Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/rgen/array_extensions.rb

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args) ⇒ Object 



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# File 'lib/rgen/array_extensions.rb', line 12

def method_missing(m, *args)

  # This extensions has the side effect that it allows to call any method on any
  # empty array with an empty array as the result. This behavior is required for
  # navigating models.
  #
  # This is a problem for Hash[] called with an (empty) array of tupels.
  # It will call to_hash expecting a Hash as the result. When it gets an array instead,
  # it fails with an exception. Make sure it gets a NoMethodException as without this
  # extension and it will catch that and return an empty hash as expected.
  #
  # Similar problems exist for other Ruby built-in methods which are expected to fail.
  #
  return super unless (size == 0 && 
    m != :to_hash && m != :to_str) ||
    compact.any?{|e| e.is_a? RGen::MetamodelBuilder::MMBase}
  # use an array to build the result to achiev similar ordering
  result = []
  inResult = {}
  compact.each do |e|
    if e.is_a? RGen::MetamodelBuilder::MMBase        
      ((o=e.send(m)).is_a?(Array) ? o : [o] ).each do |v|
        next if inResult[v.object_id]
        inResult[v.object_id] = true
        result << v
      end
    else
      raise StandardError.new("Trying to call a method on an array element not a RGen MMBase")
    end
  end
  result.compact
end

Instance Method Details

#>>(method) ⇒ Object 



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# File 'lib/rgen/array_extensions.rb', line 8

def >>(method)
  compact.inject([]) { |r,e| r | ( (o=e.send(method)).is_a?(Array) ? o : [o] ) }
end