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/*******************************************************************************
* Copyright (c) 2013, 2014 Obeo.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.compare.match.impl;
import org.eclipse.emf.compare.match.DefaultComparisonFactory;
import org.eclipse.emf.compare.match.DefaultEqualityHelperFactory;
import org.eclipse.emf.compare.match.DefaultMatchEngine;
import org.eclipse.emf.compare.match.IComparisonFactory;
import org.eclipse.emf.compare.match.IMatchEngine;
import org.eclipse.emf.compare.match.eobject.EqualityHelperExtensionProvider;
import org.eclipse.emf.compare.match.eobject.EqualityHelperExtensionProviderDescriptorRegistryImpl;
import org.eclipse.emf.compare.match.eobject.IEObjectMatcher;
import org.eclipse.emf.compare.match.eobject.WeightProvider;
import org.eclipse.emf.compare.match.eobject.WeightProviderDescriptorRegistryImpl;
import org.eclipse.emf.compare.scope.IComparisonScope;
import org.eclipse.emf.compare.utils.UseIdentifiers;
/**
* The default implementation of the {@link IMatchEngine.Factory.Registry}.
*
* @author <a href="mailto:axel.richard@obeo.fr">Axel Richard</a>
* @since 3.0
*/
public class MatchEngineFactoryImpl implements IMatchEngine.Factory {
/** The match engine created by this factory. */
protected IMatchEngine matchEngine;
/** Ranking of this match engine. */
private int ranking;
/** A match engine needs a WeightProvider in case of this match engine do not use identifiers. */
private WeightProvider.Descriptor.Registry weightProviderRegistry;
/** A match engine may need a specific equality helper extension provider. */
private EqualityHelperExtensionProvider.Descriptor.Registry equalityHelperExtensionProviderRegistry;
/** Tells this factory whether the engines it creates should use identifiers or not. */
private UseIdentifiers shouldUseIdentifiers;
/**
* Constructor that instantiate a {@link DefaultMatchEngine}. This match engine will use a the standalone
* weight provider registry {@link WeightProviderDescriptorRegistryImpl.createStandaloneInstance()}.
*/
public MatchEngineFactoryImpl() {
this(UseIdentifiers.WHEN_AVAILABLE, WeightProviderDescriptorRegistryImpl.createStandaloneInstance(),
EqualityHelperExtensionProviderDescriptorRegistryImpl.createStandaloneInstance());
}
/**
* Constructor that instantiate a {@link DefaultMatchEngine} that will use identifiers as specified by the
* given {@code useIDs} enumeration. This match engine will use a the standalone weight provider registry
* {@link WeightProviderDescriptorRegistryImpl.createStandaloneInstance()}.
*
* @param useIDs
* the kinds of matcher to use.
*/
public MatchEngineFactoryImpl(UseIdentifiers useIDs) {
this(useIDs, WeightProviderDescriptorRegistryImpl.createStandaloneInstance(),
EqualityHelperExtensionProviderDescriptorRegistryImpl.createStandaloneInstance());
}
/**
* Constructor that instantiate a {@link DefaultMatchEngine} that will use identifiers as specified by the
* given {@code useIDs} enumeration.
*
* @param useIDs
* the kinds of matcher to use.
* @param weightProviderRegistry
* A match engine needs a WeightProvider in case of this match engine do not use identifiers.
*/
public MatchEngineFactoryImpl(UseIdentifiers useIDs,
WeightProvider.Descriptor.Registry weightProviderRegistry) {
this(useIDs, weightProviderRegistry,
EqualityHelperExtensionProviderDescriptorRegistryImpl.createStandaloneInstance());
}
/**
* Constructor that instantiate a {@link DefaultMatchEngine} that will use identifiers as specified by the
* given {@code useIDs} enumeration.
*
* @param useIDs
* the kinds of matcher to use.
* @param weightProviderRegistry
* A match engine needs a WeightProvider in case of this match engine do not use identifiers.
* @param equalityHelperExtensionProviderRegistry
* A match engine may need a Equality Helper Extension.
*/
public MatchEngineFactoryImpl(UseIdentifiers useIDs,
WeightProvider.Descriptor.Registry weightProviderRegistry,
EqualityHelperExtensionProvider.Descriptor.Registry equalityHelperExtensionProviderRegistry) {
this.shouldUseIdentifiers = useIDs;
this.weightProviderRegistry = weightProviderRegistry;
this.equalityHelperExtensionProviderRegistry = equalityHelperExtensionProviderRegistry;
}
/**
* Constructor that instantiate a {@link DefaultMatchEngine} with the given parameters.
*
* @param matcher
* The matcher that will be in charge of pairing EObjects together for this comparison process.
* @param comparisonFactory
* factory that will be use to instantiate Comparison as return by match() methods.
* @deprecated Using this will ignore any weight provider or equality helper extension provided through
* extension points. Use another of the constructors if you need this functionality.
*/
@Deprecated
public MatchEngineFactoryImpl(IEObjectMatcher matcher, IComparisonFactory comparisonFactory) {
matchEngine = new DefaultMatchEngine(matcher, comparisonFactory);
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.match.IMatchEngine.Factory#getMatchEngine()
*/
public IMatchEngine getMatchEngine() {
if (matchEngine == null) {
final IComparisonFactory comparisonFactory = new DefaultComparisonFactory(
new DefaultEqualityHelperFactory());
final IEObjectMatcher matcher = DefaultMatchEngine.createDefaultEObjectMatcher(
shouldUseIdentifiers, weightProviderRegistry, equalityHelperExtensionProviderRegistry);
matchEngine = new DefaultMatchEngine(matcher, comparisonFactory);
}
return matchEngine;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.match.IMatchEngine.Factory#getRanking()
*/
public int getRanking() {
return ranking;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.match.IMatchEngine.Factory#setRanking(int)
*/
public void setRanking(int r) {
ranking = r;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.match.IMatchEngine.Factory#isMatchEngineFactoryFor(org.eclipse.emf.compare.scope.IComparisonScope)
*/
public boolean isMatchEngineFactoryFor(IComparisonScope scope) {
return true;
}
/**
* The match engine needs a WeightProvider in case of this match engine do not use identifiers.
*
* @param registry
* the registry to associate with the match engine.
*/
void setWeightProviderRegistry(WeightProvider.Descriptor.Registry registry) {
this.weightProviderRegistry = registry;
// TODO remove this condition once the deprecated MatchEngineFactoryImpl(IEObjectMatcher,
// IComparisonFactory) is removed
if (shouldUseIdentifiers != null) {
this.matchEngine = null;
}
}
/**
* The match engine may need a Equality Helper Extension.
*
* @param equalityHelperExtensionProviderRegistry
* the registry to associate with the match engine.
*/
public void setEqualityHelperExtensionProviderRegistry(
EqualityHelperExtensionProvider.Descriptor.Registry equalityHelperExtensionProviderRegistry) {
this.equalityHelperExtensionProviderRegistry = equalityHelperExtensionProviderRegistry;
// TODO remove this condition once the deprecated MatchEngineFactoryImpl(IEObjectMatcher,
// IComparisonFactory) is removed
if (shouldUseIdentifiers != null) {
this.matchEngine = null;
}
}
}
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