public static NodeValue strLang(NodeValue v1, NodeValue v2) {
if (!v1.isString()) throw new ExprEvalException("Not a string (arg 1): " + v1);
if (!v2.isString()) throw new ExprEvalException("Not a string (arg 2): " + v2);
String lex = v1.asString();
String lang = v2.asString();
// Check?
Node n = Node.createLiteral(lex, lang, null);
return NodeValue.makeNode(n);
}
public static NodeValue strDatatype(NodeValue v1, NodeValue v2) {
if (!v1.isString()) throw new ExprEvalException("Not a string (arg 1): " + v1);
if (!v2.isIRI()) throw new ExprEvalException("Not an IRI (arg 2): " + v2);
String lex = v1.asString();
Node dt = v2.asNode();
// Check?
Node n = Node.createLiteral(lex, null, Node.getType(dt.getURI()));
return NodeValue.makeNode(n);
}
public void visit(NodeValue value) {
logger.debug("visit NodeValue " + value);
if (!convertable) {
expression.push(Expression.FALSE); // prevent stack empty exceptions when conversion
return; // fails in the middle of a multi-arg operator conversion
}
if (value.isDecimal()
|| value.isDouble()
|| value.isFloat()
|| value.isInteger()
|| value.isNumber()) {
expression.push(new ConstantEx(value.asString(), value.asNode()));
} else if (value.isDateTime()) {
// Convert xsd:dateTime: CCYY-MM-DDThh:mm:ss
// to SQL-92 TIMESTAMP: CCYY-MM-DD hh:mm:ss[.fraction]
// TODO support time zones (WITH TIME ZONE columns)
expression.push(new ConstantEx(value.asString().replace("T", " "), value.asNode()));
} else {
expression.push(new ConstantEx(value.asString(), value.asNode()));
}
}