/*

 * Copyright (c) 2001, 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.

 */

/**

 *

 */

import java.util.*;

import java.io.*;

class ClassLoaderTarg extends ClassLoader {

    private Hashtable loaded = new Hashtable();

    String id;

    public ClassLoaderTarg(String id) {

        this.id = id;

    }

    private byte[] loadClassBytes(String cname)

                                         throws ClassNotFoundException {

        StringTokenizer stk = new StringTokenizer(System.getProperty("java.class.path"),

                                                  File.pathSeparator);

        /* search class path for the class file */

        while (stk.hasMoreTokens()) {

           File cfile = new File(stk.nextToken() + File.separator +

                                 cname + ".class");

           if (cfile.exists()) {

               System.out.println("loading from: " + cfile);

               return loadBytes(cfile, cname);

           } else {

               System.out.println("no file: " + cfile + " - trying next");

           }

        }

        throw new ClassNotFoundException(cname);

    }

    private byte[] loadBytes(File cfile, String cname)

                                         throws ClassNotFoundException {

        try {

            long fsize = cfile.length();

            if (fsize > 0) {

                FileInputStream in = new FileInputStream(cfile);

                byte[] cbytes = new byte[(int)fsize];

                in.read(cbytes);

                in.close();

                return cbytes;

            }

        } catch (IOException exc) {

            // drop down

        }

        throw new ClassNotFoundException(cname);

    }

    public synchronized Class findClass(String cname)

                                     throws ClassNotFoundException {

        Class klass = (Class)loaded.get(cname);

        if (klass == null) {

            byte[] cbytes = loadClassBytes(cname);

            klass = defineClass(cname, cbytes, 0, cbytes.length);

            loaded.put(cname, klass);

            System.err.println("ClassLoaderTarg (" + id +") loaded: " + cname);

        }

        return klass;

    }

    protected void finalize() {

        UnloadEventTarg.classLoaderFinalized(id);

        try {

            super.finalize();

        } catch (Throwable thrown) {

        }

    }

}