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Salesforce Convert 15-char to 18-char IDs in Apex

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Credits to apex-lang package

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  1. global static String to18(String the15charID){
  2.         //a0BA0000000L2ZC  => a0BA0000000L2ZCMA0
  3.         //the15charID = 'a0BA0000000L2ZC'
  4.         final String BASE ='ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456';
  5.  
  6.         the15charID = StringUtils.trim(the15charID);
  7.         if(StringUtils.length(the15charID) != 15){
  8.             return the15charID;
  9.         }
  10.         String result = '';
  11.         List<String> chars = null;
  12.         for(integer i = 0; i < 3; i++){
  13.             chars = StringUtils.toCharArray(StringUtils.reverse(the15charID.substring(i*5,i*5+5)));
  14.             String binary = '';
  15.             for(String ch : chars){
  16.                 binary += Character.isUpperCase(ch) ? '1' : '0';
  17.             }
  18.             result += StringUtils.charAt(BASE,NumberUtils.parseInt(binary,2));
  19.         }
  20.         return the15charID + result;
  21.     }

URL: http://apex-lang.googlecode.com/svn/trunk/eclipse-project/src/classes/SystemUtils.cls

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