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Equation processing for Java

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package com.codetaco.algebrain.function;

import java.text.ParseException;

import com.codetaco.algebrain.Function;
import com.codetaco.algebrain.ValueStack;
import com.codetaco.algebrain.token.TokVariable;

/**
 * 
 * FuncLog class.
 * 
 *
 * @author Chris DeGreef [email protected]
 * @since 1.3.9
 */
public class FuncLog extends Function
{
    /**
     * 
     * Constructor for FuncLog.
     * 
     */
    public FuncLog()
    {
        super();
    }

    /**
     * 
     * Constructor for FuncLog.
     * 
     *
     * @param var a {@link com.codetaco.algebrain.token.TokVariable} object.
     */
    public FuncLog(final TokVariable var)
    {
        super(var);
    }

    /** {@inheritDoc} */
    @Override
    public void resolve(final ValueStack values) throws Exception
    {
        if (values.size() < 1)
            throw new Exception("missing operands for " + toString());
        try
        {
            values.push(new Double(Math.log(values.popDouble())));
        } catch (final ParseException e)
        {
            e.fillInStackTrace();
            throw new Exception(toString() + "; " + e.getMessage(), e);
        }
    }

    /** {@inheritDoc} */
    @Override
    public String toString()
    {
        return "function(log)";
    }
}