/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-07 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id: XmlrpcDownload.java 223 2007-04-21 22:13:05Z dizzzz $
*/
package org.exist.protocolhandler.xmlrpc;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Vector;
import java.net.URL;
import org.apache.log4j.Logger;
import org.apache.xmlrpc.client.XmlRpcClient;
import org.apache.xmlrpc.client.XmlRpcClientConfigImpl;
import org.exist.protocolhandler.xmldb.XmldbURL;
import org.exist.storage.io.ExistIOException;
/**
* Read document from using XMLRPC from remote database and write the data
* into an output stream.
*
* @author Dannes Wessels
*/
public class XmlrpcDownload {
private final static Logger LOG = Logger.getLogger(XmlrpcDownload.class);
/**
* Write document referred by the URL to the output stream.
*
*
* @param xmldbURL Document location in database.
* @param os Stream to which the document is written.
* @throws ExistIOException
*/
public void stream(XmldbURL xmldbURL, OutputStream os) throws IOException {
LOG.debug("Begin document download");
try {
XmlRpcClient client = new XmlRpcClient();
XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
config.setEncoding("UTF-8");
config.setEnabledForExtensions(true);
config.setServerURL(new URL(xmldbURL.getXmlRpcURL()));
// Setup client client
if(xmldbURL.hasUserInfo()) {
config.setBasicUserName(xmldbURL.getUsername());
config.setBasicPassword(xmldbURL.getPassword());
}
client.setConfig(config);
// Setup xml serializer
Hashtable options = new Hashtable();
options.put("indent", "no");
options.put("encoding", "UTF-8");
// Setup client parameters
Vector params = new Vector();
params.addElement( xmldbURL.getCollectionPath() );
params.addElement( options );
// Shoot first method write data
Hashtable ht = (Hashtable) client.execute("getDocumentData", params);
int offset = ((Integer)ht.get("offset")).intValue();
byte[]data= (byte[]) ht.get("data");
String handle = (String) ht.get("handle");
os.write(data);
// When there is more data to download
while(offset!=0){
// Clean and re-setup client parameters
params.clear();
params.addElement(handle);
params.addElement(new Integer(offset));
// Get and write next chunk
ht = (Hashtable) client.execute("getNextChunk", params);
data= (byte[]) ht.get("data");
offset = ((Integer)ht.get("offset")).intValue();
os.write(data);
}
} catch (IOException ex) {
LOG.error(ex);
throw ex;
} catch (Exception ex) {
LOG.error(ex);
throw new ExistIOException(ex.getMessage(), ex);
} finally {
LOG.debug("Finished document download");
}
}
}