code: public String[] buildWhereArgs(Collection<Object> values) {
  		List<String> selectionArgs = new ArrayList<String>();
  		for (Object value : values) {
  			if (value != null) {
  				selectionArgs.add(value.toString());
  			}
  		}
  		return selectionArgs.isEmpty() ? null : selectionArgs
  				.toArray(new String[] {});
  	}
docs: Build where (or selection) args for the values
  
  @param values
  values
  @return where args