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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:
* Ansgar Radermacher (CEA LIST) - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.services.tracepoints.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.IAdaptable;
import org.eclipse.emf.common.command.Command;
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.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.emf.utils.BusinessModelResolver;
import org.eclipse.papyrus.infra.services.tracepoints.Activator;
import org.eclipse.papyrus.infra.ui.util.ServiceUtilsForHandlers;
import org.eclipse.ui.PlatformUI;
/**
* <pre>
*
* This abstract command handler manages:
* - current selection in order to build a list of the selected {@link EObject}
* - execute the command (returned by children) in Papyrus {@link TransactionalEditingDomain}
* - calculate the command enablement and visibility regarding the command executability
* (the command is now shown in menu if not executable).
*
* </pre>
*/
public abstract class AbstractCommandHandler extends AbstractHandler {
/**
* <pre>
*
* Returns the command to execute (to be implemented
* in children implementing this class)
*
* @return the command to execute
*
* </pre>
*/
protected abstract Command getCommand();
/**
* <pre>
* Get the selected element, the first selected element if several are selected or null
* if no selection or the selection is not an {@link EObject}.
*
* @return selected {@link EObject} or null
* </pre>
*
*/
protected EObject getSelectedElement() {
EObject eObject = null;
Object selection = null;
// Get current selection
selection = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService().getSelection();
// Get first element if the selection is an IStructuredSelection
if (selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
selection = structuredSelection.getFirstElement();
}
// Treat non-null selected object (try to adapt and return EObject)
if (selection != null) {
Object businessObject = BusinessModelResolver.getInstance().getBusinessModel(selection);
if (businessObject instanceof EObject) {
eObject = (EObject) businessObject;
}
}
return eObject;
}
/**
* <pre>
* Parse current selection and extract the list of {@link EObject} from
* this selection.
*
* This also tries to adapt selected element into {@link EObject}
* (for example to get the {@link EObject} from a selection in the ModelExplorer).
*
* @return a list of currently selected {@link EObject}
* </pre>
*
*/
protected List<EObject> getSelectedElements() {
List<EObject> selectedEObjects = new ArrayList<EObject>();
// Parse current selection
ISelection selection = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService().getSelection();
if (selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
for (Object current : structuredSelection.toArray()) {
// Adapt current selection to EObject
if (current instanceof IAdaptable) {
selectedEObjects.add(((IAdaptable) current).getAdapter(EObject.class));
}
}
} else { // Not a IStructuredSelection
if (selection != null) {
// Adapt current selection to EObject
if (selection instanceof IAdaptable) {
selectedEObjects.add(((IAdaptable) selection).getAdapter(EObject.class));
}
}
}
return selectedEObjects;
}
/**
*
* @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*
* @param event
* @return null
* @throws ExecutionException
*/
@Override
public Object execute(ExecutionEvent event) throws ExecutionException {
try {
ServiceUtilsForHandlers util = ServiceUtilsForHandlers.getInstance();
util.getTransactionalEditingDomain(event).getCommandStack().execute(getCommand());
} catch (ServiceException e) {
Activator.log.error("Unexpected error while executing command.", e); //$NON-NLS-1$
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isEnabled() {
return getCommand().canExecute();
}
/**
*
* @return true (visible) when the command can be executed.
*/
public boolean isVisible() {
return getCommand().canExecute();
}
}
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