Class: Puppet::Network::Format

Inherits:
Object
  • Object
show all
Includes:
Confiner
Defined in:
lib/puppet/network/format.rb

Overview

A simple class for modeling encoding formats for moving instances around the network.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Confiner

#confine, #confine_collection, #suitable?

Constructor Details

#initialize(name, options = {}, &block) ⇒ Format

Returns a new instance of Format.

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/network/format.rb', line 20

def initialize(name, options = {}, &block)
  @name = name.to_s.downcase.intern

  @options = options

  # This must be done early the values can be used to set required_methods
  define_method_names

  method_list = {
    :intern_method => "from_#{name}",
    :intern_multiple_method => "from_multiple_#{name}",
    :render_multiple_method => "to_multiple_#{name}",
    :render_method => "to_#{name}"
  }

  init_attribute(:mime, "text/#{name}")
  init_attribute(:weight, 5)
  init_attribute(:required_methods, method_list.keys)
  init_attribute(:extension, name.to_s)

  method_list.each do |method, value|
    init_attribute(method, value)
  end

  raise ArgumentError, "Unsupported option(s) #{@options.keys}" unless @options.empty?

  @options = nil

  instance_eval(&block) if block_given?
end

Instance Attribute Details

#extension ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 9

def extension
  @extension
end

#intern_method ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 9

def intern_method
  @intern_method
end

#intern_multiple_method ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 9

def intern_multiple_method
  @intern_multiple_method
end

#mime ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 8

def mime
  @mime
end

#name ⇒ Object (readonly) 



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# File 'lib/puppet/network/format.rb', line 8

def name
  @name
end

#render_method ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 9

def render_method
  @render_method
end

#render_multiple_method ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 9

def render_multiple_method
  @render_multiple_method
end

#required_methods ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 9

def required_methods
  @required_methods
end

#weight ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 9

def weight
  @weight
end

Instance Method Details

#init_attribute(name, default) ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 11

def init_attribute(name, default)
  if value = @options[name]
    @options.delete(name)
  else
    value = default
  end
  self.send(name.to_s + "=", value)
end

#intern(klass, text) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/puppet/network/format.rb', line 51

def intern(klass, text)
  return klass.send(intern_method, text) if klass.respond_to?(intern_method)
  raise NotImplementedError, "#{klass} does not respond to #{intern_method}; can not intern instances from #{mime}"
end

#intern_multiple(klass, text) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/puppet/network/format.rb', line 56

def intern_multiple(klass, text)
  return klass.send(intern_multiple_method, text) if klass.respond_to?(intern_multiple_method)
  raise NotImplementedError, "#{klass} does not respond to #{intern_multiple_method}; can not intern multiple instances from #{mime}"
end

#render(instance) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/puppet/network/format.rb', line 65

def render(instance)
  return instance.send(render_method) if instance.respond_to?(render_method)
  raise NotImplementedError, "#{instance.class} does not respond to #{render_method}; can not render instances to #{mime}"
end

#render_multiple(instances) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/puppet/network/format.rb', line 70

def render_multiple(instances)
  # This method implicitly assumes that all instances are of the same type.
  return instances[0].class.send(render_multiple_method, instances) if instances[0].class.respond_to?(render_multiple_method)
  raise NotImplementedError, "#{instances[0].class} does not respond to #{render_multiple_method}; can not intern multiple instances to #{mime}"
end

#required_methods_present?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/network/format.rb', line 76

def required_methods_present?(klass)
  [:intern_method, :intern_multiple_method, :render_multiple_method].each do |name|
    return false unless required_method_present?(name, klass, :class)
  end

  return false unless required_method_present?(:render_method, klass, :instance)

  true
end

#supported?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/network/format.rb', line 86

def supported?(klass)
  suitable? and required_methods_present?(klass)
end

#to_s ⇒ Object 



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# File 'lib/puppet/network/format.rb', line 90

def to_s
  "Puppet::Network::Format[#{name}]"
end