Class: Ruleby::Core::ParentNode

Inherits:
Node show all
Defined in:
lib/core/nodes.rb

Overview

This is the base class for all nodes in the network that output to some other node (i.e. they are not at the bottom). It contains methods for propagating match results.

Instance Attribute Summary collapse

Attributes inherited from Printable

#parent_nodes

Instance Method Summary collapse

Methods inherited from Node

#resolve

Methods inherited from Printable

#print

Constructor Details

#initialize ⇒ ParentNode

Returns a new instance of ParentNode.



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# File 'lib/core/nodes.rb', line 286

def initialize()
  super
  @out_nodes = []   
end

Instance Attribute Details

#child_nodes ⇒ Object (readonly)

Returns the value of attribute child_nodes.



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# File 'lib/core/nodes.rb', line 285

def child_nodes
  @child_nodes
end

Instance Method Details

#add_out_node(node, atom = nil) ⇒ Object 



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# File 'lib/core/nodes.rb', line 291

def add_out_node(node,atom=nil)
  unless @out_nodes.index node
    @out_nodes.push node
  end
end

#assert(assertable) ⇒ Object 



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# File 'lib/core/nodes.rb', line 314

def assert(assertable)
  propagate_assert(assertable)
end

#forks?(atom) ⇒ Boolean

returns true if this node is already being used for the same atom. That is, if it is used again it will fork the network (or the network may already be forked).

Returns:

  • (Boolean) 


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# File 'lib/core/nodes.rb', line 300

def forks?(atom)
  return !@out_nodes.empty?
end

#propagate_assert(assertable, out_nodes = @out_nodes) ⇒ Object 



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# File 'lib/core/nodes.rb', line 318

def propagate_assert(assertable,out_nodes=@out_nodes)
  out_nodes.each do |out_node|
    out_node.assert(assertable)
  end
end

#propagate_retract(fact, out_nodes = @out_nodes) ⇒ Object 



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# File 'lib/core/nodes.rb', line 308

def propagate_retract(fact,out_nodes=@out_nodes)
  out_nodes.each do |out_node|
    out_node.retract(fact)
  end
end

#retract(fact) ⇒ Object 



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# File 'lib/core/nodes.rb', line 304

def retract(fact)
  propagate_retract(fact)
end