EDIT

/**

 * 

 */

package eu.etaxonomy.taxeditor.navigation.navigator.handler;

import java.util.ArrayList;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

import java.util.UUID;

import org.apache.log4j.Logger;

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.core.commands.common.NotDefinedException;

import org.eclipse.core.commands.operations.IUndoContext;

import org.eclipse.jface.dialogs.MessageDialog;

import org.eclipse.jface.viewers.TreeSelection;

import org.eclipse.swt.widgets.Display;

import org.eclipse.ui.PartInitException;

import org.eclipse.ui.handlers.HandlerUtil;

import eu.etaxonomy.cdm.api.conversation.IConversationEnabled;

import eu.etaxonomy.cdm.api.service.config.TaxonDeletionConfigurator;

import eu.etaxonomy.cdm.model.common.CdmBase;

import eu.etaxonomy.cdm.model.taxon.Classification;

import eu.etaxonomy.cdm.model.taxon.ITaxonTreeNode;

import eu.etaxonomy.cdm.model.taxon.TaxonNode;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

import eu.etaxonomy.taxeditor.editor.MultiPageTaxonEditor;

import eu.etaxonomy.taxeditor.editor.Page;

import eu.etaxonomy.taxeditor.editor.TaxonEditorInput;

import eu.etaxonomy.taxeditor.editor.name.TaxonNameEditor;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.navigation.NavigationUtil;

import eu.etaxonomy.taxeditor.navigation.navigator.operation.ChangeAcceptedTaxonToSynonymOperation;

import eu.etaxonomy.taxeditor.navigation.navigator.operation.DeleteOperation;

import eu.etaxonomy.taxeditor.operation.AbstractPostOperation;

import eu.etaxonomy.taxeditor.operation.IPostOperationEnabled;

import eu.etaxonomy.taxeditor.ui.dialog.selection.TaxonNodeSelectionDialog;

/**

 * <p>ChangeAcceptedTaxonToSynonymHandler class.</p>

 *

 * @author n.hoffmann

 * @created Jan 4, 2010

 * @version 1.0

 */

public class ChangeAcceptedTaxonToSynonymHandler extends DeleteHandler

		implements IHandler, IPostOperationEnabled {

	private static final Logger logger = Logger

			.getLogger(ChangeAcceptedTaxonToSynonymHandler.class);

	private ChangeAcceptedTaxonToSynonymOperation operation;

	private UUID newAcceptedTaxonNodeUuid;

	private TaxonNameEditor editor;

	/* (non-Javadoc)

	 * @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)

	 */

	/** {@inheritDoc} */

	public Object execute(ExecutionEvent event) throws ExecutionException {

		 activePage = HandlerUtil.getActiveWorkbenchWindow(event).getActivePage();

		taxonNavigator = NavigationUtil.showNavigator();

		TreeSelection selection = (TreeSelection) HandlerUtil.getCurrentSelection(event);

		String plural = selection.size() > 1 ? "s" : "";

		// Prompt user for confirmation

		Iterator selectionIterator = selection.iterator();

		Set<ITaxonTreeNode> treeNodes = new HashSet<ITaxonTreeNode>();

		while (selectionIterator.hasNext()){

			Object object = selectionIterator.next();

			if(object instanceof ITaxonTreeNode) {

                treeNodes.add((ITaxonTreeNode) object);

            }

		}

		boolean allEditorsClosed = true;

		for (ITaxonTreeNode treeNode : treeNodes){

			if(treeNode instanceof TaxonNode) {

				allEditorsClosed &= closeObsoleteEditor((TaxonNode) treeNode);

			}

		}

		AbstractPostOperation operation = null;

		if (treeNodes.size() == 1 ){

			try {

				ITaxonTreeNode treeNode = treeNodes.iterator().next();

				ITaxonTreeNode oldAcceptedTaxonNode =treeNode;

				// check if taxon has no children

				if(((TaxonNode)oldAcceptedTaxonNode).getCountChildren() > 0) {

					MessagingUtils.warningDialog("Prerequisite not met", this, 

							"The accepted taxon must not have any childen. You need to move all childen to " +

							"another taxon node in the TaxonNavigator before attempting to turn the accepted " +

							"taxon into a synonym.");

					return null;

				}

				/*if(((TaxonNode)oldAcceptedTaxonNode).getTaxon().hasSynonyms()) {

					EditorUtil.warningDialog("Prerequisite not met", this, 

							"The accepted taxon must not have any synonyms. You need to move all synonyms to " +

							"another taxon before attempting to turn the accepted " +

							"taxon into a synonym.");

					return null;

				}*/

				List<UUID> excludeTaxa = new ArrayList<UUID>();

				excludeTaxa.add(oldAcceptedTaxonNode.getUuid());

				TaxonNode newAcceptedTaxonNode = TaxonNodeSelectionDialog.select(HandlerUtil.getActiveShell(event), 

						taxonNavigator.getConversationHolder(), 

						"Choose the accepted taxon", 

						excludeTaxa, 

						null, 

						((TaxonNode)oldAcceptedTaxonNode).getClassification());			

				if (newAcceptedTaxonNode == null) {

					return null;

				}

				if (allEditorsClosed){

						operation = new ChangeAcceptedTaxonToSynonymOperation(event.getCommand().getName(), NavigationUtil.getUndoContext(), oldAcceptedTaxonNode, newAcceptedTaxonNode,

								taxonNavigator, taxonNavigator);

						NavigationUtil.executeOperation(operation);

						//}

				}

			} catch (NotDefinedException e) {

				MessagingUtils.warn(getClass(), "Command name not set");

			}

		} else{

			if( MessageDialog.openConfirm(HandlerUtil.getActiveShell(event), "Moving to synonymy", "The operation move accepted taxon to synonymy is available only for a single taxon.")){

				return null;

			}

		}

		return null;

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.operations.IPostOperationEnabled#postOperation(eu.etaxonomy.cdm.model.common.CdmBase)

	 */

	/** {@inheritDoc} */

	public boolean postOperation(CdmBase objectAffectedByOperation) {

		Display.getDefault().asyncExec(new Runnable(){

			public void run() {

				EditorUtil.close(editor.getMultiPageTaxonEditor());

				try {

					MultiPageTaxonEditor possibleOpenEditor = (MultiPageTaxonEditor) EditorUtil.findEditorByTaxonNodeUuid(newAcceptedTaxonNodeUuid);

					if(possibleOpenEditor != null){

						EditorUtil.close(possibleOpenEditor);

					}

					EditorUtil.openTaxonNode(newAcceptedTaxonNodeUuid);

				} catch (PartInitException e) {

					MessagingUtils.error(this.getClass(), e);

					throw new RuntimeException(e);

				} catch (Exception e) {

					MessagingUtils.warningDialog("Could not create Taxon", this, e.getMessage());

				}

			}

		});

		return true;

	}

	/**

	 * <p>onComplete</p>

	 *

	 * @return a boolean.

	 */

	public boolean onComplete() {

		// TODO Auto-generated method stub

		return false;

	}	

}