Question

I need to turn a string such as

class freud IF : 0.010<=cst0.1<=0.02 ^ 0.012<=cst0.2<=0.014 ^ 0.01<=cst0.3<=0.011 ^ 0.009<=cst0.4<=0.01 ^ cst0.5=0.009 ^ 0.008<=cst0.6<=0.009 ^ 0.008<=cst0.7<=0.009 ^ 0.007<=cst0.8<=0.009 ^ 0.007<=cst0.9<=0.009 ^ 0.008<=cst1.0<=0.012

into an actual Java if statement: i.e.

if(0.010 <= cst0.1 && cst0.1 <= 0.02 .....)

where cst0.1 becomes the name of a float etc.

Any ideas? I have tried splitting the string into its components, but all the strings I need vary!

Thanks

Answer 1

you can try create evaluate method boolean evaluate(String stringToEvaluate)
wich will split your string on segments and evaluate each bit

public class MyClass {
    public boolean evaluate(String stringToEvaluate)
    {
    boolean exprvalue = true;
    for (String string : stringToEvaluate.split("^"))
            {
            exprvalue = exprvalue && evaluateLE(string);
            }
    return exprvalue;
    }

    private boolean evaluateLE(String string) {
        String[] values = string.split("<=");
        if (values.length==2)
        {
            return evaluateVal(values[0]) <= evaluateVal(values[1]); 
        }

        return evaluateOtherLogicalExpr(string);
    }

    private float evaluateVal(String string) {
        if (isExpresion(string)) return evaluateArthmeticalExpr(string);
        if (isVariable(string)) return evaluateVariable(string);

        return Float.parseFloat(string);
    }
}