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/*
* Copyright (c) 2018, 2022, 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
* @requires vm.bits == "64"
* @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();
}
}
}
}
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