IESDataFormatUtils.java

/*
 * Copyright 2011-16 Fraunhofer ISE
 *
 * This file is part of OpenMUC.
 * For more information visit http://www.openmuc.org
 *
 * OpenMUC is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * OpenMUC is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OpenMUC.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openmuc.framework.datalogger.ascii.utils;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;

import org.openmuc.framework.datalogger.ascii.exceptions.WrongScalingException;

public class IESDataFormatUtils {

    // private final static Logger logger = LoggerFactory.getLogger(IESDataFormatUtils.class);

    /**
     * Convert a double value into a string with the maximal allowed length of maxlength.
     * 
     * @param value
     *            the value to convert
     * @param maxLength
     *            The maximal allowed length with all signs.
     * @return a double as string with max length.
     * @throws WrongScalingException
     *             will thrown if converted value is bigger then maxLength
     */
    public static String convertDoubleToStringWithMaxLength(double value, int maxLength) throws WrongScalingException {

        String ret;

        String format;
        double valueWork = value;
        long lValue = (long) (valueWork * 10000.0);
        valueWork = lValue / 10000.0;

        if (lValue >= 0) {

            if (lValue >> 63 != 0) {
                valueWork *= -1l;
            }
            format = '+' + getFormat(valueWork);
        }
        else {
            format = getFormat(valueWork);
        }

        DecimalFormat df = new DecimalFormat(format, new DecimalFormatSymbols(Locale.ENGLISH));
        ret = df.format(valueWork);

        if (ret.length() > maxLength) {
            throw new WrongScalingException("Double value (" + value + ") too large for convertion into max length "
                    + maxLength + "! Try to scale value.");
        }
        return ret;
    }

    private static String getFormat(double value) {

        long lValue = (long) value;
        String format;

        if (lValue > 999999 || lValue < -999999) {
            format = "#######0";
        }
        else if (lValue > 99999 || lValue < -99999) {
            format = "#####0.0";
        }
        else if (lValue > 9999 || lValue < -9999) {
            format = "####0.00";
        }
        else {
            format = "###0.000";
        }

        return format;
    }
}