001/*
002 * (C) Copyright 2006-2010 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.automation.client.model;
020
021import java.io.IOException;
022import java.io.InputStream;
023
024import org.nuxeo.ecm.automation.client.Session;
025
026/**
027 * @author <a href="mailto:[email protected]">Bogdan Stefanescu</a>
028 */
029public class BlobRef extends Blob {
030
031    private static final long serialVersionUID = 1L;
032
033    protected String ref;
034
035    protected volatile Blob blob;
036
037    protected transient Session session;
038
039    public BlobRef(String ref) {
040        this.ref = ref;
041    }
042
043    public void attach(Session session) {
044        this.session = session;
045    }
046
047    public Session session() {
048        return session;
049    }
050
051    public String getRef() {
052        return ref;
053    }
054
055    @Override
056    public InputStream getStream() throws IOException {
057        if (blob == null) {
058            synchronized (this) {
059                if (blob == null) {
060                    blob = session.getFile(ref);
061                }
062            }
063        }
064        return blob.getStream();
065    }
066
067}