Evaluate basic arithmatic in a string
From: David Morris (dmorris_at_dynamicquest.com)
Date: 04/02/04
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Date: Fri, 02 Apr 2004 09:31:30 -0500
OK, this is for you experienced Java programmers out there.
I have a string that contains the following value:
"myValue += 5"
I need, in Java, to be able to evaluate this expression.
Caviots:
myValue can be int, float, long, double, or short.
Likewise, the 5 could also be a variable of any of the above listed
types. ie, "myValue += myValue2".
Just so you know the environment, I an writing a java scripting janguage
where I can have a user build a template on the fly and I interpret all
the java code manually. I am about 75% finished mimicing the JVM in the
scripting but am lacking basic math functions.
I use a class
class ObjDef {
Object value;
Class className;
}
to store and pass values throughout the script interpretation process.
so I know the value and class of myValue and myValue2 and I know to cast
5 to an int if not otherwise set.
The real caviot comes in that if myValue is an int, the className in
ObjDef is int but the Object is Integer.
How do I get myValue ( which is really ObjDef.value ) to an int so I can
do an actully myValue = myValue + 5 and put it back in the ObjDef class?
Realize if I do a hard cast, 25 different possible combinations (5^2),
so I am looking for a different answer.
Thank you for any help you can offer.
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