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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  
25  package sun.jvm.hotspot.utilities;
26  
27  import 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  
35  public 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  }