Class: Realize::Logical::Switch

Inherits:
Object
  • Object
show all
Defined in:
lib/realize/logical/switch.rb,
lib/realize/logical/switch/case.rb

Overview

This type of transformer can be categorized as a “comparator”, meaning its intended desire is not a value resolution or value formatting, but a branching resolution. Specifically, you can define cases where, if the value matches, the transformers for the case would be executed. If no case is matched then the default_transformers will be executed.

Defined Under Namespace

Classes: Case

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key:, cases: [], default_transformers: []) ⇒ Switch

Returns a new instance of Switch.

Raises:

  • (ArgumentError) 


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# File 'lib/realize/logical/switch.rb', line 24

def initialize(key:, cases: [], default_transformers: [])
  raise ArgumentError, 'key is required' if key.to_s.empty?

  @cases                = Case.array(cases)
  @default_transformers = Transformers.array(default_transformers)
  @key                  = key

  freeze
end

Instance Attribute Details

#cases ⇒ Object (readonly)

Returns the value of attribute cases.



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# File 'lib/realize/logical/switch.rb', line 22

def cases
  @cases
end

#default_transformers ⇒ Object (readonly)

Returns the value of attribute default_transformers.



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# File 'lib/realize/logical/switch.rb', line 22

def default_transformers
  @default_transformers
end

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/realize/logical/switch.rb', line 22

def key
  @key
end

Instance Method Details

#transform(resolver, value, time, record) ⇒ Object 



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# File 'lib/realize/logical/switch.rb', line 34

def transform(resolver, value, time, record)
  resolved_value = resolver.get(record, key)
  matched_case   = cases.find { |c| c.match?(resolved_value) }
  transformers   = matched_case ? matched_case.transformers : default_transformers

  return value if transformers.empty?

  transformers.inject(value) do |memo, transformer|
    transformer.transform(resolver, memo, time, record)
  end
end