com.codetaco.math.function.FuncMax Maven / Gradle / Ivy

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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;

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

    /**
     * 
     * Constructor for FuncMax.
     * 
     *
     * @param var a {@link com.codetaco.math.token.TokVariable} object.
     */
    public FuncMax(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 Object[] value = values.ensureSameTypes(getParameterCount());
            if (value[0] instanceof Long) {
                long bestSoFar = (Long) value[0];
                for (int x = 1; x < value.length; x++) {
                    bestSoFar = new Long(Math.max(bestSoFar, (Long) value[x]));
                }
                values.push(new Long(bestSoFar));
            } else if (value[0] instanceof Double) {
                double bestSoFar = (Double) value[0];
                for (int x = 1; x < value.length; x++) {
                    bestSoFar = new Double(Math.max(bestSoFar, (Double) value[x]));
                }
                values.push(new Double(bestSoFar));
            }
        } catch (final ParseException e) {
            e.fillInStackTrace();
            throw new Exception(toString() + "; " + e.getMessage(), e);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "function(max-" + getParameterCount() + ")";
    }
}