107 lines
3.6 KiB
Java
107 lines
3.6 KiB
Java
/*
|
|
* 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
|
|
* @bug 8201793 8285690
|
|
* @summary Test Reference::clone to throw CloneNotSupportedException
|
|
*/
|
|
|
|
import java.lang.ref.*;
|
|
|
|
public class ReferenceClone {
|
|
private static final ReferenceQueue<Object> QUEUE = new ReferenceQueue<>();
|
|
public static void main(String... args) {
|
|
ReferenceClone refClone = new ReferenceClone();
|
|
refClone.test();
|
|
}
|
|
|
|
public void test() {
|
|
// test Reference::clone that throws CNSE
|
|
Object o = new Object();
|
|
assertCloneNotSupported(new SoftRef(o));
|
|
assertCloneNotSupported(new WeakRef(o));
|
|
assertCloneNotSupported(new PhantomRef(o));
|
|
|
|
// Reference subclass may override the clone method
|
|
CloneableReference ref = new CloneableReference(o);
|
|
try {
|
|
ref.clone();
|
|
} catch (CloneNotSupportedException e) {
|
|
throw new RuntimeException("CloneableReference::clone should not throw CloneNotSupportedException");
|
|
}
|
|
}
|
|
|
|
private void assertCloneNotSupported(CloneableRef ref) {
|
|
try {
|
|
ref.clone();
|
|
throw new RuntimeException("Reference::clone should throw CloneNotSupportedException");
|
|
} catch (CloneNotSupportedException e) {}
|
|
}
|
|
|
|
// override clone to be public that throws CNSE
|
|
interface CloneableRef extends Cloneable {
|
|
public Object clone() throws CloneNotSupportedException;
|
|
}
|
|
|
|
class SoftRef extends SoftReference<Object> implements CloneableRef {
|
|
public SoftRef(Object referent) {
|
|
super(referent, QUEUE);
|
|
}
|
|
public Object clone() throws CloneNotSupportedException {
|
|
return super.clone();
|
|
}
|
|
}
|
|
|
|
class WeakRef extends WeakReference<Object> implements CloneableRef {
|
|
public WeakRef(Object referent) {
|
|
super(referent, QUEUE);
|
|
}
|
|
public Object clone() throws CloneNotSupportedException {
|
|
return super.clone();
|
|
}
|
|
}
|
|
|
|
class PhantomRef extends PhantomReference<Object> implements CloneableRef {
|
|
public PhantomRef(Object referent) {
|
|
super(referent, QUEUE);
|
|
}
|
|
|
|
public Object clone() throws CloneNotSupportedException {
|
|
return super.clone();
|
|
}
|
|
}
|
|
|
|
// override clone to return a new instance
|
|
class CloneableReference extends WeakReference<Object> implements Cloneable {
|
|
public CloneableReference(Object referent) {
|
|
super(referent, QUEUE);
|
|
}
|
|
|
|
public Object clone() throws CloneNotSupportedException {
|
|
return new CloneableReference(this.get());
|
|
}
|
|
}
|
|
|
|
}
|