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| import java.*;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.jena.datatypes.xsd.XSDDatatype;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.RDFNode;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.Statement;
import org.apache.jena.rdf.model.StmtIterator;
import org.apache.jena.sparql.expr.NodeValue;
import org.apache.jena.sparql.function.Function;
import org.apache.jena.sparql.function.FunctionBase2;
import org.apache.jena.sparql.function.FunctionFactory;
public class haschild extends FunctionBase2 implements FunctionFactory{
private Map _cache;
public haschild()
{
_cache = new HashMap();
}
@Override
public NodeValue exec(NodeValue v1, NodeValue v2) {
String value = v2.asString();
Model model = ModelFactory.createDefaultModel();
InputStream is = null;
try {
is = new BufferedInputStream(
new FileInputStream( "C:\\fichier rdf/journal.webscience.org-vivo.rdf"));
} catch (FileNotFoundException ex) {
Logger.getLogger(haschild.class.getName()).log(Level.SEVERE, null, ex);
}
model.read(new InputStreamReader(is), "");
StmtIterator it=model.listStatements();
while (it.hasNext()) {
Statement p=it.next();
Property prop = p.getPredicate();
Resource res2 = p.getSubject();
RDFNode node =p.getObject();
System.out.println(res2.toString());
System.out.println(" " + prop.toString() + " ");
System.out.println(" " + node.toString() + " ");
if((v1.toString().equals(res2.toString()))&&(node.toString().equals(value))&&(prop.toString().equals("http://www.w3.org/2000/01/rdf-schema#HasChild")))
/*return (NodeValue) _cache.put(v1,true);*/
return NodeValue.TRUE;
return NodeValue.FALSE;
}
return null;
}
@Override
public Function create(String uri) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
} |
