Class: Puppet::Graph::RbTreeMap::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/graph/rb_tree_map.rb

Overview

:nodoc: all

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key, value) ⇒ Node

Returns a new instance of Node.



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# File 'lib/puppet/graph/rb_tree_map.rb', line 200

def initialize(key, value)
  @key = key
  @value = value
  @color = :red
  @left = nil
  @right = nil
end

Instance Attribute Details

#color ⇒ Object

Returns the value of attribute color.



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# File 'lib/puppet/graph/rb_tree_map.rb', line 199

def color
  @color
end

#key ⇒ Object

Returns the value of attribute key.



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# File 'lib/puppet/graph/rb_tree_map.rb', line 199

def key
  @key
end

#left ⇒ Object

Returns the value of attribute left.



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# File 'lib/puppet/graph/rb_tree_map.rb', line 199

def left
  @left
end

#right ⇒ Object

Returns the value of attribute right.



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# File 'lib/puppet/graph/rb_tree_map.rb', line 199

def right
  @right
end

#value ⇒ Object

Returns the value of attribute value.



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# File 'lib/puppet/graph/rb_tree_map.rb', line 199

def value
  @value
end

Instance Method Details

#colorflip ⇒ Object 



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# File 'lib/puppet/graph/rb_tree_map.rb', line 225

def colorflip
  @color       = @color == :red       ? :black : :red
  @left.color  = @left.color == :red  ? :black : :red
  @right.color = @right.color == :red ? :black : :red
end

#fixup ⇒ Object 



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# File 'lib/puppet/graph/rb_tree_map.rb', line 276

def fixup
  rotate_left if @right && @right.red?
  rotate_right if (@left && @left.red?) && (@left.left && @left.left.red?)
  colorflip if (@left && @left.red?) && (@right && @right.red?)

  self
end

#move_red_left ⇒ Object 



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# File 'lib/puppet/graph/rb_tree_map.rb', line 257

def move_red_left
  colorflip
  if (@right.left && @right.left.red?)
    @right.rotate_right
    rotate_left
    colorflip
  end
  self
end

#move_red_right ⇒ Object 



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# File 'lib/puppet/graph/rb_tree_map.rb', line 267

def move_red_right
  colorflip
  if (@left.left && @left.left.red?)
    rotate_right
    colorflip
  end
  self
end

#red? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/graph/rb_tree_map.rb', line 221

def red?
  @color == :red
end

#rotate_left ⇒ Object 



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# File 'lib/puppet/graph/rb_tree_map.rb', line 231

def rotate_left
  r = @right
  r_key, r_value = r.key, r.value
  b = r.left
  r.left = @left
  @left = r
  @right = r.right
  r.right = b
  r.color, r.key, r.value = :red, @key, @value
  @key, @value = r_key, r_value
  self
end

#rotate_right ⇒ Object 



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# File 'lib/puppet/graph/rb_tree_map.rb', line 244

def rotate_right
  l = @left
  l_key, l_value = l.key, l.value
  b = l.right
  l.right = @right
  @right = l
  @left = l.left
  l.left = b
  l.color, l.key, l.value = :red, @key, @value
  @key, @value = l_key, l_value
  self
end

#to_hash ⇒ Object 



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# File 'lib/puppet/graph/rb_tree_map.rb', line 208

def to_hash
  h = {
    :node => {
      :key => @key,
      :value => @value,
      :color => @color,
    }
  }
  h.merge!(:left => left.to_hash) if @left
  h.merge!(:right => right.to_hash) if @right
  h
end