001/*
002 * (C) Copyright 2015-2016 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 *      Nelson Silva
018 */
019package org.nuxeo.ecm.liveconnect.google.drive.converter;
020
021import java.io.IOException;
022import java.io.InputStream;
023import java.io.Serializable;
024import java.util.Map;
025
026import org.nuxeo.ecm.core.api.Blob;
027import org.nuxeo.ecm.core.api.Blobs;
028import org.nuxeo.ecm.core.api.DocumentModel;
029import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
030import org.nuxeo.ecm.core.api.blobholder.DocumentBlobHolder;
031import org.nuxeo.ecm.core.blob.DocumentBlobManager;
032import org.nuxeo.ecm.core.convert.api.ConversionException;
033import org.nuxeo.ecm.core.convert.cache.SimpleCachableBlobHolder;
034import org.nuxeo.ecm.core.convert.extension.Converter;
035import org.nuxeo.ecm.core.convert.extension.ConverterDescriptor;
036import org.nuxeo.runtime.api.Framework;
037
038/**
039 * Converter that relies on {@link org.nuxeo.ecm.core.blob.BlobProvider} conversions.
040 *
041 * @since 7.3
042 */
043public class GoogleDriveBlobConverter implements Converter {
044
045    protected ConverterDescriptor descriptor;
046
047    @Override
048    public void init(ConverterDescriptor descriptor) {
049        this.descriptor = descriptor;
050    }
051
052    @Override
053    public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException {
054
055        Blob srcBlob, dstBlob;
056
057        srcBlob = blobHolder.getBlob();
058        if (srcBlob == null) {
059            return null;
060        }
061
062        try {
063            DocumentModel doc = null;
064            if (blobHolder instanceof DocumentBlobHolder) {
065                doc = ((DocumentBlobHolder) blobHolder).getDocument();
066            }
067            dstBlob = convert(srcBlob, doc);
068        } catch (IOException e) {
069            throw new ConversionException("Unable to fetch conversion", e);
070        }
071
072        if (dstBlob == null) {
073            return null;
074        }
075
076        return new SimpleCachableBlobHolder(dstBlob);
077    }
078
079    protected Blob convert(Blob blob, DocumentModel doc) throws IOException {
080        String mimetype = descriptor.getDestinationMimeType();
081        InputStream is = Framework.getService(DocumentBlobManager.class).getConvertedStream(blob, mimetype, doc);
082        return is == null ? null : Blobs.createBlob(is, mimetype);
083    }
084}