Using POI transformer to transform excel documents

darkstar1 — Mon, 18 Jan 2016 09:48:15 GMT

So I am trying to use the POI transformer to transform EXCEL => HTML.So I have the following: In <Project-home>/src/main/amp/config/alfresco/extension/subsystems/Transformers/default/default/transformers.properties content.transformer.Poi.priority=70 content.transformer.Poi.extensions

Re: Using POI transformer to transform excel documents

darkstar1 — Fri, 22 Jan 2016 09:19:00 GMT

I decided to create the following complex pipeline (Excel => PDF => HTML) instead and then replace the out of the box transformer for PDF to html (which seems to be <a href="https://github.com/Alfresco/community-edition/blob/dcbe8a0d5219614fbe8bc11c166d638152b9367c/projects/repository/config/alfresco/subsystems/Transformers/default/transformers.properties#L311">PdfBox</a>) with pdf2htmlex for the pdf=>html transformation.
<strong>My transformer spring bean</strong>:


    <bean id="transformer.worker.pdf2htmlex" class="org.alfresco.repo.content.transform.RuntimeExecutableContentTransformerWorker">
        <property name="mimetypeService">
            <ref bean="mimetypeService" />
        </property>
        <property name="checkCommand">
            <bean class="org.alfresco.util.exec.RuntimeExec">
                <property name="commandsAndArguments">
                    <map>
                        <entry key=".*">
                            <list>
                                <value>pdf2htmlex</value>
                                <value>-v</value>
                            </list>
                        </entry>
                    </map>
                </property>
                <!–<property name="errorCodes">
                    <value>1</value>
                </property>–>
            </bean>
        </property>
        <property name="transformCommand">
            <bean class="org.alfresco.util.exec.RuntimeExec">
                <property name="commandsAndArguments">
                    <map>
                        <entry key=".*" value="pdf2htmlEX –embed CFIJO ${source} ${target}"/>
                    </map>
                </property>
                <property name="processDirectory"
                          value="/"/>
            </bean>
        </property>
        <property name="explicitTransformations">
            <list>
                <bean class="org.alfresco.repo.content.transform.ExplictTransformationDetails" >
                    <constructor-arg><value>application/pdf</value></constructor-arg>
                    <constructor-arg><value>text/html</value></constructor-arg>
                </bean>
            </list>
        </property>
    </bean>

    <bean id="transformer.pdf2htmlex" class="org.alfresco.repo.content.transform.ProxyContentTransformer" parent="baseContentTransformer">
        <property name="worker">
            <ref bean="transformer.worker.pdf2htmlex" />
        </property>
    </bean>
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<strong>The transformer properties file </strong>:


#disable ootb pdf->html and xlsx->html transformation path
content.transformer.OpenOffice.extensions.xlsx.html.supported=false
#content.transformer.complex.OpenOffice.PdfBox.avilable=false
content.transformer.complex.OpenOffice.PdfBox.extensions.*.html.supported=false

#PDF to html transformer
content.transformer.pdf2htmlex.available=true
content.transformer.pdf2htmlex.priority=50
content.transformer.pdf2htmlex.extensions.pdf.html.supported=true
content.transformer.pdf2htmlex.extensions.pdf.html.priority=50


#   XLSX to HTML pipeline
content.transformer.complex.Xlsx.Html.pipeline=*|pdf|pdf2htmlex
content.transformer.complex.Xlsx.Html.available=true
content.transformer.complex.Xlsx.Html.extensions.xlsx.html.priority=30
content.transformer.complex.Xlsx.Html.extensions.xlsx.html.supported=true
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One thing I notice, is that when I startup my repository, this shows up in the logs:


2016-01-21 14:18:37,962  TRACE [util.exec.RuntimeExec] [localhost-startStop-1] Execution result: 
   os:         Mac OS X
   command:    pdf2htmlex -v
   succeeded:  true
   exit code:  0
   out:        
   err:        pdf2htmlEX version 0.13.6
Copyright 2012-2014 Lu Wang <coolwanglu@gmail.com> and other contributors
Libraries: 
  poppler 0.40.0
  libfontforge 20160113
  cairo 1.14.6
Default data-dir: /usr/local/Cellar/pdf2htmlex/0.13.6_7/share/pdf2htmlEX
Supported
   existing environment: 
        JAVA_MAIN_CLASS_7289=com.intellij.rt.execution.application.AppMain
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I'm wondering why, if the check command has an exit code of 0, is the output to the command an error; but the main thing is that the transform command results in an error and a zero byte target file.
Copying that exact command and executing it in terminal always succeeds.

Re: Using POI transformer to transform excel documents

darkstar1 — Mon, 25 Jan 2016 10:44:00 GMT

So it turns out that the reason for the failing argument is down to the way that you specify arguments for the transformCommand


<property name="transformCommand">
            <bean class="org.alfresco.util.exec.RuntimeExec">
                <property name="commandsAndArguments">
                    <map>
                        <entry key=".*">
                            <list>
                                <value>pdf2htmlEX</value>
                                <value>–embed</value>
                                <value>CFIJO</value>
                                <value>${source}</value>
                                <value>${target}</value>
                            </list>
                        </entry>
                    </map>
                </property>
                <property name="processDirectory" value="/"/>
            </bean>
        </property>
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as opposed to:


<property name="transformCommand">
<bean class="org.alfresco.util.exec.RuntimeExec">
      <property name="commandsAndArguments">
              <map>
                  <entry key=".*" value="pdf2htmlEX –embed CFIJO ${source} ${target}"/>
              </map>
          </property>
      <property name="processDirectory" value="/"/>
</bean>
</property>
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I had found the clue in the comments written on org/alfresco/util/exec/RuntimeExec.java class that's responsible for executing the commands

Re: Using POI transformer to transform excel documents

darkstar1 — Tue, 26 Jan 2016 12:28:30 GMT

Also, like Jeff Potts <a href="https://forums.alfresco.com/comment/160957#comment-160957">in his post</a>, I came across the exact same issue and was resolved in exactly the same way. The reason, I think for this is that I believe that the complex pipeline needs to be registered with the TransformerRegistry on startup other wise it is unable to recognise and declare the transformer as available for the pipeline.

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