227 lines
7.0 KiB
Java
227 lines
7.0 KiB
Java
/* SocketImpl.java -- Abstract socket implementation class
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Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.net;
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import java.io.*;
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/* Written using on-line Java Platform 1.2 API Specification.
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* Believed complete and correct.
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*/
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/**
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* This abstract class serves as the parent class for socket implementations.
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* The implementation class serves an intermediary to native routines that
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* perform system specific socket operations.
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* <p>
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* A default implementation is provided by the system, but this can be
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* changed via installing a <code>SocketImplFactory</code> (through a call
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* to the static method <code>Socket.setSocketImplFactory</code>). A
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* subclass of <code>Socket</code> can also pass in a <code>SocketImpl</code>
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* to the <code>Socket(SocketImpl)</code> constructor to use an
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* implementation different from the system default without installing
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* a factory.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Per Bothner <bothner@cygnus.com>
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*/
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public abstract class SocketImpl implements SocketOptions
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{
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/**
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* The address of the remote end of the socket connection
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*/
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protected InetAddress address;
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/**
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* A FileDescriptor object representing this socket connection.
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*/
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protected FileDescriptor fd;
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/**
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* The port number the socket is bound to locally
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*/
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protected int localport;
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/**
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* The port number of the remote end of the socket connection
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*/
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protected int port;
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/**
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* Default, no-argument constructor for use by subclasses.
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*/
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public SocketImpl ()
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{
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}
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/**
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* Creates a new socket that is not bound to any local address/port and
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* is not connected to any remote address/port. This will be created as
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* a stream socket if the stream parameter is true, or a datagram socket
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* if the stream parameter is false.
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*
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* @param stream true for a stream socket, false for a datagram socket
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*/
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protected abstract void create (boolean stream) throws IOException;
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/**
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* Connects to the remote hostname and port specified as arguments.
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*
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* @param host The remote hostname to connect to
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* @param port The remote port to connect to
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*
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* @exception IOException If an error occurs
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*/
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protected abstract void connect (String host, int port) throws IOException;
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/**
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* Connects to the remote address and port specified as arguments.
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*
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* @param host The remote address to connect to
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* @param port The remote port to connect to
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*
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* @exception IOException If an error occurs
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*/
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protected abstract void connect (InetAddress host, int port)
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throws IOException;
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/**
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* Binds to the specified port on the specified addr. Note that this addr
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* must represent a local IP address.
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* <p>
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* Note that it is unspecified how to bind to all interfaces on the localhost
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* (INADDR_ANY).
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*
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* @param host The address to bind to
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* @param port The port number to bind to
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*
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* @exception IOException If an error occurs
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*/
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protected abstract void bind (InetAddress host, int port) throws IOException;
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/**
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* Starts listening for connections on a socket. The backlog parameter
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* is how many pending connections will queue up waiting to be serviced
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* before being accept'ed. If the queue of pending requests exceeds this
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* number, additional connections will be refused.
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*
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* @param backlog The length of the pending connection queue
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*
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* @exception IOException If an error occurs
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*/
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protected abstract void listen (int backlog) throws IOException;
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/**
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* Accepts a connection on this socket.
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*
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* @param s The implementation object for the accepted connection.
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*
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* @exception IOException If an error occurs
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*/
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protected abstract void accept (SocketImpl s) throws IOException;
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/**
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* Returns an <code>InputStream</code> object for reading from this socket.
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*
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* @return An <code>InputStream</code> for reading from this socket.
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*
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* @exception IOException If an error occurs
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*/
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protected abstract InputStream getInputStream() throws IOException;
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/**
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* Returns an <code>OutputStream</code> object for writing to this socket
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*
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* @return An <code>OutputStream</code> for writing to this socket.
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*
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* @exception IOException If an error occurs.
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*/
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protected abstract OutputStream getOutputStream() throws IOException;
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/**
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* Returns the number of bytes that the caller can read from this socket
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* without blocking.
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*
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* @return The number of readable bytes before blocking
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*
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* @exception IOException If an error occurs
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*/
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protected abstract int available () throws IOException;
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/**
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* Closes the socket. This will normally cause any resources, such as the
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* InputStream, OutputStream and associated file descriptors to be freed.
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* <p>
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* Note that if the SO_LINGER option is set on this socket, then the
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* operation could block.
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*
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* @exception IOException If an error occurs
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*/
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protected abstract void close () throws IOException;
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/**
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* Returns the FileDescriptor objects for this socket.
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*
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* @return A FileDescriptor for this socket.
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*/
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protected FileDescriptor getFileDescriptor () { return fd; }
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/**
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* Returns the remote address this socket is connected to
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*
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* @return The remote address
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*/
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protected InetAddress getInetAddress () { return address; }
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/**
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* Returns the remote port this socket is connected to
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*
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* @return The remote port
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*/
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protected int getPort () { return port; }
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/**
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* Returns the local port this socket is bound to
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*
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* @return The local port
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*/
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protected int getLocalPort () { return localport; }
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/**
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* Returns a <code>String</code> representing the remote host and port of this
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* socket.
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*
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* @return A <code>String</code> for this socket.
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*/
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public String toString ()
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{
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return "[addr=" + address.toString() + ",port=" + Integer.toString(port) +
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",localport=" + Integer.toString(localport) + "]";
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}
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}
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