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## org.apache.openjpa.kernel.exps
Interface ExpressionVisitor

All Known Implementing Classes:
  AbstractExpressionVisitor, HasContainsExpressionVisitor

    public interface ExpressionVisitor

Visits nodes of a query expression tree.

Author:
  Abe White

Method Summary
`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.

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