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/*******************************************************************************
* Copyright (c) 2005 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
/*
* $$RCSfile: EMFWorkbenchContextFactory.java,v $$
* $$Revision: 1.4 $$ $$Date: 2005/06/16 20:14:27 $$
*/
package org.eclipse.jem.internal.util.emf.workbench;
import java.util.*;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectNature;
import org.eclipse.core.runtime.*;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.jem.internal.util.emf.workbench.nls.EMFWorkbenchResourceHandler;
import org.eclipse.jem.util.RegistryReader;
import org.eclipse.jem.util.emf.workbench.*;
import org.eclipse.jem.util.emf.workbench.nature.EMFNature;
import org.eclipse.jem.util.logger.proxy.Logger;
import org.eclipse.jem.util.plugin.JEMUtilPlugin;
public class EMFWorkbenchContextFactory {
public static final EMFWorkbenchContextFactory INSTANCE;
static {
INSTANCE = createFactoryInstance();
}
private final Class CONTRIBUTOR_CLASS = IEMFContextContributor.class;
protected Map emfContextCache = new WeakHashMap();
private static EMFWorkbenchContextFactory createFactoryInstance() {
EMFWorkbenchContextFactory factory = createFactoryInstanceFromExtension();
if (factory == null)
factory = new EMFWorkbenchContextFactory();
return factory;
}
private static EMFWorkbenchContextFactory createFactoryInstanceFromExtension() {
final EMFWorkbenchContextFactory[] factoryHolder = new EMFWorkbenchContextFactory[1];
RegistryReader reader = new RegistryReader(JEMUtilPlugin.ID, "internalWorkbenchContextFactory") { //$NON-NLS-1$
public boolean readElement(IConfigurationElement element) {
if (element.getName().equals("factoryClass")) //$NON-NLS-1$
try {
factoryHolder[0] = (EMFWorkbenchContextFactory)element.createExecutableExtension("name"); //$NON-NLS-1$
return true;
} catch (CoreException e) {
Logger.getLogger().logError(e);
}
return false;
}
};
reader.readRegistry();
return factoryHolder[0];
}
/**
* Constructor for EMFNatureFactory.
*/
protected EMFWorkbenchContextFactory() {
super();
}
protected void cacheEMFContext(IProject aProject, EMFWorkbenchContextBase emfContext) {
if (aProject != null && emfContext != null)
emfContextCache.put(aProject, emfContext);
}
protected EMFWorkbenchContextBase getCachedEMFContext(IProject aProject) {
if (aProject != null)
return (EMFWorkbenchContextBase) emfContextCache.get(aProject);
return null;
}
/**
* <code>aProject</code> is either being closed or deleted so we need to cleanup our cache.
*/
public void removeCachedProject(IProject aProject) {
if (aProject != null)
emfContextCache.remove(aProject);
}
/**
* Return a new or existing EMFNature on <code>aProject</code>. Allow the <code>contributor</code>
* to contribute to the new or existing nature prior to returning.
*/
public EMFWorkbenchContextBase createEMFContext(IProject aProject, IEMFContextContributor contributor) {
if (aProject == null)
throw new IllegalStateException("[EMFWorkbenchContextBase]" + EMFWorkbenchResourceHandler.getString("EMFWorkbenchContextFactory_UI_0")); //$NON-NLS-1$ //$NON-NLS-2$
if (!aProject.isAccessible())
throw new IllegalStateException("[EMFWorkbenchContextBase]" + EMFWorkbenchResourceHandler.getString("EMFWorkbenchContextFactory_UI_1", new Object[]{aProject.getName()})); //$NON-NLS-1$ //$NON-NLS-2$
EMFWorkbenchContextBase context = getCachedEMFContext(aProject);
boolean contributorFound = false;
if (context == null) {
context = primCreateEMFContext(aProject);
cacheEMFContext(aProject, context);
contributorFound = initializeEMFContextFromContributors(aProject, context, contributor);
}
if (contributor != null && context != null && !contributorFound)
contributor.primaryContributeToContext(context);
return context;
}
protected boolean initializeEMFContextFromContributors(IProject aProject, EMFWorkbenchContextBase emfContext, IEMFContextContributor contributor) {
boolean contributorFound = false;
if (aProject == null || emfContext == null)
return contributorFound;
List runtimes = EMFNature.getRegisteredRuntimes(aProject);
for (int i = 0; i < runtimes.size(); i++) {
IProjectNature nature = (IProjectNature) runtimes.get(i);
if (nature != null && CONTRIBUTOR_CLASS.isInstance(nature)) {
if (nature == contributor)
contributorFound = true;
((IEMFContextContributor) nature).primaryContributeToContext(emfContext);
}
}
return contributorFound;
}
protected boolean isNatureEnabled(IProject aProject, String natureId) {
try {
return aProject.isNatureEnabled(natureId);
} catch (CoreException e) {
return false;
}
}
protected String[] getNatureIds(IProject aProject) {
try {
if (aProject.isAccessible())
return aProject.getDescription().getNatureIds();
} catch (CoreException e) {
}
return null;
}
protected IProjectNature getNature(IProject aProject, String natureId) {
try {
return aProject.getNature(natureId);
} catch (CoreException e) {
return null;
}
}
protected EMFWorkbenchContextBase primCreateEMFContext(IProject aProject) {
return new EMFWorkbenchContextBase(aProject);
}
/**
* Return an existing EMFNature on <code>aProject</code>.
*/
public EMFWorkbenchContextBase getEMFContext(IProject aProject) {
return getCachedEMFContext(aProject);
}
public ResourceSetWorkbenchSynchronizer createSynchronizer(ResourceSet aResourceSet, IProject aProject) {
return new ResourceSetWorkbenchSynchronizer(aResourceSet, aProject);
}
}
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