Module: RDF::Repository::Implementation

Defined in:
lib/rdf/repository.rb

Overview

See Also:

Constant Summary collapse

DEFAULT_CONTEXT = 
false

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extend_object(obj) ⇒ Object 



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# File 'lib/rdf/repository.rb', line 217

def self.extend_object(obj)
  obj.instance_variable_set(:@data, obj.options.delete(:data) || {})
  super
end

Instance Method Details

#count ⇒ Object

See Also:



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# File 'lib/rdf/repository.rb', line 250

def count
  count = 0
  @data.each do |c, ss|
    ss.each do |s, ps|
      ps.each do |p, os|
        count += os.size
      end
    end
  end
  count
end

#durable? ⇒ Boolean

Returns:

  • (Boolean)

See Also:



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# File 'lib/rdf/repository.rb', line 236

def durable?
  false
end

#each_context(&block) ⇒ Object

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# File 'lib/rdf/repository.rb', line 307

def each_context(&block)
  if block_given?
    contexts = @data.keys
    contexts.delete(DEFAULT_CONTEXT)
    contexts.each(&block)
  end
  enum_context
end

#each_statement(&block) ⇒ Object Also known as: each

See Also:



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# File 'lib/rdf/repository.rb', line 277

def each_statement(&block)
  if block_given?
    # Note that to iterate in a more consistent fashion despite
    # possible concurrent mutations to `@data`, we use `#dup` to make
    # shallow copies of the nested hashes before beginning the
    # iteration over their keys and values.
    @data.dup.each do |c, ss|
      ss.dup.each do |s, ps|
        ps.dup.each do |p, os|
          os.dup.each do |o|
            block.call(RDF::Statement.new(s, p, o, :context => c.equal?(DEFAULT_CONTEXT) ? nil : c))
          end
        end
      end
    end
  end
  enum_statement
end

#empty? ⇒ Boolean

Returns:

  • (Boolean)

See Also:



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# File 'lib/rdf/repository.rb', line 243

def empty?
  @data.empty?
end

#has_context?(value) ⇒ Boolean

Returns:

  • (Boolean)

See Also:



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# File 'lib/rdf/repository.rb', line 300

def has_context?(value)
  @data.keys.include?(value)
end

#has_statement?(statement) ⇒ Boolean

Returns:

  • (Boolean)

See Also:



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# File 'lib/rdf/repository.rb', line 265

def has_statement?(statement)
  s, p, o, c = statement.to_quad
  c ||= DEFAULT_CONTEXT
  @data.has_key?(c) &&
    @data[c].has_key?(s) &&
    @data[c][s].has_key?(p) &&
    @data[c][s][p].include?(o)
end

#supports?(feature) ⇒ Boolean

Returns:

  • (Boolean)

See Also:

  • RDF::Readable#supports?


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# File 'lib/rdf/repository.rb', line 225

def supports?(feature)
  case feature.to_sym
    when :context   then true   # statement contexts / named graphs
    when :inference then false  # forward-chaining inference
    else false
  end
end