Class: IqRdf::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/iq_rdf/node.rb

Direct Known Subclasses

BlankNode, Uri

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lang = nil) ⇒ Node

Returns a new instance of Node.



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# File 'lib/iq_rdf/node.rb', line 20

def initialize(lang = nil)
  @nodes = []
  @lang = lang
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/iq_rdf/node.rb', line 34

def method_missing(method_name, *args, &block)
  if (namespace_class = Namespace.find_namespace_class(method_name))
    return IqRdf::PredicateNamespace.new(self, namespace_class) # some_node.>namespace<...
  else
    return IqRdf::PredicateNamespace.new(self, IqRdf::Default).build_predicate(method_name, *args, &block) # some_node.>predicate<()
  end
end

Instance Attribute Details

#lang ⇒ Object (readonly)

Returns the value of attribute lang.



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# File 'lib/iq_rdf/node.rb', line 18

def lang
  @lang
end

#nodes ⇒ Object (readonly)

Returns the value of attribute nodes.



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# File 'lib/iq_rdf/node.rb', line 17

def nodes
  @nodes
end

Instance Method Details

#<<(node) ⇒ Object

You can add Nodes (Uris, Blank Nodes, Predicates), Literals and Collections So a Node has the following structure:

<node> <uri> or <node> <literal> (tuple)
<node> <predicate> == <node> (<predicate_node> <predicate.nodes>) (triples)

Raises:

  • (ArgumentError) 


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# File 'lib/iq_rdf/node.rb', line 29

def <<(node)
  raise ArgumentError, "#{node.inspect} is no IqRdf::Node or a IqRdf::Literal or a IqRdf::Collection" unless node.is_a?(IqRdf::Node) || node.is_a?(IqRdf::Literal) || node.is_a?(IqRdf::Collection)
  @nodes << node
end

#build_full_uri_predicate(uri, *args, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/iq_rdf/node.rb', line 46

def build_full_uri_predicate(uri, *args, &block)
  raise ArgumentError, "uri musst be an ::URI" unless uri.is_a?(::URI)

  IqRdf::PredicateNamespace.new(self, Namespace.dummy_empty_namespace).build_predicate(uri, *args, &block)
end

#is_subject? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/iq_rdf/node.rb', line 42

def is_subject?()
  false
end

#xml_lang ⇒ Object 



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# File 'lib/iq_rdf/node.rb', line 52

def xml_lang
  @lang && (@lang == :none ? "" : @lang)
end