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java symbolic computing library and mathematical editor

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package jscl.math.operator;

import jscl.math.Generic;
import jscl.math.JSCLInteger;
import jscl.math.NotIntegerException;
import jscl.math.Variable;

public class Sum extends Operator {
    public Sum(Generic expression, Generic variable, Generic n1, Generic n2) {
        super("sum",new Generic[] {expression,variable,n1,n2});
    }

    public Generic compute() {
        Variable variable=parameter[1].variableValue();
        try {
            int n1=parameter[2].integerValue().intValue();
            int n2=parameter[3].integerValue().intValue();
            Generic a=JSCLInteger.valueOf(0);
            for(int i=n1;i<=n2;i++) {
                a=a.add(parameter[0].substitute(variable,JSCLInteger.valueOf(i)));
            }
            return a;
        } catch (NotIntegerException e) {}
        return expressionValue();
    }

    public String toMathML() {
        Variable v=parameter[1].variableValue();
        StringBuffer b = new StringBuffer();
        b.append("");
        b.append(parameter[2].toMathML());
        b.append("");
        b.append(parameter[3].toMathML());
        b.append("");
        b.append(v.toMathML());
        b.append("");
        b.append(parameter[0].toMathML());
        b.append("");
        return b.toString();
     }

    protected Variable newinstance() {
        return new Sum(null,null,null,null);
    }
}