/*
 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/protocol/ProtocolSocketFactory.java,v 1.10 2004/05/13 04:01:22 mbecke Exp $
 * $Revision: 480424 $
 * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
 *
 * ====================================================================
 *
 *  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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.commons.httpclient.protocol;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.params.HttpConnectionParams;

A factory for creating Sockets.
Both Object.equals() and Object.hashCode() should be overridden appropriately. Protocol socket factories are used to uniquely identify Protocols and 
HostConfigurations, and equals() and hashCode() are 
required for the correct operation of some connection managers.
Author:
Michael Becke, Mike Bowler
See Also:
Protocol
Since:
2.0/**
 * A factory for creating Sockets.
 * 
 * <p>Both {@link java.lang.Object#equals(java.lang.Object) Object.equals()} and 
 * {@link java.lang.Object#hashCode() Object.hashCode()} should be overridden appropriately.  
 * Protocol socket factories are used to uniquely identify <code>Protocol</code>s and 
 * <code>HostConfiguration</code>s, and <code>equals()</code> and <code>hashCode()</code> are 
 * required for the correct operation of some connection managers.</p>
 * 
 * @see Protocol
 * 
 * @author Michael Becke
 * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
 * 
 * @since 2.0
 */
public interface ProtocolSocketFactory {

    
Gets a new socket connection to the given host.
Params:
host – the host name/IP
port – the port on the host
localAddress – the local host name/IP to bind the socket to
localPort – the port on the local machine
Throws:
IOException – if an I/O error occurs while creating the socket
UnknownHostException – if the IP address of the host cannot be
determined
Returns:
Socket a new socket/**
     * Gets a new socket connection to the given host.
     * 
     * @param host the host name/IP
     * @param port the port on the host
     * @param localAddress the local host name/IP to bind the socket to
     * @param localPort the port on the local machine
     * 
     * @return Socket a new socket
     * 
     * @throws IOException if an I/O error occurs while creating the socket
     * @throws UnknownHostException if the IP address of the host cannot be
     * determined
     */
    Socket createSocket(
        String host, 
        int port, 
        InetAddress localAddress, 
        int localPort
    ) throws IOException, UnknownHostException;

    
Gets a new socket connection to the given host.
Params:
host – the host name/IP
port – the port on the host
localAddress – the local host name/IP to bind the socket to
localPort – the port on the local machine
params – Http connection parameters
Throws:
IOException – if an I/O error occurs while creating the socket
UnknownHostException – if the IP address of the host cannot be
determined
ConnectTimeoutException – if socket cannot be connected within the
 given time limit
Returns:
Socket a new socket
Since:
3.0/**
     * Gets a new socket connection to the given host.
     * 
     * @param host the host name/IP
     * @param port the port on the host
     * @param localAddress the local host name/IP to bind the socket to
     * @param localPort the port on the local machine
     * @param params {@link HttpConnectionParams Http connection parameters}
     * 
     * @return Socket a new socket
     * 
     * @throws IOException if an I/O error occurs while creating the socket
     * @throws UnknownHostException if the IP address of the host cannot be
     * determined
     * @throws ConnectTimeoutException if socket cannot be connected within the
     *  given time limit
     * 
     * @since 3.0
     */
    Socket createSocket(
        String host, 
        int port, 
        InetAddress localAddress, 
        int localPort,
        HttpConnectionParams params
    ) throws IOException, UnknownHostException, ConnectTimeoutException;

    
Gets a new socket connection to the given host.
Params:
host – the host name/IP
port – the port on the host
Throws:
IOException – if an I/O error occurs while creating the socket
UnknownHostException – if the IP address of the host cannot be
determined
Returns:
Socket a new socket/**
     * Gets a new socket connection to the given host.
     *
     * @param host the host name/IP
     * @param port the port on the host
     *
     * @return Socket a new socket
     *
     * @throws IOException if an I/O error occurs while creating the socket
     * @throws UnknownHostException if the IP address of the host cannot be
     * determined
     */
    Socket createSocket(
        String host, 
        int port
    ) throws IOException, UnknownHostException;

}