de.fhdo.elexis.perspective.handler.DeleteHandler.java Source code

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Here is the source code for de.fhdo.elexis.perspective.handler.DeleteHandler.java

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/*******************************************************************************
 * Copyright (c) 2011, fhdo and Elexis
 * 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:
 *     Bernhard Rimatzki, Thorsten Wagner, Pascal Proksch, Sven Lttmann
  - initial implementation
 *    
 *******************************************************************************/

package de.fhdo.elexis.perspective.handler;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.internal.dialogs.SelectPerspectiveDialog;
import org.eclipse.ui.internal.registry.PerspectiveDescriptor;
import org.eclipse.ui.internal.registry.PerspectiveRegistry;

import de.fhdo.elexis.Messages;

/**
 * Deletes a selected perspectives from the preference store.
 * 
 * This class pops up a dialog to select a perspective from the preference store to be deleted.
 * 
 * @author Bernhard Rimatzki, Thorsten Wagner, Pascal Proksch, Sven Lttmann
 * @version 1.0
 * 
 */

public class DeleteHandler extends AbstractHandler implements IHandler {

    @Override
    @SuppressWarnings("all")
    public Object execute(ExecutionEvent event) throws ExecutionException {

        IWorkbenchWindow mainWindow = HandlerUtil.getActiveWorkbenchWindowChecked(event);
        PerspectiveRegistry perspRegistry = (PerspectiveRegistry) WorkbenchPlugin.getDefault()
                .getPerspectiveRegistry();

        //
        // Open the dialog to select a stored perspective to be deleted
        // If 'Cancel' is pressed return
        //
        SelectPerspectiveDialog selectionDialog = new SelectPerspectiveDialog(mainWindow.getShell(), perspRegistry);

        if (selectionDialog.open() == SelectPerspectiveDialog.CANCEL)
            return null;

        //
        // Ask if the user really wants to delete the selected perspective
        //
        if (!MessageDialog.openQuestion(mainWindow.getShell(), Messages.DeleteHandler_ReallyDelete,
                String.format(Messages.DeleteHandler_Really_Want_To_Delete_selected_Perspective,
                        selectionDialog.getSelection().getLabel())))
            return null;

        //
        // Get the selected perspective description
        //
        PerspectiveDescriptor pDesc = (PerspectiveDescriptor) selectionDialog.getSelection();

        //
        // Delete the selected perspective from the preference store
        //
        perspRegistry.deletePerspective(pDesc);

        //
        // If the perspective could not be deleted it is still present in the
        // preference store and thus we can check for it
        //
        PerspectiveDescriptor pd2 = (PerspectiveDescriptor) perspRegistry
                .findPerspectiveWithLabel(pDesc.getLabel());

        if (pd2 != null)
            MessageDialog.openInformation(mainWindow.getShell(), Messages.DeleteHandler_ErrorWhileDeleting,
                    Messages.DeleteHandler_CannotDeleteInternalPerspective);

        return null;
    }

}