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Java > Open Source Codes > com > hp > hpl > jena > graph > TripleBoundary


1 /*
2       (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP, all rights reserved.
3       [See end of file]
4       $Id: TripleBoundary.java,v 1.2 2005/02/21 11:51:56 andy_seaborne Exp $
5 */
6
7 package com.hp.hpl.jena.graph;
8
9 /**
10      An interface for expressing a stopping condition on triples, such as in
11      sub-graph extraction.
12       
13     @author hedgehog
14 */
15 public interface TripleBoundary
16     {
17     /**
18          Answer true if this triple is a stopping triple, and whatever search is using
19          this interface should proceed no further.
20     */
21     boolean stopAt( Triple t );
22     
23     /**
24          A TripleBoundary without limits - stopAt always returns false.
25     */
26     public static final TripleBoundary stopNowhere = new TripleBoundary()
27         { public boolean stopAt( Triple t ) { return false; } };
28     
29     /**
30         A TripleBoundary that stops at triples with anonymous objects.
31     */
32     public static final TripleBoundary stopAtAnonObject = new TripleBoundary()
33         { public boolean stopAt( Triple t ) { return t.getObject().isBlank(); } };
34
35     }
36
37 /*
38     (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP
39     All rights reserved.
40     
41     Redistribution and use in source and binary forms, with or without
42     modification, are permitted provided that the following conditions
43     are met:
44     
45     1. Redistributions of source code must retain the above copyright
46        notice, this list of conditions and the following disclaimer.
47     
48     2. Redistributions in binary form must reproduce the above copyright
49        notice, this list of conditions and the following disclaimer in the
50        documentation and/or other materials provided with the distribution.
51     
52     3. The name of the author may not be used to endorse or promote products
53        derived from this software without specific prior written permission.
54     
55     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
56     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
57     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
58     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
59     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
60     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
61     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
62     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
63     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
64     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
65 */
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