Class: Shoes::Search

Inherits:
Object
  • Object
show all
Includes:
FTSearch
Defined in:
lib/shoes/search.rb

Overview

require ‘ftsearchrt’

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(fields = [:uri, :body]) ⇒ Search

Returns a new instance of Search.



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# File 'lib/shoes/search.rb', line 8

def initialize fields = [:uri, :body]
  field_infos = FTSearch::FieldInfos.new
  fields.each do |name|
    field_infos.add_field :name => name,
      :analyzer => FTSearch::Analysis::SimpleIdentifierAnalyzer.new
  end
  @index = FTSearch::FragmentWriter.new :path => nil, :field_infos => field_infos
end

Instance Attribute Details

#index ⇒ Object (readonly)

Returns the value of attribute index.



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# File 'lib/shoes/search.rb', line 7

def index
  @index
end

Instance Method Details

#add_document(hsh) ⇒ Object 



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# File 'lib/shoes/search.rb', line 16

def add_document hsh
  @index.add_document hsh
end

#find_all(terms, show = 20, prob_sort = false) ⇒ Object 



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# File 'lib/shoes/search.rb', line 26

def find_all terms, show = 20, prob_sort = false
  h = Hash.new{|h,k| h[k] = 0}
  weights = Hash.new(1.0)
  weights[0] = 10000000   # :uri
  weights[1] = 10000000  # :body
  hits = @sa.find_all terms
  size = hits.size
  if prob_sort && size > 10000
    iterations = 50 * Math.sqrt(size)
    offsets = @sa.lazyhits_to_offsets(hits)
    weight_arr = weights.sort_by{|id,w| id}.map{|_,v| v}
    sorted = @dm.rank_offsets_probabilistic(offsets, weight_arr, iterations)
  else
    offsets = @sa.lazyhits_to_offsets(hits)
    sorted = @dm.rank_offsets(offsets, weights.sort_by{|id,w| id}.map{|_,v| v})
  end
  sorted[0..show].map do |doc_id, count|
    [@dm.document_id_to_uri(doc_id), count]
  end
end

#finish! ⇒ Object 



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# File 'lib/shoes/search.rb', line 19

def finish!
  @index.finish!

  @ft = FulltextReader.new :io => StringIO.new(@index.fulltext_writer.data)
  @sa = SuffixArrayReader.new @ft, nil, :io => StringIO.new(@index.suffix_array_writer.data)
  @dm = DocumentMapReader.new :io => StringIO.new(@index.doc_map_writer.data)
end