001/*
002 * (C) Copyright 2006-2011 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 *     Thierry Delprat
018 *     Florent Guillaume
019 */
020
021package org.nuxeo.ecm.core.api.blobholder;
022
023import java.io.IOException;
024import java.io.InputStream;
025import java.util.ArrayList;
026import java.util.Calendar;
027import java.util.List;
028
029import org.apache.commons.codec.digest.DigestUtils;
030import org.apache.commons.io.IOUtils;
031import org.nuxeo.ecm.core.api.Blob;
032import org.nuxeo.ecm.core.api.NuxeoException;
033
034/**
035 * Base class for {@link BlobHolder} implementers
036 */
037public abstract class AbstractBlobHolder implements BlobHolder {
038
039    @Override
040    public abstract Blob getBlob();
041
042    @Override
043    public void setBlob(Blob blob) {
044        throw new UnsupportedOperationException();
045    }
046
047    @Override
048    public List<Blob> getBlobs() {
049        List<Blob> blobs = null;
050
051        Blob blob = getBlob();
052        if (blob != null) {
053            blobs = new ArrayList<Blob>();
054            blobs.add(blob);
055        }
056
057        return blobs;
058    }
059
060    protected abstract String getBasePath();
061
062    @Override
063    public String getFilePath() {
064        String path = getBasePath();
065
066        Blob blob = getBlob();
067        if (blob != null) {
068            path = path + "/" + blob.getFilename();
069        }
070
071        return path;
072    }
073
074    @Override
075    public String getHash() {
076
077        Blob blob = getBlob();
078        if (blob != null) {
079            String h = blob.getDigest();
080            if (h == null) {
081                h = getMD5Digest();
082                blob.setDigest(h);
083            }
084            return h;
085        }
086        return "NullBlob";
087    }
088
089    protected String getMD5Digest() {
090        try (InputStream in = getBlob().getStream()) {
091            return DigestUtils.md5Hex(in);
092        } catch (IOException e) {
093            throw new NuxeoException(e);
094        }
095    }
096
097    @Override
098    public abstract Calendar getModificationDate();
099
100}