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/*
* Copyright (c) 2015, 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.
*/
import java.io.*;
import java.lang.reflect.Field;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
/*
* @test
* @bug 8077559
* @summary Tests Compact String. This one is testing
* if Compact String enable/disable VM Options is indeed working in String class,
* it's verified by testing if the VM option affect coder and
* COMPACT_STRINGS field in String class.
* @modules java.base/java.lang:open
* @run testng/othervm -XX:+CompactStrings -DCompactStringEnabled=true VMOptionsTest
* @run testng/othervm -XX:-CompactStrings -DCompactStringEnabled=false VMOptionsTest
*/
public class VMOptionsTest {
boolean compactStringEnabled;
// corresponding "COMPACT_STRINGS" field in String class.
Field COMPACT_STRINGS;
// corresponding "coder" field in String class.
Field coder;
// corresponding coder type in String class.
final byte LATIN1 = 0;
final byte UTF16 = 1;
@BeforeClass
public void setUp() throws Exception {
compactStringEnabled = Boolean.valueOf(System.getProperty("CompactStringEnabled", null));
COMPACT_STRINGS = String.class.getDeclaredField("COMPACT_STRINGS");
COMPACT_STRINGS.setAccessible(true);
coder = String.class.getDeclaredField("coder");
coder.setAccessible(true);
}
@DataProvider
public Object[][] provider() {
return new Object[][] {
new Object[] {"", LATIN1},
new Object[] {"abc", LATIN1},
new Object[] {"A\uff21", UTF16},
new Object[] {"\uff21\uff22", UTF16}
};
}
/*
* verify the coder field in String objects.
*/
@Test(dataProvider = "provider")
public void testCoder(String str, byte expected) throws Exception {
byte c = (byte) coder.get(str);
expected = compactStringEnabled ? expected : UTF16;
assertEquals(c, expected);
}
/*
* verify the COMPACT_STRINGS flag in String objects.
*/
@Test(dataProvider = "provider")
public void testCompactStringFlag(String str, byte ignore) throws Exception {
assertTrue(COMPACT_STRINGS.get(str).equals(compactStringEnabled));
}
}
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