Class: Neography::NodeTraverser

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/neography/node_traverser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(from, types = nil, dir = "all") ⇒ NodeTraverser

Returns a new instance of NodeTraverser.



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# File 'lib/neography/node_traverser.rb', line 7

def initialize(from, types = nil, dir = "all" )
  @from  = from
  @order = "depth first"
  @uniqueness = "none"
  @relationships = Array.new
  types.each do |type|
    @relationships << {"type" => type.to_s, "direction" => dir.to_s }
  end unless types.nil?
end

Instance Attribute Details

#depth(d) ⇒ Object

Returns the value of attribute depth.



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# File 'lib/neography/node_traverser.rb', line 5

def depth
  @depth
end

#filter(body) ⇒ Object

Returns the value of attribute filter.



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# File 'lib/neography/node_traverser.rb', line 5

def filter
  @filter
end

#order(o) ⇒ Object

Returns the value of attribute order.



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# File 'lib/neography/node_traverser.rb', line 5

def order
  @order
end

#prune(body) ⇒ Object

Returns the value of attribute prune.



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# File 'lib/neography/node_traverser.rb', line 5

def prune
  @prune
end

#relationships ⇒ Object

Returns the value of attribute relationships.



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# File 'lib/neography/node_traverser.rb', line 5

def relationships
  @relationships
end

#uniqueness(u) ⇒ Object

Returns the value of attribute uniqueness.



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# File 'lib/neography/node_traverser.rb', line 5

def uniqueness
  @uniqueness
end

Instance Method Details

#<<(other_node) ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 17

def <<(other_node)
  create(other_node)
  self
end

#[](index) ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 97

def [](index)
  each_with_index {|node,i| break node if index == i}
end

#both(type) ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 36

def both(type)
  @relationships << {"type" => type.to_s, "direction" => "all"}
  self
end

#create(other_node) ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 22

def create(other_node)
  case @relationships.first["direction"]
    when "outgoing", "out"
      rel = Neography::Relationship.new(@from.neo_server.create_relationship(@relationships.first["type"], @from, other_node))
    when "incoming", "in"
      rel = Neography::Relationship.new(@from.neo_server.create_relationship(@relationships.first["type"], other_node, @from))
    else
      rel = Array.new
      rel << Neography::Relationship.new(@from.neo_server.create_relationship(@relationships.first["type"], @from, other_node))
      rel << Neography::Relationship.new(@from.neo_server.create_relationship(@relationships.first["type"], other_node, @from))
  end
  rel       
end

#each ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 105

def each
  iterator.each do |i| 
    node = @from.class.new(i)
    node.neo_server = @from.neo_server
    yield node
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/neography/node_traverser.rb', line 101

def empty?
  first == nil
end

#include_start_node ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 83

def include_start_node
  @filter = {
    "language" => "builtin",
    "name"     => "all"
  }
  self
end

#incoming(type) ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 46

def incoming(type)
  @relationships << {"type" => type.to_s, "direction" => "in"}
  self
end

#iterator ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 113

def iterator
  options = {
    "order"         => @order,
    "uniqueness"    => @uniqueness,
    "relationships" => @relationships
  }
  options["prune evaluator"] = @prune  unless @prune.nil?
  options["return filter"]   = @filter unless @filter.nil?
  options["depth"]           = @depth  unless @depth.nil?

  if @relationships[0]["type"].empty?
    rels = @from.neo_server.get_node_relationships(@from, @relationships[0]["direction"]) || []
    case @relationships[0]["direction"]
      when "in"
        rels.collect { |r| @from.neo_server.get_node(r["start"]) } #.uniq
      when "out"
        rels.collect { |r| @from.neo_server.get_node(r["end"]) } #.uniq
      else
        rels.collect { |r|
        if @from.neo_id == r["start"].split('/').last
          @from.neo_server.get_node(r["end"])
        else
          @from.neo_server.get_node(r["start"])
        end
        } #.uniq
    end
  else
    @from.neo_server.traverse(@from, "nodes", options)
  end
end

#outgoing(type) ⇒ Object 



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# File 'lib/neography/node_traverser.rb', line 41

def outgoing(type)
  @relationships << {"type" => type.to_s, "direction" => "out"}
  self
end

#size ⇒ Object Also known as: length 



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# File 'lib/neography/node_traverser.rb', line 91

def size
  [*self].size
end