| /* |
| * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package separate; |
| |
| import java.util.HashMap; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| |
| class DirectedClassLoader extends ClassLoader { |
| |
| private HashMap<String,File> loadLocations; |
| private File defaultLocation; |
| private ClassFilePreprocessor[] preprocessors; |
| |
| public DirectedClassLoader( |
| HashMap<String,File> locations, File fallback, |
| ClassFilePreprocessor ... preprocessors) { |
| loadLocations = new HashMap<>(locations); |
| defaultLocation = fallback; |
| this.preprocessors = preprocessors; |
| } |
| |
| public DirectedClassLoader( |
| File fallback, ClassFilePreprocessor ... preprocessors) { |
| loadLocations = new HashMap<>(); |
| defaultLocation = fallback; |
| this.preprocessors = preprocessors; |
| } |
| |
| public DirectedClassLoader(ClassFilePreprocessor ... preprocessors) { |
| this((File)null, preprocessors); |
| } |
| |
| public void setDefaultLocation(File dir) { this.defaultLocation = dir; } |
| public void setLocationFor(String name, File dir) { |
| loadLocations.put(name, dir); |
| } |
| |
| @Override |
| protected Class<?> findClass(String name) { |
| String path = name.replace(".", File.separator) + ".class"; |
| |
| File location = loadLocations.get(name); |
| if (location == null || !(new File(location, path)).exists()) { |
| File def = new File(defaultLocation, path); |
| if (def.exists()) { |
| return defineFrom(name, new File(location, path)); |
| } |
| } else { |
| return defineFrom(name, new File(location, path)); |
| } |
| return null; |
| } |
| |
| private Class<?> defineFrom(String name, File file) { |
| FileInputStream fis = null; |
| try { |
| try { |
| fis = new FileInputStream(file); |
| byte[] bytes = new byte[fis.available()]; |
| int read = fis.read(bytes); |
| if (read != bytes.length) { |
| return null; |
| } |
| if (preprocessors != null) { |
| for (ClassFilePreprocessor cfp : preprocessors) { |
| bytes = cfp.preprocess(name, bytes); |
| } |
| } |
| return defineClass(name, bytes, 0, bytes.length); |
| } finally { |
| fis.close(); |
| } |
| } catch (IOException e) {} |
| return null; |
| } |
| } |