= Lucene-Only search mode =

|| '''Date''' || 2011-10-31 ||
|| '''Contact(s)''' || François Prunayre ||
|| '''Last edited''' || 2011-10-31T18:25:00 ||
|| '''Status''' || Being discussed, in progress, initial implementation in progress ||
|| '''Assigned to release''' || 2.7.x ||
|| '''Resources''' || Available ||
|| '''Ticket #''' || #XYZ ||

== Overview ==

Current search rely on the following steps:
 * Lucene Search
 * Retrieve Metadata from Database (according to search criteria and paging)
 * XSL presentation.

The aim of this proposal is to add a new search mode relying only on Lucene. This mode requires to structure and/or add all information required for results presentation in the index.


=== Proposal Type ===
 * '''Type''': Lucene, Core Change
 * '''App''': !GeoNetwork
 * '''Module''': LuceneSearcher

=== Links ===
 * '''Documents''':
  * http://trac.osgeo.org/geonetwork/ticket/485
 
=== Voting History ===
 * Vote not yet proposed.

== Motivations ==

 * Performance improvements.


== Proposal == 

The main requirement is to store all information available in the "brief" format in the index in order to retrieve those information at search time. Brief format is the pivot format used by GeoNetwork to display search results via xml.search or main.search.embeded services. Brief format fields are the following:
 * id
 * uuid
 * title
 * abstract
 * keyword
 * parentId
 * datasetcreationdate
 * geoBox
  * westBL
  * eastBL
  * southBL
  * northBL
 * Constraints (not supported/used in widget GUI, complex XML or as CData ?)
 * !SecurityConstraints (not supported/used in widget GUI, complex XML or as CData ?)
 * !LegalConstraints (not supported/used in widget GUI, complex XML or as CData ?)
 * temporalExtent (not supported/used in widget GUI)
  * begin
  * end
 * image type="unknown|thumbnail|overview"
 * responsibleParty role="{$role}" appliesTo="resource" logo=""
 * link title="" href="" name="" protocol="" type=""
 * category
 * + geonet:info/*


The q service (#485) requires to retrieve those information from the index directly instead of dumping all index fields. Some of them are already available:
 * id=_id
 * schema=_schema
 * createDate=_createDate
 * changeDate=_changeDate
 * isTemplate=_isTemplate
 * isHarvested=_isHarvested
 * popularity=_popularity
 * rating=_rating
 * displayOrder=_displayOrder
 * view=_view
 * notify=_notify
 * download=_download
 * dynamic=_dynamic
 * featured=_featured
 * owner=_owner
 * isPublishedToAll=_isPublishedToAll
 * ownername=_ownername
 * category=_category
 * valid=_valid
 * baseUrl=?
 * locService=?
 * selected=selected
 * source=_source
 * edit=_edit
 * uuid=_uuid
 * title=title
 * abstract=abstract
 * keyword=keyword
 * parentId=parentUuid
 * datasetcreationdate=createDate
 * changeDate=changeDate

Re-worked field:
 * image=image (| separated)
 * link=link (| separated)
 * geoBox (| separated)
 * responsibleParty (| separated)
 * Constraints=accessConstr (Codelist value only)
 * Constraints=otherConstr
 * !SecurityConstraints=classif (Codelist value only)
 * Constraints=conditionApplyingToAccessAndUse

New field added:
 * datasetLang=datasetLang
 * language=language
 * spatialRepresentationType=spatialRepresentationType
 * serviceType=serviceType

=== Backwards Compatibility Issues ===

None.

=== New libraries added ===

None.

== Risks ==


== Participants ==
 
 * François Prunayre
 * Others?