ExpressionVisitor (OpenJPA Parent POM 4.1.1 API)

All Known Implementing Classes:

AbstractExpressionVisitor
```
public interface ExpressionVisitor
```
Visits nodes of a query expression tree.

Author:

Abe White

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`enter(Expression exp)`	Enter an expression.
`void`	`enter(Value val)`	Enter a value.
`void`	`exit(Expression exp)`	Leave an expression.
`void`	`exit(Value val)`	Leave a value.

- Method Detail
  - enter
```
void enter(Expression exp)
```
    Enter an expression. The expression will then invoke visits on its components.
  - exit
```
void exit(Expression exp)
```
    Leave an expression.
  - enter
```
void enter(Value val)
```
    Enter a value. The value will then invoke visits on its components.
  - exit
```
void exit(Value val)
```
    Leave a value.