| /* |
| * 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.myfaces.extensions.scripting.core.dependencyScan; |
| |
| import org.apache.myfaces.extensions.scripting.core.dependencyScan.api.DependencyRegistry; |
| import org.apache.myfaces.extensions.scripting.core.dependencyScan.api.DependencyScanner; |
| import org.apache.myfaces.extensions.scripting.core.dependencyScan.core.ClassScanUtils; |
| import org.apache.myfaces.extensions.scripting.core.dependencyScan.core.ClassScanVisitor; |
| import org.apache.myfaces.extensions.scripting.core.dependencyScan.core.ExtendedClassReader; |
| import org.objectweb.asm.ClassReader; |
| |
| import java.io.IOException; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * A dependency scanner for |
| * our classes. This class is thread save on object level |
| * and can be used as a singleton |
| * <p/> |
| * |
| * @author Werner Punz (latest modification by $Author$) |
| * @version $Revision$ $Date$ |
| */ |
| public class StandardDependencyScanner implements DependencyScanner { |
| final ClassScanVisitor _cp = new ClassScanVisitor(); |
| Logger _logger = Logger.getLogger(this.getClass().getName()); |
| |
| public StandardDependencyScanner() { |
| |
| } |
| |
| public synchronized final void fetchDependencies(ClassLoader loader, Integer engineType, String className, DependencyRegistry registry) { |
| _cp.setEngineType(engineType); |
| _cp.setRootClass(className); |
| _cp.setDependencyRegistry(registry); |
| investigateInheritanceHierarchy(loader, className); |
| registry.flush(engineType); |
| } |
| |
| /** |
| * this investigates the classes inheritance hierarchy for |
| * more dependencies, for now annotations and interfaces |
| * are omitted since they are not vital to our jsf dependency checks |
| * (maybe in the long run we will add interfaces and annotations as well |
| * but for now we will leave them away for speed reasons) |
| * |
| * @param loader the classLoader which should be used for the hierarchy scanning |
| * @param className the className which has to be investigated |
| */ |
| private void investigateInheritanceHierarchy(ClassLoader loader, String className) { |
| //we now have to fetch the parent hierarchy |
| |
| try { |
| Class toCheck = loader.loadClass(className); |
| if (toCheck == null) { |
| return; |
| } |
| scanCurrentClass(loader, className); |
| |
| //we scan the hierarchy because we might have compiled-uncompiled-compiled connections, the same goes for the interfaces |
| //the basic stuff can be covered by our class scanning but for more advanced usecase we have to walk the entire hierarchy per class! |
| scanHierarchy(loader, toCheck); |
| //our asm code normally covers this but since the scanner has to work outside of asm we do it twice, the same goes for the hierarchy |
| scanInterfaces(loader, toCheck); |
| } catch (ClassNotFoundException e) { |
| _logger.log(Level.SEVERE, "DefaultDependencyScanner.investigateInheritanceHierarchy() ", e); |
| } |
| } |
| |
| private void scanInterfaces(ClassLoader loader, Class toCheck) { |
| Class[] interfaces = toCheck.getInterfaces(); |
| if (interfaces == null || interfaces.length == 0) { |
| return; |
| } |
| |
| for (Class currentInterface : interfaces) { |
| if (ClassScanUtils.isStandardNamespace(currentInterface.getName())) { |
| continue; |
| } |
| scanCurrentClass(loader, currentInterface.getName()); |
| |
| //We scan also our parent interfaces to get a full coverage |
| //but since interfaces do not implement anything we can cover |
| //the parents |
| scanHierarchy(loader, currentInterface); |
| } |
| } |
| |
| /** |
| * scans the parent child relationship hierarchy |
| * We have to go through the entire hierarchy except for standard |
| * namespaces due to the fact that we have to cover source <->binary<->source |
| * dependencies with binary being binary classes never to be refreshed |
| * <p/> |
| * Note we can optionally do some interface checks here |
| * for now annotations are only processed by the class scanner itself |
| * so we do not process any annotation inheritance on this level |
| * we will add the feature later |
| * |
| * @param loader the infrastructural classloader |
| * @param toCheck the class which needs to be checked |
| */ |
| private void scanHierarchy(ClassLoader loader, Class toCheck) { |
| Class parent = toCheck.getSuperclass(); |
| |
| while (parent != null && !ClassScanUtils.isStandardNamespace(parent.getName())) { |
| scanCurrentClass(loader, parent.getName()); |
| parent = parent.getSuperclass(); |
| } |
| } |
| |
| /** |
| * scans one level of the inheritance hierarchy |
| * |
| * @param loader the classLoader which should be used for the hierarchy scanning |
| * @param currentClassName the className which has to be investigated |
| */ |
| private void scanCurrentClass(ClassLoader loader, String currentClassName) { |
| ClassReader cr; |
| try { |
| cr = new ExtendedClassReader(loader, currentClassName); |
| cr.accept(_cp, 0); |
| } catch (IOException e) { |
| _logger.log(Level.SEVERE, "scanCurrentClass() ", e); |
| } |
| } |
| |
| } |