001/*
002 * (C) Copyright 2006-2008 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 *     Nuxeo - initial API and implementation
018 *
019 * $Id$
020 *
021 */
022package org.nuxeo.ecm.platform.pictures.tiles.api.imageresource;
023
024import java.util.Calendar;
025
026import org.nuxeo.ecm.core.api.Blob;
027import org.nuxeo.ecm.core.api.DocumentModel;
028import org.nuxeo.ecm.core.api.PropertyException;
029
030/**
031 * DocumentModel-based implementation of ImageResource. Supports clean digest and modification date to have a clean
032 * invalidation system.
033 *
034 * @author tiry
035 */
036public class DocumentImageResource implements ImageResource {
037
038    private static final long serialVersionUID = 1L;
039
040    protected Blob blob;
041
042    protected String hash;
043
044    protected Calendar modified;
045
046    protected DocumentModel doc;
047
048    protected String xPath;
049
050    protected String fileName;
051
052    public DocumentImageResource(DocumentModel doc, String xPath) {
053        this.doc = doc;
054        this.xPath = xPath;
055    }
056
057    protected String getEscapedxPath(String xPath) {
058        String clean = xPath.replace(":", "_");
059        clean = clean.replace("/", "_");
060        clean = clean.replace("[", "");
061        clean = clean.replace("]", "");
062        return clean;
063    }
064
065    protected void compute() throws PropertyException {
066
067        blob = (Blob) doc.getProperty(xPath).getValue();
068        modified = (Calendar) doc.getProperty("dublincore", "modified");
069
070        hash = blob.getDigest();
071        if (hash == null) {
072            hash = doc.getRepositoryName() + "_" + doc.getId() + "_" + getEscapedxPath(xPath);
073            if (modified != null) {
074                hash = hash + "_" + modified.getTimeInMillis();
075            }
076        }
077    }
078
079    public Blob getBlob() {
080        if (blob == null) {
081            compute();
082        }
083        if (fileName != null) {
084            blob.setFilename(fileName);
085        }
086        return blob;
087    }
088
089    public String getHash() {
090        if (hash == null) {
091            compute();
092        }
093        return hash;
094    }
095
096    public Calendar getModificationDate() {
097        if (modified == null) {
098            compute();
099        }
100        return modified;
101    }
102
103    public void setFileName(String name) {
104        this.fileName = name;
105    }
106
107}