001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau.utils; 014 015import java.util.*; 016 017/** 018 * An extension of {@link LinkedHashMap} with a convenience {@link #append(Object,Object)} method. 019 * 020 * <p> 021 * Primarily used for testing purposes for quickly creating populated maps. 022 * <p class='bcode w800'> 023 * <jc>// Example:</jc> 024 * Map<String,Integer> m = <jk>new</jk> AMap<String,Integer>() 025 * .append(<js>"foo"</js>,1).append(<js>"bar"</js>,2); 026 * </p> 027 * 028 * @param <K> The key type. 029 * @param <V> The value type. 030 */ 031public final class AMap<K,V> extends LinkedHashMap<K,V> { 032 033 // TODO - Change to 1L in 8.0 034 private static final long serialVersionUID = 7344180601810042208L; 035 036 /** 037 * Creates an empty map. 038 * 039 * @return A new empty map. 040 */ 041 public static <K,V> AMap<K,V> create() { 042 return new AMap<>(); 043 } 044 045 /** 046 * Creates a map with one entry. 047 * 048 * @param key Entry key. 049 * @param value Entry value. 050 * @return A new map with one entry. 051 */ 052 public static <K,V> AMap<K,V> create(K key, V value) { 053 return new AMap<K,V>().append(key, value); 054 } 055 056 /** 057 * Adds an entry to this map. 058 * 059 * @param k The key. 060 * @param v The value. 061 * @return This object (for method chaining). 062 */ 063 public AMap<K,V> append(K k, V v) { 064 put(k, v); 065 return this; 066 } 067}