Module: Puppet::Confine::Boolean

Included in:
False, True
Defined in:
lib/puppet/confine/boolean.rb

Instance Method Summary collapse

Instance Method Details

#passing_valueObject

Returns the passing value for the Boolean confine.

Raises:

  • (NotImplementedError)

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# File 'lib/puppet/confine/boolean.rb', line 8

def passing_value
  raise NotImplementedError, "The Boolean confine %{confine} must provide the passing value." % { confine: self.class.name }
end

#valuesObject

The Boolean confines 'true' and 'false' let the user specify two types of values:

* A lambda for lazy evaluation. This would be something like
    confine :true => lambda { true }

* A single Boolean value, or an array of Boolean values. This would
be something like
    confine :true => true OR confine :true => [true, false, false, true]

This override distinguishes between the two cases.


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# File 'lib/puppet/confine/boolean.rb', line 22

def values
  # Note that Puppet::Confine's constructor ensures that @values
  # will always be an array, even if a lambda's passed in. This is
  # why we have the length == 1 check.
  unless @values.length == 1 && @values.first.respond_to?(:call)
    return @values
  end

  # We have a lambda. Here, we want to enforce "cache positive"
  # behavior, which is to cache the result _if_ it evaluates to
  # the passing value (i.e. the class name).

  return @cached_value unless @cached_value.nil?

  # Double negate to coerce the value into a Boolean
  calculated_value = !! @values.first.call
  if calculated_value == passing_value
    @cached_value = [calculated_value]
  end

  [calculated_value]
end