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The source code

/*
 * Copyright 2001-2004 The Apache Software Foundation
 *
 * Licensed 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.commons.net;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

/***
 * The SocketFactory interface provides a means for the programmer to
 * control the creation of sockets and provide his own Socket
 * implementations for use by all classes derived from
 *  SocketClient .
 * This allows you to provide your own Socket implementations and
 * to perform security checks or browser capability requests before
 * creating a Socket.
 * 

*

* @author Daniel F. Savarese * @see DefaultSocketFactory ***/ public interface SocketFactory { /*** * Creates a Socket connected to the given host and port. *

* @param host The hostname to connect to. * @param port The port to connect to. * @return A Socket connected to the given host and port. * @exception UnknownHostException If the hostname cannot be resolved. * @exception IOException If an I/O error occurs while creating the Socket. ***/ public Socket createSocket(String host, int port) throws UnknownHostException, IOException; /*** * Creates a Socket connected to the given host and port. *

* @param address The address of the host to connect to. * @param port The port to connect to. * @return A Socket connected to the given host and port. * @exception IOException If an I/O error occurs while creating the Socket. ***/ public Socket createSocket(InetAddress address, int port) throws IOException; /*** * Creates a Socket connected to the given host and port and * originating from the specified local address and port. *

* @param host The hostname to connect to. * @param port The port to connect to. * @param localAddr The local address to use. * @param localPort The local port to use. * @return A Socket connected to the given host and port. * @exception UnknownHostException If the hostname cannot be resolved. * @exception IOException If an I/O error occurs while creating the Socket. ***/ public Socket createSocket(String host, int port, InetAddress localAddr, int localPort) throws UnknownHostException, IOException; /*** * Creates a Socket connected to the given host and port and * originating from the specified local address and port. *

* @param address The address of the host to connect to. * @param port The port to connect to. * @param localAddr The local address to use. * @param localPort The local port to use. * @return A Socket connected to the given host and port. * @exception IOException If an I/O error occurs while creating the Socket. ***/ public Socket createSocket(InetAddress address, int port, InetAddress localAddr, int localPort) throws IOException; /*** * Creates a ServerSocket bound to a specified port. A port * of 0 will create the ServerSocket on a system-determined free port. *

* @param port The port on which to listen, or 0 to use any free port. * @return A ServerSocket that will listen on a specified port. * @exception IOException If an I/O error occurs while creating * the ServerSocket. ***/ public ServerSocket createServerSocket(int port) throws IOException; /*** * Creates a ServerSocket bound to a specified port with a given * maximum queue length for incoming connections. A port of 0 will * create the ServerSocket on a system-determined free port. *

* @param port The port on which to listen, or 0 to use any free port. * @param backlog The maximum length of the queue for incoming connections. * @return A ServerSocket that will listen on a specified port. * @exception IOException If an I/O error occurs while creating * the ServerSocket. ***/ public ServerSocket createServerSocket(int port, int backlog) throws IOException; /*** * Creates a ServerSocket bound to a specified port on a given local * address with a given maximum queue length for incoming connections. * A port of 0 will * create the ServerSocket on a system-determined free port. *

* @param port The port on which to listen, or 0 to use any free port. * @param backlog The maximum length of the queue for incoming connections. * @param bindAddr The local address to which the ServerSocket should bind. * @return A ServerSocket that will listen on a specified port. * @exception IOException If an I/O error occurs while creating * the ServerSocket. ***/ public ServerSocket createServerSocket(int port, int backlog, InetAddress bindAddr) throws IOException; }

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