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.



7
8
9
10
11
12
13
14
15
 
# 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.



5
6
7
 
# File 'lib/neography/node_traverser.rb', line 5

def depth
  @depth
end

#filter(body) ⇒ Object

Returns the value of attribute filter.



5
6
7
 
# File 'lib/neography/node_traverser.rb', line 5

def filter
  @filter
end

#order(o) ⇒ Object

Returns the value of attribute order.



5
6
7
 
# File 'lib/neography/node_traverser.rb', line 5

def order
  @order
end

#prune(body) ⇒ Object

Returns the value of attribute prune.



5
6
7
 
# File 'lib/neography/node_traverser.rb', line 5

def prune
  @prune
end

#relationships ⇒ Object

Returns the value of attribute relationships.



5
6
7
 
# File 'lib/neography/node_traverser.rb', line 5

def relationships
  @relationships
end

#uniqueness(u) ⇒ Object

Returns the value of attribute uniqueness.



5
6
7
 
# File 'lib/neography/node_traverser.rb', line 5

def uniqueness
  @uniqueness
end

Instance Method Details

#<<(other_node) ⇒ Object 



17
18
19
20
 
# File 'lib/neography/node_traverser.rb', line 17

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

#[](index) ⇒ Object 



94
95
96
 
# File 'lib/neography/node_traverser.rb', line 94

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

#both(type) ⇒ Object 



36
37
38
39
 
# File 'lib/neography/node_traverser.rb', line 36

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

#create(other_node) ⇒ Object 



22
23
24
25
26
27
28
29
30
31
32
33
34
 
# 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 



102
103
104
105
106
107
108
 
# File 'lib/neography/node_traverser.rb', line 102

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) 


98
99
100
 
# File 'lib/neography/node_traverser.rb', line 98

def empty?
  first == nil
end

#include_start_node ⇒ Object 



81
82
83
84
85
86
 
# File 'lib/neography/node_traverser.rb', line 81

def include_start_node
  @filter = Hash.new
  @filter["language"] = "builtin"
  @filter["name"] = "all"
  self
end

#incoming(type) ⇒ Object 



46
47
48
49
 
# File 'lib/neography/node_traverser.rb', line 46

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

#iterator ⇒ Object 



110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/neography/node_traverser.rb', line 110

def iterator
  options = Hash.new
  options["order"] = @order
  options["uniqueness"] = @uniqueness
  options["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 



41
42
43
44
 
# 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 



88
89
90
 
# File 'lib/neography/node_traverser.rb', line 88

def size
  [*self].size
end