/*

 * Copyright (c) 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.utilities;

import java.util.Observable;

import java.util.Observer;

import sun.jvm.hotspot.debugger.Address;

import sun.jvm.hotspot.oops.Metadata;

import sun.jvm.hotspot.oops.Klass;

import sun.jvm.hotspot.runtime.VM;

import sun.jvm.hotspot.types.Type;

import sun.jvm.hotspot.types.TypeDataBase;

import sun.jvm.hotspot.types.WrongTypeException;

public class KlassArray extends GenericArray {

  static {

    VM.registerVMInitializedObserver(new Observer() {

      public void update(Observable o, Object data) {

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

      }

    });

  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {

    elemType = db.lookupType("Klass*");

    Type type = db.lookupType("Array<Klass*>");

    dataFieldOffset = type.getAddressField("_data").getOffset();

  }

  private static long dataFieldOffset;

  protected static Type elemType;

  public KlassArray(Address addr) {

    super(addr, dataFieldOffset);

  }

  public Klass getAt(int i) {

    return (Klass) Metadata.instantiateWrapperFor(getAddressAt(i));

  }

  public Type getElemType() {

    return elemType;

  }

}