org.sakaiproject.search.component.adapter.contenthosting.TikaContentDigester.java Source code

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Here is the source code for org.sakaiproject.search.component.adapter.contenthosting.TikaContentDigester.java

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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.opensource.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **********************************************************************************/
package org.sakaiproject.search.component.adapter.contenthosting;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.content.api.ContentResource;
import org.xml.sax.ContentHandler;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.sax.BodyContentHandler;

/**
 * @author stephen.marquard@uct.ac.za
 */
public class TikaContentDigester extends BaseContentDigester {
    private static Log log = LogFactory.getLog(TikaContentDigester.class);

    /*
     * (non-Javadoc)
     * 
     * @see org.sakaiproject.search.component.adapter.contenthosting.BaseContentDigester#getContent(org.sakaiproject.content.api.ContentResource)
     */

    public String getContent(ContentResource contentResource) {
        log.debug("Digesting with TikaContentDigester");
        if (contentResource == null) {
            throw new RuntimeException("Null contentResource passed to getContent");
        }

        InputStream contentStream = null;

        try {
            contentStream = contentResource.streamContent();

            Metadata metadata = new Metadata();

            metadata.set(Metadata.CONTENT_TYPE, contentResource.getContentType());
            ContentHandler handler = new BodyContentHandler();
            Parser parser = new AutoDetectParser();

            parser.parse(contentStream, handler, metadata, new ParseContext());
            return handler.toString();
        } catch (Exception e) {
            log.debug("Cannot index", e);
            throw new RuntimeException("Failed to read content for indexing ", e);
        } finally {
            if (contentStream != null) {
                try {
                    contentStream.close();
                } catch (IOException e) {
                    log.debug(e);
                }
            }
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.sakaiproject.search.component.adapter.contenthosting.BaseContentDigester#getContentReader(org.sakaiproject.content.api.ContentResource)
     */

    public Reader getContentReader(ContentResource contentResource) {
        return new StringReader(getContent(contentResource));
    }

}