code: public static String getCurrent(String oldPdbId) {
  		List<String> replacements =  getReplacement(oldPdbId,true, false);
  		if(replacements != null && !replacements.isEmpty())
  			return replacements.get(0);
  		else
  			return null;
  	}
docs: Gets the current version of a PDB ID. This is equivalent to selecting
  the first element from
  {@link #getReplacement(String,boolean,boolean)
  
  @param oldPdbId
  @return The replacement for oldPdbId, or null if none are found or if an error occurred.