| /* |
| * 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.scr.impl.inject.internal; |
| |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| |
| import org.apache.felix.scr.impl.logger.ComponentLogger; |
| import org.apache.felix.scr.impl.logger.InternalLogger.Level; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceReference; |
| import org.osgi.service.component.ComponentContext; |
| import org.osgi.service.component.ComponentServiceObjects; |
| import org.osgi.service.packageadmin.ExportedPackage; |
| import org.osgi.service.packageadmin.PackageAdmin; |
| import org.osgi.util.tracker.ServiceTracker; |
| |
| |
| /** |
| * Utility methods for class handling used by method and field references. |
| */ |
| @SuppressWarnings("deprecation") |
| public class ClassUtils |
| { |
| |
| // name of the PackageAdmin class (this is a string to not create a reference to the class) |
| private static final String PACKAGEADMIN_CLASS = "org.osgi.service.packageadmin.PackageAdmin"; |
| |
| private static final Class<?> OBJECT_CLASS = Object.class; |
| |
| public static final Class<?> SERVICE_REFERENCE_CLASS = ServiceReference.class; |
| |
| public static final Class<?> COMPONENTS_SERVICE_OBJECTS_CLASS = ComponentServiceObjects.class; |
| |
| public static final Class<?> MAP_CLASS = Map.class; |
| public static final Class<?> MAP_ENTRY_CLASS = Map.Entry.class; |
| |
| public static final Class<?> COLLECTION_CLASS = Collection.class; |
| public static final Class<?> LIST_CLASS = List.class; |
| |
| public static final Class<?> OPTIONAL_CLASS = Optional.class; |
| |
| public static final Class<?> COMPONENT_CONTEXT_CLASS = ComponentContext.class; |
| public static final Class<?> BUNDLE_CONTEXT_CLASS = BundleContext.class; |
| public static final Class<?> INTEGER_CLASS = Integer.class; |
| |
| public static final String LOGGER_CLASS = "org.osgi.service.log.Logger"; |
| public static final String FORMATTER_LOGGER_CLASS = "org.osgi.service.log.FormatterLogger"; |
| public static final String LOGGER_FACTORY_CLASS = "org.osgi.service.log.LoggerFactory"; |
| |
| |
| // this bundle's context |
| private static BundleContext m_context; |
| // the package admin service (see BindMethod.getParameterClass) |
| public static volatile ServiceTracker<?, ?> m_packageAdmin; |
| |
| /** |
| * Returns the class object representing the class of the field reference |
| * The class loader of the component class is used to load the service class. |
| * <p> |
| * It may well be possible, that the class loader of the target class cannot |
| * see the service object class, for example if the service reference is |
| * inherited from a component class of another bundle. |
| * |
| * @return The class object for the referred to service or <code>null</code> |
| * if the class loader of the <code>targetClass</code> cannot see that |
| * class. |
| */ |
| public static Class<?> getClassFromComponentClassLoader( |
| final Class<?> componentClass, |
| final String className, |
| final ComponentLogger logger ) |
| { |
| if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log( |
| Level.DEBUG, |
| "getReferenceClass: Looking for interface class {0} through loader of {1}", null, |
| className, componentClass.getName() ); |
| } |
| |
| try |
| { |
| // need the class loader of the target class, which may be the |
| // system classloader, which case getClassLoader may retur null |
| ClassLoader loader = componentClass.getClassLoader(); |
| if ( loader == null ) |
| { |
| loader = ClassLoader.getSystemClassLoader(); |
| } |
| |
| final Class<?> referenceClass = loader.loadClass( className ); |
| if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log(Level.DEBUG, |
| "getParameterClass: Found class {0}", null, referenceClass.getName() ); |
| } |
| return referenceClass; |
| } |
| catch ( final ClassNotFoundException cnfe ) |
| { |
| // if we can't load the class, perhaps the method is declared in a |
| // super class so we try this class next |
| } |
| |
| if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log(Level.DEBUG, |
| "getParameterClass: Not found through component class, using PackageAdmin service", null ); |
| } |
| |
| // try to load the class with the help of the PackageAdmin service |
| PackageAdmin pa = ( PackageAdmin ) getPackageAdmin(); |
| if ( pa != null ) |
| { |
| final String referenceClassPackage = className.substring( 0, className |
| .lastIndexOf( '.' ) ); |
| ExportedPackage[] pkg = pa.getExportedPackages( referenceClassPackage ); |
| if ( pkg != null ) |
| { |
| for ( int i = 0; i < pkg.length; i++ ) |
| { |
| try |
| { |
| if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log( |
| Level.DEBUG, |
| "getParameterClass: Checking Bundle {0}/{1}", |
| null, pkg[i].getExportingBundle().getSymbolicName(), pkg[i].getExportingBundle().getBundleId() ); |
| } |
| |
| Class<?> referenceClass = pkg[i].getExportingBundle().loadClass( className ); |
| if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log(Level.DEBUG, |
| "getParameterClass: Found class {0}", null,referenceClass.getName() ); |
| } |
| return referenceClass; |
| } |
| catch ( ClassNotFoundException cnfe ) |
| { |
| // exported package does not provide the interface !!!! |
| } |
| } |
| } |
| else if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log(Level.DEBUG, |
| "getParameterClass: No bundles exporting package {0} found", null, referenceClassPackage ); |
| } |
| } |
| else if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log(Level.DEBUG, |
| "getParameterClass: PackageAdmin service not available, cannot find class", null ); |
| } |
| |
| // class cannot be found, neither through the component nor from an |
| // export, so we fall back to assuming Object |
| if (logger.isLogEnabled(Level.DEBUG)) |
| { |
| logger.log(Level.DEBUG, |
| "getParameterClass: No class found, falling back to class Object", null ); |
| } |
| return OBJECT_CLASS; |
| } |
| |
| public static void setBundleContext( BundleContext bundleContext ) |
| { |
| ClassUtils.m_context = bundleContext; |
| } |
| |
| public static Object getPackageAdmin() |
| { |
| if (m_packageAdmin == null) |
| { |
| synchronized (ClassUtils.class) |
| { |
| if (m_packageAdmin == null) |
| { |
| m_packageAdmin = new ServiceTracker<>(m_context, PACKAGEADMIN_CLASS, |
| null); |
| m_packageAdmin.open(); |
| } |
| } |
| } |
| |
| return m_packageAdmin.getService(); |
| } |
| |
| public static void close() |
| { |
| // close the PackageAdmin tracker now |
| if (m_packageAdmin != null) |
| { |
| m_packageAdmin.close(); |
| m_packageAdmin = null; |
| } |
| |
| // remove the reference to the component context |
| m_context = null; |
| } |
| |
| /** |
| * Returns the name of the package to which the class belongs or an |
| * empty string if the class is in the default package. |
| */ |
| public static String getPackageName( final Class<?> clazz ) |
| { |
| String name = clazz.getName(); |
| int dot = name.lastIndexOf( '.' ); |
| return ( dot > 0 ) ? name.substring( 0, dot ) : ""; |
| } |
| |
| } |