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


1 /*
2   (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
3   [See end of file]
4   $Id: Node_Variable.java,v 1.11 2005/02/21 11:51:56 andy_seaborne Exp $
5 */
6
7 package com.hp.hpl.jena.graph;
8
9 /**
10     "variable" nodes; these are outside the RDF2003 specification, but are
11     used internally for "placeholder" nodes where blank nodes would be
12     wrong, most specifically in Query.
13     @author kers
14 */
15
16 public class Node_Variable extends Node_Fluid
17     {
18     protected Node_Variable( Object JavaDoc name )
19         { super( name ); }
20
21     public String JavaDoc getName()
22         { return ((VariableName) label).name; }
23     
24     public Object JavaDoc visitWith( NodeVisitor v )
25         { return v.visitVariable( this, getName() ); }
26         
27     public boolean isVariable()
28         { return true; }
29         
30     public String JavaDoc toString()
31         { return "?" + ((VariableName) label).name; }
32     
33     public boolean equals( Object JavaDoc other )
34         { return other instanceof Node_Variable && label.equals( ((Node_Variable) other).label ); }
35     
36     public static Object JavaDoc variable( String JavaDoc name )
37         { return new VariableName( name ); }
38     
39     public static class VariableName
40         {
41         String JavaDoc name;
42         
43         VariableName( String JavaDoc name )
44             { this.name = name; }
45         
46         public int hashCode()
47             { return name.hashCode(); }
48         
49         public boolean equals( Object JavaDoc other )
50             { return other instanceof VariableName && name.equals( ((VariableName) other).name ); }
51         
52         public String JavaDoc toString()
53             { return "?" + name; }
54         }
55     }
56
57 /*
58     (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
59     All rights reserved.
60
61     Redistribution and use in source and binary forms, with or without
62     modification, are permitted provided that the following conditions
63     are met:
64
65     1. Redistributions of source code must retain the above copyright
66        notice, this list of conditions and the following disclaimer.
67
68     2. Redistributions in binary form must reproduce the above copyright
69        notice, this list of conditions and the following disclaimer in the
70        documentation and/or other materials provided with the distribution.
71
72     3. The name of the author may not be used to endorse or promote products
73        derived from this software without specific prior written permission.
74
75     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
76     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
77     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
78     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
79     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
80     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
81     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
82     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
83     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
84     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
85 */
86
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