); /** * {@inheritDoc} * *

Because a {@code SetMultimap} has unique values for a given key, this method returns a * {@link Set}, instead of the {@link java.util.Collection} specified in the {@link Multimap} * interface. * *

Any duplicates in {@code values} will be stored in the multimap once. */ @CanIgnoreReturnValue @Override Set replaceValues(@ParametricNullness K key, Iterable values); /** * {@inheritDoc} * *

Because a {@code SetMultimap} has unique values for a given key, this method returns a * {@link Set}, instead of the {@link java.util.Collection} specified in the {@link Multimap} * interface. */ @Override Set> entries(); /** * {@inheritDoc} * *

Note: The returned map's values are guaranteed to be of type {@link Set}. To obtain * this map with the more specific generic type {@code Map>}, call {@link * Multimaps#asMap(SetMultimap)} instead. */ @Override Map> asMap(); /** * Compares the specified object to this multimap for equality. * *

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. * *

An empty {@code SetMultimap} is equal to any other empty {@code Multimap}, including an * empty {@code ListMultimap}. */ @Override boolean equals(@CheckForNull Object obj); }





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