Class: Moonshot::ParameterCollection

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/moonshot/parameter_collection.rb

Overview

A Rigid Hash-like structure that only accepts manipulation of parameters defined in the Stack template. Anything else results in an exception.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ParameterCollection

Returns a new instance of ParameterCollection.



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# File 'lib/moonshot/parameter_collection.rb', line 23

def initialize
  @hash = {}
end

Instance Attribute Details

#hash ⇒ Object (readonly)

Returns the value of attribute hash.



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# File 'lib/moonshot/parameter_collection.rb', line 11

def hash
  @hash
end

Class Method Details

.from_template(template) ⇒ Object 



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# File 'lib/moonshot/parameter_collection.rb', line 13

def self.from_template(template)
  obj = new

  template.parameters.each do |stack_parameter|
    obj.add(stack_parameter)
  end

  obj
end

Instance Method Details

#[]=(key, value) ⇒ Object 



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# File 'lib/moonshot/parameter_collection.rb', line 27

def []=(key, value)
  raise "Invalid StackParameter #{key}!" unless @hash.key?(key)

  @hash[key].set(value)
end

#add(parameter) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/moonshot/parameter_collection.rb', line 33

def add(parameter)
  raise ArgumentError, 'Can only add StackParameters!' unless parameter.is_a?(StackParameter)

  @hash[parameter.name] = parameter
end

#missing_for_create ⇒ Object

What parameters are missing for a CreateStack call, where UsePreviousValue has no meaning.



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# File 'lib/moonshot/parameter_collection.rb', line 41

def missing_for_create
  # If we haven't set a value, and there is no default, we can't
  # create the stack.
  @hash.values.select { |v| !v.set? && !v.default? }
end

#missing_for_update ⇒ Object 



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# File 'lib/moonshot/parameter_collection.rb', line 47

def missing_for_update
  # If we don't have a previous value to use, we haven't set a
  # value, and there is no default, we can't update a stack.
  @hash.values.select { |v| !v.set? && !v.default? && !v.use_previous? }
end