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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:
* Vincent Lorenzo (CEA LIST) vincent.lorenzo@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.views.modelexplorer.handler;
import java.util.ArrayList;
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.core.runtime.Platform;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.papyrus.infra.core.sasheditor.contentprovider.IPageManager;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.core.utils.ServiceUtilsForActionHandlers;
import org.eclipse.papyrus.infra.emf.utils.EMFHelper;
import org.eclipse.ui.handlers.HandlerUtil;
/**
* This provides facilities to get the TransactionEditingDomain and the PageManager from the Model Explorer
*
*
*
*/
public abstract class AbstractModelExplorerHandler extends AbstractHandler {
/**
* Returns the
*
* @return
* the current editing domain
*/
protected TransactionalEditingDomain getEditingDomain() {
TransactionalEditingDomain editingDomain = null;
try {
editingDomain = org.eclipse.papyrus.infra.core.utils.ServiceUtilsForActionHandlers.getInstance().getTransactionalEditingDomain();
} catch (ServiceException e) {
// we are closing the editor, so the model explorer has nothing to display
// e.printStackTrace();
}
return editingDomain;
}
/**
* Returns the page manager
*
* @return
* the page manager
*/
protected IPageManager getPageManager() {
IPageManager pageManager = null;
try {
pageManager = ServiceUtilsForActionHandlers.getInstance().getIPageManager();
} catch (ServiceException e) {
// we are closing the editor, so the model explorer has nothing to display
// e.printStackTrace();
}
return pageManager;
}
/**
* Adapt the specified object to the requested type, if possible.
* Return null if the object can't be adapted.
*
* @param object
* @param expectedClassType
* @return The adapted object, or null.
*/
@SuppressWarnings("unchecked")
private <T> T adapt(Object object, Class<T> expectedClassType) {
EObject eobject = EMFHelper.getEObject(object);
if (eobject != null && expectedClassType.isInstance(eobject)) {
return (T) eobject;
}
// Try global mechanism
{
T ele = Platform.getAdapterManager().getAdapter(object, expectedClassType);
if (ele != null) {
return ele;
}
// Try as EObject if the expectedClasType is sub-type of EObject.
if (EObject.class.isAssignableFrom(expectedClassType)) {
// to EObject
eobject = Platform.getAdapterManager().getAdapter(object, EObject.class);
if (eobject != null && expectedClassType.isInstance(eobject)) {
return (T) eobject;
}
}
}
// Can't be adapted
return null;
}
/**
* Filter the list, and only retain objects that can be adapted to the specified type
*
* @param objects
* @param class1
* @return
*/
private <T> List<T> getAllElementAdaptedToType(List<Object> list, Class<T> expectedClassType) {
List<T> res = new ArrayList<T>();
for (Object cur : list) {
T adapted = adapt(cur, expectedClassType);
if (adapted != null) {
res.add(adapted);
}
}
return res;
}
/**
* Get all selected element of the specified type.
*
* @param expectedType
* @return
* @throws ExecutionException
*/
@SuppressWarnings("unchecked")
protected <T> List<T> getCurrentSelectionAdaptedToType(ExecutionEvent event, Class<T> expectedType) throws ExecutionException {
// Get selection from the workbench
ISelection selection = HandlerUtil.getCurrentSelectionChecked(event);
// Get the selected objects according to the type of the selected
if (selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
return getAllElementAdaptedToType(structuredSelection.toList(), expectedType);
} else if (selection instanceof TreeSelection) {
TreeSelection treeSelection = (TreeSelection) selection;
return getAllElementAdaptedToType(treeSelection.toList(), expectedType);
}
return null;
}
}
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