org.apache.olingo.odata2.api.uri.expression

## Interface Visitable

- All Known Subinterfaces:
    BinaryExpression, CommonExpression, FilterExpression, LiteralExpression, MemberExpression, MethodExpression, OrderByExpression, OrderExpression, PropertyExpression, UnaryExpression

      public interface Visitable

  The interface `Visitable` is part of the visitor pattern used to traverse the expression tree build from a $filter expression string or $orderby expression string. It is implemented by each class used as node in an expression tree.
  See Also:
    `ExpressionVisitor`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `accept(ExpressionVisitor visitor)` Method `accept(ExpressionVisitor)` is called when traversing the expression tree.

- - ### Method Detail

    - #### accept

          Object accept(ExpressionVisitor visitor)
                 throws ExceptionVisitExpression,
                        ODataApplicationException

      Method `accept(ExpressionVisitor)` is called when traversing the expression tree. This method is invoked on each expression used as node in an expression tree. The implementations should behave as follows:
    - Call accept on all sub nodes and store the returned Objects
    - Call the appropriate method on the `ExpressionVisitor` instance and provide the stored objects to that instance
    - Return the object which should be passed to the processing algorithm of the parent expression node

Parameters:
  `visitor` - Object ( implementing `ExpressionVisitor`) whose methods are called during traversing a expression node of the expression tree.
Returns:
  Object which should be passed to the processing algorithm of the parent expression node
Throws:
  `ExceptionVisitExpression` - Exception occurred the OData library while traversing the tree
  `ODataApplicationException` - Exception thrown by the application who implemented the visitor

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