org.eigenbase.util
Class Util.BacktrackVisitor<R>

java.lang.Object
  org.eigenbase.sql.util.SqlBasicVisitor<R>
      org.eigenbase.util.Util.BacktrackVisitor<R>

All Implemented Interfaces:

SqlVisitor<R>

Enclosing class:

Util

private static class Util.BacktrackVisitor<R>
extends SqlBasicVisitor<R>

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.sql.util.SqlBasicVisitor

SqlBasicVisitor.ArgHandler<R>, SqlBasicVisitor.ArgHandlerImpl<R>

Field Summary

protected int	currentOffset Only valid if currentParrent is a SqlCall or SqlNodeList Describes the offset within the parent
protected SqlNode	currentParent Used to keep track of the current SqlNode parent of a visiting node.

Constructor Summary

private

Util.BacktrackVisitor()

Method Summary

Integer	getCurrentOffset()
SqlNode	getCurrentParent()
R	visit(SqlCall call) Visits a call to a SqlOperator.
R	visit(SqlNodeList nodeList) Visits a list of SqlNode objects.

Methods inherited from class org.eigenbase.sql.util.SqlBasicVisitor

visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Field Detail

currentParent

protected SqlNode currentParent

Used to keep track of the current SqlNode parent of a visiting node. A value of null mean no parent. NOTE: In case of extending SqlBasicVisitor, remember that parent value might not be set depending on if and how visit(SqlCall) and visit(SqlNodeList) is implemented.

currentOffset

protected int currentOffset

Only valid if currentParrent is a SqlCall or SqlNodeList Describes the offset within the parent

Constructor Detail

Util.BacktrackVisitor

private Util.BacktrackVisitor()

Method Detail

getCurrentParent

public SqlNode getCurrentParent()

getCurrentOffset

public Integer getCurrentOffset()

visit

public R visit(SqlNodeList nodeList)

Description copied from interface: SqlVisitor

Visits a list of SqlNode objects.

Specified by:

visit in interface SqlVisitor<R>

Overrides:

visit in class SqlBasicVisitor<R>

Parameters:

nodeList - list of nodes

See Also:

SqlNodeList.accept(SqlVisitor)

visit

public R visit(SqlCall call)

Description copied from interface: SqlVisitor

Visits a call to a SqlOperator.

Specified by:

visit in interface SqlVisitor<R>

Overrides:

visit in class SqlBasicVisitor<R>

Parameters:

call - Call

See Also:

SqlCall.accept(SqlVisitor)