The answer was a posting on the Jeks forum. I got an answer from Manu. I thought it was not active especially as I could not register on it - but that got sorted.
But if anyone has the same problem then the following lines of code will get it working:
ExpressionParser parser; // we did have = new ExpressionParser(new JeksExpressionSyntax(), null);
JeksInterpreter interpreter; //
And to create the interpreter:
interpreter = new JeksInterpreter() {
@Override
public Object getBinaryOperatorValue (Object binaryOperatorKey, Object param1, Object param2)
{
// Only functions may take a cell set as parameter
if ( param1 instanceof JeksCellSet || param2 instanceof JeksCellSet)
throw new IllegalArgumentException ();
// Enabled comparison between any type supported by Jeks
else if (binaryOperatorKey.equals (JeksExpressionSyntax.OPERATOR_EQUAL))
return param1 != null && param1.equals (param2)
? Boolean.TRUE : Boolean.FALSE;
// Enabled comparison between any type supported by Jeks
else if (binaryOperatorKey.equals (JeksExpressionSyntax.OPERATOR_DIFFERENT))
return param1 != null && param1.equals (param2) ? Boolean.FALSE : Boolean.TRUE;
else
return super.getBinaryOperatorValue (binaryOperatorKey, param1, param2);
}
};
parser = new ExpressionParser(new JeksExpressionSyntax(), null);