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

java.lang.Object
  |
  +--uk.ac.bbk.dcs.automed.qproc.QueryReformulator

public class QueryReformulator

extends java.lang.Object

The class that goes through an ASG that applies to a global schema and reformulates the ASG so that it applies to all local schemas

Field Summary

static java.lang.String	lowerBound
static java.lang.String	upperBound
protected java.util.HashMap	viewmap

Constructor Summary

protected	QueryReformulator()
	QueryReformulator(Schema sourceschema, Schema[] targetschemata)
	QueryReformulator(Schema sourceschema, Schema[] targetschemata, java.lang.String functionType) Constructs a QueryReformulator object containing view definitions for the constructs of source in terms of the constructs of targets assuming the appropriate transformation pathways exist.

Method Summary

void	reformulate(ASG g) Reformulates the query represented by the ASG g according to the view defintions it has stored.
Schema	source() Returns the global schema
Schema[]	targets() Returns the array of local schemas

Methods inherited from class java.lang.Object

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

Field Detail

viewmap

protected java.util.HashMap viewmap

upperBound

public static final java.lang.String upperBound

See Also:

Constant Field Values

lowerBound

public static final java.lang.String lowerBound

See Also:

Constant Field Values

Constructor Detail

QueryReformulator

protected QueryReformulator()

QueryReformulator

public QueryReformulator(Schema sourceschema,
                         Schema[] targetschemata)
                  throws java.lang.Exception

QueryReformulator

public QueryReformulator(Schema sourceschema,
                         Schema[] targetschemata,
                         java.lang.String functionType)
                  throws java.lang.Exception

Constructs a QueryReformulator object containing view definitions for the constructs of source in terms of the constructs of targets assuming the appropriate transformation pathways exist.

Method Detail

reformulate

public void reformulate(ASG g)
                 throws NotFoundException

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

NotFoundException

source

public Schema source()

Returns the global schema

targets

public Schema[] targets()

Returns the array of local schemas