com.espertech.esper.epl.expression.visitor
Interface ExprNodeVisitorWithParent

All Known Implementing Classes:

ExprNodeGroupingVisitorWParent, ExprNodeIdentifierCollectVisitorWContainer, ExprNodeIdentVisitorWParent, ExprNodePreviousVisitorWParent, ExprNodeSubselectDeclaredNoTraverseVisitor

public interface ExprNodeVisitorWithParent

Visitor interface for use with expression node trees, receives both the child node and the parent node (or null to indicate no parent node).

Method Summary

boolean	isVisit(ExprNode exprNode) Allows visitor to indicate whether to visit a given node.
void	visit(ExprNode exprNode, ExprNode parentExprNode) Visit the given expression node.

Method Detail

isVisit

boolean isVisit(ExprNode exprNode)

Allows visitor to indicate whether to visit a given node. Implicitly if a visitor doesn't visit a node it would also not visit any descendent child nodes of that node.

Parameters:

exprNode - is the node in questions

Returns:

true if the visitor wants to visit the child node (next call is visit), or false to skip child

visit

void visit(ExprNode exprNode,
           ExprNode parentExprNode)

Visit the given expression node.

Parameters:

exprNode - is the expression node to visit

parentExprNode - parent to visit