Class: NoSE::QueryGraph::Edge

Inherits:
Object
  • Object
show all
Defined in:
lib/nose/query_graph.rb

Overview

An edge between two Nodes in a Graph

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(from, to, key) ⇒ Edge

Returns a new instance of Edge.



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# File 'lib/nose/query_graph.rb', line 37

def initialize(from, to, key)
  @from = from
  @to = to
  @key = key
end

Instance Attribute Details

#from ⇒ Object (readonly)

Returns the value of attribute from.



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# File 'lib/nose/query_graph.rb', line 35

def from
  @from
end

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/nose/query_graph.rb', line 35

def key
  @key
end

#to ⇒ Object (readonly)

Returns the value of attribute to.



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# File 'lib/nose/query_graph.rb', line 35

def to
  @to
end

Instance Method Details

#==(other) ⇒ Object Also known as: eql?

Edges are equal if the canonical parameters used to construct them are the same



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# File 'lib/nose/query_graph.rb', line 51

def ==(other)
  return false unless other.is_a? Edge
  canonical_params == other.canonical_params
end

#canonical_params ⇒ Array

Produce the parameters to initialize the canonical version of this edge (this accounts for different directionality of edges)

Returns:



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# File 'lib/nose/query_graph.rb', line 64

def canonical_params
  if @from.entity.name > @to.entity.name
    [@from.entity.name, @to.entity.name, @key.name]
  else
    [@to.entity.name, @from.entity.name, @key.reverse.name]
  end
end

#hash ⇒ Object 



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# File 'lib/nose/query_graph.rb', line 57

def hash
  canonical_params.hash
end

#inspect ⇒ Object

:nocov:



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# File 'lib/nose/query_graph.rb', line 44

def inspect
  @key.inspect
end