001/*
002 * (C) Copyright 2006-2012 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 *     Antoine Taillefer
018 */
019package org.nuxeo.ecm.core.convert.plugins.text.extractors;
020
021import java.io.IOException;
022import java.io.Serializable;
023import java.util.Map;
024
025import org.apache.commons.logging.Log;
026import org.apache.commons.logging.LogFactory;
027import org.nuxeo.ecm.core.api.Blob;
028import org.nuxeo.ecm.core.api.Blobs;
029import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
030import org.nuxeo.ecm.core.api.impl.blob.StringBlob;
031import org.nuxeo.ecm.core.convert.api.ConversionException;
032import org.nuxeo.ecm.core.convert.cache.SimpleCachableBlobHolder;
033import org.nuxeo.ecm.core.convert.extension.Converter;
034import org.nuxeo.ecm.core.convert.extension.ConverterDescriptor;
035
036/**
037 * Markdown to text converter.
038 * <p>
039 * It basically returns a {@link StringBlob} with the markdown text and the plain/text mime type.
040 *
041 * @author Antoine Taillefer (ataillefer@nuxeo.com)
042 * @since 5.6
043 */
044public class MD2TextConverter implements Converter {
045
046    private static final Log LOGGER = LogFactory.getLog(MD2TextConverter.class);
047
048    @Override
049    public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException {
050
051        try {
052            Blob blob = blobHolder.getBlob();
053            if (blob == null) {
054                LOGGER.warn(
055                        "Trying to convert a blobHolder that has a null blob. Nothing to do, returning the blobHolder.");
056                return blobHolder;
057            }
058            String text = blob.getString();
059            return new SimpleCachableBlobHolder(Blobs.createBlob(text));
060        } catch (IOException e) {
061            throw new ConversionException("Error during MD2Text conversion", blobHolder, e);
062        }
063    }
064
065    @Override
066    public void init(ConverterDescriptor descriptor) {
067    }
068
069}