/* @see com.hp.hpl.jena.sparql.syntax.ElementVisitorBase#visit(com.hp.hpl.jena.sparql.syntax.ElementFilter) */
@Override
public void visit(final ElementFilter elementfilter) {
final Expr expr = elementfilter.getExpr();
final BuiltinAtom atom;
try {
if (expr instanceof Expression) // RDQL
{
final Expression e = (Expression) expr;
final SWRLDataObject arg1 = makeDataObject(e.getArg(0));
final SWRLDataObject arg2 = makeDataObject(e.getArg(1));
if (e instanceof Q_Equal) atom = swrlFactory.createEqual(arg1, arg2);
else if (e instanceof Q_NotEqual) atom = swrlFactory.createNotEqual(arg1, arg2);
else if (e instanceof Q_GreaterThan) atom = swrlFactory.createGreaterThan(arg1, arg2);
else if (e instanceof Q_GreaterThanOrEqual)
atom = swrlFactory.createGreaterThanOrEqual(arg1, arg2);
else if (e instanceof Q_LessThan) atom = swrlFactory.createLessThan(arg1, arg2);
else if (e instanceof Q_LessThanOrEqual)
atom = swrlFactory.createLessThanOrEqual(arg1, arg2);
else
throw new IllegalArgumentException(
"Unsupported constraint expression " + e + " used in RDQL query.");
} else if (expr.isFunction()) // SPARQL
{
final ExprFunction f = (ExprFunction) expr;
final SWRLDataObject arg1 = makeDataObject(f.getArg(0));
final SWRLDataObject arg2 = makeDataObject(f.getArg(1));
if (f instanceof E_Equals) atom = swrlFactory.createEqual(arg1, arg2);
else if (f instanceof E_NotEquals) atom = swrlFactory.createNotEqual(arg1, arg2);
else if (f instanceof E_GreaterThan) atom = swrlFactory.createGreaterThan(arg1, arg2);
else if (f instanceof E_GreaterThanOrEqual)
atom = swrlFactory.createGreaterThanOrEqual(arg1, arg2);
else if (f instanceof E_LessThan) atom = swrlFactory.createLessThan(arg1, arg2);
else if (f instanceof E_LessThanOrEqual)
atom = swrlFactory.createLessThanOrEqual(arg1, arg2);
else
throw new IllegalArgumentException(
"Unsupported constraint (filter) " + f + " used in SPARQL query.");
} else return;
atoms = atoms.cons(atom);
} catch (final URISyntaxException e) {
throw new IllegalArgumentException(e.getInput() + " is not a valid URI!");
}
}
private SWRLDataObject makeDataObject(final Expression expr) throws URISyntaxException {
if (expr.isVariable()) {
return swrlFactory.createDataVariable(new URI(varNS + expr.getName()));
} else if (expr.isConstant()) {
OWLDataValue value = null;
if (expr instanceof ParsedLiteral) {
final ParsedLiteral lit = (ParsedLiteral) expr;
if (lit.isInt()) value = owlModel.createDataValue(Long.valueOf(lit.getInt()));
else if (lit.isDouble())
value = owlModel.createDataValue(Double.valueOf(lit.getDouble()));
else if (lit.isBoolean())
value = owlModel.createDataValue(Boolean.valueOf(lit.getBoolean()));
else if (lit.isString()) value = owlModel.createDataValue(lit.getString());
else if (lit.isURI()) value = owlModel.createDataValue(URI.create(lit.getURI()));
else /* if (lit.isNode()) */ throw new NotImplementedException();
} else value = owlModel.createDataValue(expr.getValue());
return swrlFactory.wrapDataValue(value);
} else {
throw new IllegalArgumentException(
"Nested constraint expressions near " + expr + " can not be transformed to SWRL atom.");
}
}
