Class: Ruleby::Core::BridgeNode

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

Overview

The BridgeNode is used to bridge the alpha network to either the beta network, or to the terminal nodes. It creates a partial match from the pattern and atoms above it in the network. Thus, there is one bridge node for each pattern (assuming they aren’t shared).

Instance Attribute Summary

Attributes inherited from ParentNode

#child_nodes

Attributes inherited from Printable

#parent_nodes

Instance Method Summary collapse

Methods inherited from ParentNode

#add_out_node, #assert, #forks?, #propagate_retract, #retract

Methods inherited from Node

#resolve

Methods inherited from Printable

#print

Constructor Details

#initialize(pattern) ⇒ BridgeNode

Returns a new instance of BridgeNode.



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# File 'lib/core/nodes.rb', line 487

def initialize(pattern)
  super()
  @pattern =  pattern
end

Instance Method Details

#propagate_assert(fact) ⇒ Object 



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# File 'lib/core/nodes.rb', line 492

def propagate_assert(fact)          
  # create the partial match
  mr = MatchResult.new
  mr.is_match = true      
  mr.recency.push fact.recency
  @pattern.atoms.each do |atom|
    mr.fact_hash[atom.tag] = fact.id
    if atom == @pattern.head
      # HACK its a pain to have to check for this, can we make it special
      mr[atom.tag] = fact.object
    else
      mr[atom.tag] = fact.object.send(atom.method) 
    end
  end
  super(MatchContext.new(fact,mr))
end