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oracle.as.scheduler
Interface FilterVisitor

public interface FilterVisitor

Contract for implementing a visitor for traversing a filter instance. Filters are traversed from left-to-right, depth first. The following traversal methods are supported:

• In-order (infix) traversal.
• Pre-order (prefix) traversal.
• Post-order (postfix) traversal.

Nested Class Summary

static class

FilterVisitor.Order Traversal methods for filter expression visitation.

Method Summary

void	begin() Invoked prior to traversing the filter expression.
void	end() Invoked after traversing the filter expression.
FilterVisitor.Order	order() Specifies the order required by the visitor implementation.
void	visitLeftChild(Filter filter) Invoked once for every (left) child node encountered according to the traversal method.
void	visitParent(Filter filter) Invoked once for every parent node encountered according to the traversal method.
void	visitRightChild(Filter filter) Invoked once for every (left) child node encountered according to the traversal method.

Method Detail

order

FilterVisitor.Order order()

Specifies the order required by the visitor implementation.

Returns:

order required by the visitor implementation.

begin

void begin()

Invoked prior to traversing the filter expression.

end

void end()

Invoked after traversing the filter expression.

visitParent

void visitParent(Filter filter)
                 throws IllegalArgumentException

Invoked once for every parent node encountered according to the traversal method.

Parameters:

filter - being visited.

Throws:

IllegalArgumentException

visitLeftChild

void visitLeftChild(Filter filter)
                    throws IllegalArgumentException

Invoked once for every (left) child node encountered according to the traversal method.

Parameters:

filter - being visited.

Throws:

IllegalArgumentException

visitRightChild

void visitRightChild(Filter filter)
                     throws IllegalArgumentException

Invoked once for every (left) child node encountered according to the traversal method.

Parameters:

filter - being visited.

Throws:

IllegalArgumentException

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