/*

 * Copyright (c) 1997, 2008, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

/*

 * The Original Code is HAT. The Initial Developer of the

 * Original Code is Bill Foote, with contributions from others

 * at JavaSoft/Sun.

 */

package com.sun.tools.hat.internal.model;

import com.sun.tools.hat.internal.util.Misc;

/**

 * A forward reference to an object.  This is an intermediate representation

 * for a JavaThing, when we have the thing's ID, but we might not have read

 * the thing yet.

 *

 * @author      Bill Foote

 */

public class JavaObjectRef extends JavaThing {

    private long id;

    public JavaObjectRef(long id) {

        this.id = id;

    }

    public long getId() {

        return id;

    }

    public boolean isHeapAllocated() {

        return true;

    }

    public JavaThing dereference(Snapshot snapshot, JavaField field) {

        return dereference(snapshot, field, true);

    }

    public JavaThing dereference(Snapshot snapshot, JavaField field, boolean verbose) {

        if (field != null && !field.hasId()) {

            // If this happens, we must be a field that represents an int.

            // (This only happens with .bod-style files)

            return new JavaLong(id);

        }

        if (id == 0) {

            return snapshot.getNullThing();

        }

        JavaThing result = snapshot.findThing(id);

        if (result == null) {

            if (!snapshot.getUnresolvedObjectsOK() && verbose) {

                String msg = "WARNING:  Failed to resolve object id "

                                + Misc.toHex(id);

                if (field != null) {

                    msg += " for field " + field.getName()

                            + " (signature " + field.getSignature() + ")";

                }

                System.out.println(msg);

                // Thread.dumpStack();

            }

            result = new HackJavaValue("Unresolved object "

                                        + Misc.toHex(id), 0);

        }

        return result;

    }

    public int getSize() {

        return 0;

    }

    public String toString() {

        return "Unresolved object " + Misc.toHex(id);

    }

}