/*
* Created on 21-May-2004
* Created by Paul Gardner
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* This program 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.
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package org.gudy.azureus2.pluginsimpl.local.utils.resourcedownloader;
/**
* @author parg
*
*/
import java.io.*;
import java.net.URL;
import org.gudy.azureus2.core3.util.*;
import org.gudy.azureus2.core3.html.*;
import org.gudy.azureus2.plugins.utils.resourcedownloader.*;
public class
ResourceDownloaderMetaRefreshImpl
extends ResourceDownloaderBaseImpl
implements ResourceDownloaderListener
{
public static final int MAX_FOLLOWS = 1;
protected ResourceDownloaderBaseImpl delegate;
protected ResourceDownloaderBaseImpl current_delegate;
protected long size = -2;
protected boolean cancelled;
protected ResourceDownloader current_downloader;
protected Object result;
protected int done_count;
protected AESemaphore done_sem = new AESemaphore("RDMetaRefresh");
public
ResourceDownloaderMetaRefreshImpl(
ResourceDownloaderBaseImpl _parent,
ResourceDownloader _delegate )
{
super( _parent );
delegate = (ResourceDownloaderBaseImpl)_delegate;
delegate.setParent( this );
current_delegate = delegate;
}
public String
getName()
{
return( delegate.getName() + ": meta-refresh" );
}
public long
getSize()
throws ResourceDownloaderException
{
if ( size == -2 ){
try{
size = getSizeSupport();
}finally{
if ( size == -2 ){
size = -1;
}
setSize( size );
}
}
return( size );
}
protected void
setSize(
long l )
{
size = l;
if ( size >= 0 ){
delegate.setSize( size );
}
}
public void
setProperty(
String name,
Object value )
throws ResourceDownloaderException
{
setPropertySupport( name, value );
delegate.setProperty( name, value );
}
protected long
getSizeSupport()
throws ResourceDownloaderException
{
try{
ResourceDownloader x = delegate.getClone( this );
addReportListener( x );
HTMLPage page = HTMLPageFactory.loadPage( x.download());
URL base_url = (URL)x.getProperty( "URL_URL" );
URL redirect = page.getMetaRefreshURL( base_url );
if ( redirect == null ){
ResourceDownloaderBaseImpl c = delegate.getClone( this );
addReportListener( c );
long res = c.getSize();
setProperties( c );
return( res );
}else{
ResourceDownloaderURLImpl c = new ResourceDownloaderURLImpl( getParent(), redirect );
addReportListener( c );
long res = c.getSize();
setProperties( c );
return( res );
}
}catch( HTMLException e ){
throw( new ResourceDownloaderException( this, "getSize failed", e ));
}
}
public ResourceDownloaderBaseImpl
getClone(
ResourceDownloaderBaseImpl parent )
{
ResourceDownloaderMetaRefreshImpl c = new ResourceDownloaderMetaRefreshImpl( parent, delegate.getClone( this ));
c.setSize( size );
c.setProperties( this );
return( c );
}
public InputStream
download()
throws ResourceDownloaderException
{
asyncDownload();
done_sem.reserve();
if ( result instanceof InputStream ){
return((InputStream)result);
}
throw((ResourceDownloaderException)result);
}
public void
asyncDownload()
{
try{
this_mon.enter();
if ( cancelled ){
done_sem.release();
informFailed((ResourceDownloaderException)result);
}else{
done_count++;
current_downloader = current_delegate.getClone( this );
informActivity( getLogIndent() + "Downloading: " + getName());
current_downloader.addListener( this );
current_downloader.asyncDownload();
}
}finally{
this_mon.exit();
}
}
public void
cancel()
{
setCancelled();
try{
this_mon.enter();
result = new ResourceDownloaderCancelledException( this );
cancelled = true;
informFailed((ResourceDownloaderException)result );
done_sem.release();
if ( current_downloader != null ){
current_downloader.cancel();
}
}finally{
this_mon.exit();
}
}
public boolean
completed(
ResourceDownloader downloader,
InputStream data )
{
boolean complete = false;
try{
if ( done_count == 1 ){
// assumption is that there is a refresh tag
boolean marked = false;
if ( data.markSupported()){
data.mark(data.available());
marked = true;
}
// leave file open if marked so we can recover
HTMLPage page = HTMLPageFactory.loadPage( data, !marked );
URL base_url = (URL)downloader.getProperty( "URL_URL" );
URL redirect = page.getMetaRefreshURL( base_url );
if ( redirect == null ){
if ( !marked ){
failed( downloader, new ResourceDownloaderException( this, "meta refresh tag not found and input stream not recoverable"));
}else{
data.reset();
complete = true;
}
}else{
current_delegate = new ResourceDownloaderURLImpl( this, redirect );
// informActivity( "meta-refresh -> " + current_delegate.getName());
asyncDownload();
}
if ( marked && !complete){
data.close();
}
}else{
complete = true;
}
if ( complete ){
if ( informComplete( data )){
result = data;
done_sem.release();
}
}
}catch( Throwable e ){
failed( downloader, new ResourceDownloaderException( this, "meta-refresh processing fails", e ));
}
return( true );
}
public void
failed(
ResourceDownloader downloader,
ResourceDownloaderException e )
{
result = e;
done_sem.release();
informFailed(e);
}
}