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/*****************************************************************************
* Copyright (c) 2012 Cedric Dumoulin.
*
* 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:
* Cedric Dumoulin - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.emf.utils;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.core.services.ServiceNotFoundException;
import org.eclipse.papyrus.infra.core.services.ServicesRegistry;
import org.eclipse.papyrus.infra.core.utils.AbstractServiceUtils;
import org.eclipse.ui.ISources;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchPartSite;
/**
* ServicesUtils based on the Handler's IEvaluationContext.
* This class can be used for both the {@link AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)} and the {@link AbstractHandler#setEnabled(Object)} methods.
*
*
* @author Cedric Dumoulin
*
*/
public class ServiceUtilsForIEvaluationContext extends AbstractServiceUtils<IEvaluationContext> {
private ServiceUtilsForIEvaluationContext() {
//Singleton
}
/**
*
* @see org.eclipse.papyrus.infra.core.utils.AbstractServiceUtils#getServiceRegistry(java.lang.Object)
*
* @param from
* @return
* @throws ServiceException
*/
@Override
public ServicesRegistry getServiceRegistry(IEvaluationContext from) throws ServiceException {
IEvaluationContext evaluationContext = from;
//Search for the IWorkbenchPartSite from which the ExecutionEvent is sent (May be different that the Active one)
Object workbenchPartSite = evaluationContext.getVariable("org.eclipse.ui.IWorkbenchPartSite");
if(workbenchPartSite instanceof IWorkbenchPartSite) {
IWorkbenchPartSite site = (IWorkbenchPartSite)workbenchPartSite;
Object registry = site.getAdapter(ServicesRegistry.class);
if(registry != null && registry instanceof ServicesRegistry) {
return (ServicesRegistry)registry;
}
//Search for the IWorkbenchPart from which the ExecutionEvent is sent (May be different that the Active one)
IWorkbenchPart workbenchPart = site.getPart();
registry = workbenchPart.getAdapter(ServicesRegistry.class);
if(registry != null && registry instanceof ServicesRegistry) {
return (ServicesRegistry)registry;
}
}
Object selection = evaluationContext.getVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME);
ServicesRegistry registry;
//Try to resolve the ServicesRegistry from the current selection
if(selection instanceof ISelection && !((ISelection)selection).isEmpty()) {
try {
registry = ServiceUtilsForSelection.getInstance().getServiceRegistry((ISelection)selection);
if(registry != null) {
return registry;
}
} catch (ServiceException ex) {
//Ignore and try another ServiceUtils
}
}
//We couldn't retrieve the ServiceRegistry from the current selection.
//Try to adapt the active part to the ServicesRegistry
Object _part = evaluationContext.getVariable(ISources.ACTIVE_PART_NAME);
if (_part instanceof IWorkbenchPart) {
IWorkbenchPart part = (IWorkbenchPart)_part;
registry = (ServicesRegistry)(part).getAdapter(ServicesRegistry.class);
if(registry != null) {
return registry;
}
}
// nothing found
throw new ServiceNotFoundException("The ServiceRegistry cannot be resolved");
}
public static ServiceUtilsForIEvaluationContext getInstance() {
return instance;
}
private static final ServiceUtilsForIEvaluationContext instance = new ServiceUtilsForIEvaluationContext();
}
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