Class: Dry::Core::Container::Item

Inherits:
Object
  • Object
show all
Defined in:
lib/dry/core/container/item.rb,
lib/dry/core/container/item/factory.rb,
lib/dry/core/container/item/callable.rb,
lib/dry/core/container/item/memoizable.rb

Overview

Base class to abstract Memoizable and Callable implementations

Direct Known Subclasses

Callable, Memoizable

Defined Under Namespace

Classes: Callable, Factory, Memoizable

Constant Summary collapse

NO_OPTIONS = 
{}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(item, options = NO_OPTIONS) ⇒ Item

Returns a new instance of Item.



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# File 'lib/dry/core/container/item.rb', line 20

def initialize(item, options = NO_OPTIONS)
  @item = item
  @options = {
    call: item.is_a?(::Proc) && item.parameters.empty?,
    **options
  }
end

Instance Attribute Details

#item ⇒ Mixed (readonly)

Returns the item to be solved later.

Returns:

  • (Mixed) —

    the item to be solved later



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# File 'lib/dry/core/container/item.rb', line 14

def item
  @item
end

#options ⇒ Hash (readonly)

Returns the options to memoize, call or no.

Returns:

  • (Hash) —

    the options to memoize, call or no.



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# File 'lib/dry/core/container/item.rb', line 17

def options
  @options
end

Instance Method Details

#call ⇒ Object

Raises:

  • (::NotImplementedError) 


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# File 'lib/dry/core/container/item.rb', line 29

def call
  raise ::NotImplementedError
end

#callable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dry/core/container/item.rb', line 39

def callable?
  options[:call]
end

#map(func) ⇒ Object

Build a new item with transformation applied



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# File 'lib/dry/core/container/item.rb', line 46

def map(func)
  if callable?
    self.class.new(-> { func.(item.call) }, options)
  else
    self.class.new(func.(item), options)
  end
end

#value? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dry/core/container/item.rb', line 34

def value?
  !callable?
end