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/*******************************************************************************
* Copyright (c) 2005, 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.core.internal.preferences;
import java.util.Hashtable;
import org.eclipse.core.internal.runtime.RuntimeLog;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.preferences.IPreferencesService;
import org.eclipse.osgi.service.environment.EnvironmentInfo;
import org.osgi.framework.*;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
/**
* The Preferences bundle activator.
*/
public class Activator implements BundleActivator, ServiceTrackerCustomizer {
public static final String PI_PREFERENCES = "org.eclipse.equinox.preferences"; //$NON-NLS-1$
/**
* Eclipse property. Set to <code>false</code> to avoid registering JobManager
* as an OSGi service.
*/
private static final String PROP_REGISTER_PERF_SERVICE = "eclipse.service.pref"; //$NON-NLS-1$
// the system property
private static final String PROP_CUSTOMIZATION = "eclipse.pluginCustomization"; //$NON-NLS-1$
/**
* Track the registry service - only register preference service if the registry is
* available
*/
private ServiceTracker registryServiceTracker;
/**
* The bundle associated this plug-in
*/
private static BundleContext bundleContext;
/**
* This plugin provides a Preferences service.
*/
private ServiceRegistration preferencesService = null;
/**
* This plugin provides the OSGi Preferences service.
*/
private ServiceRegistration osgiPreferencesService = null;
/* (non-Javadoc)
* @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
*/
public void start(BundleContext context) throws Exception {
bundleContext = context;
// Open the services first before processing the command-line args, order is important! (Bug 150288)
PreferencesOSGiUtils.getDefault().openServices();
processCommandLine();
boolean shouldRegister = !"false".equalsIgnoreCase(context.getProperty(PROP_REGISTER_PERF_SERVICE)); //$NON-NLS-1$
if (shouldRegister) {
preferencesService = bundleContext.registerService(IPreferencesService.class.getName(), PreferencesService.getDefault(), new Hashtable());
osgiPreferencesService = bundleContext.registerService(org.osgi.service.prefs.PreferencesService.class.getName(), new OSGiPreferencesServiceManager(bundleContext), null);
}
// use the string for the class name here in case the registry isn't around
registryServiceTracker = new ServiceTracker(bundleContext, "org.eclipse.core.runtime.IExtensionRegistry", this); //$NON-NLS-1$
registryServiceTracker.open();
}
/* (non-Javadoc)
* @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
*/
public void stop(BundleContext context) throws Exception {
PreferencesOSGiUtils.getDefault().closeServices();
if (registryServiceTracker != null) {
registryServiceTracker.close();
registryServiceTracker = null;
}
if (preferencesService != null) {
preferencesService.unregister();
preferencesService = null;
}
if (osgiPreferencesService != null) {
osgiPreferencesService.unregister();
osgiPreferencesService = null;
}
bundleContext = null;
}
static BundleContext getContext() {
return bundleContext;
}
/* (non-Javadoc)
* @see org.osgi.util.tracker.ServiceTrackerCustomizer#addingService(org.osgi.framework.ServiceReference)
*/
public synchronized Object addingService(ServiceReference reference) {
Object service = bundleContext.getService(reference);
// this check is important as it avoids early loading of PreferenceServiceRegistryHelper and allows
// this bundle to operate with out necessarily resolving against the registry
if (service != null) {
try {
Object helper = new PreferenceServiceRegistryHelper(PreferencesService.getDefault(), service);
PreferencesService.getDefault().setRegistryHelper(helper);
} catch (Exception e) {
RuntimeLog.log(new Status(IStatus.ERROR, PI_PREFERENCES, 0, PrefsMessages.noRegistry, e));
} catch (NoClassDefFoundError error) {
// Normally this catch would not be needed since we should never see the
// IExtensionRegistry service without resolving against registry.
// However, the check is very lenient with split packages and this can happen when
// the preferences bundle is already resolved at the time the registry bundle is installed.
// For this case we ignore the error. When refreshed the bundle will be rewired correctly.
// null is returned because we don't want to track this particular service reference.
return null;
}
}
//return the registry service so we track it
return service;
}
/* (non-Javadoc)
* @see org.osgi.util.tracker.ServiceTrackerCustomizer#modifiedService(org.osgi.framework.ServiceReference, java.lang.Object)
*/
public void modifiedService(ServiceReference reference, Object service) {
}
/* (non-Javadoc)
* @see org.osgi.util.tracker.ServiceTrackerCustomizer#removedService(org.osgi.framework.ServiceReference, java.lang.Object)
*/
public synchronized void removedService(ServiceReference reference, Object service) {
PreferencesService.getDefault().setRegistryHelper(null);
bundleContext.ungetService(reference);
}
/**
* Look for the plug-in customization file in the system properties and command-line args.
*/
private void processCommandLine() {
// check the value of the system property first because its quicker.
// if it exists, then set it otherwise look at the command-line arguments.
String value = bundleContext.getProperty(PROP_CUSTOMIZATION);
if (value != null) {
DefaultPreferences.pluginCustomizationFile = value;
return;
}
ServiceTracker environmentTracker = new ServiceTracker(bundleContext, EnvironmentInfo.class.getName(), null);
environmentTracker.open();
EnvironmentInfo environmentInfo = (EnvironmentInfo) environmentTracker.getService();
environmentTracker.close();
if (environmentInfo == null)
return;
String[] args = environmentInfo.getNonFrameworkArgs();
if (args == null || args.length == 0)
return;
for (int i = 0; i < args.length; i++) {
if (args[i].equalsIgnoreCase(IPreferencesConstants.PLUGIN_CUSTOMIZATION)) {
if (args.length > i + 1) // make sure the file name is actually there
DefaultPreferences.pluginCustomizationFile = args[i + 1];
break; // only interested in this one
}
}
}
}
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