Copyright (c) 2005, 2019 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
    Christoph Läubrich - remove reference to InternalPlatform.getDefault().log
/*******************************************************************************
 *  Copyright (c) 2005, 2019 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
 *     Christoph Läubrich - remove reference to InternalPlatform.getDefault().log
 *******************************************************************************/
package org.eclipse.core.internal.preferences.legacy;

import java.lang.reflect.Field;
import org.eclipse.core.internal.preferences.exchange.ILegacyPreferences;
import org.eclipse.core.internal.runtime.*;
import org.eclipse.core.runtime.*;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;

Provides initialization of the legacy preferences as described in
the Plugin class.
/**
 * Provides initialization of the legacy preferences as described in
 * the Plugin class.
 */
public class InitLegacyPreferences implements ILegacyPreferences {
	
The method tries to initialize the preferences using the legacy Plugin method.
Params:
object – - plugin to initialize
name – - ID of the plugin to be initialized
See Also:
Plugin.initializeDefaultPluginPreferences
Since:
org.eclipse.core.runtime 3.2
Deprecated:
Marked deprecated to suppress warnings. This class is added to support
backward compatibility only and should not be used in any new code./**
	 * The method tries to initialize the preferences using the legacy Plugin method.
	 *
	 * @param object - plugin to initialize
	 * @param name - ID of the plugin to be initialized
	 *
	 * @see Plugin#initializeDefaultPluginPreferences
	 *
	 * @since org.eclipse.core.runtime 3.2
	 *
	 * @deprecated Marked deprecated to suppress warnings. This class is added to support
	 * backward compatibility only and should not be used in any new code.
	 */
	@Override
	@Deprecated
	public Object init(Object object, String name) {
		Plugin plugin = null;
		if (object instanceof Plugin)
			plugin = (Plugin) object;
		else {
			plugin = getActivator(name);
			if (plugin == null) {
				if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
					InternalPlatform.message("No plug-in object available to set plug-in default preference overrides for:" + name); //$NON-NLS-1$
				return null;
			}
		}

		if (InternalPlatform.DEBUG_PLUGIN_PREFERENCES)
			InternalPlatform.message("Applying plug-in default preference overrides for plug-in: " + plugin.getBundle().getBundleId()); //$NON-NLS-1$

		plugin.internalInitializeDefaultPluginPreferences();
		return plugin;
	}

	private Plugin getActivator(String name) {
		Bundle bundle = InternalPlatform.getDefault().getBundle(name);
		if (bundle == null)
			return null;

		BundleContext context = bundle.getBundleContext();
		if (context == null)
			return null;

		/*
		 * Reflection is required since there is no OSGi API to retrieve the
		 * activator. Originally Platform.getPlugin(String) was used, but that
		 * is no longer available after removing the runtine.compatiblity layer.
		 */
		try {
			Field field = context.getClass().getDeclaredField("activator"); //$NON-NLS-1$
			field.setAccessible(true);
			Object activator = field.get(context);
			if (activator instanceof Plugin)
				return (Plugin) activator;
		} catch (SecurityException | NoSuchFieldException | IllegalArgumentException | IllegalAccessException ex) {
			log(ex, name);
		}

		return null;
	}

	private static void log(Exception ex, String name) {
		IStatus status = new Status(IStatus.ERROR, Platform.PI_RUNTIME, IStatus.ERROR, NLS.bind(Messages.plugin_unableToGetActivator, name), ex);
		RuntimeLog.log(status);
	}

}