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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.collections4;

import java.util.Set;

/**
 * Defines a map that holds a set of values against each key.
 * 

* A {@code SetValuedMap} is a Map with slightly different semantics: *

    *
  • Putting a value into the map will add the value to a {@link Set} at that key.
  • *
  • Getting a value will return a {@link Set}, holding all the values put to that key.
  • *
* * @since 4.1 * @version $Id: SetValuedMap.java 1685299 2015-06-13 18:27:11Z tn $ */ public interface SetValuedMap extends MultiValuedMap { /** * Gets the set of values associated with the specified key. *

* Implementations typically return an empty {@code Set} if no values * have been mapped to the key. *

* * @param key the key to retrieve * @return the {@code Set} of values, implementations should return an * empty {@code Set} for no mapping * @throws NullPointerException if the key is null and null keys are invalid */ @Override Set get(K key); /** * Removes all values associated with the specified key. *

* The returned set may be modifiable, but updates will not be * propagated to this set-valued map. In case no mapping was stored for the * specified key, an empty, unmodifiable set will be returned. * * @param key the key to remove values from * @return the {@code Set} of values removed, implementations should * return null for no mapping found, but may return an empty collection * @throws UnsupportedOperationException if the map is unmodifiable * @throws NullPointerException if the key is null and null keys are invalid */ @Override Set remove(Object key); }





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