Virtual indexing fields
-----------------------

                 Key: NXP-1542
                 URL: http://jira.nuxeo.org/browse/NXP-1542
             Project: Nuxeo Enterprise Platform 5
          Issue Type: Task
            Reporter: Georges Racinet
            Assignee: Georges Racinet
             Fix For: 5.2 M1


In various situations, one needs to find or sort documents on something that 
mereley depends on the document properties, without being a true property. One 
solution is of course to declare a new field, a core listener to fill it at 
creation/modification time and tie an indexing field to it. 

A much better solution would be to declare virtual fields, in a pluggable 
fashion. Something like this:

<virtualField  
resolver="org.nuxeo.ecm.search.fields.extractor.vocabularyResolver" type="text" 
>
  <parameter name="directory">the_directory</parameter>
  (..)
</virtualField>

Ideally, the resolver would be instantiated once and keep the parameters as a 
member field. Its main method would input an indexable resource instance and 
the field configuration. 



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