Quadcap Embeddable Server

com/quadcap/http/servlets/jsp/JspClassLoader.java

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package com.quadcap.http.servlets.jsp;

/* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.util.Hashtable;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import com.quadcap.util.Debug;

/**
 * This class implements a JSP class loader
 *
 * @author Stan Bailes
 */
public class JspClassLoader extends ClassLoader {
    File                        root;

    public JspClassLoader(ClassLoader parent, File root) {
        super(parent);
        this.root = root;
    }

    public Class loadClass(String name) throws ClassNotFoundException {
        return loadClass(name, true);
    }

//-    //#ifdef JDK11
//-    Hashtable                        cache = new Hashtable();
//-
//-    public Class loadClass(String name, boolean resolve) 
//-     throws ClassNotFoundException 
//-    {
//-     Class c = (Class)cache.get(name);
//-     if (c == null) {
//-         c = findClass(name);
//-         cache.put(name, c);
//-     }
//-     if (resolve)
//-         resolveClass(c);
//-     return c;
//-    }
//-
    //#endif

    public Class findClass(String name) throws ClassNotFoundException {
        //#ifdef DEBUG
        if (Trace.level() > 1) {
            Debug.println("JspClassLoader.findClass(" + name + ")");
        }
        //#endif
        byte[] b = loadClassData(name);
        return defineClass(name, b, 0, b.length);
    }

    private byte[] loadClassData(String name) throws ClassNotFoundException {
        try {
            String fileName = name.replace('.', File.separatorChar);
            File classFile = new File(root, fileName + ".class");
            int len = (int)(classFile.length());
            byte[] b = new byte[len];
            FileInputStream f = new FileInputStream(classFile);
            f.read(b);
            f.close();
            return b;
        } catch (IOException e) {
            throw new ClassNotFoundException("error loading class: " + 
                                             e.toString());
        }
    }

}