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/*****************************************************************************
* Copyright (c) 2011 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.emf.providers;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EEnum;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.papyrus.infra.emf.providers.strategy.ContainmentBrowseStrategy;
import org.eclipse.papyrus.infra.emf.providers.strategy.SemanticEMFContentProvider;
import org.eclipse.papyrus.infra.emf.utils.HistoryUtil;
import org.eclipse.papyrus.infra.widgets.providers.EmptyContentProvider;
import org.eclipse.papyrus.infra.widgets.providers.EncapsulatedContentProvider;
import org.eclipse.papyrus.infra.widgets.strategy.IStrategyBasedContentProvider;
import org.eclipse.papyrus.infra.widgets.strategy.ProviderBasedBrowseStrategy;
import org.eclipse.papyrus.infra.widgets.strategy.StrategyBasedContentProvider;
import org.eclipse.papyrus.infra.widgets.strategy.TreeBrowseStrategy;
/**
* A global Content provider for EMF
*
* @author Camille Letavernier
*/
public class EMFContentProvider extends EncapsulatedContentProvider {
/**
*
* Constructor.
*
* @param feature
* The feature representing the reference for which we want to retrieve possible values
* @param eObject
*/
public EMFContentProvider(EObject editedEObject, EStructuralFeature feature) {
IStructuredContentProvider provider = getSemanticProvider(editedEObject, feature);
encapsulated = encapsulateProvider(provider, editedEObject, feature);
}
/**
* Returns the content provider associated to feature being edited
*
* @param editedEObject
* The object being edited
* @param feature
* The object's feature being edited
* @return
* A content provider returning all the values valid for the given feature
*/
protected IStructuredContentProvider getSemanticProvider(EObject editedEObject, EStructuralFeature feature) {
EClassifier type = feature.getEType();
if(type instanceof EEnum) {
return new EMFEnumeratorContentProvider(feature);
} else if(type instanceof EClass) {
return new SemanticEMFContentProvider(editedEObject, feature);
}
return EmptyContentProvider.instance;
}
/**
* Encapsulates the given content provider in a higher-level content provider
* The returned provider uses two different strategies to display and search
* elements, and adds a pattern filter and an History
*
* @param provider
* The ContentProvider to encapsulate
* @return
*/
protected EMFGraphicalContentProvider encapsulateProvider(IStructuredContentProvider provider, EObject editedEObject, EStructuralFeature feature) {
String historyId = HistoryUtil.getHistoryID(editedEObject, feature);
IStructuredContentProvider contentProvider;
if(provider instanceof ITreeContentProvider) {
contentProvider = getStrategyProvider((ITreeContentProvider)provider);
} else {
contentProvider = provider;
}
ResourceSet rs = editedEObject == null ? null : editedEObject.eResource() == null ? null : editedEObject.eResource().getResourceSet();
EMFGraphicalContentProvider graphicalProvider = new EMFGraphicalContentProvider(contentProvider, rs, historyId);
return graphicalProvider;
}
protected IStrategyBasedContentProvider getStrategyProvider(ITreeContentProvider provider) {
TreeBrowseStrategy browseStrategy = new ProviderBasedBrowseStrategy(provider);
TreeBrowseStrategy revealStrategy = new ContainmentBrowseStrategy(provider);
return new StrategyBasedContentProvider(browseStrategy, revealStrategy);
}
}
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