001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.net;
019
020import java.net.DatagramSocket;
021import java.net.InetAddress;
022import java.net.SocketException;
023
024/**
025 * The DatagramSocketFactory interface provides a means for the programmer to control the creation of datagram sockets and provide his own DatagramSocket
026 * implementations for use by all classes derived from {@link org.apache.commons.net.DatagramSocketClient} . This allows you to provide your own DatagramSocket
027 * implementations and to perform security checks or browser capability requests before creating a DatagramSocket.
028 */
029
030public interface DatagramSocketFactory {
031
032    /**
033     * Creates a DatagramSocket on the local host at the first available port.
034     *
035     * @return the socket
036     *
037     * @throws SocketException If the socket could not be created.
038     */
039    DatagramSocket createDatagramSocket() throws SocketException;
040
041    /**
042     * Creates a DatagramSocket on the local host at a specified port.
043     *
044     * @param port The port to use for the socket.
045     * @return the socket
046     * @throws SocketException If the socket could not be created.
047     */
048    DatagramSocket createDatagramSocket(int port) throws SocketException;
049
050    /**
051     * Creates a DatagramSocket at the specified address on the local host at a specified port.
052     *
053     * @param port  The port to use for the socket.
054     * @param localAddress The local address to use.
055     * @return the socket
056     * @throws SocketException If the socket could not be created.
057     */
058    DatagramSocket createDatagramSocket(int port, InetAddress localAddress) throws SocketException;
059}