org.exist.xquery.modules.httpclient.DBFile.java Source code

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Here is the source code for org.exist.xquery.modules.httpclient.DBFile.java

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/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2010 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 program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *  
 *  $Id$
 */
package org.exist.xquery.modules.httpclient;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.apache.commons.httpclient.methods.multipart.PartSource;
import org.exist.EXistException;
import org.exist.security.Subject;
import org.exist.storage.BrokerPool;
import org.exist.storage.DBBroker;
import org.exist.xmldb.XmldbURI;

/**
 * @author <a href="mailto:shabanovd@gmail.com">Dmitriy Shabanov</a>
 *
 */
public class DBFile implements PartSource {

    private XmldbURI uri;

    private URLConnection connection = null;

    public DBFile(String uri) {
        this.uri = XmldbURI.create(uri);
    }

    private URLConnection getConnection() throws IOException {
        if (connection == null) {
            BrokerPool database = null;
            DBBroker broker = null;
            try {
                database = BrokerPool.getInstance();
                broker = database.get(null);
                Subject subject = broker.getSubject();

                URL url = new URL("xmldb:exist://jsessionid:" + subject.getSessionId() + "@" + uri.toString());
                connection = url.openConnection();
            } catch (IllegalArgumentException e) {
                throw new IOException(e);
            } catch (MalformedURLException e) {
                throw new IOException(e);
            } catch (EXistException e) {
                throw new IOException(e);
            } finally {
                if (database != null)
                    database.release(broker);
            }
        }
        return connection;
    }

    /* (non-Javadoc)
     * @see org.apache.commons.httpclient.methods.multipart.PartSource#createInputStream()
     */
    @Override
    public InputStream createInputStream() throws IOException {
        return getConnection().getInputStream();
    }

    /* (non-Javadoc)
     * @see org.apache.commons.httpclient.methods.multipart.PartSource#getFileName()
     */
    @Override
    public String getFileName() {
        return uri.lastSegment().toString();
    }

    /* (non-Javadoc)
     * @see org.apache.commons.httpclient.methods.multipart.PartSource#getLength()
     */
    @Override
    public long getLength() {
        try {
            return getConnection().getContentLength();
        } catch (IOException e) {
            return 0;
        }
    }

}