ExpressionVisitor (container-search 7.514.59 API)

```
public interface ExpressionVisitor
```
This interface defines the necessary callback to recursively visit all GroupingExpression objects in a GroupingOperation. It is used by the GroupingValidator to ensure that all referenced attributes are valid for the cluster being queried.

Author:

Simon Thoresen Hult

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`visitExpression(GroupingExpression exp)`	This method is called for every `GroupingExpression` object in the targeted `GroupingOperation`.

- Method Detail
  - visitExpression
```
void visitExpression(GroupingExpression exp)
```
    This method is called for every GroupingExpression object in the targeted GroupingOperation.
    
    Parameters:
    
    exp - the expression being visited.