@Override
public void meet(MathExpr expr) throws RuntimeException {
ValueType ot = new OPTypeFinder(expr).coerce();
if (ot == ValueType.STRING) {
if (expr.getOperator() == MathExpr.MathOp.PLUS) {
builder.append(
functionRegistry
.get(FN.CONCAT.stringValue())
.getNative(
parent.getDialect(),
new ValueExpressionEvaluator(expr.getLeftArg(), parent, ot).build(),
new ValueExpressionEvaluator(expr.getRightArg(), parent, ot).build()));
} else {
throw new IllegalArgumentException(
"operation " + expr.getOperator() + " is not supported on strings");
}
} else {
if (ot == ValueType.NODE || ot == ValueType.TERM) {
ot = ValueType.DOUBLE;
}
optypes.push(ot);
expr.getLeftArg().visit(this);
builder.append(getSQLOperator(expr.getOperator()));
expr.getRightArg().visit(this);
optypes.pop();
}
}
@Override
public void meet(IRIFunction fun) throws RuntimeException {
if (fun.getBaseURI() != null) {
String ex = new ValueExpressionEvaluator(fun.getArg(), parent, ValueType.STRING).build();
builder
.append("CASE WHEN position(':' IN ")
.append(ex)
.append(") > 0 THEN ")
.append(ex)
.append(" ELSE ")
.append(
functionRegistry
.get(FN.CONCAT.stringValue())
.getNative(parent.getDialect(), "'" + fun.getBaseURI() + "'", ex))
.append(" END ");
} else {
// get value of argument and express it as string
optypes.push(ValueType.STRING);
fun.getArg().visit(this);
optypes.pop();
}
}
