/*

 * Copyright (c) 2002, 2012, 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.

 *

 */

package sun.jvm.hotspot.runtime;

import java.util.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.types.*;

public class JNIid extends VMObject {

  private static MetadataField holder;

  private static AddressField next;

  private static CIntegerField offset;

  private static MetadataField resolvedMethod;

  private static MetadataField resolvedReceiver;

  private ObjectHeap heap;

  static {

    VM.registerVMInitializedObserver(new Observer() {

        public void update(Observable o, Object data) {

          initialize(VM.getVM().getTypeDataBase());

        }

      });

  }

  private static synchronized void initialize(TypeDataBase db) {

    // FIXME: JNIid has been removed as part of redesign of JNI method,

    // field ID generation. Please refer to src/share/vm/prims/jniId.hpp/.cpp

    // For now, commenting out the below code.

    /***********************************************************

    Type type = db.lookupType("JNIid");

    holder = type.getOopField("_holder");

    next = type.getAddressField("_next");

    offset = type.getCIntegerField("_offset");

    resolvedMethod = type.getOopField("_resolved_method");

    resolvedReceiver = type.getOopField("_resolved_receiver");

    ***********************************************************/

  }

  public JNIid(Address addr, ObjectHeap heap) {

    super(addr);

    this.heap = heap;

  }

  public JNIid next() {

    Address nextAddr = next.getValue(addr);

    if (nextAddr == null) {

      return null;

    }

    return new JNIid(nextAddr, heap);

  }

  public Klass     holder()           { return (Klass) holder.getValue(addr); }

  public int       offset()           { return (int) offset.getValue(addr); }

  public Method    method() {

    return ((InstanceKlass) holder()).getMethods().at(offset());

  }

  public Method    resolvedMethod()   { return (Method)resolvedMethod.getValue(addr); }

  public Klass     resolvedReceiver() { return (Klass) resolvedReceiver.getValue(addr); }

}