Class: NodeQuery

Inherits:
Object
  • Object
show all
Defined in:
lib/services/node_query.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(node, repository) ⇒ NodeQuery

Returns a new instance of NodeQuery.



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# File 'lib/services/node_query.rb', line 4

def initialize(node, repository)
  @node = node
  @repository = repository
end

Instance Attribute Details

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/services/node_query.rb', line 2

def node
  @node
end

#repository ⇒ Object (readonly)

Returns the value of attribute repository.



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# File 'lib/services/node_query.rb', line 2

def repository
  @repository
end

Instance Method Details

#predicates_and_objects ⇒ Object 



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# File 'lib/services/node_query.rb', line 27

def predicates_and_objects
  values = {}
  repository.query([ node, nil, nil ]).each do |s|
    if values.has_key? s.predicate
      if values[s.predicate].is_a? Array
        values[s.predicate] << s.object
      else
        values[s.predicate] = [
          values[s.predicate], s.object
        ]
      end
    else
      values[s.predicate] = s.object
    end
  end
  values
end

#set_value(predicate, object, replace = true) ⇒ Object 



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# File 'lib/services/node_query.rb', line 22

def set_value(predicate, object, replace = true)
  delete_value(predicate) if replace
  @repository << [ node, predicate, object ]
end

#value(predicate) ⇒ Object 



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# File 'lib/services/node_query.rb', line 9

def value(predicate)
  values(predicate).first
end

#value_exists?(predicate) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/services/node_query.rb', line 18

def value_exists?(predicate)
  values(predicate).any?
end

#values(predicate) ⇒ Object 



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# File 'lib/services/node_query.rb', line 13

def values(predicate)
  results = repository.query([ node, predicate, nil ])
  results.map {|s| s.object }
end