001/*
002 * (C) Copyright 2015 Nuxeo SA (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-2.1.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 *      Nelson Silva
016 */
017package org.nuxeo.ecm.liveconnect.google.drive.converter;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.io.Serializable;
022import java.util.Map;
023
024import org.nuxeo.ecm.core.api.Blob;
025import org.nuxeo.ecm.core.api.Blobs;
026import org.nuxeo.ecm.core.api.DocumentModel;
027import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
028import org.nuxeo.ecm.core.api.blobholder.DocumentBlobHolder;
029import org.nuxeo.ecm.core.blob.BlobManager;
030import org.nuxeo.ecm.core.convert.api.ConversionException;
031import org.nuxeo.ecm.core.convert.cache.SimpleCachableBlobHolder;
032import org.nuxeo.ecm.core.convert.extension.Converter;
033import org.nuxeo.ecm.core.convert.extension.ConverterDescriptor;
034import org.nuxeo.runtime.api.Framework;
035
036/**
037 * Converter that relies on {@link org.nuxeo.ecm.core.blob.BlobProvider} conversions.
038 *
039 * @since 7.3
040 */
041public class GoogleDriveBlobConverter implements Converter {
042
043    protected ConverterDescriptor descriptor;
044
045    @Override
046    public void init(ConverterDescriptor descriptor) {
047        this.descriptor = descriptor;
048    }
049
050    @Override
051    public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException {
052
053        Blob srcBlob, dstBlob;
054
055        srcBlob = blobHolder.getBlob();
056        if (srcBlob == null) {
057            return null;
058        }
059
060        try {
061            DocumentModel doc = null;
062            if (blobHolder instanceof DocumentBlobHolder) {
063                doc = ((DocumentBlobHolder) blobHolder).getDocument();
064            }
065            dstBlob = convert(srcBlob, doc);
066        } catch (IOException e) {
067            throw new ConversionException("Unable to fetch conversion", e);
068        }
069
070        if (dstBlob == null) {
071            return null;
072        }
073
074        return new SimpleCachableBlobHolder(dstBlob);
075    }
076
077    protected Blob convert(Blob blob, DocumentModel doc) throws IOException {
078        String mimetype = descriptor.getDestinationMimeType();
079        InputStream is = Framework.getService(BlobManager.class).getConvertedStream(blob, mimetype, doc);
080        return is == null ? null : Blobs.createBlob(is, mimetype);
081    }
082}