81 lines
3.2 KiB
Java
81 lines
3.2 KiB
Java
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package nsk.share.classload;
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import java.io.*;
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import java.util.*;
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import nsk.share.FileUtils;
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/**
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* Custom classloader that does not delegate to it's parent.
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*
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* It can load classes from classpath that have name containing
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* "Class" (any package).
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*/
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public class ClassPathNonDelegatingClassLoader extends ClassLoader {
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private String [] classPath;
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public ClassPathNonDelegatingClassLoader() {
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classPath = System.getProperty("java.class.path").split(File.pathSeparator);
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}
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public synchronized Class loadClass(String name, boolean resolve)
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throws ClassNotFoundException {
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Class c = findLoadedClass(name);
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if (c != null) {
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System.out.println("Found class: " + name);
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return c;
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}
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if (name.contains("Class")) {
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String newName = name.replace('.', '/');
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return loadClassFromFile(name, newName + ".class", resolve);
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} else {
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return findSystemClass(name);
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}
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}
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private Class loadClassFromFile(String name, String fname, boolean resolve)
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throws ClassNotFoundException {
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try {
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File target = new File("");
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for(int i = 0; i < classPath.length; ++i) {
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target = new File(classPath[i] + File.separator + fname);
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if (target.exists())
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break;
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}
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if (!target.exists())
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throw new java.io.FileNotFoundException();
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byte[] buffer = FileUtils.readFile(target);
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Class c = defineClass(name, buffer, 0, buffer.length);
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if (resolve)
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resolveClass(c);
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return c;
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} catch (IOException e) {
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throw new ClassNotFoundException("Exception while reading classfile data", e);
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}
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}
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}
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