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63 lines
1.6 KiB
63 lines
1.6 KiB
/* |
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* Copyright 2002-2012 the original author or 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.fr.third.springframework.util; |
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import java.util.List; |
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import java.util.Map; |
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/** |
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* Extension of the {@code Map} interface that stores multiple values. |
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* |
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* @author Arjen Poutsma |
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* @since 3.0 |
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*/ |
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public interface MultiValueMap<K, V> extends Map<K, List<V>> { |
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/** |
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* Return the first value for the given key. |
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* @param key the key |
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* @return the first value for the specified key, or {@code null} |
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*/ |
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V getFirst(K key); |
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/** |
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* Add the given single value to the current list of values for the given key. |
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* @param key the key |
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* @param value the value to be added |
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*/ |
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void add(K key, V value); |
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/** |
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* Set the given single value under the given key. |
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* @param key the key |
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* @param value the value to set |
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*/ |
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void set(K key, V value); |
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/** |
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* Set the given values under. |
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* @param values the values. |
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*/ |
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void setAll(Map<K, V> values); |
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/** |
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* Returns the first values contained in this {@code MultiValueMap}. |
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* @return a single value representation of this map |
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*/ |
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Map<K, V> toSingleValueMap(); |
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}
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