sslimplementation.java

Tomcat 4.1与WebServer集成组件的源代码包.

/*
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 * The Apache Software License, Version 1.1
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 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
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package org.apache.tomcat.util.net;

import java.io.*;
import java.net.*;

/* SSLImplementation:

   Abstract factory and base class for all SSL implementations.

   @author EKR
*/
abstract public class SSLImplementation {
    // The default implementations in our search path
    private static final String PureTLSImplementationClass=
	"org.apache.tomcat.util.net.puretls.PureTLSImplementation";
    private static final String JSSEImplementationClass=
	"org.apache.tomcat.util.net.jsse.JSSEImplementation";
    
    private static final String[] implementations=
    {
	PureTLSImplementationClass,
	JSSEImplementationClass
    };

    public static SSLImplementation getInstance() throws ClassNotFoundException
    {
	for(int i=0;i<implementations.length;i++){
	    try {
		SSLImplementation impl=
		    getInstance(implementations[i]);
		return impl;
	    } catch (Exception e) {
		//e.printStackTrace();
	    }
	}

	// If we can't instantiate any of these
	throw new ClassNotFoundException("Can't find any SSL implementation");
    }

    public static SSLImplementation getInstance(String className)
	throws ClassNotFoundException
    {
	if(className==null) return getInstance();

	try {
	    Class clazz=Class.forName(className);
	    return (SSLImplementation)clazz.newInstance();
	} catch (Exception e){
	    throw new ClassNotFoundException("Error loading SSL Implementation "
				      +className+ " :" +e.toString());
	}
    }

    abstract public String getImplementationName();
    abstract public ServerSocketFactory getServerSocketFactory();
    abstract public SSLSupport getSSLSupport(Socket sock);
}