01: /******************************************************************
02: * File: UriConcat.java
03: * Created by: Dave Reynolds
04: * Created on: 10 Jan 2007
05: *
06: * (c) Copyright 2007, Hewlett-Packard Development Company, LP
07: * [See end of file]
08: * $Id: UriConcat.java,v 1.2 2008/01/02 12:06:21 andy_seaborne Exp $
09: *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.builtins;
10:
11: import com.hp.hpl.jena.graph.Node;
12: import com.hp.hpl.jena.reasoner.rulesys.BuiltinException;
13: import com.hp.hpl.jena.reasoner.rulesys.RuleContext;
14:
15: /**
16: * Builtin which concatenates a set of strings to generate a new URI.
17: * It binds the last argument to a URI whose spelling is
18: * the concatenation of the lexical form of all the preceeding arguments.
19: *
20: * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
21: * @version $Revision: 1.2 $
22: */
23: public class UriConcat extends StrConcat {
24:
25: /**
26: * Return a name for this builtin, normally this will be the name of the
27: * functor that will be used to invoke it.
28: */
29: public String getName() {
30: return "uriConcat";
31: }
32:
33: /**
34: * This method is invoked when the builtin is called in a rule body.
35: * @param args the array of argument values for the builtin, this is an array
36: * of Nodes, some of which may be Node_RuleVariables.
37: * @param length the length of the argument list, may be less than the length of the args array
38: * for some rule engines
39: * @param context an execution context giving access to other relevant data
40: * @return return true if the buildin predicate is deemed to have succeeded in
41: * the current environment
42: */
43: public boolean bodyCall(Node[] args, int length, RuleContext context) {
44: if (length < 1)
45: throw new BuiltinException(this , context,
46: "Must have at least 1 argument to " + getName());
47: StringBuffer buff = new StringBuffer();
48: for (int i = 0; i < length - 1; i++) {
49: buff.append(lex(getArg(i, args, context), context));
50: }
51: Node result = Node.createURI(buff.toString());
52: return context.getEnv().bind(args[length - 1], result);
53: }
54: }
55:
56: /*
57: (c) Copyright 2007, 2008 Hewlett-Packard Development Company, LP
58: All rights reserved.
59:
60: Redistribution and use in source and binary forms, with or without
61: modification, are permitted provided that the following conditions
62: are met:
63:
64: 1. Redistributions of source code must retain the above copyright
65: notice, this list of conditions and the following disclaimer.
66:
67: 2. Redistributions in binary form must reproduce the above copyright
68: notice, this list of conditions and the following disclaimer in the
69: documentation and/or other materials provided with the distribution.
70:
71: 3. The name of the author may not be used to endorse or promote products
72: derived from this software without specific prior written permission.
73:
74: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
75: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
76: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
77: IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
78: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
79: NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
80: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
81: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
82: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
83: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
84: */
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