Class: Rod::AbstractModel

Inherits:
Object
  • Object
show all
Defined in:
lib/rod/abstract_model.rb

Overview

A base class for all classes stored in the DataBase (both user defined and DB defined).

Direct Known Subclasses

JoinElement, Model, StringElement

Class Method Summary collapse

Class Method Details

.build_structure ⇒ Object

By default nothing is built.



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# File 'lib/rod/abstract_model.rb', line 30

def self.build_structure
end

.cache ⇒ Object

Default cache for models.



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# File 'lib/rod/abstract_model.rb', line 34

def self.cache
  @cache ||= Cache.new
end

.compatible?(metadata) ⇒ Boolean

Checks if the metadata are compatible with the class definition.

Returns:

  • (Boolean) 


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# File 'lib/rod/abstract_model.rb', line 56

def self.compatible?(metadata)
  self.difference(metadata).empty?
end

.difference(metadata) ⇒ Object

Calculates the difference between the classes metadata and the metadata provided.



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# File 'lib/rod/abstract_model.rb', line 62

def self.difference(metadata)
  my_metadata = self.metadata
  other_metadata = metadata.dup
  other_metadata.delete(:count)
  result = []
  my_metadata.each do |type,values|
    # TODO #161 the order of properties should be preserved for the
    # whole class, not only for each type of properties.
    if [:fields,:has_one,:has_many].include?(type)
      values.to_a.zip(other_metadata[type].to_a) do |meta1,meta2|
        if meta1 != meta2
          result << [meta2,meta1]
        end
      end
    else
      if other_metadata[type] != values
        result << [other_metadata[type],values]
      end
    end
  end
  result
end

.fields ⇒ Object

By default there are no fields.



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# File 'lib/rod/abstract_model.rb', line 25

def self.fields
  []
end

.indexed_properties ⇒ Object

There are no indexed properties.



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# File 'lib/rod/abstract_model.rb', line 39

def self.indexed_properties
  []
end

.layout ⇒ Object

Default implementation prints nothing.



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# File 'lib/rod/abstract_model.rb', line 21

def self.layout
end

.metadata ⇒ Object

Returns meta-data (in the form of a hash) for the model.



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# File 'lib/rod/abstract_model.rb', line 49

def self.metadata
  meta = {}
  meta[:superclass] = self.superclass.name
  meta
end

.path_for_data(path) ⇒ Object

Path to the file storing the model data.



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# File 'lib/rod/abstract_model.rb', line 16

def self.path_for_data(path)
  "#{path}#{self.struct_name}.dat"
end

.properties ⇒ Object

By default properties are empty.



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# File 'lib/rod/abstract_model.rb', line 44

def self.properties
  []
end

.struct_name ⇒ Object

C-struct name of the model.

Raises:



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# File 'lib/rod/abstract_model.rb', line 11

def self.struct_name
  raise RodException.new("#typdef_struct called for AbstractModel")
end

.typedef_struct ⇒ Object

Empty string.

Raises:



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# File 'lib/rod/abstract_model.rb', line 6

def self.typedef_struct
  raise RodException.new("#typdef_struct called for AbstractModel")
end