Class: Icss::RecordType

Inherits:
NamedType show all
Defined in:
lib/icss/type.rb,
lib/icss/type/factory.rb

Overview

Icss/Avro Record type

Records use the type name “record” and support these attributes:

  • name: a string providing the name of the record (required).

  • namespace: a string that qualifies the name;

  • doc: a string providing documentation to the user of this schema (optional).

  • fields: an array of RecordField’s (required).

For example, a linked-list of 64-bit values may be defined with:

{
  "type": "record",
  "name": "LongList",
  "fields" : [
    {"name": "value", "type": "long"},             // each element has a long
    {"name": "next", "type": ["LongList", "null"]} // optional next element
  ]
}

Direct Known Subclasses

ErrorType

Constant Summary

Constants inherited from Type

Type::PRIMITIVE_TYPES

Instance Attribute Summary

Attributes inherited from NamedType

#parent

Instance Method Summary collapse

Methods inherited from NamedType

#fullname, #name=, #namespace, #receive_namespace

Methods included from Validations

#validate_name, #validate_namespace

Methods inherited from Type

find, pig_name, primitive?, #primitive?, #title, #to_json

Instance Method Details

#decorate_with_conveniences(klass) ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 168

def decorate_with_conveniences klass
  klass.send :include, Receiver::ActsAsHash
end

#decorate_with_receivers(klass) ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 162

def decorate_with_receivers klass
  fields.each do |field|
    field.define_receiver_on(klass)
  end
end

#define_klass ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 145

def define_klass
  ensure_parent_modules!
  parent_module = ruby_klass_parent
  klass_basename = ruby_klass_scope_names.last.to_sym
  klass   = parent_module.const_get(klass_basename) rescue nil
  klass ||= parent_module.const_set(klass_basename, Class.new(::Icss::MetaType))
  klass
end

#ensure_parent_modules! ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 136

def ensure_parent_modules!
  ruby_klass_scope_names[0..-2].inject(Object) do |parent_module, module_name|
    new_parent   = "::#{parent_module}::#{module_name}".constantize rescue nil
    new_parent ||= parent_module.const_set(module_name.to_sym, Module.new)
    # p [parent_module, new_parent, module_name]
    new_parent
  end
end

#ruby_klass ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 154

def ruby_klass
  return @klass if @klass
  klass = define_klass
  decorate_with_receivers(klass)
  decorate_with_conveniences(klass)
  @klass = klass
end

#ruby_klass_name ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 129

def ruby_klass_name
  "::" + ruby_klass_scope_names.join('::')
end

#ruby_klass_parent ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 132

def ruby_klass_parent
  ("::" + ruby_klass_scope_names[0..-2].join('::')).constantize
end

#ruby_klass_scope_names ⇒ Object 



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# File 'lib/icss/type/factory.rb', line 126

def ruby_klass_scope_names
  fullname.split('.').map(&:camelize)
end

#to_hash ⇒ Object 



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# File 'lib/icss/type.rb', line 345

def to_hash
  super.merge( :fields => (fields||[]).map{|field| field.to_hash} )
end