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/*
* $Id: LineIterator.java,v 1.4 2004/07/28 09:37:21 dog Exp $
* Copyright (C) 2002 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib 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 of the License, or
* (at your option) any later version.
*
* GNU inetlib 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 this library; 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 gnu.inet.nntp;
import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* An iterator over an NNTP multi-line response.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
* @version $Revision: 1.4 $ $Date: 2004/07/28 09:37:21 $
*/
public class LineIterator implements Iterator, PendingData
{
static final String DOT = ".";
boolean doneRead = false;
NNTPConnection connection;
String current;
LineIterator (NNTPConnection connection)
{
this.connection = connection;
}
void doRead () throws IOException
{
if (doneRead)
{
return;
}
String line = connection.read ();
if (DOT.equals (line))
{
current = null;
}
else
{
current = line;
}
doneRead = true;
}
/**
* Indicates whether there are more lines to be read.
*/
public boolean hasNext ()
{
try
{
doRead ();
}
catch (IOException e)
{
return false;
}
return (current != null);
}
/**
* Returns the next line.
*/
public Object next ()
{
try
{
return nextLine ();
}
catch (IOException e)
{
throw new NoSuchElementException ("I/O error: " + e.getMessage ());
}
}
/**
* Returns the next line.
*/
public String nextLine () throws IOException
{
doRead ();
if (current == null)
{
throw new NoSuchElementException ();
}
doneRead = false;
return current;
}
/**
* This iterator is read-only.
*/
public void remove ()
{
throw new UnsupportedOperationException ();
}
/**
* Read to the end of this iterator.
*/
public void readToEOF () throws IOException
{
do
{
doRead ();
}
while (current != null);
}
}
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