If you look at the https://github.com/Alfresco/alfresco-repository/blob/alfresco-repository-6.8/src/main/resources/alfr...
there is extractors configured based on specific mimetypes. Their mapping is within properties file here https://github.com/Alfresco/alfresco-repository/tree/alfresco-repository-6.8/src/main/resources/alfr...
TikaAutoMetadataExtracter takes care of other mimetypes which doesn't have specific extractors, It uses AutoDetectParser for parsing and extraction. E.g. for images
Identify all the file types you want to extend, and add appropriate bean config (copy from content-service-context.xml for reference) to inject your custom properties. Copy the ootb properties files and keep it under "alfresco/metadata/" classpath in your project. e.g. : alfresco/metadata/TikaAutoMetadataExtractor.properties.
OR use the mapping like this:
<property name="mappingProperties">
<props>
<prop key="namespace.prefix.cm">http://www.alfresco.org/model/content/1.0</prop>
<prop key="namespace.prefix.demo">http://www.github.com/model/demo/1.0</prop>
<prop key="author">cm:author</prop>
<prop key="title">cm:title</prop>
<prop key="subject">cm:description</prop>
<prop key="created">demo:originCreatedDate</prop>
<prop key="modified">demo:originModifiedDate</prop>
</props>
</property>
In TikaAutoMetadataExtractor.properties file there are so many mappings, so for this you should choose to use properties file directly instead of mapping the properties within bean definition.
An example for Images, PDF, Office :
<bean id="extracter.TikaAuto" class="org.alfresco.repo.content.metadata.TikaAutoMetadataExtracter"
parent="baseMetadataExtracter">
<constructor-arg>
<ref bean="tikaConfig" />
</constructor-arg>
<property name="overwritePolicy">
<value>EAGER</value>
</property>
<property name="mappingProperties">
<bean
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="location">
<value>classpath:alfresco/metadata/TikaAutoMetadataExtracter.properties</value>
</property>
</bean>
</property>
</bean>
<bean id="extracter.PDFBox"
class="org.alfresco.repo.content.metadata.PdfBoxMetadataExtracter"
parent="baseMetadataExtracter">
<property name="documentSelector" ref="pdfBoxEmbededDocumentSelector" />
<property name="overwritePolicy">
<value>EAGER</value>
</property>
<property name="mappingProperties">
<bean
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="location">
<value>classpath:alfresco/metadata/PdfBoxMetadataExtracter.properties</value>
</property>
</bean>
</property>
</bean>
<bean id="extracter.Poi"
class="org.alfresco.repo.content.metadata.PoiMetadataExtracter"
parent="baseMetadataExtracter">
<property name="poiFootnotesLimit" value="${content.transformer.Poi.poiFootnotesLimit}" />
<property name="poiExtractPropertiesOnly" value="${content.transformer.Poi.poiExtractPropertiesOnly}" />
<property name="poiAllowableXslfRelationshipTypes">
<list>
<!-- These values are valid for Office 2007, 2010 and 2013 -->
<value>http://schemas.openxmlformats.org/officeDocument/2006/relationships/presProps</value>
<value>http://schemas.openxmlformats.org/officeDocument/2006/relationships/viewProps</value>
</list>
</property>
<property name="overwritePolicy">
<value>EAGER</value>
</property>
<property name="mappingProperties">
<bean
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="location">
<value>classpath:alfresco/metadata/PoiMetadataExtracter.properties</value>
</property>
</bean>
</property>
</bean>
If you choose to use properties file then add custom namespace and properties mapping in the properties filed mapped to selected extractors.
For example:
in alfresco/metadata/TikaAutoMetadataExtractor.properties add:
namespace.prefix.demo=http://www.github.com/abhinavmishra14/model/demo/1.0
# Custom Properties to be mapped
created=demo:originCreatedDate
modified=demo:originModifiedDate
Same way in other selected extractor properties you can add above mappings.
For reference: https://docs.alfresco.com/6.0/references/dev-extension-points-custom-metadata-extractor.html
~Abhinav
(ACSCE, AWS SAA, Azure Admin)
