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/*****************************************************************************
* Copyright (c) 2010 CEA LIST.
*
* 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:
* Remi Schnekenburger (CEA LIST) remi.schnekenburger@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.properties.runtime.modelhandler;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.w3c.dom.Node;
/**
* Service to retrieve model handlers
*/
public class ModelHandlerService {
/** identifier for the model handler extension point */
public static final String EXTENSION_POINT_ID = "org.eclipse.papyrus.properties.runtime.propertyModelHandler";
/** list of registered model handlers factories descriptors */
protected final List<ModelHandlerFactoryDescriptor> modelHandlerFactoryDescriptors;
/** singleton instance of the service */
protected static ModelHandlerService instance;
/**
* Creates a new ModelHandlerService.
*
* @param modelHandlerFactoryDescriptors
* list of model handler factory descriptors proposed by this service
*/
protected ModelHandlerService(List<ModelHandlerFactoryDescriptor> modelHandlerFactoryDescriptors) {
this.modelHandlerFactoryDescriptors = modelHandlerFactoryDescriptors;
}
/**
* returns the singleton instance of this class
*
* @return the singleton instance of this class
*/
public static synchronized ModelHandlerService getInstance() {
if(instance == null) {
instance = createService();
}
return instance;
}
/**
* Creates the singleton instance of the service
*
* @return the singleton instance of the service
*/
protected static ModelHandlerService createService() {
// read extension points and initialize the factories
// Reading data from plugins
List<ModelHandlerFactoryDescriptor> modelHandlers = new ArrayList<ModelHandlerFactoryDescriptor>();
IConfigurationElement[] configElements = Platform.getExtensionRegistry().getConfigurationElementsFor(EXTENSION_POINT_ID);
for(IConfigurationElement element : configElements) {
ModelHandlerFactoryDescriptor descriptor = new ModelHandlerFactoryDescriptor(element);
modelHandlers.add(descriptor);
}
return new ModelHandlerService(modelHandlers);
}
/**
* Creates and return a model handler, given the configuration node
*
* @param id
* the id of the handler to create
* @param featureNode
* the node configuring the model handler
* @return the create model handler
*/
public Object createModelHandler(String id, Node featureNode) {
// retrieve the model handler factory that has the correct id
for(ModelHandlerFactoryDescriptor descriptor : modelHandlerFactoryDescriptors) {
if(id.equals(descriptor.getId())) {
IPropertyModelHandlerFactory factory = descriptor.getModelHandlerFactory();
if(factory != null) {
return factory.createModelHandler(featureNode);
} else {
// descriptor already send a message, no need to send there one more.
}
}
}
return null;
}
}
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