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/*****************************************************************************
* Copyright (c) 2012 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
* Gabriel Pascual (ALL4TEC) gabriel.pascual@all4tec.net - Bug 372322
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.common.handler;
import java.lang.ref.WeakReference;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.CanonicalEditPolicy;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.gmfdiag.common.Activator;
import org.eclipse.papyrus.infra.gmfdiag.common.helper.DiagramHelper;
import org.eclipse.papyrus.infra.ui.editor.IMultiDiagramEditor;
import org.eclipse.papyrus.infra.ui.util.ServiceUtilsForHandlers;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.PlatformUI;
/**
* Handles the refresh command on the Papyrus editor (F5)
*
* Refreshes the active diagram
*
* @author Camille Letavernier
*/
// TODO: To be refactored. Move to infra/gmfdiag/menu when the plugin exists
public class RefreshHandler extends AbstractHandler {
/**
* The registry of refresh handler parts that are NOT specific to an editor
* We use weak references so that we do not block the garbage collection of objects
*/
private static Collection<WeakReference<IRefreshHandlerPart>> PARTS = new LinkedList<WeakReference<IRefreshHandlerPart>>();
/**
* Register a refresher part that is not attached to any editor
*
* @param refresher
* The refresher part
*/
public static synchronized void register(IRefreshHandlerPart refresher) {
PARTS.add(new WeakReference<IRefreshHandlerPart>(refresher));
}
/**
* @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*/
@Override
public Object execute(ExecutionEvent event) throws ExecutionException {
IEditorPart activeEditor;
try {
activeEditor = ServiceUtilsForHandlers.getInstance().getService(IMultiDiagramEditor.class, event);
} catch (ServiceException ex) {
Activator.log.error(ex);
return null;
}
updateUMLDiagram();
// Hooks must be called before the actual refresh, because they typically reset cache
// Call the relevant hooks
callRefresherHooks(activeEditor);
// Refresh the base GMF objects
DiagramHelper.refresh(activeEditor);
return null;
}
/**
* Update UML diagram with canonical policy.
*
* <p>
* This implementation comes from refactor of Generated code for the Bug 372322. It was generated in an update command to refresh current diagram.
* </p>
*/
private void updateUMLDiagram() {
ISelection selection = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService().getSelection();
if (selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
if (structuredSelection.size() != 1) {
if (structuredSelection.getFirstElement() instanceof EditPart && ((EditPart) structuredSelection.getFirstElement()).getModel() instanceof View) {
EObject modelElement = ((View) ((EditPart) structuredSelection.getFirstElement()).getModel()).getElement();
List<CanonicalEditPolicy> editPolicies = CanonicalEditPolicy.getRegisteredEditPolicies(modelElement);
for (Iterator<CanonicalEditPolicy> it = editPolicies.iterator(); it.hasNext();) {
CanonicalEditPolicy nextEditPolicy = it.next();
nextEditPolicy.refresh();
}
}
}
}
}
private synchronized void callRefresherHooks(IEditorPart activeEditor) {
Iterator<WeakReference<IRefreshHandlerPart>> iterator = PARTS.iterator();
while (iterator.hasNext()) {
WeakReference<IRefreshHandlerPart> wr = iterator.next();
IRefreshHandlerPart part = wr.get();
if (part != null) {
part.refresh(activeEditor);
} else {
iterator.remove();
}
}
}
}
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