code: public boolean isOrderExpression(GroovyExpression expr) {
          if (expr instanceof FunctionCallExpression) {
              FunctionCallExpression functionCallExpression = (FunctionCallExpression) expr;
              if (functionCallExpression.getFunctionName().equals(ORDER_METHOD)) {
                  return true;
              }
          }
          return false;
      }
docs: Determines if specified expression is an order method call
  
  @param expr
  @return