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/*****************************************************************************
* Copyright (c) 2010 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:
*
* Yann Tanguy (CEA LIST) yann.tanguy@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.modelexplorer.handler;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.commands.IHandler;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.UnexecutableCommand;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gmf.runtime.common.core.command.CompositeCommand;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest;
import org.eclipse.papyrus.properties.util.EMFHelper;
import org.eclipse.papyrus.service.edit.service.ElementEditServiceUtils;
import org.eclipse.papyrus.service.edit.service.IElementEditService;
/**
* Default handler for Delete command used in the ModelExplorer contextual menu.
*
*/
public class DeleteCommandHandler extends AbstractCommandHandler implements IHandler {
/** Current deleteCommand for selection (updated in {@link DeleteCommandHandler#isEnabled()}) */
private Command deleteCommand;
/**
* <pre>
*
* Build the delete command for a set of EObject selected in the ModelExplorer.
* The delete command is given by the {@link IElementEditService} of selected
* elements.
*
* @return the composite deletion command for current selection
*
* @TODO : Manage possible Diagrams listed in the selection
*
* </pre>
*/
private Command buildCommand() {
ICommand gmfCommand = null;
// Parameters store the Request parameters of the previous request
// if multiple elements are selected for deletion.
Map parameters = new HashMap();
for(EObject selectedEObject : getSelectedElements()) {
if(selectedEObject == null) {
continue;
}
IElementEditService provider = ElementEditServiceUtils.getCommandProvider(selectedEObject);
if(provider == null) {
continue;
}
// Retrieve delete command from the Element Edit service
DestroyElementRequest request = new DestroyElementRequest(selectedEObject, false);
// Add parameters (contains the list of previously dependents to be deleted
// by previous commands.
request.getParameters().putAll(parameters);
ICommand deleteCommand = provider.getEditCommand(request);
// Add current EObject destroy command to the global command
gmfCommand = CompositeCommand.compose(gmfCommand, deleteCommand);
// Store the new parameters for next delete command.
parameters.clear();
parameters.putAll(request.getParameters());
}
if(gmfCommand == null) {
return UnexecutableCommand.INSTANCE;
}
Command emfCommand = new GMFtoEMFCommandWrapper(gmfCommand.reduce());
return emfCommand;
}
/**
*
* @see org.eclipse.papyrus.modelexplorer.handler.AbstractCommandHandler#getCommand()
*
* @return current command (only built here when the stored command is null)
*/
protected Command getCommand() {
// Don't cache the command, as it is no more refreshed by isEnabled().
return buildCommand();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isEnabled() {
//we need to test if selected element is not a meta-class
List<EObject> selectedElements = getSelectedElements();
for(EObject current : selectedElements) {
//FIXME EMFHelper should be moved in an utils plugin
if(EMFHelper.isReadOnly(current)) {
return false;
}
}
// Don't compute the delete command to know if it is enabled,
// it can be WAY too slow...
return true;
}
}
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