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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.tomcat.util.net;

import java.net.Socket;

import javax.net.ssl.SSLSession;

/* SSLImplementation:

 Abstract factory and base class for all SSL implementations.

 @author EKR
 */
public abstract class SSLImplementation {
    private static final org.apache.juli.logging.Log logger = org.apache.juli.logging.LogFactory
            .getLog(SSLImplementation.class);

    // The default implementations in our search path
    private static final String JSSEImplementationClass =
        "org.apache.tomcat.util.net.jsse.JSSEImplementation";

    private static final String[] implementations = { 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) {
                if (logger.isTraceEnabled())
                    logger.trace("Error creating " + implementations[i], e);
            }
        }

        // 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 {
            // Workaround for the J2SE 1.4.x classloading problem (under
            // Solaris).
            // Class.forName(..) fails without creating class using new.
            // This is an ugly workaround.
            if (JSSEImplementationClass.equals(className)) {
                return new org.apache.tomcat.util.net.jsse.JSSEImplementation();
            }
            Class clazz = Class.forName(className);
            return (SSLImplementation) clazz.newInstance();
        } catch (Exception e) {
            if (logger.isDebugEnabled())
                logger
                        .debug("Error loading SSL Implementation " + className,
                                e);
            throw new ClassNotFoundException(
                    "Error loading SSL Implementation " + className + " :"
                            + e.toString());
        }
    }

    public abstract String getImplementationName();

    public abstract ServerSocketFactory getServerSocketFactory(
            AbstractEndpoint endpoint);

    public abstract SSLSupport getSSLSupport(Socket sock);

    public abstract SSLSupport getSSLSupport(SSLSession session);

    public abstract SSLUtil getSSLUtil(AbstractEndpoint ep);
}