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/*****************************************************************************
* Copyright (c) 2012 Cedric Dumoulin.
*
*
* 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:
* Cedric Dumoulin Cedric.dumoulin@lifl.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.example.infra.servicesregistry.retrieval.menu.handlers;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
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.runtime.IAdaptable;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.core.services.ServicesRegistry;
import org.eclipse.papyrus.infra.emf.utils.ServiceUtilsForResource;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.handlers.HandlerUtil;
/**
* A menu handler showing :
* <ul>
* <li>How to retrieve a UML element from any kind of selected object (using adapters)</li>
* <li>How to get the ServicesRegistry from an EObject</li>
* </ul>
*
* @author Cedric dumoulin
*
*/
public class LookupServiceRegistryFromEObjectHandler extends AbstractHandler implements IHandler {
/**
* @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)
* @param event
* @return
* @throws ExecutionException
*
*/
public Object execute(ExecutionEvent event) throws ExecutionException {
List<EObject> selectedProperties = getAllSelectionAdaptedToType( event, EObject.class );
if( selectedProperties == null) {
showErrorDialog(event, "No object selected", "Please select a Property First.");
return null;
}
// Get the ServiceRegistry for each of the selected object
List<ServicesRegistry> res = new ArrayList<ServicesRegistry>();
for( EObject selected : selectedProperties) {
// Get the servicesRegistry
try {
ServicesRegistry registry = ServiceUtilsForResource.getInstance().getServiceRegistry(selected.eResource());
res.add(registry);
System.out.println(" - " + selected + " [" + registry + "]");
} catch (ServiceException e) {
// Not found
res.add(null);
System.out.println(" - " + selected + " [Can't get ServicesRegistry !!!]");
}
//
}
IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);
showResults( window.getShell(), selectedProperties, res);
return null;
}
/**
* Show results in popup.
* @param selectedProperties
* @param res
*/
private void showResults(Shell shell, List<EObject> selectedProperties, List<ServicesRegistry> res) {
StringBuffer buff = new StringBuffer();
Iterator<EObject> selectedIter = selectedProperties.iterator();
Iterator<ServicesRegistry> registryIter = res.iterator();
while(selectedIter.hasNext()) {
EObject selected = selectedIter.next();
ServicesRegistry registry = registryIter.next();
buff.append("\n[ServicesRegistry]\n");
if( registry != null )
buff.append(registry.toString());
else
buff.append("Registry not found !!!");
buff.append( "\n[EOBject]\n");
buff.append(selected.toString());
buff.append("\n");
}
String message = buff.toString();
MessageDialog.openInformation(shell, "ServicesRegistry found for selected objects:", message);
}
/**
* Get all selected element of the specified type.
*
* @param expectedType
* @return
* @throws ExecutionException
*/
@SuppressWarnings("unchecked")
private <T> List<T> getAllSelectionAdaptedToType(ExecutionEvent event, Class<T> expectedType) throws ExecutionException {
// Get selection from the workbench
ISelection selection = HandlerUtil.getCurrentSelectionChecked(event);
// Get the selected objects according to the type of the selected
if(selection instanceof IStructuredSelection)
{
IStructuredSelection structuredSelection = (IStructuredSelection)selection;
return getAllElementAdaptedToType( structuredSelection.toList(), expectedType);
}
else if( selection instanceof TreeSelection) {
TreeSelection treeSelection = (TreeSelection)selection;
return getAllElementAdaptedToType( treeSelection.toList(), expectedType );
}
return null;
}
/**
* Filter the list, and only retain objects that can be adapted to the specified type
* @param objects
* @param class1
* @return
*/
private <T> List<T> getAllElementAdaptedToType(List<Object> list, Class<T> expectedClassType) {
List<T> res = new ArrayList<T>();
for( Object cur : list) {
T adapted = adapt( cur, expectedClassType);
if( adapted != null)
res.add(adapted);
}
return res;
}
/**
* Adapt the specified object to the requested type, if possible.
* Return null if the object can't be adapted.
*
* @param object
* @param expectedClassType
* @return The adapted object, or null.
*/
@SuppressWarnings("unchecked")
private <T> T adapt( Object object, Class<T> expectedClassType) {
if( object instanceof IAdaptable ) {
T ele = (T)((IAdaptable)object).getAdapter(expectedClassType);
if(ele != null) {
return ele;
}
// Try as EObject if the expectedClasType is sub-type of EObject.
if( EObject.class.isAssignableFrom( expectedClassType) ) {
// to EObject
EObject eobject = (EObject)((IAdaptable)object).getAdapter(EObject.class);
if(eobject != null && expectedClassType.isInstance(eobject)) {
return (T)eobject;
}
}
}
// Try global mechanism
{
T ele = (T)Platform.getAdapterManager().getAdapter(object, expectedClassType);
if(ele != null) {
return ele;
}
// Try as EObject if the expectedClasType is sub-type of EObject.
if( EObject.class.isAssignableFrom( expectedClassType) ) {
// to EObject
EObject eobject = (EObject)Platform.getAdapterManager().getAdapter(object, EObject.class);
if(eobject != null && expectedClassType.isInstance(eobject)) {
return (T)eobject;
}
}
}
// Can't be adapted
return null;
}
/**
*
* @param event
* @param errorMessage
* @throws ExecutionException
*/
private void showErrorDialog(ExecutionEvent event, String title, String errorMessage) throws ExecutionException {
IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);
MessageDialog.openError(
window.getShell(),
title,
errorMessage);
}
/**
* Get the name used in the {@link RecordingCommand}. This name will be visible in
* undo/redo.
*
* @return The command name to show.
*/
public String getCommandName() {
return "Show ServiceRegistry";
}
}
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