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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 readResolve
* @run testng ReadResolveTest
* @run testng/othervm/java.security.policy=empty_security.policy ReadResolveTest
*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serial;
import java.io.Serializable;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static java.lang.String.format;
import static java.lang.System.out;
import static org.testng.Assert.assertEquals;
/**
* Tests records being used as a serial proxy.
*/
public class ReadResolveTest {
static class C1 implements Serializable {
private final int x;
private final int y;
C1(int x, int y) { this.x = x; this.y = y; }
private record SerProxy1(int x, int y) implements Serializable {
@Serial
private Object readResolve() { return new C1(x, y); }
}
@Serial
private Object writeReplace() {
return new SerProxy1(x, y);
}
@Override
public boolean equals(Object obj) {
return obj != null && obj instanceof C1 && ((C1)obj).x == this.x && ((C1)obj).y == y;
}
@Override
public String toString() { return format("C1[x=%x, y=%d]", x, y); }
}
static class C2 implements Serializable {
private record SerProxy2() implements Serializable {
@Serial
private Object readResolve() { return new C2(); }
}
@Serial
private Object writeReplace() {
return new SerProxy2();
}
@Override
public boolean equals(Object obj) {
return obj != null && obj instanceof C2;
}
@Override
public String toString() { return "C2[]"; }
}
record R1 (int x, int y, String s) implements Serializable {
private record SerProxy3(int a, int b, String c) implements Serializable {
@Serial
private Object readResolve() { return new R1(a, b, c); }
}
@Serial
private Object writeReplace() {
return new SerProxy3(x, y, s);
}
}
@DataProvider(name = "objectsToSerialize")
public Object[][] objectsToSerialize() {
return new Object[][] {
new Object[] { new C1(3,4) },
new Object[] { new C2() },
new Object[] { new R1(5, 6, "c") }
};
}
@Test(dataProvider = "objectsToSerialize")
public void testSerialize(Object objectToSerialize) throws Exception {
out.println("\n---");
out.println("serializing : " + objectToSerialize);
Object deserializedObj = serializeDeserialize(objectToSerialize);
out.println("deserialized: " + deserializedObj);
assertEquals(deserializedObj, objectToSerialize);
}
// -- null replacement
record R10 () implements Serializable {
@Serial
private Object readResolve() {
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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