Class: Neo4j::Core::Rels::Traverser

Inherits:

Object

• Object
• Neo4j::Core::Rels::Traverser

show all

Includes:

Enumerable

Defined in:

lib/neo4j-core/rels/traverser.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) dir readonly

  Returns the value of attribute dir.

• - (Object) node readonly

  Returns the value of attribute node.

• - (Object) types readonly

  Returns the value of attribute types.

Instance Method Summary (collapse)

• - (Object) between(between) (also: #to_other)

  Specifies that we only want relationship to the given node.

• - (Object) both

  Specifies that we want both incoming and outgoing direction.

• - (Object) del

  Deletes all the relationships.

• - (Object) each

  Implements the Ruby Enumerable mixin.

• - (true, false) empty?

  If there are no relationships of specified dir and type(s).

• - (Object) incoming

  Specifies that we only want incoming relationships.

• - (Traverser) initialize(node, types, dir = :both) constructor

  Called from Neo4j::Core::Node#rels.

• - (Object) iterator

  The Java Iterator.

• - (true, false) match_between?(rel)

  True if it match the specified other node.

• - (Object) outgoing

  Specifies that only outgoing relationships is wanted.

• - (Object) to_s

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# File 'lib/neo4j-core/rels/traverser.rb', line 17

def initialize(node, types, dir = :both)
  @node = node
  @types = types
  @dir = dir
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 13

def dir
  @dir
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 12

def node
  @node
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 14

def types
  @types
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 61

def between(between)
  @between = between._java_node
  self
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 76

def both
  @dir = :both
  self
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 69

def del
  each { |rel| rel.del }
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 28

def each
  iterator.each do |rel|
    yield rel.wrapper if match_between?(rel)
  end
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 35

def empty?
  first == nil
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 83

def incoming
  @dir = :incoming
  self
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 40

def iterator
  @node._rels(@dir, *@types)
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 46

def match_between?(rel)
  if @between.nil?
    true
  elsif @dir == :outgoing
    rel._end_node == @between
  elsif @dir == :incoming
    rel._start_node == @between
  else
    rel._start_node == @between || rel._end_node == @between
  end
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 90

def outgoing
  @dir = :outgoing
  self
end

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# File 'lib/neo4j-core/rels/traverser.rb', line 23

def to_s
  "#{self.class} [types: #{@types.join(',')} dir:#{@dir}]"
end