EDIT

package eu.etaxonomy.taxeditor.view;

import java.util.Map;

import java.util.Map.Entry;

import org.eclipse.jface.action.ContributionItem;

import org.eclipse.jface.action.IContributionItem;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.widgets.Menu;

import org.eclipse.swt.widgets.MenuItem;

import org.eclipse.ui.IWorkbenchWindow;

import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.actions.CompoundContributionItem;

/**

 * Generic context menu for opening elements in the taxeditor.

 *

 */

public class CdmViewerContextMenu extends CompoundContributionItem {

    @Override

    protected IContributionItem[] getContributionItems() {

        IContributionItem[] contributionItems = new IContributionItem[] {

                new ContributionItem() {

                    @Override

                    public void fill(Menu menu, int index) {

                        MenuItem addItem = new MenuItem(menu, SWT.CASCADE);

                        addItem.setText("Open in...");

                        Menu addMenu = new Menu(menu);

                        addItem.setMenu(addMenu);

                        final IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();

                        final ISelection selection = window.getActivePage().getSelection();

                        if(selection instanceof IStructuredSelection){

                            Object firstElement = ((IStructuredSelection) selection).getFirstElement();

                            Map<Entry<Class<?>, String>, ICdmViewer> nameViewerMap = CdmViewerUtil.getNameViewerMap(firstElement);

                            for(Entry<Entry<Class<?>, String>, ICdmViewer> entry:nameViewerMap.entrySet()){

                                Entry<Class<?>, String> viewerClass = entry.getKey();

                                MenuItem menuItem = new MenuItem(addMenu, SWT.NONE);

                                menuItem.setText(viewerClass.getValue());

                                menuItem.addSelectionListener(new OpenInViewerListener(entry.getValue(), firstElement, viewerClass.getKey()));

                            }

                        }

                    }

                }

        };

        return contributionItems;

    }

    private class OpenInViewerListener extends SelectionAdapter {

        private final ICdmViewer cdmViewer;

        private final Object input;

        private final Class<?> viewerClass;

        public OpenInViewerListener(ICdmViewer cdmViewer, Object input, Class<?> viewerClass) {

            super();

            this.cdmViewer = cdmViewer;

            this.input = input;

            this.viewerClass = viewerClass;

        }

        @Override

        public void widgetSelected(SelectionEvent e) {

            cdmViewer.show(input, viewerClass);

        }

    }

}