Package com.espertech.esper.common.internal.epl.expression.visitor

Class ExprNodeStreamSelectVisitor

java.lang.Object
com.espertech.esper.common.internal.epl.expression.visitor.ExprNodeStreamSelectVisitor
All Implemented Interfaces:
ExprNodeVisitor
public class ExprNodeStreamSelectVisitor extends Object implements ExprNodeVisitor
Visitor that collects event property identifier information under expression nodes. The visitor can be configued to not visit aggregation nodes thus ignoring properties under aggregation nodes such as sum, avg, min/max etc.

  • Constructor Details

    • ExprNodeStreamSelectVisitor

      public ExprNodeStreamSelectVisitor(boolean visitAggregateNodes)
      Ctor.
      Parameters:
      visitAggregateNodes - true to indicate that the visitor should visit aggregate nodes, or false if the visitor ignores aggregate nodes

  • Method Details

    • isVisit

      public boolean isVisit(ExprNode exprNode)
      Description copied from interface: ExprNodeVisitor
      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.
      Specified by:
      isVisit in interface ExprNodeVisitor
      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

    • hasStreamSelect

      public boolean hasStreamSelect()

    • visit

      public void visit(ExprNode exprNode)
      Description copied from interface: ExprNodeVisitor
      Visit the given expression node.
      Specified by:
      visit in interface ExprNodeVisitor
      Parameters:
      exprNode - is the expression node to visit