Class: Graffiti::RdfConfig

Inherits:
Object
  • Object
show all
Defined in:
lib/graffiti/rdf_config.rb

Overview

Configuration of relational RDF storage (see examples)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ RdfConfig

Returns a new instance of RdfConfig.



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# File 'lib/graffiti/rdf_config.rb', line 22

def initialize(config)
  @ns = config['ns']

  @map = {}

  config['map'].each_pair do |p, m|
    table, field = m.to_a.first
    p = ns_expand(p)
    @map[p] = RdfPropertyMap.new(p, table, field)
  end

  if config['subproperties'].kind_of? Hash
    config['subproperties'].each_pair do |p, subproperties|
      p = ns_expand(p)
      map = @map[p] or raise RuntimeError,
        "Incorrect RDF storage configuration: superproperty #{p} must be mapped"
      map.superproperty = true

      qualifier = RdfPropertyMap.qualifier_property(p)
      @map[qualifier] = RdfPropertyMap.new(
        qualifier, map.table, RdfPropertyMap.qualifier_field(map.field))

      subproperties.each do |subp|
        subp = ns_expand(subp)
        @map[subp] = RdfPropertyMap.new(subp, map.table, map.field)
        @map[subp].subproperty_of = p
      end
    end
  end

  if config['transitive_closure'].kind_of? Hash
    config['transitive_closure'].each_pair do |p, table|
      @map[ ns_expand(p) ].transitive_closure = table

      if config['subproperties'].kind_of?(Hash) and config['subproperties'][p]
        config['subproperties'][p].each do |subp|
          @map[ ns_expand(subp) ].transitive_closure = table
        end
      end
    end
  end
end

Instance Attribute Details

#map ⇒ Object (readonly)

map internal property names with expanded namespaces to RdfPropertyMap objects



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# File 'lib/graffiti/rdf_config.rb', line 71

def map
  @map
end

#ns ⇒ Object (readonly)

hash of namespaces



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# File 'lib/graffiti/rdf_config.rb', line 66

def ns
  @ns
end

Instance Method Details

#ns_expand(p) ⇒ Object 



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# File 'lib/graffiti/rdf_config.rb', line 73

def ns_expand(p)
  p and p.sub(/\A(\S+?)::/) { @ns[$1] }
end