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/*
* Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
* 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.compare;
import org.eclipse.emf.cdo.CDOObject;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDUtil;
import org.eclipse.emf.cdo.common.model.EMFUtil;
import org.eclipse.emf.cdo.util.CDOUtil;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.Monitor;
import org.eclipse.emf.compare.Comparison;
import org.eclipse.emf.compare.EMFCompare;
import org.eclipse.emf.compare.EMFCompare.Builder;
import org.eclipse.emf.compare.conflict.IConflictDetector;
import org.eclipse.emf.compare.diff.IDiffEngine;
import org.eclipse.emf.compare.equi.IEquiEngine;
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.IEqualityHelperFactory;
import org.eclipse.emf.compare.match.IMatchEngine;
import org.eclipse.emf.compare.match.eobject.IEObjectMatcher;
import org.eclipse.emf.compare.match.eobject.IdentifierEObjectMatcher;
import org.eclipse.emf.compare.postprocessor.IPostProcessor;
import org.eclipse.emf.compare.req.IReqEngine;
import org.eclipse.emf.compare.scope.IComparisonScope;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import com.google.common.base.Function;
/**
* A class with many overridable factory methods that help to create EMF {@link Comparison comparisons}.
*
* @author Eike Stepper
*/
public class CDOCompare
{
public Comparison compare(IComparisonScope scope)
{
Function<EObject, String> idFunction = createIDFunction();
IEObjectMatcher matcher = createMatcher(idFunction);
IEqualityHelperFactory equalityHelperFactory = createEqualityHelperFactory();
IComparisonFactory comparisonFactory = createComparisonFactory(equalityHelperFactory);
EMFCompare comparator = createComparator(matcher, comparisonFactory);
Comparison comparison = comparator.compare(scope);
comparison.eAdapters().add(new ComparisonScopeAdapter(scope));
return comparison;
}
protected CDOIDFunction createIDFunction()
{
return new CDOIDFunction();
}
protected IdentifierEObjectMatcher createMatcher(Function<EObject, String> idFunction)
{
return new IdentifierEObjectMatcher(idFunction);
}
protected IEqualityHelperFactory createEqualityHelperFactory()
{
return new DefaultEqualityHelperFactory();
}
protected IComparisonFactory createComparisonFactory(IEqualityHelperFactory equalityHelperFactory)
{
return new DefaultComparisonFactory(equalityHelperFactory);
}
protected EMFCompare createComparator(IEObjectMatcher matcher, IComparisonFactory comparisonFactory)
{
Builder builder = EMFCompare.builder();
IMatchEngine matchEngine = createMatchEngine(matcher, comparisonFactory);
if (matchEngine != null)
{
builder.setMatchEngine(matchEngine);
}
IDiffEngine diffEngine = createDiffEngine();
if (diffEngine != null)
{
builder.setDiffEngine(diffEngine);
}
IReqEngine reqEngine = createRequirementEngine();
if (reqEngine != null)
{
builder.setRequirementEngine(reqEngine);
}
IEquiEngine equiEngine = createEquivalenceEngine();
if (equiEngine != null)
{
builder.setEquivalenceEngine(equiEngine);
}
IPostProcessor.Descriptor.Registry<?> registry = createPostProcessorRegistry();
if (registry != null)
{
builder.setPostProcessorRegistry(registry);
}
IConflictDetector conflictDetector = createConflictDetector();
if (conflictDetector != null)
{
builder.setConflictDetector(conflictDetector);
}
return builder.build();
}
protected CDOMatchEngine createMatchEngine(IEObjectMatcher matcher, IComparisonFactory comparisonFactory)
{
return new CDOMatchEngine(matcher, comparisonFactory);
}
protected IDiffEngine createDiffEngine()
{
return null;
}
protected IReqEngine createRequirementEngine()
{
return null;
}
protected IEquiEngine createEquivalenceEngine()
{
return null;
}
protected IPostProcessor.Descriptor.Registry<?> createPostProcessorRegistry()
{
return null;
}
protected IConflictDetector createConflictDetector()
{
return null;
}
public static IComparisonScope getScope(Comparison comparison)
{
ComparisonScopeAdapter adapter = EMFUtil.getAdapter(comparison, ComparisonScopeAdapter.class);
if (adapter == null)
{
return null;
}
return adapter.getScope();
}
/**
* An {@link CDOIDFunction ID function} that considers the {@link CDOID}s of {@link CDOObject objects}.
*
* @author Eike Stepper
*/
public static class CDOIDFunction implements Function<EObject, String>
{
public String apply(EObject o)
{
CDOObject object = CDOUtil.getCDOObject(o);
CDOID id = object.cdoID();
StringBuilder builder = new StringBuilder();
CDOIDUtil.write(builder, id);
return builder.toString();
}
}
/**
* A {@link DefaultMatchEngine match engine} that treats {@link Resource resources} as {@link EObject EObjects}.
*
* @author Eike Stepper
*/
public static final class CDOMatchEngine extends DefaultMatchEngine
{
CDOMatchEngine(IEObjectMatcher matcher, IComparisonFactory comparisonFactory)
{
super(matcher, comparisonFactory);
}
@Override
protected void match(Comparison comparison, IComparisonScope scope, final Notifier left, final Notifier right,
final Notifier origin, Monitor monitor)
{
match(comparison, scope, (EObject)left, (EObject)right, (EObject)origin, monitor);
}
}
/**
* @author Eike Stepper
*/
private static final class ComparisonScopeAdapter extends AdapterImpl
{
private IComparisonScope scope;
public ComparisonScopeAdapter(IComparisonScope scope)
{
this.scope = scope;
}
public final IComparisonScope getScope()
{
return scope;
}
@Override
public boolean isAdapterForType(Object type)
{
return type == ComparisonScopeAdapter.class;
}
}
}
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