EDIT

package eu.etaxonomy.cdm.common;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.io.Reader;

import java.io.UnsupportedEncodingException;

import org.apache.maven.doxia.module.apt.AptParser;

import org.apache.maven.doxia.module.xhtml.XhtmlSinkFactory;

import org.apache.maven.doxia.parser.ParseException;

import org.apache.maven.doxia.parser.Parser;

import org.apache.maven.doxia.sink.Sink;

import org.apache.maven.doxia.sink.SinkFactory;

import org.codehaus.plexus.DefaultPlexusContainer;

import org.codehaus.plexus.PlexusContainer;

import org.codehaus.plexus.PlexusContainerException;

import org.codehaus.plexus.component.repository.exception.ComponentLookupException;

import org.codehaus.plexus.util.ReaderFactory;

/**

 * The utility class which provides methods relating to documentation.

 *

 * @author c.mathew

 * @since 01-Aug-2012

 */

public class DocUtils {

    /**

     * Converts an apt file into html.

     *

     * @param aptFile apt file

     *

     * @return html as string or error message if exception

     *

     */

    public static String convertAptToHtml(File aptFile) {

        PlexusContainer container;

        try {

            container = new DefaultPlexusContainer();

        } catch (PlexusContainerException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        //FIXME : Plexus does not seem to work for looking up Sink Factory, so XhtmlSinkFactory is called directory

        //SinkFactory sinkFactory = (SinkFactory) container.lookup( SinkFactory.ROLE, "html" ); // Plexus lookup

        SinkFactory sinkFactory = new XhtmlSinkFactory();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        Sink sink;

        try {

            sink = sinkFactory.createSink(baos);

        } catch (IOException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        AptParser parser;

        try {

            parser = (AptParser)container.lookup(Parser.ROLE, "apt");

        } catch (ComponentLookupException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        Reader reader;

        try {

            reader = ReaderFactory.newReader( aptFile, "UTF-8" );

        } catch (FileNotFoundException e) {

            return "Error in generating documentation : " + e.getMessage();

        } catch (UnsupportedEncodingException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        try {

            parser.parse( reader, sink );

        } catch (ParseException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        return baos.toString();

    }

    /**

     * Converts an apt input stream into html.

     *

     * @param aptInputStream apt input stream

     *

     * @return html as string or error message if exception

     *

     */

    public static String convertAptToHtml(InputStream aptInputStream) {

        PlexusContainer container;

        try {

            container = new DefaultPlexusContainer();

        } catch (PlexusContainerException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        //FIXME : Plexus does not seem to work for looking up Sink Factory, so XhtmlSinkFactory is called directory

        //SinkFactory sinkFactory = (SinkFactory) container.lookup( SinkFactory.ROLE, "html" ); // Plexus lookup

        SinkFactory sinkFactory = new XhtmlSinkFactory();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        Sink sink;

        try {

            sink = sinkFactory.createSink(baos);

        } catch (IOException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        AptParser parser;

        try {

            parser = (AptParser)container.lookup(Parser.ROLE, "apt");

        } catch (ComponentLookupException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        Reader reader;

        try {

            reader = ReaderFactory.newReader( aptInputStream, "UTF-8" );

        } catch (UnsupportedEncodingException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        try {

            parser.parse( reader, sink );

        } catch (ParseException e) {

            return "Error in generating documentation : " + e.getMessage();

        }

        return baos.toString();

    }

}