net.esper.pattern
Interface EvalStateNodeVisitor
- All Known Implementing Classes:
- EvalStateNodePrinterVisitor
public interface EvalStateNodeVisitor
Interface for visiting each element in the evaluation node tree for an event expression (see Visitor pattern).
visit
Object visit(EvalStateNode node,
Object data)
- Invoked by each child node as part of accepting this visitor.
- Parameters:
node
- is the node in the composite tree accepting the visitordata
- is any additional useful to implementations
- Returns:
- any additional data useful to implementations or null