/**

  * The contents of this file are subject to the Mozilla Public License Version 1.1

  * (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 Original Code is "DataTypeUtil.java".  Description:

  * "This class is used to provide utility functions for other datatype classes and methods."

  *

  * The Initial Developer of the Original Code is University Health Network. Copyright (C)

  * 2001.  All Rights Reserved.

  *

  * Contributor(s): ______________________________________.

  *

  * Alternatively, the contents of this file may be used under the terms of the

  * GNU General Public License (the "GPL"), in which case the provisions of the GPL are

  * applicable instead of those above.  If you wish to allow use of your version of this

  * file only under the terms of the GPL and not to allow others to use your version

  * of this file under the MPL, indicate your decision by deleting  the provisions above

  * and replace  them with the notice and other provisions required by the GPL License.

  * If you do not delete the provisions above, a recipient may use your version of

  * this file under either the MPL or the GPL.

  *

  */

 package ca.uhn.hl7v2.model;

 import java.util.*;

 /**

  * This class is used to provide utility functions for other datatype classes and methods.

  */

 public class DataTypeUtil {

     public DataTypeUtil() {

     }

     /**

      * Preappend the zeros to the beginning of num such that the total length

      * equals totalDigitLength and return the string representation of the new number

      *

      * @param num              number

      * @param totalDigitLength number of digits

      * @return string representation of the new number

      */

     public static String preAppendZeroes(int num, int totalDigitLength) {

         return (totalDigitLength == 0) ?

                 Integer.toString(num) :

                 String.format(String.format("%%0%dd", totalDigitLength), num);

     }

     /**

      * Return a signed four digit integer indicating the local

      * GMT offset. This is the HL7 Offset format in integer representation.

      *

      * @return a signed four digit integer indicating the local GMT offset

      */

     public static int getLocalGMTOffset() {

         GregorianCalendar currentTime = new GregorianCalendar();

         int gmtOffSet = currentTime.get(GregorianCalendar.ZONE_OFFSET);

         int offSetSignInt = gmtOffSet < 0 ? -1 : 1;

         //get the absolute value of the gmtOffSet

         int absGmtOffSet = Math.abs(gmtOffSet);

         int gmtOffSetHours = absGmtOffSet / (3600 * 1000);

         int gmtOffSetMin = (absGmtOffSet / 60000) % (60);

         // return the offset value HL7 format

         return ((gmtOffSetHours * 100) + gmtOffSetMin) * offSetSignInt;

     }

 }