package net.fortytwo.ripple.libs.graph;
import net.fortytwo.flow.Sink;
import net.fortytwo.ripple.RippleException;
import net.fortytwo.ripple.model.Model;
import net.fortytwo.ripple.model.ModelConnection;
import net.fortytwo.ripple.model.PrimitiveStackMapping;
import net.fortytwo.ripple.model.RDFValue;
import net.fortytwo.ripple.model.RippleList;
import net.fortytwo.ripple.model.RippleValue;
import net.fortytwo.ripple.model.impl.sesame.SesameModel;
import org.openrdf.model.Resource;
import org.openrdf.model.Statement;
import java.util.logging.Logger;
/**
* A primitive which consumes a resource and produces a three-element list
* (subject, resource, object) for each statement about the resource.
*
* @author Joshua Shinavier (http://fortytwo.net)
*/
public class Inlinks extends PrimitiveStackMapping {
private static final String[] IDENTIFIERS = {
GraphLibrary.NS_2013_03 + "inlinks",
GraphLibrary.NS_2008_08 + "inlinks"};
private static final Logger logger = Logger.getLogger(Inlinks.class.getName());
public String[] getIdentifiers() {
return IDENTIFIERS;
}
public Inlinks()
throws RippleException {
super();
}
public Parameter[] getParameters() {
return new Parameter[]{
new Parameter("o", null, true)};
}
public String getComment() {
return "o => s p o g";
}
public void apply(final RippleList arg,
final Sink<RippleList> solutions,
final ModelConnection mc) throws RippleException {
Model model = mc.getModel();
if (model instanceof SesameModel) {
final RippleList stack = arg;
final RippleValue obj = stack.getFirst();
final RippleList rest = stack.getRest();
Sink<Statement> stSink = new Sink<Statement>() {
public void put(final Statement st) throws RippleException {
Resource context = st.getContext();
RippleValue subj = mc.canonicalValue(new RDFValue(st.getSubject()));
RippleValue pred = mc.canonicalValue(new RDFValue(st.getPredicate()));
RippleValue ctx = (null == context) ? mc.list() : mc.canonicalValue(new RDFValue(context));
solutions.put(rest.push(subj).push(pred).push(obj).push(ctx));
}
};
mc.getStatements(null, null, obj.toRDF(mc), stSink);
} else {
logger.warning("primitive is compatible only with the Sesame model: " + this);
}
}
}