org.eclipse.papyrus.customization.properties.util.ActionUtil.java Source code

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Here is the source code for org.eclipse.papyrus.customization.properties.util.ActionUtil.java

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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:
 *  Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
 *****************************************************************************/
package org.eclipse.papyrus.customization.properties.util;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;

/**
 * Utility class for Actions
 * 
 * @author Camille Letavernier
 * 
 */
public class ActionUtil {

    /**
     * EMF can only handle collections of EObjects. However, as the
     * customization plugin relies a lot on EMF Facet, we often have to handle
     * objects that can be adapted to EObjects, but are not EObjects
     * themselves. This method adapts a collections of such objects to their
     * underlying EObjects, so that EMF can handle them.
     * Objects that cannot be adapted remain as-is in the collection.
     * 
     * @param selection
     *        The collection to adapt
     * @return
     *         The adapted selection
     */
    public static Collection<Object> getAdaptedSelection(Collection<? extends Object> selection) {
        Collection<Object> newSelection = new LinkedList<Object>();
        for (Object o : selection) {
            if (o instanceof IAdaptable) {
                EObject eObject = (EObject) ((IAdaptable) o).getAdapter(EObject.class);
                newSelection.add(eObject);
            } else {
                newSelection.add(o);
            }
        }
        return newSelection;
    }

    /**
     * EMF can only handle ISelection containing EObjects. However, as the
     * customization plugin relies a lot on EMF Facet, we often have to handle
     * objects that can be adapted to EObjects, but are not EObjects
     * themselves. This method adapts a ISelection of such objects to their
     * underlying EObjects, so that EMF can handle them.
     * Objects that cannot be adapted remain as-is in the selection.
     * 
     * @param sourceSelection
     *        The selection to adapt
     * @return
     *         The adapted selection
     */
    public static ISelection getAdaptedSelection(ISelection sourceSelection) {
        if (sourceSelection instanceof StructuredSelection) {
            StructuredSelection currentSelection = (StructuredSelection) sourceSelection;
            List<Object> newSelection = new LinkedList<Object>();

            Iterator<?> it = currentSelection.iterator();
            while (it.hasNext()) {
                Object object = it.next();
                if (object instanceof IAdaptable) {
                    EObject eObject = (EObject) ((IAdaptable) object).getAdapter(EObject.class);
                    if (eObject != null)
                        newSelection.add(eObject);
                    else
                        newSelection.add(object);
                }
            }

            StructuredSelection selection = new StructuredSelection(newSelection);
            return selection;
        } else {
            return sourceSelection;
        }
    }
}