bundles/rcp/org.eclipse.apogy.rcp/src/org/eclipse/apogy/rcp/E4LifeCycle.java

/*******************************************************************************
 * Copyright (c) 2018 Agence spatiale canadienne / Canadian Space Agency 
 * 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:
 *     Pierre Allard,
 *     Regent L'Archeveque,
 *     Sebastien Gemme - initial API and implementation
 *
 * SPDX-License-Identifier: EPL-1.0
 *******************************************************************************/
package org.eclipse.apogy.rcp;

import org.eclipse.apogy.common.emf.transaction.ApogyCommonTransactionFacade;
import org.eclipse.apogy.workspace.ApogyWorkspaceFacade;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.ui.workbench.UIEvents;
import org.eclipse.e4.ui.workbench.lifecycle.PostContextCreate;
import org.eclipse.e4.ui.workbench.lifecycle.PreSave;
import org.eclipse.e4.ui.workbench.lifecycle.ProcessAdditions;
import org.eclipse.e4.ui.workbench.lifecycle.ProcessRemovals;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.transaction.ResourceSetChangeEvent;
import org.eclipse.emf.transaction.ResourceSetListener;
import org.eclipse.emf.transaction.ResourceSetListenerImpl;

/**
 * This is a stub implementation containing e4 LifeCycle annotated
 * methods.<br />
 * There is a corresponding entry in <em>plugin.xml</em> (under the
 * <em>org.eclipse.core.runtime.products' extension point</em>) that references
 * this class.
 **/
public class E4LifeCycle {

	private ResourceSetListener resourceSetListener;
	private IEclipseContext workbenchContext;
	private AdapterImpl workspaceAdapter;

	@PostContextCreate
	void postContextCreate(IEclipseContext workbenchContext) {
		this.workbenchContext = workbenchContext;
		ApogyCommonTransactionFacade.INSTANCE.getDefaultEditingDomain()
				.addResourceSetListener(getResourceSetListener());
		ApogyWorkspaceFacade.INSTANCE.eAdapters().add(getWorkspaceAdapter());
	}

	@PreSave
	void preSave(IEclipseContext workbenchContext) {
	}

	@ProcessAdditions
	void processAdditions(IEclipseContext workbenchContext) {
	}

	@ProcessRemovals
	void processRemovals(IEclipseContext workbenchContext) {
	}

	private ResourceSetListener getResourceSetListener() {
		if (this.resourceSetListener == null) {
			this.resourceSetListener = new ResourceSetListenerImpl() {
				@Override
				public void resourceSetChanged(ResourceSetChangeEvent event) {
					processEvent();
				}
			};
		}
		return this.resourceSetListener;
	}

	private void processEvent() {
		IEventBroker eventBroker = (IEventBroker) this.workbenchContext.get(IEventBroker.class.getName());
		if (eventBroker != null) {
			eventBroker.send(UIEvents.REQUEST_ENABLEMENT_UPDATE_TOPIC, UIEvents.ALL_ELEMENT_ID);
		}
	}

	private Adapter getWorkspaceAdapter() {
		if (this.workspaceAdapter == null) {
			this.workspaceAdapter = new AdapterImpl() {
				@Override
				public void notifyChanged(Notification msg) {
					processEvent();
				}
			};
		}
		return this.workspaceAdapter;
	}
}