net.sf.farrago.ojrex
Class FarragoOJRexContextVariableImplementor

java.lang.Object
  net.sf.farrago.ojrex.FarragoOJRexContextVariableImplementor

All Implemented Interfaces:

OJRexImplementor

public class FarragoOJRexContextVariableImplementor
extends Object
implements OJRexImplementor

Implements Farrago specifics of OJRexImplementor for context variables such as "USER" and "SESSION_USER".

For example, "USER" becomes "connection.getContextVariable_USER()".

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/ojrex/FarragoOJRexContextVariableImplementor.java#9 $

Author:

Julian Hyde

Field Summary

private String

name

Constructor Summary

FarragoOJRexContextVariableImplementor(String name)

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

name

private final String name

Constructor Detail

FarragoOJRexContextVariableImplementor

public FarragoOJRexContextVariableImplementor(String name)

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