Class: Gemstat::Population

Inherits:
Object
  • Object
show all
Defined in:
lib/gemstat/population.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(folder_path) ⇒ Population

Returns a new instance of Population.



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# File 'lib/gemstat/population.rb', line 4

def initialize(folder_path)
  cache_path = File.dirname(__FILE__) + '/cache/' + `du -s #{File.dirname(__FILE__)}/cache/gemfiles | cut -f1`.chomp + '.cache'
  if File.exist?(cache_path) then
    @dependencies = Marshal.load(File.read(cache_path))
  else
    @dependencies = []
    `find #{folder_path} -type d`.each_line do |line|
      dependency = Dependency.new(line.chomp)
      @dependencies.push dependency if dependency.exist?
    end
    File.open(cache_path, 'w') {|f| f.write(Marshal.dump(@dependencies)) }
  end
end

Instance Attribute Details

#dependencies ⇒ Object (readonly)

Returns the value of attribute dependencies.



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# File 'lib/gemstat/population.rb', line 3

def dependencies
  @dependencies
end

Instance Method Details

#compute_similarity_score(sample, reversed = false) ⇒ Object 



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# File 'lib/gemstat/population.rb', line 18

def compute_similarity_score(sample, reversed = false)
  result = {}
  @dependencies.each do |item|
    score = 1.0 / (1.0+((sample.gems + item.gems) - (sample.gems & item.gems)).uniq.count)
    if score > 1.0/(1.0+sample.gems.count) then
      result[item.gem_name] = {:score => score, :gems => item.gems}
    end
  end
  reversed ? result = result.sort{|a,b| a[1][:score] <=> b[1][:score]} : result = result.sort{|a,b| b[1][:score] <=> a[1][:score]}
end