Java library for parsing & building logical expressions

Question

I am looking for an open source library in Java for parsing and building sql like expressions.

for example to evaluate validity of expressions like:

 "(a = x or y ) and (b != z)"

in addition I want to have an API for building or extending expressions. something like:

Expression exp = new Expression();
exp.addCondition("a",{"x","y"},Operator.OR);

It's not very complicated to implement such library, but aren't we develop in Java to enjoy collaborative development?

Thanks

Answer 1

I'm pretty sure you can have ANTLR do this for you.

The grammatic looks very simple ( from here ) :P

Answer 2

1. Use script engine.. antlr is not pragmatic unless you have some basic parser knowledge.