uk.ac.bbk.dcs.automed.qproc.reformulate
Class GAVQueryReformulationProvider

java.lang.Object
  uk.ac.bbk.dcs.automed.qproc.reformulate.GAVQueryReformulationProvider

public class GAVQueryReformulationProvider
extends java.lang.Object

The query reformulator accepts an IQL query on the source schema and rewrites it in terms of constructs of the target schemata.

To do this, on construction, the query reformulator traverses the pathways from the source schema to the target schemata and builds a view definition over target schema constructs for each source schema construct.

Field Summary

protected java.util.logging.Logger	logger
protected Schema	sourceSchema
protected Schema[]	targetSchemata
protected java.util.HashMap	viewmap Viewmap contains the constructs of the source schema in the LHS and the IQL view of each construct of the LHS in the RHS.

Constructor Summary

protected	GAVQueryReformulationProvider()
	GAVQueryReformulationProvider(Schema sourceschema, Schema[] targetschemata) Deprecated. use GAVQueryReformulationProvider(Schema, Schema[], QueryProcessorConfiguration) instead
	GAVQueryReformulationProvider(Schema sourceSchema, Schema[] targetSchemata, QueryProcessorConfiguration qpc)

Method Summary

protected void	buildViews() Traverses BAV pathways and builds GAV views.
void	finalize()
static void	main(java.lang.String[] args)
void	reformulate(ASG g, QueryProcessorConfiguration qrc) Reformulates the query represented by the ASG g according to the view defintions it has stored.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected java.util.logging.Logger logger

sourceSchema

protected Schema sourceSchema

targetSchemata

protected Schema[] targetSchemata

viewmap

protected java.util.HashMap viewmap

Viewmap contains the constructs of the source schema in the LHS and the IQL view of each construct of the LHS in the RHS.

Constructor Detail

GAVQueryReformulationProvider

protected GAVQueryReformulationProvider()

GAVQueryReformulationProvider

public GAVQueryReformulationProvider(Schema sourceschema,
                                     Schema[] targetschemata)
                              throws QueryReformulationException

Deprecated. use GAVQueryReformulationProvider(Schema, Schema[], QueryProcessorConfiguration) instead

Throws:

QueryReformulationException

GAVQueryReformulationProvider

public GAVQueryReformulationProvider(Schema sourceSchema,
                                     Schema[] targetSchemata,
                                     QueryProcessorConfiguration qpc)
                              throws QueryReformulationException

Parameters:

sourceschema - the source schema

targetschemata - the target schemata

qpc - the input configuration

Throws:

QueryReformulationException - if there was a problem building the view definitions of the source schema constructs over target schema constructs

Method Detail

buildViews

protected void buildViews()
                   throws QueryReformulationException

Traverses BAV pathways and builds GAV views.

Throws:

QueryReformulationException

IntegrityException

NotFoundException

reformulate

public void reformulate(ASG g,
                        QueryProcessorConfiguration qrc)
                 throws QueryReformulationException

Reformulates the query represented by the ASG g according to the view defintions it has stored.

Throws:

QueryReformulationException

finalize

public void finalize()

Overrides:

finalize in class java.lang.Object

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception