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

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

All Implemented Interfaces:

QueryReformulationProvider

public class QueryReformulator
extends java.lang.Object
implements QueryReformulationProvider

Responsible for reformulating a query along AutoMed pathways (GAV, LAV or BAV). Reformulation logic is the same irrespective of the reformulation technique(GAV, BAV, LAV). This is because the functionality to create composite views takes care of providing the correct set of views to the reformulation class. Query reformulator is constructed as an empty instance. When using the reformulate() method, the source schema, target schema and the query processor configuration is provided. Because of caching of composite and atomics views at lower levels, its very cheap to have any number of instances of this class and just use reformulate method whenever needed.

Author:

Sandeep Mittal, Lucas Zamboulis

Field Summary

protected java.util.logging.Logger

_logger

Constructor Summary

QueryReformulator()
Constructs an instance of this class.

Method Summary

static void	main(java.lang.String[] args)
void	reformulate(ASG query, Schema source, Schema[] targets, java.lang.String integrationSemantics, QueryProcessorConfiguration qpc) Reformulate an IQL query based on a given configuration

Methods inherited from class java.lang.Object

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

Field Detail

_logger

protected java.util.logging.Logger _logger

Constructor Detail

QueryReformulator

public QueryReformulator()

Constructs an instance of this class.

Method Detail

reformulate

public void reformulate(ASG query,
                        Schema source,
                        Schema[] targets,
                        java.lang.String integrationSemantics,
                        QueryProcessorConfiguration qpc)
                 throws QueryReformulationException

Description copied from interface: QueryReformulationProvider

Reformulate an IQL query based on a given configuration

Specified by:

reformulate in interface QueryReformulationProvider

Parameters:

query - an ASG object of an IQL query

integrationSemantics - Semantics of how to combine results from various target databases.

qpc - a {@link QueryProcessingConfiguration) object specific for query reformulation

Throws:

QueryReformulationException

main

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

Throws:

java.lang.Exception