| /****************************************************************************** |
| * Copyright (c) 2007 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| ****************************************************************************/ |
| |
| package org.eclipse.gmf.runtime.diagram.core.services; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.emf.transaction.TransactionalEditingDomain; |
| import org.eclipse.gmf.runtime.common.core.service.ExecutionStrategy; |
| import org.eclipse.gmf.runtime.common.core.service.IOperation; |
| import org.eclipse.gmf.runtime.common.core.service.Service; |
| import org.eclipse.gmf.runtime.diagram.core.internal.DiagramPlugin; |
| import org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker; |
| import org.eclipse.gmf.runtime.diagram.core.providers.DiagramEventBrokerProvider; |
| import org.eclipse.gmf.runtime.diagram.core.services.eventbroker.CreateDiagramEventBrokerOperation; |
| import org.eclipse.gmf.runtime.diagram.core.services.view.CreateViewOperation; |
| |
| /** |
| * A service for manipulating Diagram Event broker creations |
| * |
| * @author mmostafa |
| */ |
| public class DiagramEventBrokerService |
| extends Service |
| implements DiagramEventBrokerProvider { |
| |
| /** |
| * The singleton instance of the Diagram Event Broker Factory service. |
| */ |
| private final static DiagramEventBrokerService instance = new DiagramEventBrokerService(); |
| |
| static { |
| instance.configureProviders(DiagramPlugin.getPluginId(), |
| "diagramEventBrokerProviders"); //$NON-NLS-1$ |
| } |
| |
| /** |
| * Retrieves the singleton instance of the diagram Event Broker Factory |
| * service |
| * |
| * @return The diagram Event Broker Factory service singleton. |
| */ |
| public static DiagramEventBrokerService getInstance() { |
| return instance; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.gmf.runtime.diagram.core.providers.DiagramEventBrokerFactory#createDiagramEventBroker(org.eclipse.emf.transaction.TransactionalEditingDomain) |
| */ |
| public final DiagramEventBroker createDiagramEventBroker( |
| TransactionalEditingDomain editingDomain) { |
| return (DiagramEventBroker) executeUnique(ExecutionStrategy.FIRST, |
| new CreateDiagramEventBrokerOperation(editingDomain)); |
| } |
| |
| protected static class ProviderDescriptor |
| extends Service.ProviderDescriptor { |
| |
| private IConfigurationElement element; |
| |
| public ProviderDescriptor(IConfigurationElement element) { |
| super(element); |
| this.element = element; |
| } |
| |
| /** |
| * @see org.eclipse.gmf.runtime.common.core.service.IProvider#provides(org.eclipse.gmf.runtime.common.core.service.IOperation) |
| */ |
| public boolean provides(IOperation operation) { |
| if (!policyInitialized) { |
| policy = getPolicy(); |
| policyInitialized = true; |
| } |
| if (policy != null) |
| return policy.provides(operation); |
| if (provider == null) { |
| if (isSupportedInExtention(operation)) { |
| return getProvider().provides(operation); |
| } |
| return false; |
| } |
| return getProvider().provides(operation); |
| } |
| |
| private boolean isSupportedInExtention(IOperation operation) { |
| IConfigurationElement[] ids = element.getChildren("editingDomain");//$NON-NLS-1$ |
| if (null == ids || ids.length == 0) |
| return false; |
| String id = ((CreateDiagramEventBrokerOperation) operation) |
| .getEditingDomain().getID(); |
| if (null == id) |
| return false; |
| for (int i = 0; i < ids.length; i++) { |
| if (id.equals(ids[i].getAttribute("ID")))//$NON-NLS-1$ |
| return true; |
| } |
| return false; |
| } |
| } |
| |
| /** |
| * @see org.eclipse.gmf.runtime.common.core.service.Service#newProviderDescriptor(org.eclipse.core.runtime.IConfigurationElement) |
| */ |
| protected Service.ProviderDescriptor newProviderDescriptor( |
| IConfigurationElement _element) { |
| return new ProviderDescriptor(_element); |
| } |
| |
| /** |
| * @see org.eclipse.gmf.runtime.common.core.service.Service#createPriorityCache() |
| */ |
| protected Map createPriorityCache() { |
| return new HashMap(); |
| } |
| |
| /** |
| * @see org.eclipse.gmf.runtime.common.core.service.Service#getCacheKey(org.eclipse.gmf.runtime.common.core.service.IOperation) |
| */ |
| protected Object getCachingKey(IOperation operation) { |
| return ((CreateViewOperation) operation).getCachingKey(); |
| } |
| } |