Class: Puppet::Pops::Types::PObjectType::PAttribute

Inherits:
PAnnotatedMember show all
Defined in:
lib/puppet/pops/types/p_object_type.rb

Overview

Describes a named Attribute in an Object type

Constant Summary

Constants included from Annotatable

Annotatable::TYPE_ANNOTATIONS

Instance Attribute Summary collapse

Attributes inherited from PAnnotatedMember

#container, #name, #type

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from PAnnotatedMember

#==, #accept, #assert_can_be_overridden, #assert_override, #create_dispatch, #feature_type, #final?, #hash, #invoke, #label, label, #override?

Methods included from Annotatable

#annotatable_accept, #annotations, #init_annotatable

Constructor Details

#initialize(name, container, init_hash) ⇒ PAttribute

Returns a new instance of PAttribute.

Parameters:

  • name (String) —

    The name of the attribute

  • container (PObjectType) —

    The containing object type

  • init_hash (Hash{String=>Object}) —

    Hash containing attribute options

Options Hash (init_hash):

  • 'type' (PAnyType) —

    The attribute type (required)

  • 'value' (Object) —

    The default value, must be an instanceof the given ‘type` (optional)

  • 'kind' (String) —

    The attribute kind, matching #TYPE_ATTRIBUTE_KIND



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# File 'lib/puppet/pops/types/p_object_type.rb', line 262

def initialize(name, container, init_hash)
  super(name, container, TypeAsserter.assert_instance_of(nil, TYPE_ATTRIBUTE, init_hash) { "initializer for #{self.class.label(container, name)}" })
  @kind = init_hash[KEY_KIND]
  if @kind == ATTRIBUTE_KIND_CONSTANT # final is implied
    if init_hash.include?(KEY_FINAL) && !@final
      raise Puppet::ParseError, "#{label} of kind 'constant' cannot be combined with final => false"
    end
    @final = true
  end

  if init_hash.include?(KEY_VALUE)
    if @kind == ATTRIBUTE_KIND_DERIVED || @kind == ATTRIBUTE_KIND_GIVEN_OR_DERIVED
      raise Puppet::ParseError, "#{label} of kind '#{@kind}' cannot be combined with an attribute value"
    end
    v = init_hash[KEY_VALUE]
    @value = v == :default ? v : TypeAsserter.assert_instance_of(nil, type, v) {"#{label} #{KEY_VALUE}" }
  else
    raise Puppet::ParseError, "#{label} of kind 'constant' requires a value" if @kind == ATTRIBUTE_KIND_CONSTANT
    @value = :undef # Not to be confused with nil or :default
  end
end

Instance Attribute Details

#kind ⇒ String? (readonly)

Returns The attribute kind as defined by #TYPE_ATTRIBUTE_KIND, or ‘nil`.

Returns:

  • (String, nil) —

    The attribute kind as defined by #TYPE_ATTRIBUTE_KIND, or ‘nil`



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# File 'lib/puppet/pops/types/p_object_type.rb', line 253

def kind
  @kind
end

Class Method Details

.feature_type ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/pops/types/p_object_type.rb', line 333

def self.feature_type
  'attribute'
end

Instance Method Details

#_pcore_init_hash ⇒ Hash{String=>Object}

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns the member as a hash suitable as an argument for constructor. Name is excluded

Returns:



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# File 'lib/puppet/pops/types/p_object_type.rb', line 296

def _pcore_init_hash
  hash = super
  unless @kind.nil?
    hash[KEY_KIND] = @kind
    hash.delete(KEY_FINAL) if @kind == ATTRIBUTE_KIND_CONSTANT # final is implied
  end
  hash[KEY_VALUE] = @value unless @value == :undef
  hash
end

#callable_type ⇒ Object 



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# File 'lib/puppet/pops/types/p_object_type.rb', line 284

def callable_type
  TYPE_ATTRIBUTE_CALLABLE
end

#constant? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/pops/types/p_object_type.rb', line 306

def constant?
  @kind == ATTRIBUTE_KIND_CONSTANT
end

#default_value?(value) ⇒ Booelan

Returns true if the given value equals the default value for this attribute.

Returns:

  • (Booelan) —

    true if the given value equals the default value for this attribute



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# File 'lib/puppet/pops/types/p_object_type.rb', line 311

def default_value?(value)
  @value == value
end

#eql?(o) ⇒ Boolean

Returns:

  • (Boolean) 


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

def eql?(o)
  super && @kind == o.kind && @value == (o.value? ? o.value : :undef)
end

#value ⇒ Object

Returns the value of this attribute, or raises an error if no value has been defined. Raising an error is necessary since a defined value may be ‘nil`.

Returns:

  • (Object) —

    the value that has been defined for this attribute.

Raises:



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# File 'lib/puppet/pops/types/p_object_type.rb', line 326

def value
  # An error must be raised here since `nil` is a valid value and it would be bad to leak the :undef symbol
  raise Puppet::Error, "#{label} has no value" if @value == :undef
  @value
end

#value? ⇒ Boolean

Returns ‘true` if a value has been defined for this attribute.

Returns:

  • (Boolean) —

    ‘true` if a value has been defined for this attribute.



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# File 'lib/puppet/pops/types/p_object_type.rb', line 316

def value?
  @value != :undef
end