/*
* See http://www.w3.org/TR/rdf-sparql-query paragraph 11.4.4
*
* "(STR) Returns the lexical form of a literal; returns the codepoint representation of an IRI."
*
* @see http://www.w3.org/TR/rdf-sparql-query
*/
private void convertStr(E_Str expr) {
logger.debug("convertStr " + expr.toString());
expr.getArg().visit(this);
Expression arg = expression.pop();
if (arg instanceof AttributeExprEx) {
// make a new AttributeExprEx with changed NodeMaker, which returns plain literal
// TODO this seems to work, but needs more testing.
AttributeExprEx attribute = (AttributeExprEx) arg;
TypedNodeMaker nodeMaker = (TypedNodeMaker) attribute.getNodeMaker();
TypedNodeMaker newNodeMaker =
new TypedNodeMaker(
TypedNodeMaker.PLAIN_LITERAL, nodeMaker.valueMaker(), nodeMaker.isUnique());
logger.debug("changing nodemaker " + nodeMaker + " to " + newNodeMaker);
expression.push(
new AttributeExprEx((Attribute) attribute.attributes().iterator().next(), newNodeMaker));
} else if (arg instanceof ConstantEx) {
ConstantEx constant = (ConstantEx) arg;
Node node = constant.getNode();
String lexicalForm = node.getLiteral().getLexicalForm();
node = Node.createLiteral(lexicalForm);
ConstantEx constantEx = new ConstantEx(NodeValue.makeNode(node).asString(), node);
logger.debug("pushing " + constantEx);
expression.push(constantEx);
} else {
conversionFailed(expr);
}
}
