| /* |
| * Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @summary This exercises String#repeat patterns and limits. |
| * @run main/othervm StringRepeat |
| */ |
| |
| /* |
| * @test |
| * @summary This exercises String#repeat patterns with 16 * 1024 * 1024 repeats. |
| * @requires os.maxMemory >= 2G |
| * @run main/othervm -Xmx2g StringRepeat 16777216 |
| */ |
| |
| import java.nio.CharBuffer; |
| |
| public class StringRepeat { |
| public static void main(String... args) { |
| if (args.length > 0) { |
| REPEATS = new int[args.length]; |
| for (int i = 0; i < args.length; ++i) { |
| REPEATS[i] = Integer.parseInt(args[i]); |
| } |
| } |
| test1(); |
| test2(); |
| } |
| |
| /* |
| * Default varitions of repeat count. |
| */ |
| static int[] REPEATS = { |
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, |
| 32, 64, 128, 256, 512, 1024, 64 * 1024, 1024 * 1024 |
| }; |
| |
| /* |
| * Varitions of Strings. |
| */ |
| static String[] STRINGS = new String[] { |
| "", "\0", " ", "a", "$", "\u2022", |
| "ab", "abc", "abcd", "abcde", |
| "The quick brown fox jumps over the lazy dog." |
| }; |
| |
| /* |
| * Repeat String function tests. |
| */ |
| static void test1() { |
| for (int repeat : REPEATS) { |
| for (String string : STRINGS) { |
| long limit = (long)string.length() * (long)repeat; |
| |
| if ((long)(Integer.MAX_VALUE >> 1) <= limit) { |
| break; |
| } |
| |
| verify(string.repeat(repeat), string, repeat); |
| } |
| } |
| } |
| |
| /* |
| * Repeat String exception tests. |
| */ |
| static void test2() { |
| try { |
| "abc".repeat(-1); |
| throw new RuntimeException("No exception for negative repeat count"); |
| } catch (IllegalArgumentException ex) { |
| // Correct |
| } |
| |
| try { |
| "abc".repeat(Integer.MAX_VALUE - 1); |
| throw new RuntimeException("No exception for large repeat count"); |
| } catch (OutOfMemoryError ex) { |
| // Correct |
| } |
| } |
| |
| static String truncate(String string) { |
| if (string.length() < 80) { |
| return string; |
| } |
| return string.substring(0, 80) + "..."; |
| } |
| |
| /* |
| * Verify string repeat patterns. |
| */ |
| static void verify(String result, String string, int repeat) { |
| if (string.isEmpty() || repeat == 0) { |
| if (!result.isEmpty()) { |
| System.err.format("\"%s\".repeat(%d)%n", truncate(string), repeat); |
| System.err.format("Result \"%s\"%n", truncate(result)); |
| System.err.format("Result expected to be empty, found string of length %d%n", result.length()); |
| throw new RuntimeException(); |
| } |
| } else { |
| int expected = 0; |
| int count = 0; |
| for (int offset = result.indexOf(string, expected); |
| 0 <= offset; |
| offset = result.indexOf(string, expected)) { |
| count++; |
| if (offset != expected) { |
| System.err.format("\"%s\".repeat(%d)%n", truncate(string), repeat); |
| System.err.format("Result \"%s\"%n", truncate(result)); |
| System.err.format("Repeat expected at %d, found at = %d%n", expected, offset); |
| throw new RuntimeException(); |
| } |
| expected += string.length(); |
| } |
| if (count != repeat) { |
| System.err.format("\"%s\".repeat(%d)%n", truncate(string), repeat); |
| System.err.format("Result \"%s\"%n", truncate(result)); |
| System.err.format("Repeat count expected to be %d, found %d%n", repeat, count); |
| throw new RuntimeException(); |
| } |
| } |
| } |
| } |