EDIT

package eu.etaxonomy.taxeditor.molecular.handler;

import org.eclipse.core.commands.AbstractHandler;

import org.eclipse.core.commands.ExecutionEvent;

import org.eclipse.core.commands.ExecutionException;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.TreeNode;

import org.eclipse.ui.PartInitException;

import org.eclipse.ui.handlers.HandlerUtil;

import eu.etaxonomy.cdm.model.molecular.Sequence;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

import eu.etaxonomy.taxeditor.molecular.Messages;

import eu.etaxonomy.taxeditor.molecular.TaxeditorMolecularPlugin;

import eu.etaxonomy.taxeditor.molecular.editor.AlignmentEditor;

import eu.etaxonomy.taxeditor.molecular.editor.AlignmentEditorInput;

/**

 * Opens the alignment editor from the CDM tree.

 *

 * @author Ben Stöver

 * @author pplitzner

 */

public class EditSequenceHandler extends AbstractHandler {

    private org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(EditSequenceHandler.class);

    @Override

    public Object execute(ExecutionEvent event) throws ExecutionException {

        ISelection currentSelection = HandlerUtil.getCurrentSelection(event);

        TreeNode treeNodeOfSelection = EditorUtil.getTreeNodeOfSelection(currentSelection);

        if(treeNodeOfSelection != null && treeNodeOfSelection.getValue() instanceof Sequence){

            AlignmentEditorInput input = new AlignmentEditorInput(((Sequence)treeNodeOfSelection.getValue()).getUuid());  //TODO Should there always be a new instance created here? What if the specified CDM node is already opened in an AlignmentEditor? => Possible create Singleton that keeps instances by sequence objects in a map.

            try {

                TaxeditorMolecularPlugin.getDefault().getWorkbench()

                .getActiveWorkbenchWindow().getActivePage().openEditor(input, AlignmentEditor.ID);

            }

            catch (PartInitException e) {

                logger.error(Messages.EditSequenceHandler_COULD_NOT_OPEN, e);

            }

        }

        return null;

    }

}