source: xssim/src/simulator/utils/DoubleMath.java @ 104

/**
 * Created on 2008-01-05
 */
package simulator.utils;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.Locale;

/**
 * This class provides basic mathematical operations for the <code>double</code> primitive type
 * @author Stanislaw Szczepanowski
 */
public class DoubleMath {
        
        /**
         * The pattern used for converting a <code>double</code> value to a string
         */
        public static String PATTERN = "###.###";
        
        /**
         * A protected constructor which will be invoked only 
         * one time in the lifetime of this class
         */
        protected DoubleMath() {
        }
        
        /**
         * Adds two <code>double</code> values and returns the result of addition
         * @param left the left argument
         * @param right the right argument
         * @return the result of addition of the two arguments
         */
        public static double add(double left, double right) {
                DecimalFormat df = (DecimalFormat) DecimalFormat.getInstance(Locale.ENGLISH);
                df.applyPattern(PATTERN);
                String leftStr = df.format(left);
                String rightStr = df.format(right);
                BigDecimal resultDec = new BigDecimal(leftStr);
                BigDecimal rightDec = new BigDecimal(rightStr);
                resultDec = resultDec.add(rightDec);
                return resultDec.doubleValue();
        }
        
        /**
         * Subtracts from the <code>left</code> argument the <code>right</code> argument and returns the result of subtraction
         * @param left the left argument
         * @param right the right argument
         * @return the result of subtraction of the two arguments
         */
        public static double subtract(double left, double right) {
                DecimalFormat df = (DecimalFormat) DecimalFormat.getInstance(Locale.ENGLISH);
                df.applyPattern(PATTERN);
                String leftStr = df.format(left);
                String rightStr = df.format(right);
                BigDecimal resultDec = new BigDecimal(leftStr);
                BigDecimal rightDec = new BigDecimal(rightStr);
                resultDec = resultDec.subtract(rightDec);
                return resultDec.doubleValue();
        }

}