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

java.lang.Object
  net.sf.farrago.fennel.calc.CalcRexImplementorTableImpl.AbstractCalcRexImplementor
      net.sf.farrago.fennel.calc.CalcRexImplementorTableImpl.InstrDefImplementor

All Implemented Interfaces:

CalcRexImplementor

Direct Known Subclasses:

CalcRexImplementorTableImpl.AddCharSetNameInstrImplementor, CalcRexImplementorTableImpl.BinaryNumericMakeSametypeImplementor, CalcRexImplementorTableImpl.BinaryStringMakeSametypeImplementor, CalcRexImplementorTableImpl.CastDecimalImplementor, CalcRexImplementorTableImpl.MakeOperandsDoubleImplementor, CalcRexImplementorTableImpl.TrimImplementor

Enclosing class:

CalcRexImplementorTableImpl

public static class CalcRexImplementorTableImpl.InstrDefImplementor
extends CalcRexImplementorTableImpl.AbstractCalcRexImplementor

Generic implementor that takes a CalcProgramBuilder.InstructionDef which implements an operator by generating a call to a given instruction.

If you need to tweak the arguments to the instruction, you can override makeRegList(net.sf.farrago.fennel.calc.RexToCalcTranslator, org.eigenbase.rex.RexCall).

Field Summary

protected CalcProgramBuilder.InstructionDef

instr The instruction with which to implement this operator.

Constructor Summary

CalcRexImplementorTableImpl.InstrDefImplementor(CalcProgramBuilder.InstructionDef instr)
Creates an instruction implementor

Method Summary

CalcReg	implement(RexCall call, RexToCalcTranslator translator) Generates instructions to implement this call, and returns the register which holds the result.
protected List<CalcReg>	makeRegList(RexToCalcTranslator translator, RexCall call) Creates the list of registers which will be arguments to the instruction call.

Methods inherited from class net.sf.farrago.fennel.calc.CalcRexImplementorTableImpl.AbstractCalcRexImplementor

canImplement

Methods inherited from class java.lang.Object

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

Field Detail

instr

protected final CalcProgramBuilder.InstructionDef instr

The instruction with which to implement this operator.

Constructor Detail

CalcRexImplementorTableImpl.InstrDefImplementor

CalcRexImplementorTableImpl.InstrDefImplementor(CalcProgramBuilder.InstructionDef instr)

Creates an instruction implementor

Parameters:

instr - The instruction with which to implement this operator, must not be null

"Precondition:"

null != instr, instr != null

Method Detail

implement

public CalcReg implement(RexCall call,
                         RexToCalcTranslator translator)

Description copied from interface: CalcRexImplementor

Generates instructions to implement this call, and returns the register which holds the result.

makeRegList

protected List<CalcReg> makeRegList(RexToCalcTranslator translator,
                                    RexCall call)

Creates the list of registers which will be arguments to the instruction call. i.e implment all the operands of the call and create a result register for the call.

The 0th argument is assumed to hold the result of the call.