| /* |
| * Copyright 2004,2004 The Apache Software Foundation. |
| * |
| * Licensed 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.bsf.util; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.util.Hashtable; |
| |
| /** |
| * This class loader knows to load a class from the tempDir dir |
| * of the environment of the given manager. |
| * |
| * @author Sanjiva Weerawarana |
| */ |
| class BSFClassLoader extends ClassLoader { |
| Hashtable cache = new Hashtable (); |
| String tempDir = "."; |
| |
| // note the non-public constructor - this is only avail within |
| // this package. |
| BSFClassLoader () { |
| } |
| public synchronized Class loadClass (String name, boolean resolve) |
| throws ClassNotFoundException { |
| Class c = (Class) cache.get (name); |
| if (c == null) { |
| // is it a system class |
| try { |
| c = findSystemClass (name); |
| cache.put (name, c); |
| return c; |
| } catch (ClassNotFoundException e) { |
| // nope |
| } |
| try { |
| byte[] data = loadClassData (name); |
| c = defineClass (name, data, 0, data.length); |
| cache.put (name, c); |
| } catch (Exception e) { |
| e.printStackTrace (); |
| throw new ClassNotFoundException ("unable to resolve class '" + |
| name + "'"); |
| } |
| } |
| if (resolve) |
| resolveClass (c); |
| return c; |
| } |
| private byte[] loadClassData (String name) throws Exception { |
| String fileName = tempDir + File.separatorChar + name + ".class"; |
| FileInputStream fi = new FileInputStream (fileName); |
| byte[] data = new byte[fi.available ()]; |
| fi.read (data); |
| fi.close(); |
| return data; |
| } |
| public void setTempDir (String tempDir) { |
| this.tempDir = tempDir; |
| } |
| } |