code: public ColumnModel getColumn(String colOrFieldName) {
  		for (ColumnModel columnModel : columns) {
  			if (columnModel.getColumnName() != null && columnModel.getColumnName().equalsIgnoreCase(colOrFieldName))
  				return columnModel;
  			if (columnModel.getEntityField() != null && columnModel.getEntityField().equalsIgnoreCase(colOrFieldName))
  				return columnModel;
  		}
  		return null;
  	}
docs: Get ColumnModel by column Name or field name ignore case, if not found,
  return null