135 lines
3.6 KiB
Java
135 lines
3.6 KiB
Java
// MulticastSocket.java
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/* Copyright (C) 1999 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.net;
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import java.io.IOException;
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/**
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* @author Warren Levy <warrenl@cygnus.com>
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* @date May 18, 1999.
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*/
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/**
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* Written using on-line Java Platform 1.2 API Specification, as well
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* as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
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* Status: Believed complete and correct.
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*/
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public class MulticastSocket extends DatagramSocket
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{
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// FIXME: the local addr bound to the multicast socket can be reused;
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// unlike unicast sockets. It binds to any available network interface.
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// See p.1159 JCL book.
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public MulticastSocket() throws IOException
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{
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super(0, ServerSocket.ANY_IF);
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}
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public MulticastSocket(int port) throws IOException
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{
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super(port, ServerSocket.ANY_IF);
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}
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public InetAddress getInterface() throws SocketException
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{
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// FIXME: Is it possible that an InetAddress wasn't returned from getOption?
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return (InetAddress) impl.getOption(SocketOptions.IP_MULTICAST_IF);
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}
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// Deprecated in JDK1.2
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public byte getTTL() throws IOException
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{
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// Use getTTL here rather than getTimeToLive in case we're using an impl
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// other than the default PlainDatagramSocketImpl and it doesn't have
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// getTimeToLive yet.
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return impl.getTTL();
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}
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// JDK1.2
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public int getTimeToLive() throws IOException
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{
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return impl.getTimeToLive();
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}
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public void setInterface(InetAddress inf) throws SocketException
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{
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impl.setOption(SocketOptions.IP_MULTICAST_IF, inf);
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}
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// Deprecated in JDK1.2
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public void setTTL(byte ttl) throws IOException
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{
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// Use setTTL here rather than setTimeToLive in case we're using an impl
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// other than the default PlainDatagramSocketImpl and it doesn't have
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// setTimeToLive yet.
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impl.setTTL(ttl);
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}
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// JDK1.2
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public void setTimeToLive(int ttl) throws IOException
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{
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if (ttl <= 0 || ttl > 255)
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throw new IllegalArgumentException("Invalid ttl: " + ttl);
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impl.setTimeToLive(ttl);
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}
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public void joinGroup(InetAddress mcastaddr) throws IOException
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{
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// FIXME: We can't currently rely on NullPointerException being
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// thrown when we invoke a method on a null object.
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if (mcastaddr == null)
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throw new NullPointerException("Null address");
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if (! mcastaddr.isMulticastAddress())
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throw new IOException("Not a Multicast address");
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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s.checkMulticast(mcastaddr);
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impl.join(mcastaddr);
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}
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public void leaveGroup(InetAddress mcastaddr) throws IOException
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{
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// FIXME: We can't currently rely on NullPointerException being
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// thrown when we invoke a method on a null object.
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if (mcastaddr == null)
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throw new NullPointerException("Null address");
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if (! mcastaddr.isMulticastAddress())
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throw new IOException("Not a Multicast address");
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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s.checkMulticast(mcastaddr);
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impl.leave(mcastaddr);
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}
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public synchronized void send(DatagramPacket p, byte ttl) throws IOException
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{
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SecurityManager s = System.getSecurityManager();
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if (s != null)
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{
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InetAddress addr = p.getAddress();
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if (addr.isMulticastAddress())
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s.checkMulticast(addr, ttl);
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else
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s.checkConnect(addr.getHostAddress(), p.getPort());
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}
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int oldttl = impl.getTimeToLive();
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impl.setTimeToLive(((int) ttl) & 0xFF);
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impl.send(p);
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impl.setTimeToLive(oldttl);
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}
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}
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