01: /*
02: * (c) Copyright 2007, 2008 Hewlett-Packard Development Company, LP
03: * All rights reserved.
04: * [See end of file]
05: */
06:
07: package arq.examples.filter;
08:
09: import com.hp.hpl.jena.sparql.expr.NodeValue;
10: import com.hp.hpl.jena.sparql.function.FunctionBase1;
11:
12: /** Example filter function that returns an indicative type string.
13: * <ul>
14: * <li>"Number", if it's a number of some kind</li>
15: * <li>"String", if it's string</li>
16: * <li>"DateTime", if it's a date time</li>
17: * <li>"unknown" otherwise</li>
18: * </ul>
19: *
20: * Usage:
21: * <pre>
22: * PREFIX ext: <java:arq.examples.ext.>
23: * </pre>
24: * <pre>
25: * FILTER ext:classify(3+?x)
26: * <pre>
27: * @author Andy Seaborne
28: */
29:
30: public class classify extends FunctionBase1 {
31: public classify() {
32: super ();
33: }
34:
35: //@Override
36: public NodeValue exec(NodeValue v) {
37: if (v.isNumber())
38: return NodeValue.makeString("number");
39: if (v.isDateTime())
40: return NodeValue.makeString("dateTime");
41: if (v.isString())
42: return NodeValue.makeString("string");
43:
44: return NodeValue.makeString("unknown");
45: }
46: }
47:
48: /*
49: * (c) Copyright 2007, 2008 Hewlett-Packard Development Company, LP
50: * All rights reserved.
51: *
52: * Redistribution and use in source and binary forms, with or without
53: * modification, are permitted provided that the following conditions
54: * are met:
55: * 1. Redistributions of source code must retain the above copyright
56: * notice, this list of conditions and the following disclaimer.
57: * 2. Redistributions in binary form must reproduce the above copyright
58: * notice, this list of conditions and the following disclaimer in the
59: * documentation and/or other materials provided with the distribution.
60: * 3. The name of the author may not be used to endorse or promote products
61: * derived from this software without specific prior written permission.
62: *
63: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
64: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
65: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
66: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
67: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
68: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
69: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
70: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
71: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
72: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
73: */
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