Class: MOSAIK::Metrics::Coupling

Inherits:
MOSAIK::Metric show all
Defined in:
lib/mosaik/metrics/coupling.rb

Overview

Coupling (S. Chidamber and C. Kemerer, 1994)

Instance Attribute Summary

Attributes inherited from MOSAIK::Metric

#graph, #options

Instance Method Summary collapse

Methods inherited from MOSAIK::Metric

#initialize

Constructor Details

This class inherits a constructor from MOSAIK::Metric

Instance Method Details

#evaluate ⇒ Object 



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# File 'lib/mosaik/metrics/coupling.rb', line 9

def evaluate
  # Total coupling
  coupling = 0.0

  # Iterate over each cluster
  graph.clusters.each_value do |cluster|
    # Find all vertices in the cluster
    vertices_in_cluster = cluster.vertices
    vertices_in_cluster_id = vertices_in_cluster.map(&:id)

    # Calculate coupling value for the cluster
    coupling_c = 0.0

    # Iterate over all vertices in the cluster
    vertices_in_cluster.each do |v|
      v.edges.each do |i, es|
        next if i.in? vertices_in_cluster_id

        coupling_c += es.sum { |e| e.attributes.fetch(:weight, 0.0) }
      end
    end

    # Store coupling value in the cluster
    cluster.attributes[:coupling] = coupling_c

    # Calculate coupling contribution from this cluster
    coupling += coupling_c
  end

  # Store coupling value in the graph
  graph.attributes[:coupling] = coupling

  # Return the total coupling
  coupling
end