OpenEHRNumberFormat.java

package se.cambio.openehr.util;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;

public class OpenEHRNumberFormat  {


    public static char DV_QUANTITY_DECIMAL_SEPARATOR = '.';

    public static DecimalFormat getDecimalFormat(){
        return getDecimalFormat(null);
    }

    public static DecimalFormat getDecimalFormat(Integer precision){
        DecimalFormatSymbols custom = new DecimalFormatSymbols();
        custom.setDecimalSeparator(DV_QUANTITY_DECIMAL_SEPARATOR);
        DecimalFormat format = new DecimalFormat();
        format.setDecimalFormatSymbols(custom);
        format.setGroupingUsed(false);
        if (precision!=null){
            format.setMinimumFractionDigits(precision);
            format.setMaximumFractionDigits(precision);
        }
        return format;
    }


    public static String toStringUsingPrecision(double unrounded, int precision){
        String origStr = new BigDecimal(unrounded).toString();
        StringBuffer roundSB = new StringBuffer();
        roundSB.append(origStr);
        if (origStr.contains(".")){
            int numDecimals = origStr.length()-origStr.indexOf(".")-1;
            if (numDecimals!=precision){
                if (numDecimals>precision){
                    if (precision>0){
                        roundSB = new StringBuffer(origStr.substring(0, origStr.indexOf(".")+precision+1));
                    }else{
                        roundSB = new StringBuffer(origStr.substring(0, origStr.indexOf(".")));
                    }
                }else {
                    appendZeros(roundSB, precision-numDecimals);
                }
            }
        }else{
            if (precision>0){
                roundSB.append(".");
                appendZeros(roundSB, precision);
            }
        }
        return roundSB.toString();
    }

    private static void appendZeros(StringBuffer roundSB, int precision){
        for (int i =0; i<precision;i++) {
            roundSB.append("0");
        }
    }
}
/*
 *  ***** BEGIN LICENSE BLOCK *****
 *  Version: MPL 2.0/GPL 2.0/LGPL 2.1
 *
 *  The contents of this file are subject to the Mozilla Public License Version
 *  2.0 (the 'License'); you may not use this file except in compliance with
 *  the License. You may obtain a copy of the License at
 *  http://www.mozilla.org/MPL/
 *
 *  Software distributed under the License is distributed on an 'AS IS' basis,
 *  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 *  for the specific language governing rights and limitations under the
 *  License.
 *
 *
 *  The Initial Developers of the Original Code are Iago Corbal and Rong Chen.
 *  Portions created by the Initial Developer are Copyright (C) 2012-2013
 *  the Initial Developer. All Rights Reserved.
 *
 *  Contributor(s):
 *
 * Software distributed under the License is distributed on an 'AS IS' basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 *  ***** END LICENSE BLOCK *****
 */