org.apache.derby.impl.sql.compile
Class RemapCRsVisitor

java.lang.Object
  org.apache.derby.impl.sql.compile.RemapCRsVisitor

All Implemented Interfaces:

Visitor

public class RemapCRsVisitor

extends java.lang.Object

implements Visitor

Remap/unremap the CRs to the underlying expression.

Author:

jerry

Field Summary

private boolean

remap

Constructor Summary

RemapCRsVisitor(boolean remap)

Method Summary

boolean	skipChildren(Visitable node) No need to go below a SubqueryNode.
boolean	stopTraversal() Method that is called to see if query tree traversal should be stopped before visiting all nodes.
Visitable	visit(Visitable node) Don't do anything unless we have a ColumnReference node.

Methods inherited from class java.lang.Object

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

Field Detail

remap

private boolean remap

Constructor Detail

RemapCRsVisitor

public RemapCRsVisitor(boolean remap)

Method Detail

visit

public Visitable visit(Visitable node)
                throws StandardException

Don't do anything unless we have a ColumnReference node.

Specified by:

visit in interface Visitor

Parameters:

node - the node to process

Returns:

me

Throws:

StandardException - on error

skipChildren

public boolean skipChildren(Visitable node)

No need to go below a SubqueryNode.

Specified by:

skipChildren in interface Visitor

Parameters:

node - the node to process

Returns:

Whether or not to go below the node.

stopTraversal

public boolean stopTraversal()

Description copied from interface: Visitor

Method that is called to see if query tree traversal should be stopped before visiting all nodes. Useful for short circuiting traversal if we already know we are done.

Specified by:

stopTraversal in interface Visitor

Returns:

true/false