    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.collections4.keyvalue;
    018
    019import java.util.Map;
    020
    021import org.apache.commons.collections4.KeyValue;
    022
    023/**
    024 * A restricted implementation of {@link java.util.Map.Entry Map.Entry} that prevents
    025 * the {@link java.util.Map.Entry Map.Entry} contract from being broken.
    026 *
    027 * @param <K> the type of keys
    028 * @param <V> the type of mapped values
    029 * @since 3.0
    030 */
    031public final class DefaultMapEntry<K, V> extends AbstractMapEntry<K, V> {
    032
    033    /**
    034     * Constructs a new entry with the specified key and given value.
    035     *
    036     * @param key  the key for the entry, may be null
    037     * @param value  the value for the entry, may be null
    038     */
    039    public DefaultMapEntry(final K key, final V value) {
    040        super(key, value);
    041    }
    042
    043    /**
    044     * Constructs a new entry from the specified {@code KeyValue}.
    045     *
    046     * @param pair  the pair to copy, must not be null
    047     * @throws NullPointerException if the entry is null
    048     */
    049    public DefaultMapEntry(final KeyValue<? extends K, ? extends V> pair) {
    050        super(pair.getKey(), pair.getValue());
    051    }
    052
    053    /**
    054     * Constructs a new entry from the specified {@code Map.Entry}.
    055     *
    056     * @param entry  the entry to copy, must not be null
    057     * @throws NullPointerException if the entry is null
    058     */
    059    public DefaultMapEntry(final Map.Entry<? extends K, ? extends V> entry) {
    060        super(entry.getKey(), entry.getValue());
    061    }
    062
    063}