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/*****************************************************************************
* Copyright (c) 2015 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:
* Francois Le Fevre (CEA LIST) francois.le-fevre@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.nattable.modelexplorer.handlers;
import java.util.Collection;
import java.util.Collections;
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.core.expressions.IEvaluationContext;
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.EMFHelper;
import org.eclipse.papyrus.infra.nattable.model.nattable.nattableconfiguration.TableNamedElement;
import org.eclipse.papyrus.infra.ui.util.ServiceUtilsForHandlers;
import org.eclipse.ui.ISources;
import org.eclipse.ui.handlers.HandlerUtil;
/**
* This abstract command handler: - calculates the current selection -
* calculates the visibility and enablement based on command executability -
* executes the command in Papyrus command stack
*
*/
public abstract class AbstractGenericCommandHandler extends AbstractHandler {
protected abstract Command getCommand(ExecutionEvent event);
/**
* Iterate over current selection and build a list of the {@link EObject} contained in the selection.
*
* @return the currently selected {@link EObject}
*/
protected List<EObject> getSelectedElements() {
List<EObject> result = new LinkedList<EObject>();
for (Object element : getSelection()) {
EObject elementi = EMFHelper.getEObject(element);
if (elementi instanceof TableNamedElement) {
result.add(elementi);
}
}
return result;
}
/**
*
* @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 {
ISelection selection = HandlerUtil.getCurrentSelection(event);
this.selection = (selection instanceof IStructuredSelection) ? ((IStructuredSelection) selection).toList() : Collections.EMPTY_LIST;
getEditingDomain(event).getCommandStack().execute(getCommand(event));
} finally {
// clear the selection
this.selection = Collections.EMPTY_LIST;
}
return null;
}
protected TransactionalEditingDomain getEditingDomain(ExecutionEvent event) {
try {
return ServiceUtilsForHandlers.getInstance().getTransactionalEditingDomain(event);
} catch (ServiceException ex) {
return null;
}
}
@Override
public void setEnabled(Object evaluationContext) {
if (evaluationContext instanceof IEvaluationContext) {
Object selection = ((IEvaluationContext) evaluationContext).getVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME);
if (selection instanceof Collection<?>) {
this.selection = (selection instanceof List<?>) ? (List<?>) selection : new java.util.ArrayList<Object>((Collection<?>) selection);
} else if (selection instanceof IStructuredSelection) {
this.selection = ((IStructuredSelection) selection).toList();
}
setBaseEnabled(computeEnabled());
this.selection = Collections.EMPTY_LIST;
}
super.setEnabled(evaluationContext);
}
protected boolean computeEnabled() {
boolean result = true;
List<EObject> elts = getSelectedElements();
if (elts.size() == 0) {
result = false;
}
return result;
}
protected List<?> getSelection() {
return selection;
}
private List<?> selection = Collections.EMPTY_LIST;
}
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