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/*
* DirectoryListing.java
* Copyright (C) 2003 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.gopher;
import java.io.InputStream;
import java.io.IOException;
import java.net.ProtocolException;
import java.util.Iterator;
import java.util.NoSuchElementException;
import gnu.inet.util.LineInputStream;
/**
* A gopher directory listing.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
*/
public final class DirectoryListing
implements Iterator
{
private static final String DOT = ".";
private LineInputStream in;
private boolean doneRead = false;
private DirectoryEntry current;
DirectoryListing(InputStream in)
{
this.in = new LineInputStream(in);
}
/**
* Indicates whether this listing contains more entries.
*/
public boolean hasNext()
{
try
{
fetch();
}
catch (IOException e)
{
return false;
}
return (current != null);
}
/**
* @see #nextEntry
*/
public Object next()
{
try
{
return nextEntry();
}
catch (IOException e)
{
throw new NoSuchElementException("I/O error: " + e.getMessage());
}
}
/**
* This iterator is read-only.
*/
public void remove()
{
throw new UnsupportedOperationException();
}
/**
* Returns the next entry in the directory listing.
*/
public DirectoryEntry nextEntry()
throws IOException
{
fetch();
if (current == null)
{
throw new NoSuchElementException();
}
doneRead = false;
return current;
}
void fetch()
throws IOException
{
if (doneRead)
{
return;
}
String line = in.readLine();
if (DOT.equals(line))
{
current = null;
}
else
{
// Parse line
int type = DirectoryEntry.ERROR;
switch(line.charAt(0))
{
case '0':
type = DirectoryEntry.FILE;
break;
case '1':
type = DirectoryEntry.DIRECTORY;
break;
case '2':
type = DirectoryEntry.CSO_PHONE_BOOK;
break;
case '3':
type = DirectoryEntry.ERROR;
break;
case '4':
type = DirectoryEntry.BINHEX;
break;
case '5':
type = DirectoryEntry.DOS_ARCHIVE;
break;
case '6':
type = DirectoryEntry.UUENCODED;
break;
case '7':
type = DirectoryEntry.INDEX_SEARCH;
break;
case '8':
type = DirectoryEntry.TELNET;
break;
case '9':
type = DirectoryEntry.BINARY;
break;
case '+':
type = DirectoryEntry.REDUNDANT;
break;
case 'T':
type = DirectoryEntry.TN3270;
break;
case 'g':
type = DirectoryEntry.GIF;
break;
case 'I':
type = DirectoryEntry.IMAGE;
break;
}
int start = 1;
int end = line.indexOf('\t', start);
if (end == -1)
{
throw new ProtocolException("Invalid directory entry: " + line);
}
String title = line.substring(start, end);
start = end + 1;
end = line.indexOf('\t', start);
if (end == -1)
{
throw new ProtocolException("Invalid directory entry: " + line);
}
String selector = line.substring(start, end);
start = end + 1;
end = line.indexOf('\t', start);
if (end == -1)
{
throw new ProtocolException("Invalid directory entry: " + line);
}
String hostname = line.substring(start, end);
start = end + 1;
int port = Integer.parseInt(line.substring(start));
current = new DirectoryEntry(type, title, selector, hostname, port);
}
}
}
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