/*
* (c) Copyright Hewlett-Packard Company 2001 - 2009
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.hp.gloze.extension;
import com.hp.hpl.jena.datatypes.RDFDatatype;
import com.hp.hpl.jena.datatypes.TypeMapper;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.reasoner.InfGraph;
import com.hp.hpl.jena.reasoner.rulesys.BindingEnvironment;
import com.hp.hpl.jena.reasoner.rulesys.RuleContext;
import com.hp.hpl.jena.reasoner.rulesys.builtins.BaseBuiltin;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;
import com.hp.hpl.jena.vocabulary.XSD;
/**
* @author steven.a.battle@googlemail.com
*/
public class CountValues extends BaseBuiltin {
public String getName() {
return "countValues";
}
public int getArgLength() {
return 3;
}
public String getURI() {
return "http://www.hp.com/gloze/extension/countValues";
}
public boolean bodyCall(Node[] args, int length, RuleContext context) {
BindingEnvironment env = context.getEnv();
InfGraph graph = context.getGraph();
Node s = env.getGroundVersion(args[0]);
Node p = env.getGroundVersion(args[1]);
ExtendedIterator i = graph.find(s,p,null);
int n = i.toSet().size();
TypeMapper tm = TypeMapper.getInstance();
RDFDatatype type = tm.getTypeByName(XSD.xint.getURI());
Node count = Node.createLiteral(Integer.toString(n),null,type);
env.bind(args[2],count);
return true;
}
}