/**
* @return - A string of SPARQL statements that can be used in a SPARQL query to restrict the
* variable "?s"
* @throws UnsupportedSelectorTypeException
*/
public String getFilterString() throws UnsupportedSelectorTypeException {
String selectorSPARQLString;
Literal selector = pm.getSubjectFilter();
URI selectorType = getSelectorType(selector);
String selectorValue = selector.getValue();
String filterSubjectVarString = "?s";
LOGGER.info("Processing selector type " + selectorType);
if (selectorType.toString().equals("http://purl.org/rvl/fslSelector")) {
// RVLs basic "fsl selector"
String[] fslParts = selectorValue.split("::");
URI filterPredicate = new URIImpl(fslParts[0]).asURI();
URI filterObject = new URIImpl(fslParts[1]).asURI();
selectorSPARQLString =
filterSubjectVarString
+ " "
+ filterPredicate.toSPARQL()
+ " "
+ filterObject.toSPARQL()
+ " . "
+ " FILTER( ?s !="
+ filterObject.toSPARQL()
+ ") "; // HACK: we exclude reflexive occurences for now to avoid showing classes
// being the subclass of itself ...
} else if (selectorType.toString().equals("http://purl.org/rvl/sparqlSelector")) {
// RVLs basic "sparql selector"
selectorSPARQLString = selectorValue;
} else if (selectorType.toString().equals("http://purl.org/rvl/classSelector")) {
// default: class selector (a class name is expected)
// will be interpreted as a constraint on the type of resources
selectorSPARQLString =
filterSubjectVarString
+ " "
+ RDF.type.toSPARQL()
+ " "
+ new URIImpl(selectorValue).asResource().toSPARQL()
+ " . ";
} else {
throw new UnsupportedSelectorTypeException(
"The selector type " + selectorType + " is noty yet supported.");
}
LOGGER.info(
"Applying subject filter. Only resources matching "
+ selectorSPARQLString
+ " will be affected by the mapping "
+ "(and thus shown, which is not the default behavior --> TODO!)");
return selectorSPARQLString;
}
