org.eigenbase.oj.rex
Class OJRexUnaryExpressionImplementor

java.lang.Object
  org.eigenbase.oj.rex.OJRexUnaryExpressionImplementor

All Implemented Interfaces:

OJRexImplementor

public class OJRexUnaryExpressionImplementor
extends Object
implements OJRexImplementor

OJRexUnaryExpressionImplementor implements OJRexImplementor for row expressions which can be translated to instances of OpenJava UnaryExpression.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/oj/rex/OJRexUnaryExpressionImplementor.java#9 $

Author:

Angel Chang

Field Summary

private int

ojUnaryExpressionOrdinal

Constructor Summary

OJRexUnaryExpressionImplementor(int ojUnaryExpressionOrdinal)

Method Summary

boolean	canImplement(RexCall call) Tests whether it is possible to implement a call.
Expression	implement(RexToOJTranslator translator, RexCall call, Expression[] operands) Implements a single RexCall.

Methods inherited from class java.lang.Object

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

Field Detail

ojUnaryExpressionOrdinal

private final int ojUnaryExpressionOrdinal

Constructor Detail

OJRexUnaryExpressionImplementor

public OJRexUnaryExpressionImplementor(int ojUnaryExpressionOrdinal)

Method Detail

implement

public Expression implement(RexToOJTranslator translator,
                            RexCall call,
                            Expression[] operands)

Description copied from interface: OJRexImplementor

Implements a single RexCall.

Specified by:

implement in interface OJRexImplementor

Parameters:

translator - provides translation context

call - the call to be translated

operands - call's operands, which have already been translated independently

canImplement

public boolean canImplement(RexCall call)

Description copied from interface: OJRexImplementor

Tests whether it is possible to implement a call.

Specified by:

canImplement in interface OJRexImplementor

Parameters:

call - the call for which translation is being considered

Returns:

whether the call can be implemented