Class: StackCommander::DependencyInjection

Inherits:
Object
  • Object
show all
Defined in:
lib/stack_commander/dependency_injection.rb

Constant Summary collapse

InvalidScope = 
Class.new(StandardError)

Instance Method Summary collapse

Constructor Details

#initialize(klass) ⇒ DependencyInjection 



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# File 'lib/stack_commander/dependency_injection.rb', line 5

def initialize(klass)
  @klass = klass
end

Instance Method Details

#extract(scope) ⇒ Object 



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# File 'lib/stack_commander/dependency_injection.rb', line 28

def extract(scope)
  match!(scope)

  required_parameters.map do |param|
    scope.public_send(param)
  end
end

#initialize_parameters ⇒ Object 



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# File 'lib/stack_commander/dependency_injection.rb', line 9

def initialize_parameters
  @klass.instance_method(:initialize).parameters
end

#match!(scope) ⇒ Object

Raises:



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# File 'lib/stack_commander/dependency_injection.rb', line 24

def match!(scope)
  raise InvalidScope, scope unless matches?(scope)
end

#matches?(scope) ⇒ Boolean 



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# File 'lib/stack_commander/dependency_injection.rb', line 18

def matches?(scope)
  required_parameters.all? do |param|
    scope.respond_to?(param)
  end
end

#required_parameters ⇒ Object 



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# File 'lib/stack_commander/dependency_injection.rb', line 13

def required_parameters
  _, parameters = initialize_parameters.transpose
  Array(parameters)
end