KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > hp > hpl > jena > reasoner > rulesys > builtins > Print


1 /******************************************************************
2  * File: Print.java
3  * Created by: Dave Reynolds
4  * Created on: 11-Apr-2003
5  *
6  * (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
7  * [See end of file]
8  * $Id: Print.java,v 1.7 2005/02/21 12:17:32 andy_seaborne Exp $
9  *****************************************************************/
10 package com.hp.hpl.jena.reasoner.rulesys.builtins;
11
12 import com.hp.hpl.jena.reasoner.rulesys.*;
13 import com.hp.hpl.jena.util.PrintUtil;
14 import com.hp.hpl.jena.graph.*;
15
16 /**
17  * Print its argument list as a side effect
18  *
19  * @author <a HREF="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
20  * @version $Revision: 1.7 $ on $Date: 2005/02/21 12:17:32 $
21  */
22 public class Print extends BaseBuiltin {
23
24     /**
25      * Return a name for this builtin, normally this will be the name of the
26      * functor that will be used to invoke it.
27      */
28     public String JavaDoc getName() {
29         return "print";
30     }
31
32     /**
33      * This method is invoked when the builtin is called in a rule body.
34      * @param args the array of argument values for the builtin, this is an array
35      * of Nodes, some of which may be Node_RuleVariables.
36      * @param length the length of the argument list, may be less than the length of the args array
37      * for some rule engines
38      * @param context an execution context giving access to other relevant data
39      * @return return true if the buildin predicate is deemed to have succeeded in
40      * the current environment
41      */
42     public boolean bodyCall(Node[] args, int length, RuleContext context) {
43         print(args, length, context);
44         return true;
45     }
46     
47     
48     /**
49      * This method is invoked when the builtin is called in a rule head.
50      * Such a use is only valid in a forward rule.
51      * @param args the array of argument values for the builtin, this is an array
52      * of Nodes.
53      * @param context an execution context giving access to other relevant data
54      */
55     public void headAction(Node[] args, int length, RuleContext context) {
56         print(args, length, context);
57     }
58     
59     /**
60      * Print a node list to stdout
61      */
62     public void print(Node[] args, int length, RuleContext context) {
63         for (int i = 0 ; i < length; i++) {
64             System.out.print( PrintUtil.print(getArg(i, args, context)) + " ");
65         }
66         System.out.println("");
67     }
68 }
69
70 /*
71     (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
72     All rights reserved.
73
74     Redistribution and use in source and binary forms, with or without
75     modification, are permitted provided that the following conditions
76     are met:
77
78     1. Redistributions of source code must retain the above copyright
79        notice, this list of conditions and the following disclaimer.
80
81     2. Redistributions in binary form must reproduce the above copyright
82        notice, this list of conditions and the following disclaimer in the
83        documentation and/or other materials provided with the distribution.
84
85     3. The name of the author may not be used to endorse or promote products
86        derived from this software without specific prior written permission.
87
88     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
89     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
90     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
91     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
92     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
93     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
94     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
95     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
96     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
97     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
98 */
Popular Tags