net.sf.saffron.rel.convert
Class FactoryConverterRule

java.lang.Object
  |
  +--net.sf.saffron.opt.VolcanoRule
        |
        +--net.sf.saffron.rel.convert.ConverterRule
              |
              +--net.sf.saffron.rel.convert.FactoryConverterRule

public class FactoryConverterRule

extends ConverterRule

Generic implementation of ConverterRule which lets a ConverterFactory do the work.

Since:

Jun 18, 2003

Version:

$Id: //open/saffron/src/net/sf/saffron/rel/convert/FactoryConverterRule.java#2 $

Author:

jhyde

Field Summary

private ConverterFactory

factory

Fields inherited from class net.sf.saffron.rel.convert.ConverterRule

inConvention, outConvention

Fields inherited from class net.sf.saffron.opt.VolcanoRule

description, planner

Constructor Summary

FactoryConverterRule(ConverterFactory factory, CallingConvention inConvention)

Method Summary

SaffronRel	convert(SaffronRel rel)
boolean	isGuaranteed() Returns true if this rule can convert any relational expression of the input convention.

Methods inherited from class net.sf.saffron.rel.convert.ConverterRule

getOutConvention, onMatch

Methods inherited from class net.sf.saffron.opt.VolcanoRule

convert, toString

Methods inherited from class java.lang.Object

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

Field Detail

factory

private final ConverterFactory factory

Constructor Detail

FactoryConverterRule

public FactoryConverterRule(ConverterFactory factory,
                            CallingConvention inConvention)

Method Detail

isGuaranteed

public boolean isGuaranteed()

Description copied from class: ConverterRule

Returns true if this rule can convert any relational expression of the input convention.

The union-to-java converter, for example, is not guaranteed, because it only works on unions.

Overrides:

isGuaranteed in class ConverterRule

convert

public SaffronRel convert(SaffronRel rel)

Specified by:

convert in class ConverterRule