001/* 002 * (C) Copyright 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 * Contributors: 014 * Nuxeo - initial API and implementation 015 */ 016 017package org.nuxeo.ecm.platform.rendition.impl; 018 019import java.util.List; 020 021import org.nuxeo.ecm.core.api.Blob; 022import org.nuxeo.ecm.platform.rendition.Rendition; 023import org.nuxeo.ecm.platform.rendition.service.RenditionDefinition; 024 025/** 026 * Implementation of the {@link Rendition} interface that allows lazy computation of the rendition Blobs 027 * 028 * @author <a href="mailto:tdelprat@nuxeo.com">Tiry</a> 029 */ 030public abstract class LazyRendition extends AbstractRendition implements Rendition { 031 032 protected List<Blob> blobs = null; 033 034 public LazyRendition(RenditionDefinition definition) { 035 super(definition); 036 } 037 038 public Blob getBlob() { 039 List<Blob> blobs = getBlobs(); 040 if (blobs != null && blobs.size() > 0) { 041 return blobs.get(0); 042 } 043 return null; 044 } 045 046 @Override 047 public List<Blob> getBlobs() { 048 if (blobs == null) { 049 blobs = computeRenditionBlobs(); 050 } 051 return blobs; 052 } 053 054 protected abstract List<Blob> computeRenditionBlobs(); 055 056}