org.eigenbase.rex
Class RexTransformer

java.lang.Object
  org.eigenbase.rex.RexTransformer

public class RexTransformer
extends Object

Takes a tree of RexNode objects and transforms it into another in one sense equivalent tree. Nodes in tree will be modified and hence tree will not remain unchanged.

NOTE: You must validate the tree of RexNodes before using this class.

Since:

Mar 8, 2004

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rex/RexTransformer.java#16 $

Author:

wael

Field Summary

private int	isParentsCount
private RexBuilder	rexBuilder
private RexNode	root
private Set<SqlOperator>	transformableOperators

Constructor Summary

RexTransformer(RexNode root, RexBuilder rexBuilder)

Method Summary

private boolean	isBoolean(RexNode node)
private boolean	isNullable(RexNode node)
private boolean	isTransformable(RexNode node)
RexNode	transformNullSemantics()
private RexNode	transformNullSemantics(RexNode node)

Methods inherited from class java.lang.Object

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

Field Detail

root

private RexNode root

rexBuilder

private final RexBuilder rexBuilder

isParentsCount

private int isParentsCount

transformableOperators

private final Set<SqlOperator> transformableOperators

Constructor Detail

RexTransformer

public RexTransformer(RexNode root,
                      RexBuilder rexBuilder)

Method Detail

isBoolean

private boolean isBoolean(RexNode node)

isNullable

private boolean isNullable(RexNode node)

isTransformable

private boolean isTransformable(RexNode node)

transformNullSemantics

public RexNode transformNullSemantics()

transformNullSemantics

private RexNode transformNullSemantics(RexNode node)