Class: ActiveFacts::Metamodel::Unit

Inherits:
Object
  • Object
show all
Defined in:
lib/activefacts/generate/cql.rb,
lib/activefacts/vocabulary/metamodel.rb,
lib/activefacts/vocabulary/extensions.rb

Instance Method Summary collapse

Instance Method Details

#as_cql ⇒ Object 



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# File 'lib/activefacts/generate/cql.rb', line 667

def as_cql
  if !ephemera_url
    if coefficient
      # REVISIT: Use a smarter algorithm to switch to exponential form when there'd be lots of zeroes.
      coefficient.numerator.to_s('F') +

      if d = coefficient.denominator and d != 1
        "/#{d}"
	    else
 ''
      end +

      ' '
    else
      '1 '
    end
	else
	  ''
  end +

	all_derivation_as_derived_unit.
	  sort_by{|d| d.base_unit.name}.
    # REVISIT: Sort base units
    # REVISIT: convert negative powers to division?
    map do |der|
      base = der.base_unit
      "#{base.name}#{der.exponent and der.exponent != 1 ? "^#{der.exponent}" : ''} "
    end*'' +

  if o = offset and o != 0
    "+ #{o.to_s('F')} "
	else
	  ''
  end +

  "converts to #{name}#{plural_name ? '/'+plural_name : ''}" +

	(coefficient && !coefficient.is_precise ?  ' approximately' : '') +

	(ephemera_url ? " ephemera #{ephemera_url}" : '') +

  ';'
end

#describe ⇒ Object 



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# File 'lib/activefacts/vocabulary/extensions.rb', line 170

def describe
  'Unit' +
  name +
  (plural_name ? '/'+plural_name : '') +
  '=' +
  coefficient.to_s+'*' +
  all_derivation_as_derived_unit.map do |derivation|
    derivation.base_unit.name +
    (derivation.exponent != 1 ? derivation.exponent.to_s : '')
  end.join('') +
  (offset ? ' + '+offset.to_s : '')
end