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
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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