Module: RDF::RDFObjects::Resource

Included in:
Node, URI
Defined in:
lib/rdf/rdfobjects/resource.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 206

def method_missing(meth, *args)
  if RDF.const_defined?(meth) && RDF.const_get(meth).ancestors.index(RDF::Vocabulary)
    send(:"[]", meth)
  end
end

Instance Attribute Details

#graph ⇒ Object

Returns the value of attribute graph.



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# File 'lib/rdf/rdfobjects/resource.rb', line 3

def graph
  @graph
end

Instance Method Details

#[](p) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 21

def [](p)
  p = RDF::Resource.new(p) if p.is_a?(String)
  results = {}
  if p.is_a?(RDF::Resource)
    if p == RDF.to_rdf
      regex = Regexp.new(p.to_s)
      if assertions
        assertions.each_pair do |pred, objects|
          results[pred.to_s] = objects if pred.to_s =~ /^#{regex}/
        end 
      end
      results.extend(AssertionSet)
      results.vocabulary = p
      results.subject = self
    else          
      @graph.query(:subject=>self, :predicate=>p).each do |r|
        if r.object.is_a?(RDF::Resource)
          unless r.object.frozen?
            r.object.extend(RDF::RDFObjects::Resource)
            r.object.graph = self.graph
          end
        end
        results[r.predicate] ||=[]
        results[r.predicate] << r.object
      end   
    end               
  elsif p.is_a?(Class) && p.inspect =~ /^RDF::Vocabulary\(/
    regex = Regexp.new(p.to_s)
    if assertions
      assertions.each_pair do |pred, objects|
        results[pred.to_s] = objects if pred.to_s =~ /^#{regex}/
      end 
    end
    results.extend(AssertionSet)
    results.vocabulary = p
    results.subject = self
    
  elsif (RDF.const_defined?(p) && RDF.const_get(p).ancestors.index(RDF::Vocabulary))
    regex = Regexp.new(RDF.const_get(p).to_s)
    if assertions
      assertions.each_pair do |pred, objects|
        results[pred.to_s] = objects if pred.to_s =~ /^#{regex}/
      end 
    end
    results.extend(AssertionSet)
    results.vocabulary = RDF.const_get(p)         
    results.subject = self
  end
  
  if results.is_a?(AssertionSet)
    results.each_pair do |pred, objs|
      objs.extend(ObjectSet)
      objs.set_statement(RDF::Statement.new(self, pred, ""))
    end        
    obj_set = results
  else
    obj_set = case results.keys.length
    when 0
      set = []
      set.extend(ObjectSet)
      set.set_statement(RDF::Statement.new(self,p,""))
      set
    when 1
      set = []
      results.values.first.each do |v|
        set << v
      end
      set.extend(ObjectSet)
      set.set_statement(RDF::Statement.new(self,p,""))
      set
    end
  end
  obj_set
end

#[]=(p, o) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 96

def []=(p,o)      
  p = RDF::URI.intern(p) unless p.is_a?(RDF::URI)
  @graph.query(:subject=>self, :predicate=>p).each {|stmt| @graph.delete(stmt)}    
  [*o].each do |obj|
    next unless obj
    obj = cast_as_typed_object(obj)        
    if obj.is_a?(RDF::Resource) && !obj.frozen?
      obj.graph = @graph
    elsif obj.is_a?(RDF::Resource) && obj.frozen? && obj.graph != @graph
      obj = RDF::URI.new(obj)
      obj.graph = @graph
      obj.freeze
    end
    @graph << [self, p, obj] unless obj.nil?
  end
  self[p]
end

#assert(p, o) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 8

def assert(p, o)
  p = RDF::URI.intern(p) unless p.is_a?(RDF::URI)
  unless o.is_a?(RDF::Resource) || o.is_a?(RDF::Literal)
    o = RDF::Literal.new(o)
  end
  @graph << [self, p, o]
end

#cast_as_typed_object(o) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 140

def cast_as_typed_object(o)
  return o if o.is_a?(RDF::Literal) || o.is_a?(RDF::Resource)
  return Literal.new(o)
end

#clear ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 202

def clear
  @graph.query(:subject=>self).each {|stmt| @graph.delete(stmt)}
end

#object_of ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 157

def object_of
  subjects = []
  @graph.query(:object=>self).each do |stmt|
    s = stmt.subject
    s.extend(RDF::RDFObjects::Resource)
    s.graph = @graph
    subjects << s
  end
  subjects
end

#predicates ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 145

def predicates
  p = []
  @graph.query(:subject=>self).each {|stmt| p << stmt.predicate unless p.include?(stmt.predicate)}
  p
end

#properties ⇒ Object Also known as: assertions 



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# File 'lib/rdf/rdfobjects/resource.rb', line 168

def properties
  results = {}
  @graph.query(:subject=>self).each do |r| 
    if r.object.is_a?(RDF::Resource)
      r.object.graph = self.graph unless r.object.frozen?
    end
    results[r.predicate] ||=[]
    results[r.predicate] << r.object
  end
  
  obj_set = case results.keys.length
  when 0 then nil
  else
    results.each_pair do |pred, objs|
      #objs.each do |o|
        objs.extend(ObjectSet)
        objs.set_statement(RDF::Statement.new(self, pred, ""))
      #end
      #results[pred] = objs.first if objs.length == 1
      results
    end
  end
  obj_set      
end

#push(p, o) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 134

def push(p, o)
  p = RDF::URI.intern(p) unless p.is_a?(RDF::URI)
  o = cast_as_typed_object(o)
  @graph << [self, p, o]
end

#relate(p, o) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 16

def relate(p, o)
  o = RDF::Resource.new(o) unless o.is_a?(RDF::Resource)
  assert(p, o)
end

#remove(p, o = nil) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 114

def remove(p, o=nil)
  p = RDF::URI.intern(p) unless p.is_a?(RDF::URI)
  removals = []
  if o
    o = cast_as_typed_object(o)
    query = {:subject=>self, :predicate=>p, :object=>o}
  else
    query = {:subject=>self, :predicate=>p}
  end
  @graph.query(query).each do |stmt| 
    removals << stmt
    @graph.delete(stmt)
  end      
  if o
    removals.first
  else
    removals
  end
end

#statements ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 151

def statements
  stmts = []
  @graph.query(:subject=>self, :predicate=>p).each {|stmt| stmts << stmt}   
  stmts
end

#to_ntriples ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 212

def to_ntriples
  RDF::Writer.for(:ntriples).buffer do |writer|
    @graph.query(:subject=>self).each_statement do |statement|
      writer << statement
    end
  end      
end

#type ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 198

def type
  self[RDF.type]
end

#type=(rdf_type) ⇒ Object 



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# File 'lib/rdf/rdfobjects/resource.rb', line 194

def type=(rdf_type)
  self[RDF.type] = rdf_type
end