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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
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 * GPL Classpath Exception:
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 */

package org.glassfish.enterprise.iiop.impl;

import java.io.*;

public class HandleDelegateClassLoader
    extends ClassLoader
{
    
    public HandleDelegateClassLoader() {
        super();
    }
    
    protected Class findClass(String name)
        throws ClassNotFoundException
    {
        // This is called only if the class could not be loaded by
        // the parent class loader (see javadoc for loadClass methods).
        // Load the class from the current thread's context class loader.
        
        Class c = Thread.currentThread().getContextClassLoader().loadClass(name);
        
        return c;
    }
    
    protected Class loadClass(String name, boolean resolve)
        throws ClassNotFoundException
    {
        if (!name.equals("com.sun.enterprise.iiop.IIOPHandleDelegate")) {
            return super.loadClass(name, resolve);
        }
        
        Class handleDelClass = findLoadedClass(name);
        if (handleDelClass != null) {
            return handleDelClass;
        }

        InputStream is = null;
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            // read the bytes for IIOPHandleDelegate.class
            ClassLoader resCl = Thread.currentThread().getContextClassLoader();
            if (Thread.currentThread().getContextClassLoader() == null)  {
                resCl = getSystemClassLoader();
            }
            is = resCl.getResourceAsStream("org/glassfish/enterprise/iiop/impl/IIOPHandleDelegate.class");

            byte[] buf = new byte[4096]; // currently IIOPHandleDelegate is < 4k
            int nread = 0;
            while ( (nread = is.read(buf, 0, buf.length)) != -1 ) {
                baos.write(buf, 0, nread);
            }

            byte[] buf2 = baos.toByteArray();
            
            handleDelClass = defineClass(
            "org.glassfish.enterprise.iiop.impl.IIOPHandleDelegate",
            buf2, 0, buf2.length);
            
        } catch ( Exception ex ) {
            throw (ClassNotFoundException)new ClassNotFoundException(ex.getMessage()).initCause(ex);
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException ioe) {
                    //ignore
                }
            }
        }
        
        if (resolve) {
            resolveClass(handleDelClass);
        }
        
        return handleDelClass;
    }
}