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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.ui.menu;
import java.util.Collection;
import java.util.Collections;
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.ecore.EObject;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.ui.util.ServiceUtilsForHandlers;
import org.eclipse.ui.ISources;
/**
* 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 AbstractCommonCommandHandler extends AbstractHandler {
/**
* Iterate over current selection and build a list of the {@link EObject} contained in the selection.
*
* @return the currently selected {@link EObject}
*/
protected abstract List<EObject> getSelectedElements();
/**
*
* @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*
* @param event
* @return null
* @throws ExecutionException
*/
@Override
public abstract Object execute(ExecutionEvent event) throws ExecutionException;
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() {
List<EObject> elts = getSelectedElements();
return !(elts.size() == 0);
}
protected List<?> getSelection() {
return selection;
}
protected List<?> selection = Collections.EMPTY_LIST;
/**
*
* @return true if the command can be executed
*/
public boolean isVisible() {
return isEnabled();
}
}
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