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/* SocketInputStream.java -- An InputStream for Sockets
Copyright (C) 1998,2000 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.
As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */
package java.net;
import java.io.InputStream;
import java.io.IOException;
/**
* This class contains an implementation of <code>InputStream</code> for
* sockets. It in an internal only class used by <code>PlainSocketImpl</code>.
*
* @author Aaron M. Renn (arenn@urbanophile.com)
*/
class SocketInputStream extends InputStream
{
/*************************************************************************/
/*
* Instance Variables
*/
/**
* The PlainSocketImpl object this stream is associated with
*/
private PlainSocketImpl impl;
/*************************************************************************/
/*
* Constructors
*/
/**
* Builds an instance of this class from a PlainSocketImpl object
*/
protected
SocketInputStream(PlainSocketImpl impl)
{
this.impl = impl;
}
/*************************************************************************/
/*
* Instance Methods
*/
/**
* Returns the number of bytes available to be read before blocking
*/
public int
available() throws IOException
{
return(impl.available());
}
/*************************************************************************/
/**
* Determines if "mark" functionality is supported on this stream. For
* sockets, this is always false. Note that the superclass default is
* false, but it is overridden out of safety concerns and/or paranoia.
*/
public boolean
markSupported()
{
return(false);
}
/*************************************************************************/
/**
* Do nothing mark method since we don't support this functionality. Again,
* overriding out of paranoia.
*
* @param readlimit In theory, the number of bytes we can read before the mark becomes invalid
*/
public void
mark(int readlimit)
{
}
/*************************************************************************/
/**
* Since we don't support mark, this method always throws an exception
*
* @exception IOException Everytime since we don't support this functionality
*/
public void
reset() throws IOException
{
throw new IOException("Socket InputStreams do not support mark/reset");
}
/*************************************************************************/
/**
* This method not only closes the stream, it closes the underlying socket
* (and thus any connection) and invalidates any other Input/Output streams
* for the underlying impl object
*/
public void
close() throws IOException
{
impl.close();
}
/*************************************************************************/
/**
* Reads the next byte of data and returns it as an int.
*
* @return The byte read (as an int) or -1 if end of stream);
*
* @exception IOException If an error occurs.
*/
public int
read() throws IOException
{
byte buf[] = new byte[1];
int bytes_read = read(buf, 0, buf.length);
if (bytes_read != -1)
return((int)buf[0]);
else
return(-1);
}
/*************************************************************************/
/**
* Reads up to buf.length bytes of data into the caller supplied buffer.
*
* @return The actual number of bytes read or -1 if end of stream
*
* @exception IOException If an error occurs.
*/
public int
read(byte[] buf) throws IOException
{
return(read(buf, 0, buf.length));
}
/*************************************************************************/
/**
* Reads up to len bytes of data into the caller supplied buffer starting
* at offset bytes from the start of the buffer
*
* @return The number of bytes actually read or -1 if end of stream
*
* @exception IOException If an error occurs.
*/
public int
read(byte[] buf, int offset, int len) throws IOException
{
int bytes_read = impl.read(buf, offset, len);
if (bytes_read == 0)
return(-1);
return(bytes_read);
}
} // class SocketInputStream
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