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https://issues.apache.org/jira/browse/STANBOL-593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rupert Westenthaler resolved STANBOL-593.
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Resolution: Fixed
implemented with revision #1330107
> EntityIterator implementation based on Jena TDB that allows to filter
> Entities based on Triple Filters
> ------------------------------------------------------------------------------------------------------
>
> Key: STANBOL-593
> URL: https://issues.apache.org/jira/browse/STANBOL-593
> Project: Stanbol
> Issue Type: New Feature
> Components: Entity Hub
> Reporter: Rupert Westenthaler
> Assignee: Rupert Westenthaler
> Fix For: 0.10.0-incubating
>
>
> The FieldValueProcessor (EntityProcessor) already allows to filter Entities
> based on Triple Filters. However this requires to Iterate over all entities -
> something very ineffective if one wants only to index a rather small fraction
> of all Entities.
> To achieve better performance in such cases one needs an Component that uses
> a similar functionality to filter Entities within the Indexing Source. Such
> an implementation is very easy to implement based on Jena TDB as the low
> level API natively supports filtered iterators.
> Indexing configurations would than use a EntityIterator/EntityDataProvider
> combination as source for the indexing. A according configuration would look
> like
>
> entityIdIterator=org.apache.stanbol.entityhub.indexing.source.jenatdb.ResourceFilterIterator,config:entityTypes.properties
>
> entityDataProvider=org.apache.stanbol.entityhub.indexing.source.jenatdb.RdfIndexingSource,source:rdfdata
> the entityTypes.properties file would require the following properties
> field=rdf:type
> values=dbp-ont:Person;dbp-ont:Place;dbp-ont:Organisation
> With this configuration the indexing process would only iterate over Persons,
> Places and Organisations present within the IndexingSource.
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