1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.car.internal.util; 18 19 import java.util.ArrayList; 20 import java.util.Collections; 21 22 // Copy from frameworks/base/core/java/com/google/android/collect 23 24 /** 25 * Provides static methods for creating {@code List} instances easily, and other 26 * utility methods for working with lists. 27 * 28 * @hide 29 */ 30 public class Lists { 31 32 /** 33 * Creates an empty {@code ArrayList} instance. 34 * 35 * <p><b>Note:</b> if you only need an <i>immutable</i> empty List, use 36 * {@link Collections#emptyList} instead. 37 * 38 * @return a newly-created, initially-empty {@code ArrayList} 39 */ newArrayList()40 public static <E> ArrayList<E> newArrayList() { 41 return new ArrayList<E>(); 42 } 43 44 /** 45 * Creates a resizable {@code ArrayList} instance containing the given 46 * elements. 47 * 48 * <p><b>Note:</b> due to a bug in javac 1.5.0_06, we cannot support the 49 * following: 50 * 51 * <p>{@code List<Base> list = Lists.newArrayList(sub1, sub2);} 52 * 53 * <p>where {@code sub1} and {@code sub2} are references to subtypes of 54 * {@code Base}, not of {@code Base} itself. To get around this, you must 55 * use: 56 * 57 * <p>{@code List<Base> list = Lists.<Base>newArrayList(sub1, sub2);} 58 * 59 * @param elements the elements that the list should contain, in order 60 * @return a newly-created {@code ArrayList} containing those elements 61 */ newArrayList(E... elements)62 public static <E> ArrayList<E> newArrayList(E... elements) { 63 int capacity = (elements.length * 110) / 100 + 5; 64 ArrayList<E> list = new ArrayList<E>(capacity); 65 Collections.addAll(list, elements); 66 return list; 67 } 68 } 69