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Contents [hide] 1 Overview of gSearch for NDR 1.1 References 1.2 Constructing the Search Document 1.2.1 Code Location: CVS/repository/NDRgenericSearch 1.2.2 Directories/Files of Interest 1.2.3 Focuses on metadata 1.3 UI 1.4 Integrate with NDR API 1.5 gSearch API

Overview of gSearch for NDR

References

• Overview

• subsecond delay between changes to fedora and updates to the index
• primarily used for full stream datastream indexer

Constructing the Search Document

Code Location: CVS/repository/NDRgenericSearch

• code from fedora
• stripped down
  • comes with four configurations
  • can administer simultaneously (not needed)
• designed to be active web project (plugin)
  • look at .settings (sets up active web project)
  • no ant file

Directories/Files of Interest

• README (at root of project) - written by Tim
  • lots of comments about what was changed
• /src
  • location of java source code from fedora
• /WebContent
  • web
• /nsdlMods/java/dk/defxws/fgslucene/IndexDocumentHandler
  • changed IndexDocumentHandler class to accept structured xml
  • gsearch was taking this and trying to parse it and would die
  • now passes on the structured xml as a field value, thus putting the xml itself in the index
• /WebContent/WEB-INF/classes/config/index/NDRFoxmlToLucene.xslt
  • takes Fedora object and turns it into an index object that goes into lucene
  • each fedora object document becomes an index object document
  • look for <IndexField> which defines fields
  • look for <xsl:variable> which defines getting info from other objects to include in this object
• /WebContent/WEB-INF/classes/config/index/basicIndex/GFindObjectsToResultPage.xslt
  • added a namespace to the output stream

Focuses on metadata

• does all relsext for all object types
• processes metadata datastreams for metadata object types
• commented out getting
• does not index ncs:collectRecord

UI

URL: http://ndr.nsdlib.org:8580/ndrsearch/rest?operation=browseIndex

• problem with namespace change (See README)
• Field name: droplist will show all fields that have been indexed

Integrate with NDR API

• take gsearch output, stuffs it into jaxb objects, and then jaxb uses a different schema for producing the output
• http call to get the gsearch document
• gfind api call (gsearch api)
• getting stored copy from lucene (as opposed to getting anything directly from NDR)
• constructed object in gsearch to construct a collection object that can be returned as a whole

gSearch API

• couldn't find any documentation at fedora-commons.org
• look at rest call from UI
• gfind is the api call
• pass in lucene query to gfind

Example:

  Find all metadata objects returning 10 at a time...
  
  http://ndr.nsdlib.org:8580/ndrsearch/rest?operation=gfindObjects
    &restXslt=copyXml&query=re.nsdl.objectType:%22Metadata%22
    &hitPageSize=10&snippetsMax=0&fieldMaxLength=0