001/*
002 * (C) Copyright 2006-2018 Nuxeo (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.diff.content.converters;
020
021import java.io.IOException;
022import java.io.Serializable;
023import java.util.Map;
024
025import org.apache.commons.lang3.StringUtils;
026import org.nuxeo.ecm.core.api.Blob;
027import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
028import org.nuxeo.ecm.core.convert.api.ConversionException;
029import org.nuxeo.ecm.core.convert.api.ConverterNotRegistered;
030
031/**
032 * Text converter for content diff.
033 * <p>
034 * Uses the "any2text" converter.
035 *
036 * @author Antoine Taillefer ([email protected])
037 * @since 5.6
038 */
039public class ContentDiffTextConverter extends AbstractContentDiffConverter {
040
041    private static final String ANY_2_TEXT_CONVERTER_NAME = "any2text";
042
043    public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException {
044
045        BlobHolder convertedBlobHolder = convert(ANY_2_TEXT_CONVERTER_NAME, blobHolder, parameters);
046
047        String convertedBlobString = null;
048        try {
049            Blob convertedBlob = convertedBlobHolder.getBlob();
050            if (convertedBlob != null) {
051                convertedBlobString = convertedBlob.getString();
052            }
053        } catch (IOException e) {
054            throw new ConversionException("Error while getting converted blob string.");
055        }
056        if (StringUtils.isEmpty(convertedBlobString)) {
057            // Converted blob is an empty string, this means no text
058            // converter was found (see FullTextConverter). Throw
059            // appropriate exception.
060            String srcMimeType = null;
061            Blob blob = blobHolder.getBlob();
062            if (blob != null) {
063                srcMimeType = blob.getMimeType();
064            }
065            throw new ConverterNotRegistered(
066                    String.format("for sourceMimeType = %s, destinationMimeType = text/plain", srcMimeType));
067        }
068        return convertedBlobHolder;
069    }
070
071}