because if database or ur program are composing this string than they can give the value also .. but if its stored as a string in a column .. then only u need expression evaluator
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Question
Evaluating an expression
Problem is of converting a string into expression.
From database we find a string like : "((A>B) AND (B>C))"
When we put the value in it the string will become like "((15>10) AND (10>8))"
Now this string has to be used in a way so that it return me true ( for the above mentioned scenario)....
How can i handle this in Java
Thankz
Sanjay
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Answers
If you donnot want to make your own expression evaluator .
You can download BeanShell core from http://www.beanshell.org/ ,
and embed BeanShell interpreter in your application as an expression evaluator like:
bsh.Interpreter i = new bsh.Interpreter();
Object result=i.eval("((15>10) && (10>8))");
System.out.println("result
You can find more information here http://www.beanshell.org/m
Try http://jep.sourceforge.net
Maybe it is a little bit oversized for your problem. But I guess that you posted a simple example and that the expressions in your DB are much more complex.
JEP supports binding your variables to values very nicely.
See the code in the demo section to evaluate if it suits your needs
ssaluja:
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by: akshayxxPosted on 2002-10-29 at 19:20:20ID: 7385953
hmm u need some expression evaluator ..
where r u getting values from .. separate table in database ??
and this expression ..is it stored as a string in databse column .. or what .. i mean whats the way that u r getting this string composed from ..