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

All Known Implementing Classes:

ExprNodeContextPropertiesVisitor, ExprNodeDeclaredVisitor, ExprNodeIdentifierAndStreamRefVisitor, ExprNodeIdentifierCollectVisitor, ExprNodeIdentifierVisitor, ExprNodeStreamSelectVisitor, ExprNodeStreamUseCollectVisitor, ExprNodeSubselectDeclaredDotVisitor, ExprNodeSummaryVisitor, ExprNodeTableAccessFinderVisitor, ExprNodeVariableVisitor, ExprNodeViewResourceVisitor

public interface ExprNodeVisitor

Visitor interface for use with expression node trees.

Method Summary

boolean	isVisit(ExprNode exprNode) Allows visitor to indicate whether to visit a given node.
void	visit(ExprNode exprNode) 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)

Visit the given expression node.

Parameters:

exprNode - is the expression node to visit