Class: Unimatrix::Activist::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/unimatrix/activist/parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(content = {}) {|_self| ... } ⇒ Parser

Returns a new instance of Parser.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/unimatrix/activist/parser.rb', line 5

def initialize( content = {} )
  @content = content
  yield self if block_given?
end

Instance Method Details

#associations ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 32

def associations
  @content.include?( '$associations' ) ?
    @content[ '$associations' ] :
    nil
end

#key ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 22

def key
  'id'
end

#keys ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 26

def keys
  @content.include?( '$this' ) ?
    @content[ '$this' ][ 'ids' ] :
    nil
end

#name ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 10

def name
  @content.include?( '$this' ) ?
    @content[ '$this' ][ 'name' ] :
    nil
end

#parse_resource(name, attributes) ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 49

def parse_resource( name, attributes )
  @resources_mutex ||= Hash.new { | hash, key | hash[ key ] = [] }
  object_key = attributes[ key ]

  # Lock the resource index for this name/key combination
  # This prevents objects that are associated with
  # themselves from causing a stack overflow
  return nil if @resources_mutex[ name ].include?( object_key )

  @resources_mutex[ name ].push( object_key )
  resource = nil

  if attributes.present?
    class_name = name.singularize.camelize
    object_class = Unimatrix::Activist.const_get( class_name ) rescue nil

    if object_class.present?
      relations = name == self.name ?
                    self.parse_associations( attributes ) : []
      resource = object_class.new( attributes, relations )
    end
    @resources_mutex[ name ].delete( object_key )
  end
  resource
end

#resource_associations_by(name, key) ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 121

def resource_associations_by( name, key )
  result = Hash.new { | hash, key | hash[ key ] = [] }
  associations = self.associations
  if associations && associations.include?( name )
    association = associations[ name ].detect do | association |
      association[ 'id' ] == key
    end
    if association.present?
      association.each do | key, value |
        unless key == 'id'
          type_name = value[ 'type_name' ]
          result[ key ] = ( value[ 'ids' ] || [] ).map do | associated_id |
            self.resource_by(
              key,
              associated_id,
              { 'type_name' => type_name }
            )
          end
          result[ key ].compact!
        end
      end
    end
  end
  result
end

#resource_attribute_index ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 147

def resource_attribute_index
  @resource_attribute_index ||= begin
    index = Hash.new { | hash, key | hash[ key ] = {} }
    @content.each do | key, resources_attributes |
      unless key[0] == '$'
        resources_attributes.each do | resource_attributes |
          index[ key ][ resource_attributes[ 'id' ] ] = resource_attributes
        end
      end
    end
    index
  end
end

#resource_by(name, key, options = {}) ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 75

def resource_by( name, key, options = {} )

  @resources_index ||= Hash.new { | hash, key | hash[ key ] = {} }
  @resource_index_mutex ||= Hash.new { | hash, key | hash[ key ] = [] }

  @resources_index[ name ][ key ] ||= begin

    # lock the resource index for this name/key combination
    # note: this prevents Unimatrix::Activist objects that are associated with
    #       themselves from causing a stack overflow
    return nil if @resource_index_mutex[ name ].include?( key )
    @resource_index_mutex[ name ].push( key )

    result = nil
    resource_attributes = resource_attribute_index[ name ][ key ]
    if resource_attributes.present?
      type_name = resource_attributes[ 'type_name' ].camelize
      klass = ( Unimatrix::Activist.const_get( options[ 'type_name' ].camelize ) rescue nil )

      #Create specific class if not already defined
      if type_name.present? && !Unimatrix::Activist.const_defined?( type_name )
        typed_klass = Class.new( klass )
        klass = Unimatrix::Activist.const_set( type_name , typed_klass )
      
      elsif Unimatrix::Activist.const_defined?( type_name )
        klass = Unimatrix::Activist.const_get( type_name )
      
      end

      if klass.present?
        result = klass.new(
          resource_attributes,
          self.resource_associations_by( name, key )
        )
      end
    end

    # unlock the resource index for this name/key combination
    @resource_index_mutex[ name ].delete( key )

    result

  end

end

#resources ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 38

def resources
  result = nil

  unless self.name.blank?
    result = self.keys.map do | key |
      self.resource_by( name, key, { 'type_name' => self.type_name } )
    end
  end
  result
end

#type_name ⇒ Object 



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# File 'lib/unimatrix/activist/parser.rb', line 16

def type_name
  @content.include?( '$this' ) ?
    @content[ '$this' ][ 'type_name' ] :
    nil
end