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Equation processing for Java

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package com.codetaco.math.function;

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

import java.text.ParseException;

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

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

    /**
     * {@inheritDoc}
     */
    @Override
    public void resolve(final ValueStack values) throws Exception {
        if (values.size() < getParameterCount()) {
            throw new Exception("missing operands for " + toString());
        }
        try {
            final String target = values.popString();

            values.push(target.trim());
        } catch (final ParseException e) {
            e.fillInStackTrace();
            throw new Exception(toString() + "; " + e.getMessage(), e);
        }
    }

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