| /* |
| * Copyright (c) 2003, 2018, 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 nsk.share; |
| |
| import java.io.*; |
| |
| /** |
| * The <code>CustomClassLoader</code> class is used in <code>ClassUnloader</code>. |
| * |
| * <p>This class loader can load classes and notify <code>ClassUnloader</code> |
| * about own finalization to make sure that all loaded classes have been unloaded. |
| * |
| * <p>By default this class loader loads class from .class file located in directory |
| * specified with <code>setClassPath()</code> method. To use any other technique |
| * of class loading one should implement derived class, which would override |
| * <code>findClass</code> method. |
| * |
| * @see nsk.share.ClassUnloader |
| * |
| * @see #setClassPath(String) |
| * @see #findClass(String) |
| */ |
| public class CustomClassLoader extends ClassLoader { |
| |
| private ClassUnloader classUnloader; |
| protected String classPath; |
| |
| /** |
| * Initializes a newly created <code>CustomClassloader</code> object |
| * not yet linked with any <code>ClassUnloader</code> object. |
| * |
| */ |
| public CustomClassLoader() { |
| super(CustomClassLoader.class.getClassLoader()); |
| this.classUnloader = null; |
| } |
| |
| /** |
| * Initializes a newly created <code>CustomClassloader</code> object |
| * linked with specified <code>ClassUnloader</code> object. |
| * |
| * @param classUnloader an instance of <code>ClassUnloader</code> |
| */ |
| public CustomClassLoader(ClassUnloader classUnloader) { |
| super(CustomClassLoader.class.getClassLoader()); |
| this.classUnloader = classUnloader; |
| } |
| |
| /** |
| * Links this class loader with specified <code>ClassUnloader</code> object. |
| * |
| * @param classUnloader an instance of <code>ClassUnloader</code> |
| */ |
| public void setClassUnloader(ClassUnloader classUnloader) { |
| this.classUnloader = classUnloader; |
| } |
| |
| /** |
| * Specifies path to .class file location. |
| * |
| * @param classPath a path to .class file location |
| */ |
| public void setClassPath(String classPath) { |
| this.classPath = classPath; |
| } |
| |
| /** |
| * Finds and loads class for specified class name. |
| * This method loads class from .class file located in a directory |
| * previously specified by <code>setClassPath()</code>. |
| * |
| * @param name The name of the class. |
| * |
| * @throws ClassNotFoundException if no .class file found |
| * for specified class name |
| * |
| * @see #setClassPath(String) |
| */ |
| protected synchronized Class findClass(String name) throws ClassNotFoundException { |
| java.nio.file.Path path = ClassFileFinder.findClassFile(name, classPath); |
| if (path == null) { |
| throw new ClassNotFoundException(name); |
| } |
| String classFileName = path.toString(); |
| |
| FileInputStream in; |
| try { |
| in = new FileInputStream(classFileName); |
| if (in == null) { |
| throw new ClassNotFoundException(classFileName); |
| } |
| } catch (FileNotFoundException e) { |
| throw new ClassNotFoundException(classFileName, e); |
| } |
| |
| int len; |
| byte data[]; |
| try { |
| len = in.available(); |
| data = new byte[len]; |
| for (int total = 0; total < data.length; ) { |
| total += in.read(data, total, data.length - total); |
| } |
| } catch (IOException e) { |
| throw new ClassNotFoundException(classFileName, e); |
| } finally { |
| try { |
| in.close(); |
| } catch (IOException e) { |
| throw new ClassNotFoundException(classFileName, e); |
| } |
| } |
| |
| return defineClass(name, data, 0, data.length); |
| } |
| |
| /** |
| * Notifies <code>ClassUnloader</code> about finalization. |
| */ |
| protected void finalize() throws Throwable { |
| |
| // notify ClassUnloader about finalization |
| if (classUnloader != null) { |
| classUnloader.finalized = true; |
| } |
| |
| super.finalize(); |
| } |
| } |