01: /******************************************************************
02: * File: FrameObject.java
03: * Created by: Dave Reynolds
04: * Created on: 18-Jul-2003
05: *
06: * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
07: * [See end of file]
08: * $Id: FrameObject.java,v 1.7 2008/01/02 12:06:16 andy_seaborne Exp $
09: *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.impl;
10:
11: /**
12: * Base class for stack frame objects. Originally this was used to provide
13: * pool-based allocated but it turns out the normal Java GC outperforms
14: * manual pool-based allocation anyway.
15: *
16: * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
17: * @version $Revision: 1.7 $ on $Date: 2008/01/02 12:06:16 $
18: */
19: public class FrameObject {
20:
21: /** Used to link the frame to the prior frame in the (tree) stack or the pool */
22: FrameObject link;
23:
24: /**
25: * Link this frame to an existing frame. In the future this might do some ref count
26: * tricks.
27: */
28: public void linkTo(FrameObject prior) {
29: link = prior;
30: }
31:
32: /**
33: * Link this frame to an existing frame. This will never do any funny ref count tricks.
34: */
35: public void fastLinkTo(FrameObject prior) {
36: link = prior;
37: }
38:
39: /**
40: * Return the prior frame in the tree.
41: */
42: public FrameObject getLink() {
43: return link;
44: }
45:
46: /**
47: * Close the frame actively. This frees any internal resources, frees this frame and
48: * frees the frame to which this is linked.
49: */
50: public void close() {
51: }
52:
53: }
54:
55: /*
56: (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
57: All rights reserved.
58:
59: Redistribution and use in source and binary forms, with or without
60: modification, are permitted provided that the following conditions
61: are met:
62:
63: 1. Redistributions of source code must retain the above copyright
64: notice, this list of conditions and the following disclaimer.
65:
66: 2. Redistributions in binary form must reproduce the above copyright
67: notice, this list of conditions and the following disclaimer in the
68: documentation and/or other materials provided with the distribution.
69:
70: 3. The name of the author may not be used to endorse or promote products
71: derived from this software without specific prior written permission.
72:
73: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
74: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
75: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
76: IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
77: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
78: NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
79: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
80: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
81: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
82: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
83: */
|