Class: BackReferences

Inherits:
Object
  • Object
show all
Defined in:
lib/ObjectModel/AnEntity/BackReferences.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(entity_id) ⇒ BackReferences

Returns a new instance of BackReferences.



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 2

def initialize entity_id
	@entity_id, @array = entity_id, []
end

Class Method Details

.delete(e, storage) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 92

def delete e, storage
	storage[:back_references].filter(:entity_id => e.entity_id).delete
end

.delete_all_references_to(e, c, &callback) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 108

def delete_all_references_to e, c, &callback
	array = c.back_references._array.dup
	array.each{|entity_id| callback.call entity_id}						
end

.delete_backreference(entity, reference, reference_copy) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 96

def delete_backreference entity, reference, reference_copy
	br = reference_copy.back_references
	index = br._array.index entity.entity_id
	index.should! :>=, 0
	br._array.delete_at index
end

.initialize_copy(e, c) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 68

def initialize_copy e, c
	c.back_references = BackReferences.new e.entity_id
	c.back_references._array.replace e.back_references._array
end

.initialize_entity(e) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 73

def initialize_entity e
	e.instance_variable_set "@back_references", BackReferences.new(e.entity_id)
end

.initialize_storage(db) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 33

def initialize_storage db
	db.create_table :back_references do
		column :entity_id, :text
		column :referrer_id, :text
		
#				index :entity_id
	end
end

.load(e, storage) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 48

def load e, storage
	rows = storage[:back_references].filter :entity_id => e.entity_id

	br = if rows.count > 0
		br = BackReferences.new e.entity_id
		rows.each do |row|
			br._array << EntityType.load_id(row[:referrer_id])
		end
		br
	else
		BackReferences.new e.entity_id
	end
#						p [e, br._array]
	e.instance_variable_set "@back_references", br
end

.new_backreference(entity, reference, reference_copy) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 103

def new_backreference entity, reference, reference_copy
	br = reference_copy.back_references			
	br._array << entity.entity_id			
end

.persist(c, entity_id, storage) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 77

def persist c, entity_id, storage
	# TODO reimplement more efficiently			
	br = c.back_references
	storage[:back_references].filter(:entity_id => entity_id).delete
	if br._array.size > 0					
		br._array.each do |ref_id|		
			ref_id.should_not! :be_nil
			storage[:back_references].insert(
																			:entity_id => entity_id, 
																			:referrer_id => EntityType.dump_id(ref_id)
			)
		end								
	end									
end

.print_storage(db, name) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 42

def print_storage db, name
	return unless name == nil or name == :back_references
	puts "\nBackReferences:"
	db[:back_references].print
end

.write_back(copy, entity) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 64

def write_back copy, entity
	entity.back_references._array.replace copy.back_references._array # TODO reimplement more efficiently
end

Instance Method Details

#_array ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 28

def _array
	@array
end

#each(&b) ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 6

def each &b
	tr = Thread.current[:om_transaction]
	if tr and tr.changed? @entity_id
		br = tr.copies[@entity_id].back_references			
		br._array.each{|entity_id| b.call tr.resolve(entity_id)}
	else
		self._array.each{|entity_id| b.call @om_repository.by_id(entity_id)}
	end		
end

#size ⇒ Object 



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# File 'lib/ObjectModel/AnEntity/BackReferences.rb', line 16

def size
	if tr = Thread.current[:om_transaction]			
		if tr.changed? @entity_id
			tr.copies[@entity_id].back_references._array.size
		else
			@array.size
		end
	else
		@array.size
	end
end