bundles/core/org.eclipse.apogy.core.topology.ui/src/org/eclipse/apogy/core/topology/ui/Activator.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,
 *     Olivier L. Larouche - initial API and implementation
 *
 * SPDX-License-Identifier: EPL-1.0
 *******************************************************************************/
package org.eclipse.apogy.core.topology.ui;

import org.eclipse.apogy.common.topology.ui.ApogyCommonTopologyUIFacade;
import org.eclipse.apogy.core.topology.ApogyCoreTopologyFacade;
import org.eclipse.apogy.core.topology.ui.preferences.ApogyTopologyUIPreferencesConstants;
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.jface.preference.PreferenceConverter;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

public class Activator extends AbstractUIPlugin {
	// The plug-in ID
	public static final String ID = "org.eclipse.apogy.core.topology.ui"; //$NON-NLS-1$

	// The shared instance
	private static Activator plugin;

	private static BundleContext context;

	private Adapter adapter;

	/**
	 * The constructor
	 */
	public Activator() {
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.
	 * BundleContext)
	 */
	@Override
	public void start(BundleContext context) throws Exception {
		super.start(context);
		Activator.context = context;
		plugin = this;

		// Force the update of the TopologyPresentationRegistry
		forceTopologyPresentationRegistryUpdate();

		ApogyCoreTopologyFacade.INSTANCE.eAdapters().add(getAdapter());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	@Override
	public void stop(BundleContext context) throws Exception {
		plugin = null;
		Activator.context = null;

		ApogyCoreTopologyFacade.INSTANCE.eAdapters().remove(getAdapter());

		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public static Activator getDefault() {
		return plugin;
	}

	static BundleContext getContext() {
		return context;
	}

	public static RGB getApogySystem3DViewBackgroundColor() {
		return PreferenceConverter.getColor(getDefault().getPreferenceStore(),
				ApogyTopologyUIPreferencesConstants.DEFAULT_APOGY_SYSTEM_VIEW_BACKGROUND_COLOR_ID);
	}

	/**
	 * Forces the update of the TopologyPresentationRegistry.
	 */
	private static void forceTopologyPresentationRegistryUpdate() {
		if (ApogyCoreTopologyFacade.INSTANCE.getApogyTopology() != null) {
			// Forces the creation of the NodePresentation Registry.
			ApogyCommonTopologyUIFacade.INSTANCE
					.createGraphicsContext(ApogyCoreTopologyFacade.INSTANCE.getApogyTopology().getRootNode());
		}
	}

	/**
	 * Returns the adapter used to force the update of the
	 * TopologyPresentationRegistry when the session root node changes.
	 * 
	 * @return The Adapter.
	 */
	private Adapter getAdapter() {
		if (this.adapter == null) {
			this.adapter = new AdapterImpl() {
				@Override
				public void notifyChanged(Notification msg) {
					forceTopologyPresentationRegistryUpdate();
				}
			};
		}
		return this.adapter;
	}
}