Package org.apache.derby.impl.sql.compile

Class HasCorrelatedCRsVisitor

  • All Implemented Interfaces:
    Visitor
    class HasCorrelatedCRsVisitor
extends java.lang.Object
implements Visitor
    Find out if we have an correlated column reference anywhere below us. Stop traversal as soon as we find one.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private boolean hasCorrelatedCRs  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      (package private) boolean hasCorrelatedCRs()
      Indicate whether we found the node in question
      (package private) void setHasCorrelatedCRs​(boolean value)
      Shortcut to set if hasCorrelatedCRs
      boolean skipChildren​(Visitable v)
      Method that is called to indicate whether we should skip all nodes below this node for traversal.
      boolean stopTraversal()
      Stop traversal if we found the target node
      Visitable visit​(Visitable node)
      If we have found the target node, we are done.
      boolean visitChildrenFirst​(Visitable v)
      Method that is called to see if visit() should be called on the children of node before it is called on node itself.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • hasCorrelatedCRs

        private boolean hasCorrelatedCRs

    • Constructor Detail

      • HasCorrelatedCRsVisitor

        HasCorrelatedCRsVisitor()
        Construct a visitor

    • Method Detail

      • visit

        public Visitable visit​(Visitable node)
        If we have found the target node, we are done.
        Specified by:
        visit in interface Visitor
        Parameters:
        node - the node to process
        Returns:
        me

      • stopTraversal

        public boolean stopTraversal()
        Stop traversal if we found the target node
        Specified by:
        stopTraversal in interface Visitor
        Returns:
        true/false

      • skipChildren

        public boolean skipChildren​(Visitable v)
        Description copied from interface: Visitor
        Method that is called to indicate whether we should skip all nodes below this node for traversal. Useful if we want to effectively ignore/prune all branches under a particular node.

        Differs from stopTraversal() in that it only affects subtrees, rather than the entire traversal.

        Specified by:
        skipChildren in interface Visitor
        Parameters:
        v - the node to process
        Returns:
        true/false

      • visitChildrenFirst

        public boolean visitChildrenFirst​(Visitable v)
        Description copied from interface: Visitor
        Method that is called to see if visit() should be called on the children of node before it is called on node itself. If this method always returns true, the visitor will walk the tree bottom-up. If it always returns false, the tree is visited top-down.
        Specified by:
        visitChildrenFirst in interface Visitor
        Parameters:
        v - the top node of a sub-tree about to be visited
        Returns:
        true if node's children should be visited before node, false otherwise

      • hasCorrelatedCRs

        boolean hasCorrelatedCRs()
        Indicate whether we found the node in question
        Returns:
        true/false

      • setHasCorrelatedCRs

        void setHasCorrelatedCRs​(boolean value)
        Shortcut to set if hasCorrelatedCRs
        Parameters:
        value - true/false