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/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.ui.internal.util.PrefUtil;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The plug-in class for the org.eclipse.ui plug-in.
 * This class is internal to the workbench and should not be
 * referenced by clients.
 */
public final class UIPlugin extends AbstractUIPlugin {

	private static UIPlugin inst;

	/**
	 * Creates an instance of the UIPlugin.
	 *
	 * @since 3.0
	 */
	public UIPlugin() {
		super();
		inst = this;
	}

	/**
	 * Returns the image registry for this plugin.
	 *
	 * Where are the images? The images (typically png) are found in the same
	 * plugins directory.
	 *
	 * Note: The workbench uses the standard JFace ImageRegistry to track its
	 * images. In addition the class WorkbenchGraphicResources provides
	 * convenience access to the graphics resources and fast field access for
	 * some of the commonly used graphical images.
	 *
	 * @see ImageRegistry
	 */
	@Override
	protected ImageRegistry createImageRegistry() {
		/* Just to be sure that we don't access this
		 * plug-ins image registry.
		 */
		Assert.isLegal(false);
		return null;
	}

	@Override
	public ImageRegistry getImageRegistry() {
		/* Just to be sure that we don't access this
		 * plug-ins image registry.
		 */
		Assert.isLegal(false);
		return null;
	}

	/**
	 * Returns the default instance of the receiver. This represents the runtime plugin.
	 *
	 * @return UIPlugin the singleton instance of the receiver.
	 * @see AbstractUIPlugin for the typical implementation pattern for plugin classes.
	 */
	public static UIPlugin getDefault() {
		return inst;
	}


	@Override
	public void start(BundleContext context) throws Exception {
		super.start(context);

		// set a callback allowing the workbench plugin to obtain
		// and save the UI plugin's preference store
		PrefUtil.setUICallback(new PrefUtil.ICallback() {
			@Override
			public IPreferenceStore getPreferenceStore() {
				return UIPlugin.this.getPreferenceStore();
			}

			@Override
			public void savePreferences() {
				UIPlugin.this.savePluginPreferences();
			}
		});
	}
}