Module: Association::Index

Defined in:
lib/rbbt/association/index.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#source_field ⇒ Object

Returns the value of attribute source_field.



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# File 'lib/rbbt/association/index.rb', line 109

def source_field
  @source_field
end

#target_field ⇒ Object

Returns the value of attribute target_field.



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# File 'lib/rbbt/association/index.rb', line 109

def target_field
  @target_field
end

#undirected ⇒ Object

Returns the value of attribute undirected.



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# File 'lib/rbbt/association/index.rb', line 109

def undirected
  @undirected
end

Class Method Details

.setup(repo) ⇒ Object 



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# File 'lib/rbbt/association/index.rb', line 114

def self.setup(repo)
  repo.extend Association::Index
  repo.parse_key_field
  repo.unnamed = true
  repo
end

Instance Method Details

#match(entity) ⇒ Object 



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# File 'lib/rbbt/association/index.rb', line 169

def match(entity)
  return entity.inject([]){|acc,e| acc.concat match(e); acc } if Array === entity
  return [] if entity.nil?
  prefix(entity + "~")
end

#matches(entities) ⇒ Object 



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# File 'lib/rbbt/association/index.rb', line 175

def matches(entities)
  entities.inject(nil) do |acc,e| 
    m = match(e); 
    if acc.nil? or acc.empty?
      acc = m
    else
      acc.concat m
    end
    acc
  end
end

#parse_key_field ⇒ Object 



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# File 'lib/rbbt/association/index.rb', line 110

def parse_key_field
  @source_field, @target_field, @undirected = key_field.split("~")
end

#reverse ⇒ Object 



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# File 'lib/rbbt/association/index.rb', line 121

def reverse
  @reverse ||= begin
                 if self.respond_to? :persistence_path
                   persistence_path = self.persistence_path
                   persistence_path = persistence_path.find if Path === persistence_path
                   reverse_filename = persistence_path + '.reverse'
                 else
                   raise "Can only reverse a TokyoCabinet::BDB dataset at the time"
                 end

                 if File.exists?(reverse_filename)
                   new = Persist.open_tokyocabinet(reverse_filename, false, serializer, TokyoCabinet::BDB)
                   raise "Index has no info: #{reverse_filename}" if new.key_field.nil?
                   Association::Index.setup new
                   new
                 else
                   FileUtils.mkdir_p File.dirname(reverse_filename) unless File.exists?(File.dirname(reverse_filename))

                   new = Persist.open_tokyocabinet(reverse_filename, true, serializer, TokyoCabinet::BDB)
                   
                   self.with_unnamed do
                     self.with_monitor :desc => "Reversing #{ persistence_path }" do
                       self.through do |key, value|
                         new_key = key.split("~").reverse.join("~")
                         new[new_key] = value
                       end
                     end
                   end
                   annotate(new)
                   new.key_field = key_field.split("~").values_at(1,0,2).compact * "~"
                   new.read_and_close do
                     Association::Index.setup new
                   end
                   new.read
                 end

                 new.unnamed = true

                 new.undirected = undirected

                 new
               rescue Exception
                 Log.error "Deleting after error reversing database: #{ reverse_filename }"
                 FileUtils.rm reverse_filename if File.exists? reverse_filename
                 raise $!
               end
end

#subset(source, target) ⇒ Object

{{{ Subset



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# File 'lib/rbbt/association/index.rb', line 209

def subset(source, target)
  return [] if source.nil? or target.nil? or source.empty? or target.empty?

  if source == :all or source == "all"
    if target == :all or target == "all"
      return keys
    else
      matches = reverse.subset(target, source)
      return matches.collect{|m| r = m.partition "~"; r.reverse*"" }
    end
  end

  matches = source.uniq.inject([]){|acc,e| 
    if block_given?
      acc.concat(match(e))
    else
      acc.concat(match(e))
    end
  }

  return matches if target == :all or target == "all"

  target_matches = {}

  matches.each{|code| 
    s,sep,t = code.partition "~"
    next if undirected and t > s and source.include? t
    target_matches[t] ||= []
    target_matches[t] << code
  }

  target_matches.values_at(*target.uniq).flatten.compact
end

#to_matrix(value_field = nil, &block) ⇒ Object 



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# File 'lib/rbbt/association/index.rb', line 187

def to_matrix(value_field = nil, &block)
  value_field = fields.first if value_field.nil? and fields.length == 1
  value_pos = identify_field value_field if value_field and String === value_field
  key_field = source_field

  tsv = if value_pos
          AssociationItem.incidence self.keys, key_field do |key|
            if block_given? 
              yield self[key][value_pos]
            else
              self[key][value_pos]
            end
          end
        elsif block_given?
          AssociationItem.incidence self.keys, key_field, &block
        else
          AssociationItem.incidence self.keys, key_field 
        end
end