Class: OData::ClassBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_odata/class_builder.rb

Overview

Internal helper class for building a dynamic class. This class shouldn't be called directly.

Instance Method Summary collapse

Constructor Details

#initialize(klass_name, methods, nav_props, context, namespace = nil) ⇒ ClassBuilder

Creates a new instance of the ClassBuilder class

Parameters:

  • klass_name (String) —

    the name/type of the class to create

  • methods (Array) —

    the accessor methods to add to the class

  • nav_props (Array) —

    the accessor methods to add for navigation properties

  • context (Service) —

    the service context that this entity belongs to

  • namespace (String, nil) (defaults to: nil) —

    optional namespace to create the classes in



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# File 'lib/ruby_odata/class_builder.rb', line 11

def initialize(klass_name, methods, nav_props, context, namespace = nil)
  @klass_name = klass_name.camelcase
  @methods = methods
  @nav_props = nav_props
  @context = context
  @namespace = namespace
end

Instance Method Details

#build ⇒ Object

Returns a dynamically generated class definition based on the constructor parameters



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# File 'lib/ruby_odata/class_builder.rb', line 20

def build
  # return if already built
  return @klass unless @klass.nil?

  # need the class name to build class
  return nil    if @klass_name.nil?

  # return if we can find constant corresponding to class name
  already_defined = eval("defined?(#{@klass_name}) == 'constant' and #{@klass_name}.class == Class")
  if already_defined
    @klass = @klass_name.constantize
    return @klass
  end

  if @namespace
    namespaces = @namespace.split(/\.|::/)

    namespaces.each_with_index do |ns, index|
      if index == 0
        next if Object.const_defined? ns
        Object.const_set(ns, Module.new)
      else
        current_ns = namespaces[0..index-1].join '::'
        next if eval "#{current_ns}.const_defined? '#{ns}'"
        eval "#{current_ns}.const_set('#{ns}', Module.new)"
      end
    end

    klass_constant = @klass_name.split('::').last
    eval "#{namespaces.join '::'}.const_set('#{klass_constant}', Class.new.extend(ActiveSupport::JSON))"
  else
    Object.const_set(@klass_name, Class.new.extend(ActiveSupport::JSON))
  end

  @klass = @klass_name.constantize
  @klass.class_eval do
    include OData
  end

  add_initializer(@klass)
  add_methods(@klass)
  add_nav_props(@klass)
  add_class_methods(@klass)

  return @klass
end