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120 lines
4.6 KiB
120 lines
4.6 KiB
// serverClassLoader.java
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// -----------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 11.07.2004
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.server;
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import java.io.*;
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import java.util.*;
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import java.lang.reflect.*;
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public final class serverClassLoader extends ClassLoader {
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private final Hashtable classes;
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public serverClassLoader() {
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super(ClassLoader.getSystemClassLoader());
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classes = new Hashtable();
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}
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public serverClassLoader(ClassLoader parent) {
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super(parent);
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classes = new Hashtable();
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}
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public Package[] packages() {
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return super.getPackages();
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}
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public Class loadClass(File classfile) throws ClassNotFoundException {
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// we consider that the classkey can either be only the name of a class, or a partial or
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// complete path to a class file
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// normalize classkey: strip off '.class'
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//if (classkey.endsWith(".class")) classkey = classkey.substring(0, classkey.length() - 6);
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// try to find the class in the hashtable
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Class c = (Class) classes.get(classfile);
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if (c != null) return c;
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// consider classkey as a file and extract the file name
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//File classfile = new File(classkey);
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// this file cannot exist for real, since we stripped off the .class
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// we constructed the classfile for the only purpose to strip off the name:
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// get the class name out of the classfile
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String classname = classfile.getName();
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int p = classname.indexOf(".");
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classname = classname.substring(0, p);
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// now that we have the name, we can create the real class file
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//classfile = new File(classkey + ".class");
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// first try: take the class out of the cache, denoted by the classname
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try {
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c = findLoadedClass(classname);
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if (c == null) {
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// second try: ask the system
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c = findSystemClass(classname);
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}
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if (c == null) {
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// third try
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throw new ClassNotFoundException("internal trigger");
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}
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} catch (ClassNotFoundException e) {
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//System.out.println("INTERNAL ERROR1 in cachedClassLoader: " + e.getMessage());
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// third try: load the file from the file system
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byte[] b;
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try {
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b = serverFileUtils.read(classfile);
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// now make a class out of the stream
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// System.out.println("loading class " + classname + " from file " + classfile.toString());
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c = this.defineClass(classname, b, 0, b.length);
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resolveClass(c);
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classes.put(classfile, c);
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} catch (IOException ee) {
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//System.out.println("INTERNAL ERROR2 in cachedClassLoader: " + ee.getMessage());
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throw new ClassNotFoundException(classfile.toString());
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}
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}
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return c;
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}
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} |