1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.utilities;
  26 
  27 import java.util.*;
  28 import sun.jvm.hotspot.debugger.*;
  29 import sun.jvm.hotspot.runtime.*;
  30 import sun.jvm.hotspot.oops.*;
  31 import sun.jvm.hotspot.types.*;
  32 
  33 public class GrowableArray<T> extends GenericGrowableArray {
  34   static {
  35     VM.registerVMInitializedObserver(new Observer() {
  36         public void update(Observable o, Object data) {
  37           initialize(VM.getVM().getTypeDataBase());
  38         }
  39       });
  40   }
  41 
  42   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  43     Type type      = db.lookupType("GrowableArray<int>");
  44     dataField = type.getAddressField("_data");
  45   }
  46 
  47   private static AddressField dataField;
  48 
  49   private InstanceConstructor<T> virtualConstructor;
  50 
  51   public static <S> GrowableArray<S> create(Address addr, InstanceConstructor<S> v) {
  52     if (addr == null) return null;
  53     return new GrowableArray<S>(addr, v);
  54   }
  55 
  56   public T at(int i) {
  57     if (i < 0 || i >= length()) throw new ArrayIndexOutOfBoundsException(i);
  58     Address data = dataField.getValue(getAddress());
  59     Address addr = data.getAddressAt(i * VM.getVM().getAddressSize());
  60     if (addr == null) return null;
  61     return (T) virtualConstructor.instantiateWrapperFor(addr);
  62   }
  63 
  64   private GrowableArray(Address addr, InstanceConstructor<T> v) {
  65     super(addr);
  66     virtualConstructor = v;
  67   }
  68 }