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  """ Adapts the search interface to the lucene library. """
  
  
  import pysolr
  import urllib
  
  import lucene
   
  from datafinder.persistence.adapters.lucene import constants    
  from datafinder.persistence.adapters.lucene.search import search_restriction_mapping
  from datafinder.persistence.error import PersistenceError
  from datafinder.persistence.search.searcher import NullSearcher
  
  
  
  
  __version__ = "$Revision-Id:$" 
  
  
  
  class SearchLuceneAdapter(NullSearcher):
      """ Lucene-specific implementation of the search. """
      
      def __init__(self, configuration):
          """ 
          @param configuration: Lucene-specific configuration parameters.
          @type configuration: L{Configuration<datafinder.persistence.lucene.configuration.Configuration>}
          """
   
          NullSearcher.__init__(self)
          self._configuration = configuration
  
      def search(self, restrictions, destination):
          """ 
          @see: L{NullPrincipalSearcher<datafinder.persistence.search.searcher.NullSearcher>} 
          
          E1101: Pylint cannot detect the internals of the modules solr and lucene. 
          """
          # pylint: disable=E1101
          
          results = list()
          queryString = search_restriction_mapping.mapSearchRestriction(restrictions)
          if self._configuration.luceneIndexUri.startswith("file:///"):
              try:
                  self._configuration.env.attachCurrentThread()
                  indexDir = lucene.SimpleFSDirectory(lucene.File(
                      self._configuration.luceneIndexUri.replace("file:///", "")))
                  analyzer = lucene.StandardAnalyzer(lucene.Version.LUCENE_CURRENT)
                  searcher = lucene.IndexSearcher(indexDir)
                  query = lucene.QueryParser(lucene.Version.LUCENE_CURRENT, "content", analyzer).parse(queryString)
                  hits = searcher.search(query, constants.MAX_RESULTS)
                  for hit in hits.scoreDocs:
                      doc = searcher.doc(hit.doc)
                      results.append("/%s" % urllib.unquote(doc.get(constants.FILEPATH_FIELD).encode("utf-8")))
                  searcher.close()
              except Exception, error:
                  errorMessage = "Cannot search items. Reason: '%s'" % error 
                  raise PersistenceError(errorMessage)
          elif self._configuration.luceneIndexUri.startswith("http://") or self._configuration.luceneIndexUri.startswith("https://"):
              solr = pysolr.Solr(self._configuration.luceneIndexUri)
              results = solr.query(queryString)
              for hit in results:
                  results.append("/%s" % urllib.unquote(hit[constants.FILEPATH_FIELD]))
          else:
              errorMessage = "Cannot search items. Reason: Invalid luceneIndexUri" 
              raise PersistenceError(errorMessage)
          return results
  