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Java > Open Source Codes > com > hp > hpl > jena > rdf > model > StatementBoundaryBase


1 /*
2   (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP, all rights reserved.
3   [See end of file]
4   $Id: StatementBoundaryBase.java,v 1.2 2005/02/21 12:14:28 andy_seaborne Exp $
5 */
6 package com.hp.hpl.jena.rdf.model;
7
8 import com.hp.hpl.jena.graph.Triple;
9 import com.hp.hpl.jena.graph.TripleBoundary;
10
11 /**
12     StatementBoundaryBase - a base class for StatementBoundarys, with
13     built-in converstion to triples and a continueWith as well as a stopAt.
14     
15     @author kers
16 */
17 public abstract class StatementBoundaryBase implements StatementBoundary
18     {
19     /**
20          Method to over-ride to define what stops the boundary search; default
21          definition is !continueWith(s). <i>exactly one</code> of these two methods
22          must be defined.
23     */
24     public boolean stopAt( Statement s )
25         { return !continueWith( s ); }
26
27     /**
28          Method to over-ride to define what continues the boundary search; default
29          definition is !stopAt(s). <i>exactly one</code> of these two methods
30          must be defined.
31     */
32     public boolean continueWith( Statement s )
33         { return !stopAt( s ); }
34     
35     /**
36          Expresses this StatementBoundary as a TripleBoundary.
37     */
38     public final TripleBoundary asTripleBoundary( Model m )
39         { return convert( m, this ); }
40
41     /**
42          Answer a TripleBoundary that is implemented in terms of a StatementBoundary.
43     */
44     public static TripleBoundary convert( final Model s, final StatementBoundary b )
45         {
46         return new TripleBoundary()
47             { public boolean stopAt( Triple t ) { return b.stopAt( s.asStatement( t ) ); } };
48         }
49     }
50
51 /*
52     (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP
53     All rights reserved.
54     
55     Redistribution and use in source and binary forms, with or without
56     modification, are permitted provided that the following conditions
57     are met:
58     
59     1. Redistributions of source code must retain the above copyright
60        notice, this list of conditions and the following disclaimer.
61     
62     2. Redistributions in binary form must reproduce the above copyright
63        notice, this list of conditions and the following disclaimer in the
64        documentation and/or other materials provided with the distribution.
65     
66     3. The name of the author may not be used to endorse or promote products
67        derived from this software without specific prior written permission.
68     
69     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
70     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
71     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
72     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
73     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
74     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
75     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
76     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
77     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
78     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
79 */
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