/*

 * Copyright (c) 2011, 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.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.types.*;

public class GrowableArray<T> extends GenericGrowableArray {

  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 {

    Type type      = db.lookupType("GrowableArray<int>");

    dataField = type.getAddressField("_data");

  }

  private static AddressField dataField;

  private InstanceConstructor<T> virtualConstructor;

  public static <S> GrowableArray<S> create(Address addr, InstanceConstructor<S> v) {

    if (addr == null) return null;

    return new GrowableArray<S>(addr, v);

  }

  public T at(int i) {

    if (i < 0 || i >= length()) throw new ArrayIndexOutOfBoundsException(i);

    Address data = dataField.getValue(getAddress());

    Address addr = data.getAddressAt(i * VM.getVM().getAddressSize());

    if (addr == null) return null;

    return (T) virtualConstructor.instantiateWrapperFor(addr);

  }

  private GrowableArray(Address addr, InstanceConstructor<T> v) {

    super(addr);

    virtualConstructor = v;

  }

  public Address getData() {

    return dataField.getValue(getAddress());

  }

}