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Class: Gem::Resolver::Molinillo::DependencyGraph::DetachVertexNamed

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Action
Instance Chain:
self, Action
Inherits: Gem::Resolver::Molinillo::DependencyGraph::Action
Defined in: lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb

Overview

Action

DetachVertexNamed

Class Method Summary

Action - Inherited

.action_name

Instance Attribute Summary

Action - Inherited

#next, #previous

Instance Method Summary

Action - Inherited

#down

Reverses the action on the given graph.
#up

Performs the action on the given graph.

Constructor Details

.new(name) ⇒ DetachVertexNamed

Initialize an action to detach a vertex from a dependency graph

Parameters:

  • name (String) —

    the name of the vertex to detach

[ GitHub ] 

  


# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb', line 55



def initialize(name)
  @name = name
end


  







Class Method Details



  

    .action_name  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb', line 11



def self.action_name
  :add_vertex
end


  







Instance Attribute Details



  

    #name  ⇒ String  (readonly)
  



  

    
  





  
Returns:


    
  
  • 
    (String)
—    
    

    the name of the vertex to detach
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb', line 51



attr_reader :name


  







Instance Method Details



  

    #down(graph)  ⇒ Void 
  



  

    

Reverses the action on the given graph.


  





  
Parameters:





  [ GitHub ]


  

  


# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb', line 37



def down(graph)
  return unless @vertex
  graph.vertices[@vertex.name] = @vertex
  @vertex.outgoing_edges.each do |e|
    e.destination.incoming_edges << e
  end
  @vertex.incoming_edges.each do |e|
    e.origin.outgoing_edges << e
  end
end


  








  

    #up(graph)  ⇒ Void 
  



  

    

Performs the action on the given graph.


  





  
Parameters:





  [ GitHub ]


  

  


# File 'lib/rubygems/resolver/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb', line 16



def up(graph)
  return [] unless @vertex = graph.vertices.delete(name)

  removed_vertices = [@vertex]
  @vertex.outgoing_edges.each do |e|
    v = e.destination
    v.incoming_edges.delete(e)
    if !v.root? && v.incoming_edges.empty?
      removed_vertices.concat graph.detach_vertex_named(v.name)
    end
  end

  @vertex.incoming_edges.each do |e|
    v = e.origin
    v.outgoing_edges.delete(e)
  end

  removed_vertices
end