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/*
* LineIterator.java
* 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
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
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>
*/
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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