| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.felix.das.util; |
| |
| |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Dictionary; |
| import java.util.List; |
| |
| import org.apache.felix.das.DriverAttributes; |
| import org.apache.felix.das.Log; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.BundleException; |
| import org.osgi.framework.ServiceReference; |
| import org.osgi.service.device.Constants; |
| import org.osgi.service.device.DriverLocator; |
| |
| |
| /** |
| * TODO: add javadoc |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class DriverLoader |
| { |
| |
| private final BundleContext m_context; |
| |
| private final Log m_log; |
| |
| public final static String DRIVER_LOCATION_PREFIX = "_DD_"; |
| |
| /** |
| * to keep track of all loaded drivers |
| */ |
| private final List<ServiceReference> m_loadedDrivers; |
| |
| |
| public DriverLoader( Log log, BundleContext context ) |
| { |
| m_log = log; |
| m_context = context; |
| m_loadedDrivers = new ArrayList<ServiceReference>(); |
| } |
| |
| |
| @SuppressWarnings("all") |
| public List<String> findDrivers( Collection<DriverLocator> locators, Dictionary dict ) |
| { |
| final List<String> list = new ArrayList<String>(); |
| for ( DriverLocator locator : locators ) |
| { |
| list.addAll( findDrivers( locator, dict ) ); |
| } |
| |
| return list; |
| } |
| |
| |
| @SuppressWarnings("all") |
| private List<String> findDrivers( DriverLocator locator, Dictionary dict ) |
| { |
| final List<String> list = new ArrayList<String>(); |
| try |
| { |
| String[] ids = locator.findDrivers( dict ); |
| if ( ids != null ) |
| { |
| list.addAll( Arrays.asList( ids ) ); |
| } |
| } |
| catch ( Exception e ) |
| { |
| // ignore, will also frequently happen (?) |
| // m_log.error("findDrivers failed for: " + locator, e); |
| } |
| |
| return list; |
| } |
| |
| |
| /** |
| * load all drivers that belong to the given driver Ids |
| * |
| * @param locator |
| * @param driverIds |
| */ |
| public List<ServiceReference> loadDrivers( List<DriverLocator> locators, String[] driverIds ) |
| { |
| List<ServiceReference> driverRefs = new ArrayList<ServiceReference>(); |
| |
| for ( String driverId : driverIds ) |
| { |
| driverRefs.addAll( loadDriver( locators, driverId ) ); |
| } |
| |
| return driverRefs; |
| } |
| |
| |
| private List<ServiceReference> loadDriver( List<DriverLocator> locators, String driverId ) |
| { |
| List<ServiceReference> driverRefs = new ArrayList<ServiceReference>(); |
| |
| for ( DriverLocator driverLocator : locators ) |
| { |
| List<ServiceReference> drivers = loadDriver( driverLocator, driverId ); |
| driverRefs.addAll( drivers ); |
| if ( drivers.size() > 0 ) |
| { |
| break; |
| } |
| } |
| |
| return driverRefs; |
| } |
| |
| |
| private List<ServiceReference> loadDriver( DriverLocator locator, String driverId ) |
| { |
| List<ServiceReference> driverRefs = new ArrayList<ServiceReference>(); |
| try |
| { |
| InputStream in = locator.loadDriver( driverId ); |
| // System.out.println(driverId + ", " + locator + " returned: " + |
| // in); |
| Bundle driverBundle = m_context.installBundle( DRIVER_LOCATION_PREFIX + driverId, in ); |
| |
| driverBundle.start(); |
| |
| ServiceReference[] refs = driverBundle.getRegisteredServices(); |
| |
| driverRefs.addAll( Arrays.asList( refs ) ); |
| // keep track of them locally |
| m_loadedDrivers.addAll( Arrays.asList( refs ) ); |
| |
| } |
| catch ( Throwable t ) |
| { |
| // ignore, this will happen frequently, if there are multiple |
| // locators |
| } |
| return driverRefs; |
| } |
| |
| |
| public void unload( DriverAttributes finalDriver ) |
| { |
| |
| ServiceReference finalRef = null; |
| if ( finalDriver != null ) |
| { |
| finalRef = finalDriver.getReference(); |
| m_log.debug( "unloading all except: " + finalRef.getProperty( Constants.DRIVER_ID ) ); |
| } |
| for ( ServiceReference ref : m_loadedDrivers ) |
| { |
| if ( !ref.equals( finalRef ) ) |
| { |
| try |
| { |
| m_log.debug( "uninstalling: " + ref.getProperty( Constants.DRIVER_ID ) ); |
| ref.getBundle().uninstall(); |
| } |
| catch ( BundleException e ) |
| { |
| m_log.warning( "unable to uninstall: " + ref.getProperty( Constants.DRIVER_ID ) ); |
| } |
| } |
| } |
| } |
| } |