| /* |
| * 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.loaders.java; |
| |
| import org.apache.myfaces.extensions.scripting.core.util.ClassUtils; |
| import org.apache.myfaces.extensions.scripting.core.util.WeavingContext; |
| import org.apache.myfaces.extensions.scripting.monitor.ClassResource; |
| import org.apache.myfaces.extensions.scripting.monitor.RefreshAttribute; |
| import org.apache.myfaces.extensions.scripting.monitor.RefreshContext; |
| |
| import java.io.*; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * A specialized non tainting classloader for our scanners |
| */ |
| @SuppressWarnings("unused") |
| public class ScannerClassloader extends ClassLoader { |
| |
| File _tempDir = null; |
| |
| Map<String, Class> _alreadyScanned = new HashMap<String, Class>(); |
| |
| final Logger _logger = Logger.getLogger(ScannerClassloader.class.getName()); |
| |
| |
| public ScannerClassloader(ClassLoader classLoader, int scriptingEngine, String engineExtension, File tempDir) { |
| super(classLoader); |
| |
| this._tempDir = tempDir; |
| } |
| |
| @Override |
| public InputStream getResourceAsStream(String name) { |
| File resource = new File(_tempDir.getAbsolutePath() + File.separator + name); |
| if (resource.exists()) { |
| try { |
| return new FileInputStream(resource); |
| } catch (FileNotFoundException e) { |
| return super.getResourceAsStream(name); |
| } |
| } |
| return super.getResourceAsStream(name); |
| } |
| |
| public File getClassFile(String className) { |
| return ClassUtils.classNameToFile(_tempDir.getAbsolutePath(), className); |
| } |
| |
| @Override |
| public Class<?> loadClass(String className) throws ClassNotFoundException { |
| //check if our class exists in the tempDir |
| |
| if (_alreadyScanned.containsKey(className)) { |
| return _alreadyScanned.get(className); |
| } |
| |
| File target = getClassFile(className); |
| if (!target.exists()) { |
| return super.loadClass(className); |
| } |
| |
| ClassResource data = WeavingContext.getFileChangedDaemon().getClassMap().get(className); |
| if (data != null && !data.getRefreshAttribute().requiresRefresh()) { |
| return data.getAClass(); |
| } |
| |
| FileInputStream iStream = null; |
| |
| int fileLength; |
| byte[] fileContent; |
| try { |
| //we cannot load while a compile is in progress |
| //we have to wait until it is one |
| synchronized (RefreshContext.COMPILE_SYNC_MONITOR) { |
| fileLength = (int) target.length(); |
| fileContent = new byte[fileLength]; |
| iStream = new FileInputStream(target); |
| int len = iStream.read(fileContent); |
| if (_logger.isLoggable(Level.FINER)) { |
| _logger.log(Level.FINER, "class read {0}� bytes read", String.valueOf(len)); |
| } |
| } |
| |
| //we have to do it here because just in case |
| //a dependent class is loaded as well we run into classcast exceptions |
| Class retVal = super.defineClass(className, fileContent, 0, fileLength); |
| _alreadyScanned.put(className, retVal); |
| return retVal; |
| |
| } catch (FileNotFoundException e) { |
| throw new ClassNotFoundException(e.toString()); |
| } catch (IOException e) { |
| throw new ClassNotFoundException(e.toString()); |
| } finally { |
| if (iStream != null) { |
| try { |
| iStream.close(); |
| } catch (Exception e) { |
| _logger.log(Level.SEVERE, "", e); |
| } |
| } |
| } |
| |
| } |
| |
| } |
| |