org.apache.derby.impl.sql.compile

Class HasCorrelatedCRsVisitor

java.lang.Object

org.apache.derby.impl.sql.compile.HasCorrelatedCRsVisitor

All Implemented Interfaces:

Visitor

public 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 and Description
private boolean	hasCorrelatedCRs

Constructor Summary

Constructors

Constructor and Description
HasCorrelatedCRsVisitor() Construct a visitor

Method Summary

Modifier and Type	Method and Description
boolean	hasCorrelatedCRs() Indicate whether we found the node in question
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

public 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

public boolean hasCorrelatedCRs()

Indicate whether we found the node in question

Returns:

true/false

setHasCorrelatedCRs

public void setHasCorrelatedCRs(boolean value)

Shortcut to set if hasCorrelatedCRs

Parameters:

value - true/false