net.sf.farrago.fennel.calc
Class CalcRexImplementorTableImpl.AbstractCalcRexAggImplementor

java.lang.Object
  net.sf.farrago.fennel.calc.CalcRexImplementorTableImpl.AbstractCalcRexAggImplementor

All Implemented Interfaces:

CalcRexAggImplementor

Direct Known Subclasses:

CalcRexImplementorTableImpl.CountCalcRexImplementor, CalcRexImplementorTableImpl.FirstValueCalcRexImplementor, CalcRexImplementorTableImpl.HistogramAggRexImplementor, CalcRexImplementorTableImpl.LastValueCalcRexImplementor, CalcRexImplementorTableImpl.MinMaxCalcRexImplementor, CalcRexImplementorTableImpl.SumCalcRexImplementor, CalcRexImplementorTableImpl.SumEmptyIsZeroCalcRexImplementor

Enclosing class:

CalcRexImplementorTableImpl

public abstract static class CalcRexImplementorTableImpl.AbstractCalcRexAggImplementor
extends Object
implements CalcRexAggImplementor

Abstract base class for classes which implement CalcRexAggImplementor.

Constructor Summary

CalcRexImplementorTableImpl.AbstractCalcRexAggImplementor()

Method Summary

boolean	canImplement(RexCall call) Returns whether this implementor can handle the given call.
void	implementInitAdd(RexCall call, CalcReg accumulatorRegister, RexToCalcTranslator translator) Generates instructions to initialize and add a new value to an aggregation.

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.farrago.fennel.calc.CalcRexAggImplementor

implementAdd, implementDrop, implementInitialize

Constructor Detail

CalcRexImplementorTableImpl.AbstractCalcRexAggImplementor

public CalcRexImplementorTableImpl.AbstractCalcRexAggImplementor()

Method Detail

implementInitAdd

public void implementInitAdd(RexCall call,
                             CalcReg accumulatorRegister,
                             RexToCalcTranslator translator)

Description copied from interface: CalcRexAggImplementor

Generates instructions to initialize and add a new value to an aggregation. This could call implementInitialize followed by implementAdd

Specified by:

implementInitAdd in interface CalcRexAggImplementor

Parameters:

call - The call to the aggregate function to be implemented

accumulatorRegister - The accumulator register

translator - Calculator code generator

canImplement

public boolean canImplement(RexCall call)

Description copied from interface: CalcRexAggImplementor

Returns whether this implementor can handle the given call.

Specified by:

canImplement in interface CalcRexAggImplementor

Parameters:

call - The call to the aggregate function to be implemented