uk.ac.bbk.dcs.automed.qproc.optimise
Class Optimiser

java.lang.Object
  uk.ac.bbk.dcs.automed.qproc.optimise.Optimiser

Direct Known Subclasses:

ChooseOptimiser, CollectionOperatorReorganiser, CollectionSimplification, CommonSubexpressionElimination, ComprehensionDistributor, ComprehensionHeadSimplifier, ComprehensionHeadSimplifierUndo, ConstantInPatternOptimiser, EmptyJoinOptimiser, EqualityFilterOptimiser, NestingOptimiser, RelationSKJEliminator, SQLWrapperSKJOptimiser, UnnestOptimiser

public abstract class Optimiser
extends java.lang.Object

Class Optimiser abstracts the functionality of optimisers.

Author:

Lucas Zamboulis

Field Summary

protected java.util.logging.Logger	logger
private QueryOptimisationProvider	qop
protected Schema[]	targets

Constructor Summary

Optimiser(QueryOptimisationProvider qop)

Method Summary

boolean	getValueBasedOptimisation()
boolean	optimise(ASG g, QueryProcessorConfiguration qpc)
boolean	optimise(ASG g, Schema[] automedTargets, QueryProcessorConfiguration qpc)
abstract boolean	optimise(Cell c, QueryProcessorConfiguration qpc)
void	setValueBasedOptimisation(boolean value)

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

qop

private QueryOptimisationProvider qop

targets

protected Schema[] targets

Constructor Detail

Optimiser

public Optimiser(QueryOptimisationProvider qop)

Method Detail

optimise

public boolean optimise(ASG g,
                        QueryProcessorConfiguration qpc)

Parameters:

g - ASG to be optimised

Returns:

true if optimiser had any effect

optimise

public boolean optimise(ASG g,
                        Schema[] automedTargets,
                        QueryProcessorConfiguration qpc)

Parameters:

g - ASG to be optimised

targets - AutoMed-level target schemas

Returns:

true if optimiser had any effect

optimise

public abstract boolean optimise(Cell c,
                                 QueryProcessorConfiguration qpc)
                          throws QueryOptimisationException

Throws:

QueryOptimisationException

setValueBasedOptimisation

public void setValueBasedOptimisation(boolean value)

getValueBasedOptimisation

public boolean getValueBasedOptimisation()