Quelle Test4679556.java Sprache: JAVA

/*
* Copyright (c) 2004, 2013, 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 4679556
* @summary Tests for duplication of some kind instances
* @run main/othervm -Djava.security.manager=allow Test4679556
* @author Sergey Malenkov, Mark Davidson, Philip Milne
*/

import java.beans.DefaultPersistenceDelegate;
import java.beans.Encoder;
import java.beans.Expression;
import java.beans.XMLEncoder;

/**
* Demonstrates the archiver bug, where the XMLEncoder duplicates
* the instance of class A because it is required as the target of
* a factory method (to produce an instance of class C).
* See the output in the file Test.xml for the results and note
* the (invalid) forward reference to the instance of class C.
*
* TO FIX
*
* Move the first line of the XMLEncoder::mark(Statement method)
* to the end of the method.
* I.e. replace the mark() method in XMLEncoder with this:
* <pre>private void mark(Statement stm) {
*     Object[] args = stm.getArguments();
*     for (int i = 0; i < args.length; i++) {
*         Object arg = args[i];
*         mark(arg, true);
*     }
*     mark(stm.getTarget(), false);
* }</pre>
*
* VALID ARCHIVE (WITH FIX):
* <pre><?xml version="1.0" encoding="UTF-8"?>
* <java version="1.4.0" class="java.beans.XMLDecoder">
*  <object class="TestDuplicates$A">
*   <void id="TestDuplicates$C0" method="createC"/>
*   <void property="x">
*    <void property="x">
*     <object idref="TestDuplicates$C0"/>
*    </void>
*   </void>
*  </object>
* </java></pre>
*
* INVALID ARCHIVE (WITHOUT FIX):
*  <object class="TestDuplicates$A">
*   <void property="x">
*    <void property="x">
*     <void class="TestDuplicates$A">
*      <void property="x">
*       <void property="x">
*        <object idref="TestDuplicates$C0"/>
*       </void>
*      </void>
*      <void id="TestDuplicates$C0" method="createC"/>
*     </void>
*     <object idref="TestDuplicates$C0"/>
*    </void>
*   </void>
*   <void id="TestDuplicates$C0" method="createC"/>
*  </object>
* </java></pre>
*/
public class Test4679556 extends AbstractTest {
    public static void main(String[] args) {
        new Test4679556().test(true);
    }

    protected Object getObject() {
        A a = new A();
        B b = (B) a.getX();
        b.setX(a.createC());
        return a;
    }

    protected Object getAnotherObject() {
        return new A();
    }

    protected void initialize(XMLEncoder encoder) {
        encoder.setPersistenceDelegate(C.class, new DefaultPersistenceDelegate() {
            protected Expression instantiate(Object oldInstance, Encoder out) {
                C c = (C) oldInstance;
                return new Expression(c, c.getX(), "createC", new Object[] {});
            }
        });
    }

    public static class Base {
        private Object x;

        public Object getX() {
            return this.x;
        }

        public void setX(Object x) {
            this.x = x;
        }
    }

    public static class A extends Base {
        public A() {
            setX(new B());
        }

        public C createC() {
            return new C(this);
        }
    }

    public static class B extends Base {
    }

    public static class C extends Base {
        private C(Object x) {
            setX(x);
        }
    }
}

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