eXo Platform 3.5

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## Chapter 81. Tika Document Reader Service

## Intro

DocumentReaderService provides API to retrieve DocumentReader by mimetype.

DocumentReader lets the user fetch content of document as String or, in case of TikaDocumentReader, as Reader.

## Architecture

Basicaly, DocumentReaderService is a container for all registered DocumentReaders. So, you can register DocumentReader (method addDocumentReader(ComponentPlugin reader)) and fetch DocumentReader by mimeType (method getDocumentReader(String mimeType)).

TikaDocumentReaderServiceImpl extends DocumentReaderService with simple goal - read Tika configuration and lazy register each Tika Parser as TikaDocumentReader.

### Note

By default, all Tikas Parsers are not registered in readers <mimetype, DocumentReader> map. When user tries to fetch a DocumentReader by unknown mimetype. Than TikaDocumentReaderService checks tika configuration, and register a new mimetype-DocumentReader pair.

## Configuration

How TikaDocumentReaderService Impl configuration looks like:

    <component>

          <key>org.exoplatform.services.document.DocumentReaderService</key>

          <type>org.exoplatform.services.document.impl.tika.TikaDocumentReaderServiceImpl</type>

          <!-- Old-style document readers -->

          <component-plugins>

             <component-plugin>

                <name>pdf.document.reader</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.PDFDocumentReader</type>

                <description>to read the pdf inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>document.readerMSWord</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.MSWordDocumentReader</type>

                <description>to read the ms word inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>document.readerMSXWord</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.MSXWordDocumentReader</type>

                <description>to read the ms word inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>document.readerMSExcel</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.MSExcelDocumentReader</type>

                <description>to read the ms excel inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>document.readerMSXExcel</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.MSXExcelDocumentReader</type>

                <description>to read the ms excel inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>document.readerMSOutlook</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.MSOutlookDocumentReader</type>

                <description>to read the ms outlook inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>PPTdocument.reader</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.PPTDocumentReader</type>

                <description>to read the ms ppt inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>MSXPPTdocument.reader</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.MSXPPTDocumentReader</type>

                <description>to read the ms pptx inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>document.readerHTML</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.HTMLDocumentReader</type>

                <description>to read the html inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>document.readerXML</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.XMLDocumentReader</type>

                <description>to read the xml inputstream</description>

             </component-plugin>

             <component-plugin>

                <name>TPdocument.reader</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.TextPlainDocumentReader</type>

                <description>to read the plain text inputstream</description>

                <init-params>

                   <!--

                      values-param> <name>defaultEncoding</name> <description>description</description> <value>UTF-8</value>

                      </values-param

                   -->

                </init-params>

             </component-plugin>

             <component-plugin>

                <name>document.readerOO</name>

                <set-method>addDocumentReader</set-method>

                <type>org.exoplatform.services.document.impl.OpenOfficeDocumentReader</type>

                <description>to read the OO inputstream</description>

             </component-plugin>

          </component-plugins>

          <init-params>

            <value-param>

              <name>tika-configuration</name>

              <value>jar:/conf/portal/tika-config.xml</value>

            </value-param>

          </init-params>

       </component>

    </configuration>

tika-config.xml example:

    <properties>

      <mimeTypeRepository magic="false"/>

      <parsers>

        <parser name="parse-dcxml" class="org.apache.tika.parser.xml.DcXMLParser">

          <mime>application/xml</mime>

          <mime>image/svg+xml</mime>

          <mime>text/xml</mime>

          <mime>application/x-google-gadget</mime>

        </parser>

        <parser name="parse-office" class="org.apache.tika.parser.microsoft.OfficeParser">

          <mime>application/excel</mime>

          <mime>application/xls</mime>

          <mime>application/msworddoc</mime>

          <mime>application/msworddot</mime>

          <mime>application/powerpoint</mime>

          <mime>application/ppt</mime>

          <mime>application/x-tika-msoffice</mime>

          <mime>application/msword</mime>

          <mime>application/vnd.ms-excel</mime>

          <mime>application/vnd.ms-excel.sheet.binary.macroenabled.12</mime>

          <mime>application/vnd.ms-powerpoint</mime>

          <mime>application/vnd.visio</mime>

          <mime>application/vnd.ms-outlook</mime>

        </parser>

        <parser name="parse-ooxml" class="org.apache.tika.parser.microsoft.ooxml.OOXMLParser">

          <mime>application/x-tika-ooxml</mime>

          <mime>application/vnd.openxmlformats-package.core-properties+xml</mime>

          <mime>application/vnd.openxmlformats-officedocument.spreadsheetml.sheet</mime>

          <mime>application/vnd.openxmlformats-officedocument.spreadsheetml.template</mime>

          <mime>application/vnd.ms-excel.sheet.macroenabled.12</mime>

          <mime>application/vnd.ms-excel.template.macroenabled.12</mime>

          <mime>application/vnd.ms-excel.addin.macroenabled.12</mime>

          <mime>application/vnd.openxmlformats-officedocument.presentationml.presentation</mime>

          <mime>application/vnd.openxmlformats-officedocument.presentationml.template</mime>

          <mime>application/vnd.openxmlformats-officedocument.presentationml.slideshow</mime>

          <mime>application/vnd.ms-powerpoint.presentation.macroenabled.12</mime>

          <mime>application/vnd.ms-powerpoint.slideshow.macroenabled.12</mime>

          <mime>application/vnd.ms-powerpoint.addin.macroenabled.12</mime>

          <mime>application/vnd.openxmlformats-officedocument.wordprocessingml.document</mime>

          <mime>application/vnd.openxmlformats-officedocument.wordprocessingml.template</mime>

          <mime>application/vnd.ms-word.document.macroenabled.12</mime>

          <mime>application/vnd.ms-word.template.macroenabled.12</mime>

        </parser>

        <parser name="parse-html" class="org.apache.tika.parser.html.HtmlParser">

          <mime>text/html</mime>

        </parser>

        <parser mame="parse-rtf" class="org.apache.tika.parser.rtf.RTFParser">

          <mime>application/rtf</mime>

        </parser>

        <parser name="parse-pdf" class="org.apache.tika.parser.pdf.PDFParser">

          <mime>application/pdf</mime>

        </parser>

        <parser name="parse-txt" class="org.apache.tika.parser.txt.TXTParser">

          <mime>text/plain</mime>

          <mime>script/groovy</mime>

          <mime>application/x-groovy</mime>

          <mime>application/x-javascript</mime>

          <mime>application/javascript</mime>

          <mime>text/javascript</mime>

        </parser>

        <parser name="parse-openoffice" class="org.apache.tika.parser.opendocument.OpenOfficeParser">

          <mime>application/vnd.oasis.opendocument.database</mime>

          <mime>application/vnd.sun.xml.writer</mime>

          <mime>application/vnd.oasis.opendocument.text</mime>

          <mime>application/vnd.oasis.opendocument.graphics</mime>

          <mime>application/vnd.oasis.opendocument.presentation</mime>

          <mime>application/vnd.oasis.opendocument.spreadsheet</mime>

          <mime>application/vnd.oasis.opendocument.chart</mime>

          <mime>application/vnd.oasis.opendocument.image</mime>

          <mime>application/vnd.oasis.opendocument.formula</mime>

          <mime>application/vnd.oasis.opendocument.text-master</mime>

          <mime>application/vnd.oasis.opendocument.text-web</mime>

          <mime>application/vnd.oasis.opendocument.text-template</mime>

          <mime>application/vnd.oasis.opendocument.graphics-template</mime>

          <mime>application/vnd.oasis.opendocument.presentation-template</mime>

          <mime>application/vnd.oasis.opendocument.spreadsheet-template</mime>

          <mime>application/vnd.oasis.opendocument.chart-template</mime>

          <mime>application/vnd.oasis.opendocument.image-template</mime>

          <mime>application/vnd.oasis.opendocument.formula-template</mime>

          <mime>application/x-vnd.oasis.opendocument.text</mime>

          <mime>application/x-vnd.oasis.opendocument.graphics</mime>

          <mime>application/x-vnd.oasis.opendocument.presentation</mime>

          <mime>application/x-vnd.oasis.opendocument.spreadsheet</mime>

          <mime>application/x-vnd.oasis.opendocument.chart</mime>

          <mime>application/x-vnd.oasis.opendocument.image</mime>

          <mime>application/x-vnd.oasis.opendocument.formula</mime>

          <mime>application/x-vnd.oasis.opendocument.text-master</mime>

          <mime>application/x-vnd.oasis.opendocument.text-web</mime>

          <mime>application/x-vnd.oasis.opendocument.text-template</mime>

          <mime>application/x-vnd.oasis.opendocument.graphics-template</mime>

          <mime>application/x-vnd.oasis.opendocument.presentation-template</mime>

          <mime>application/x-vnd.oasis.opendocument.spreadsheet-template</mime>

          <mime>application/x-vnd.oasis.opendocument.chart-template</mime>

          <mime>application/x-vnd.oasis.opendocument.image-template</mime>

          <mime>application/x-vnd.oasis.opendocument.formula-template</mime>

        </parser>

        <parser name="parse-image" class="org.apache.tika.parser.image.ImageParser">

          <mime>image/bmp</mime>

          <mime>image/gif</mime>

          <mime>image/jpeg</mime>

          <mime>image/png</mime>

          <mime>image/tiff</mime>

          <mime>image/vnd.wap.wbmp</mime>

          <mime>image/x-icon</mime>

          <mime>image/x-psd</mime>

          <mime>image/x-xcf</mime>

        </parser>

        <parser name="parse-class" class="org.apache.tika.parser.asm.ClassParser">

          <mime>application/x-tika-java-class</mime>

        </parser>

        <parser name="parse-mp3" class="org.apache.tika.parser.mp3.Mp3Parser">

          <mime>audio/mpeg</mime>

        </parser>

        <parser name="parse-midi" class="org.apache.tika.parser.audio.MidiParser">

          <mime>application/x-midi</mime>

          <mime>audio/midi</mime>

        </parser>

        <parser name="parse-audio" class="org.apache.tika.parser.audio.AudioParser">

          <mime>audio/basic</mime>

          <mime>audio/x-wav</mime>

          <mime>audio/x-aiff</mime>

        </parser>

      </parsers>

    </properties>

## Old-style DocumentReaders and Tika Parsers

As you see configuration above, there is both old-style DocumentReaders and new Tika parsers registered.

But MSWordDocumentReader and org.apache.tika.parser.microsoft.OfficeParser both refer to same "application/msword" mimetype, exclaims attentive reader. And he is right. But only one DocumentReader will be fetched.

Old-style DocumentReader registered in configuration become registered into DocumentReaderService. So, mimetypes that is supported by those DocumentReaders will have a registered pair, and user will always fetch this DocumentReaders with getDocumentReader(..) method. Tika configuration will be checked for Parsers only if there is no already registered DocumentReader.

### How to make and register own DocumentReader

You can make you own DocumentReader in two ways.

Old-Style Document Reader:

- extend BaseDocumentReader

    public class MyDocumentReader extends BaseDocumentReader

    {

       public String[] getMimeTypes()

       {

          return new String[]{"mymimetype"};

       }

       ...

    }

- register it as component-plugin

    <component-plugin>

       <name>my.DocumentReader</name>

       <set-method>addDocumentReader</set-method>

       <type>com.mycompany.document.MyDocumentReader</type>

       <description>to read my own file format</description>

    </component-plugin>

Tika Parser:

- implement Parser

    public class MyParser implements Parser

    {

       ...

    }

- register it in tika-config.xml

     <parser name="parse-mydocument" class="com.mycompany.document.MyParser">

          <mime>mymimetype</mime>

     </parser>

## TikaDocumentReader features and notes

TikaDocumentReader features and notes:

- TikaDocumentReader may return document contant as Reader object. Old-Style DocumentReader does not;

- TikaDocumentReader do not detects document mimetipe. You will get exact parser as configured in tika-config;

- All readers methods closes InputStream at final.

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