/** returns the literal value of the node reachable from subject via predicate */
public static String getObjectLiteral(Model r, Resource subject, Resource predicate)
throws ModelException {
RDFNode obj = getObject(r, subject, predicate);
if (obj instanceof Literal) return obj.toString();
else return null;
}
/**
* This method is used to compute the hash code of RDF statements. All implementation of
* org.w3c.rdf.model.Statement MUST use this method. The hash code is computed as
*
* <blockquote>
*
* <pre>
* ((s.hashCode() * 7) + p.hashCode()) * 7 + o.hashCode()
* </pre>
*
* </blockquote>
*/
public static int statementHashCode(Resource s, Resource p, RDFNode o) {
return ((s.hashCode() * 7) + p.hashCode()) * 7 + o.hashCode();
}