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 LinkedList} with a convenience {@link #append(Object)} method.
019 *
020 * <p>
021 * Primarily used for testing purposes for quickly creating populated lists.
022 * <p class='bcode w800'>
023 *    <jc>// Example:</jc>
024 *    List&lt;String&gt; l = <jk>new</jk> AList&lt;String&gt;().append(<js>"foo"</js>).append(<js>"bar"</js>);
025 * </p>
026 *
027 * @param <T> The entry type.
028 */
029@SuppressWarnings({"serial","unchecked"})
030public final class AList<T> extends LinkedList<T> {
031
032   /**
033    * Convenience method for creating a list of objects.
034    *
035    * @param t The initial values.
036    * @return A new list.
037    */
038   @SafeVarargs
039   public static <T> AList<T> create(T...t) {
040      return new AList<T>().appendAll(t);
041   }
042
043   /**
044    * Adds an entry to this list.
045    *
046    * @param t The entry to add to this list.
047    * @return This object (for method chaining).
048    */
049   public AList<T> append(T t) {
050      add(t);
051      return this;
052   }
053
054   /**
055    * Adds multiple entries to this list.
056    *
057    * @param t The entries to add to this list.
058    * @return This object (for method chaining).
059    */
060   public AList<T> appendAll(T...t) {
061      addAll(Arrays.asList(t));
062      return this;
063   }
064
065   /**
066    * Adds an entry to this list if the boolean flag is <jk>true</jk>.
067    *
068    * @param b The boolean flag.
069    * @param val The value to add.
070    * @return This object (for method chaining).
071    */
072   public AList<T> appendIf(boolean b, T val) {
073      if (b)
074         append(val);
075      return this;
076   }
077}