1/* 2 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* 25 * @test 26 * @bug 8004504 27 * @summary Ensure that ListBuffer is working properly 28 * @modules jdk.compiler/com.sun.tools.javac.util 29 */ 30 31import com.sun.tools.javac.util.List; 32import com.sun.tools.javac.util.ListBuffer; 33import java.util.Iterator; 34import java.util.Objects; 35 36public class ListBufferTest { 37 public static void main(String... args) { 38 testRemove(); 39 testCopiedEndsWithList_nil(); 40 } 41 42 private static void testCopiedEndsWithList_nil() { 43 ListBuffer<String> lb = new ListBuffer<>(); 44 45 lb.add("a"); 46 lb.add("b"); 47 lb.add("c"); 48 49 List<String> l1 = lb.toList(); 50 51 assertListEquals(l1, "a", "b", "c"); 52 assertEndsWithNil(l1); 53 54 lb.add("d"); 55 56 List<String> l2 = lb.toList(); 57 assertListEquals(l2, "a", "b", "c", "d"); 58 assertEndsWithNil(l2); 59 assertListEquals(l1, "a", "b", "c"); 60 } 61 62 private static void testRemove() { 63 ListBuffer<String> lb1 = new ListBuffer<>(); 64 65 lb1.add("a"); 66 lb1.add("b"); 67 lb1.add("c"); 68 69 assertListEquals(lb1.toList(), "a", "b", "c"); 70 assertEquals(lb1.next(), "a"); 71 assertListEquals(lb1.toList(), "b", "c"); 72 assertEquals(lb1.next(), "b"); 73 assertListEquals(lb1.toList(), "c"); 74 assertEquals(lb1.next(), "c"); 75 assertListEquals(lb1.toList()); 76 assertEquals(lb1.next(), null); 77 78 lb1.add("d"); 79 80 assertEquals(lb1.next(), "d"); 81 } 82 83 private static void assertEndsWithNil(List<?> list) { 84 while (!list.isEmpty()) { 85 list = list.tail; 86 } 87 88 if (list != List.nil()) throw new IllegalStateException("Not ending with List.nil()"); 89 } 90 91 private static <T> void assertListEquals(Iterable<T> list, T... data) { 92 int i = 0; 93 Iterator<T> it = list.iterator(); 94 95 while (it.hasNext() && i < data.length) { 96 assertEquals(it.next(), data[i++]); 97 } 98 99 if (it.hasNext()) { 100 throw new IllegalStateException("Too many elements in the list"); 101 } 102 103 if (i < data.length) { 104 throw new IllegalStateException("Too few elements in the list"); 105 } 106 } 107 108 private static void assertEquals(Object expected, Object actual) { 109 if (!Objects.equals(expected, actual)) { 110 throw new IllegalStateException("Incorrect content. Expected: " + expected + ", actual: " + actual); 111 } 112 } 113} 114