Class: Tdc::DefinitionResolvers::TagResolver

Inherits:
DefinitionResolver show all
Defined in:
lib/tdc/definition_resolvers/tag_resolver.rb

Overview

Knows how to resolve the tag value for the specified instance_definition key by replacing it with an object sourced from the current catalog.

Instance Attribute Summary collapse

Attributes inherited from DefinitionResolver

#current_catalog

Instance Method Summary collapse

Methods inherited from DefinitionResolver

#configure_current_catalog

Constructor Details

#initialize(key:, source:) ⇒ TagResolver

Returns a new instance of TagResolver.



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# File 'lib/tdc/definition_resolvers/tag_resolver.rb', line 10

def initialize(key:, source:)
  @key = key
  @source = source
end

Instance Attribute Details

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/tdc/definition_resolvers/tag_resolver.rb', line 8

def key
  @key
end

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/tdc/definition_resolvers/tag_resolver.rb', line 8

def source
  @source
end

Instance Method Details

#resolve(instance_definition) ⇒ Object 



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# File 'lib/tdc/definition_resolvers/tag_resolver.rb', line 15

def resolve(instance_definition)
  return unless instance_definition.key?(key)

  # Lookup the source catalog entry in the current_catalog.
  catalog_entry = instance_eval("current_catalog.#{source}", __FILE__, __LINE__)

  # Before resolution the instance definition value is a tag.
  tag = instance_definition[key]

  unresolvable_tag(tag, catalog_entry) unless tag

  # Use the tag to source an object from the current catalog.
  sourced_object = catalog_entry.send(tag)

  unresolvable_tag(tag, catalog_entry) unless sourced_object

  # Replace the tag value with the sourced object.
  instance_definition[key] = sourced_object
end