001/*
002 * (C) Copyright 2006-2010 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     bstefanescu
016 */
017package org.nuxeo.ecm.automation.client.model;
018
019import java.io.IOException;
020import java.io.InputStream;
021
022import org.nuxeo.ecm.automation.client.Session;
023
024/**
025 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
026 */
027public class BlobRef extends Blob {
028
029    private static final long serialVersionUID = 1L;
030
031    protected String ref;
032
033    protected volatile Blob blob;
034
035    protected transient Session session;
036
037    public BlobRef(String ref) {
038        this.ref = ref;
039    }
040
041    public void attach(Session session) {
042        this.session = session;
043    }
044
045    public Session session() {
046        return session;
047    }
048
049    public String getRef() {
050        return ref;
051    }
052
053    @Override
054    public InputStream getStream() throws IOException {
055        if (blob == null) {
056            synchronized (this) {
057                if (blob == null) {
058                    blob = session.getFile(ref);
059                }
060            }
061        }
062        return blob.getStream();
063    }
064
065}