Class: Puppet::Pops::UniqueMergeStrategy

Inherits:
MergeStrategy show all
Defined in:
lib/puppet/pops/merge_strategy.rb

Overview

Merges two values that must be either scalar or arrays into a unique set of values.

Scalar values will be converted into a one element arrays and array values will be flattened prior to forming the unique set. The order of the elements is preserved with e1 being the first contributor of elements and e2 the second.

Constant Summary collapse

INSTANCE = 
self.new(EMPTY_HASH)

Constants inherited from MergeStrategy

MergeStrategy::NOT_FOUND

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from MergeStrategy

add_strategy, #configuration, #initialize, #lookup, merge, #merge, #merge_lookup, #options, options_t, strategy, strategy_keys

Constructor Details

This class inherits a constructor from Puppet::Pops::MergeStrategy

Class Method Details

.key ⇒ Object 



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# File 'lib/puppet/pops/merge_strategy.rb', line 281

def self.key
  :unique
end

Instance Method Details

#checked_merge(e1, e2) ⇒ Array<Object>

Returns The unique set of elements.

Parameters:

  • e1 (Array<Object>) —

    The first array

  • e2 (Array<Object>) —

    The second array

Returns:

  • (Array<Object>) —

    The unique set of elements



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# File 'lib/puppet/pops/merge_strategy.rb', line 289

def checked_merge(e1, e2)
  convert_value(e1) | convert_value(e2)
end

#convert_value(e) ⇒ Object 



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# File 'lib/puppet/pops/merge_strategy.rb', line 293

def convert_value(e)
  e.is_a?(Array) ? e.flatten : [e]
end

#merge_single(value) ⇒ Object

If value is an array, then return the result of calling ‘uniq` on that array. Otherwise, the argument is returned.

Parameters:

  • value (Object) —

    the value to merge with nothing

Returns:

  • (Object) —

    the merged value



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# File 'lib/puppet/pops/merge_strategy.rb', line 301

def merge_single(value)
  value.is_a?(Array) ? value.uniq : value
end