GrowableArray.java revision 11988:d5d417cc0d95 
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25package sun.jvm.hotspot.utilities;
26
27import java.util.*;
28import sun.jvm.hotspot.debugger.*;
29import sun.jvm.hotspot.runtime.*;
30import sun.jvm.hotspot.oops.*;
31import sun.jvm.hotspot.types.*;
32
33public 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  public Address getData() {
69    return dataField.getValue(getAddress());
70  }
71}
72