001/*
002 * (C) Copyright 2002-2012 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.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 *     Antoine Taillefer
016 */
017package org.nuxeo.ecm.core.convert.plugins.text.extractors;
018
019import java.io.IOException;
020import java.io.Serializable;
021import java.util.Map;
022
023import org.apache.commons.logging.Log;
024import org.apache.commons.logging.LogFactory;
025import org.nuxeo.ecm.core.api.Blob;
026import org.nuxeo.ecm.core.api.Blobs;
027import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
028import org.nuxeo.ecm.core.api.impl.blob.StringBlob;
029import org.nuxeo.ecm.core.convert.api.ConversionException;
030import org.nuxeo.ecm.core.convert.cache.SimpleCachableBlobHolder;
031import org.nuxeo.ecm.core.convert.extension.Converter;
032import org.nuxeo.ecm.core.convert.extension.ConverterDescriptor;
033
034/**
035 * Markdown to text converter.
036 * <p>
037 * It basically returns a {@link StringBlob} with the markdown text and the plain/text mime type.
038 *
039 * @author Antoine Taillefer (ataillefer@nuxeo.com)
040 * @since 5.6
041 */
042public class MD2TextConverter implements Converter {
043
044    private static final Log LOGGER = LogFactory.getLog(MD2TextConverter.class);
045
046    @Override
047    public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException {
048
049        try {
050            Blob blob = blobHolder.getBlob();
051            if (blob == null) {
052                LOGGER.warn("Trying to convert a blobHolder that has a null blob. Nothing to do, returning the blobHolder.");
053                return blobHolder;
054            }
055            String text = blob.getString();
056            return new SimpleCachableBlobHolder(Blobs.createBlob(text));
057        } catch (IOException e) {
058            throw new ConversionException("Error during MD2Text conversion", e);
059        }
060    }
061
062    @Override
063    public void init(ConverterDescriptor descriptor) {
064    }
065
066}