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/*
* Copyright (c) 2019, 2020, 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
* @bug 8246774
* @summary Basic tests for writeReplace
* @run testng WriteReplaceTest
* @run testng/othervm/java.security.policy=empty_security.policy WriteReplaceTest
*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static java.lang.System.out;
import static org.testng.Assert.assertEquals;
public class WriteReplaceTest {
record R1 () implements Serializable {
Object writeReplace() { return new Replacement(); }
private static class Replacement implements Serializable {
private Object readResolve() { return new R1(); }
}
}
record R2 (int x, int y) implements Serializable {
Object writeReplace() { return new Ser(x, y); }
private static class Ser implements Serializable {
private final int x;
private final int y;
Ser(int x, int y) { this.x = x; this.y = y; }
private Object readResolve() { return new R2(x, y); }
}
}
record R3 (R1 r1, R2 r2) implements Serializable { }
record R4 (long l) implements Serializable {
Object writeReplace() { return new Replacement(l); }
static class Replacement implements Serializable {
long l;
Replacement(long l) { this.l = l; }
}
}
@DataProvider(name = "recordObjects")
public Object[][] recordObjects() {
return new Object[][] {
new Object[] { new R1(), R1.class },
new Object[] { new R2(1, 2), R2.class },
new Object[] { new R3(new R1(), new R2(3,4)), R3.class },
new Object[] { new R4(4L), R4.Replacement.class },
};
}
@Test(dataProvider = "recordObjects")
public void testSerialize(Object objectToSerialize, Class<?> expectedType)
throws Exception
{
out.println("\n---");
out.println("serializing : " + objectToSerialize);
Object deserializedObj = serializeDeserialize(objectToSerialize);
out.println("deserialized: " + deserializedObj);
if (objectToSerialize.getClass().equals(expectedType))
assertEquals(deserializedObj, objectToSerialize);
else
assertEquals(deserializedObj.getClass(), expectedType);
}
// -- null replacement
record R10 () implements Serializable {
Object writeReplace() { return null; }
}
@Test
public void testNull() throws Exception {
out.println("\n---");
Object objectToSerialize = new R10();
out.println("serializing : " + objectToSerialize);
Object deserializedObj = serializeDeserialize(objectToSerialize);
out.println("deserialized: " + deserializedObj);
assertEquals(deserializedObj, null);
}
// --- infra
static <T> byte[] serialize(T obj) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(obj);
oos.close();
return baos.toByteArray();
}
@SuppressWarnings("unchecked")
static <T> T deserialize(byte[] streamBytes)
throws IOException, ClassNotFoundException
{
ByteArrayInputStream bais = new ByteArrayInputStream(streamBytes);
ObjectInputStream ois = new ObjectInputStream(bais);
return (T) ois.readObject();
}
static <T> T serializeDeserialize(T obj)
throws IOException, ClassNotFoundException
{
return deserialize(serialize(obj));
}
}
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