Class: DataShift::Transformation::Factory

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/datashift/transformation/factory.rb

Constant Summary collapse

TRANSFORMERS_HASH_INSTANCE_NAMES = 
[:default, :override, :substitution, :prefix, :postfix].freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logging

#logdir, #logdir=, #logger, #verbose

Constructor Details

#initialize ⇒ Factory

Returns a new instance of Factory.



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# File 'lib/datashift/transformation/factory.rb', line 81

def initialize
  clear
end

Instance Attribute Details

#defaults ⇒ Object (readonly)

Returns the value of attribute defaults.



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# File 'lib/datashift/transformation/factory.rb', line 78

def defaults
  @defaults
end

#overrides ⇒ Object (readonly)

Returns the value of attribute overrides.



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# File 'lib/datashift/transformation/factory.rb', line 78

def overrides
  @overrides
end

#postfixes ⇒ Object (readonly)

Returns the value of attribute postfixes.



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# File 'lib/datashift/transformation/factory.rb', line 79

def postfixes
  @postfixes
end

#prefixes ⇒ Object (readonly)

Returns the value of attribute prefixes.



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# File 'lib/datashift/transformation/factory.rb', line 79

def prefixes
  @prefixes
end

#substitutions ⇒ Object (readonly)

Returns the value of attribute substitutions.



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# File 'lib/datashift/transformation/factory.rb', line 78

def substitutions
  @substitutions
end

Class Method Details

.instance(locale = :en) ⇒ Object 



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# File 'lib/datashift/transformation/factory.rb', line 70

def self.instance(locale = :en)
  @__instance__[locale] ||= new
end

.reset(locale = :en) ⇒ Object 



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# File 'lib/datashift/transformation/factory.rb', line 74

def self.reset(locale = :en)
  @__instance__[locale] = new
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/datashift/transformation/factory.rb', line 85

def clear
  TRANSFORMERS_HASH_INSTANCE_NAMES.each do|h|
    instance_variable_set("@#{h.to_s.pluralize}", ActiveSupport::HashWithIndifferentAccess.new({}))
  end
end

#configure_from(load_object_class, yaml_file, locale_key = nil) ⇒ Object

Default values and over rides per class can be provided in YAML config file.

The locale_key for situations where the Class one level down, for example as per our own Template for Datashift Import/Export Configuration which has format :

key:

klass:



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# File 'lib/datashift/transformation/factory.rb', line 99

def configure_from(load_object_class, yaml_file, locale_key = nil)

  data = YAML.load( ERB.new( IO.read(yaml_file) ).result )

  class_name = load_object_class.name

  data = data[locale_key] if(locale_key)

  configure_from_yaml(load_object_class, data[class_name]) if(data[class_name])
end

#configure_from_yaml(load_object_class, yaml) ⇒ Object 



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# File 'lib/datashift/transformation/factory.rb', line 110

def configure_from_yaml(load_object_class, yaml)

  setter_method_map = {
    defaults: :set_default_on,
    overrides: :set_override_on,
    substitutions: :set_substitution_on_list,
    prefixes: :set_prefix_on,
    postfixes: :set_postfix_on
  }

  setter_method_map.each do |key, call|
    settings = yaml[key.to_s]

    settings.each do |operator, value|
      logger.info("Configuring Transform [#{key}] for [#{operator.inspect}] to [#{value}]")
      send( call, load_object_class, operator, value)
    end if(settings && settings.is_a?(Hash))
  end

end

#hash_key(key) ⇒ Object 



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# File 'lib/datashift/transformation/factory.rb', line 131

def hash_key(key)
  return key if(key.is_a? String)
  return key.class_name if(key.is_a? MethodBinding)
  key.name # Class name
end

#set_substitution(method_binding, rule, replacement) ⇒ Object 



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# File 'lib/datashift/transformation/factory.rb', line 197

def set_substitution( method_binding, rule, replacement )
  set_substitution_on( method_binding, method_binding.operator, rule, replacement)
end

#set_substitution_on(key, operator, rule, replacement) ⇒ Object 



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# File 'lib/datashift/transformation/factory.rb', line 201

def set_substitution_on(key, operator, rule, replacement )
  substitutions_for(key)[operator] = Struct::Substitution.new(rule, replacement)
end