LivenessPathElement.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2001, 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 sun.jvm.hotspot.oops.*;
28
29/** Describes an element in a {@link
30    sun.jvm.hotspot.utilities.LivenessPath}. It indicates that the
31    field in the given object leads to the next element in the
32    path. Root elements do not have an object; the terminal element in
33    the path does not have a field identifier. */
34
35public class LivenessPathElement {
36  LivenessPathElement(Oop obj, FieldIdentifier id) {
37    this.obj = obj;
38    this.id  = id;
39  }
40
41  public boolean isRoot() {
42    return (obj == null);
43  }
44
45  public boolean isTerminal() {
46    return (id == null);
47  }
48
49  public Oop getObj() {
50    return obj;
51  }
52
53  public FieldIdentifier getField() {
54    return id;
55  }
56
57  //---------------------------------------------------------------------------
58  // Internals only below this point
59  //
60  private Oop             obj;
61  private FieldIdentifier id;
62}
63