Module: TaliaCore::ActiveSourceParts::PredicateHandler

Included in:
TaliaCore::ActiveSource
Defined in:
lib/talia_core/active_source_parts/predicate_handler.rb

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#each_cached_wrapper ⇒ Object

Loops through the cache and passes each existing wrapper to the block



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# File 'lib/talia_core/active_source_parts/predicate_handler.rb', line 82

def each_cached_wrapper
  return unless(@type_cache)
  @type_cache.each_value {  |wrap| yield(wrap) }
end

#get_objects_on(predicate) ⇒ Object

Returns the objects on the given predicate. This will be cached internally so that the object will always be the same as long as the parent source lives.



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# File 'lib/talia_core/active_source_parts/predicate_handler.rb', line 53

def get_objects_on(predicate)
  @type_cache ||= {}
  active_wrapper = @type_cache[predicate.to_s]

  if(active_wrapper.nil?)
    active_wrapper = SemanticCollectionWrapper.new(self, predicate)
    
    # If this is a prefetched source we have everything, so we can 
    # initialize the wrapper without loading anything
    active_wrapper.init_as_empty! if(@prefetched)
    
    @type_cache[predicate.to_s] = active_wrapper
  end
  
  active_wrapper
end

#has_type?(type) ⇒ Boolean

Returns if the Facsimile is of the given type

Returns:

  • (Boolean) 


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# File 'lib/talia_core/active_source_parts/predicate_handler.rb', line 46

def has_type?(type)
  (self.types.include?(type))
end

#inject_predicate(fat_relation) ⇒ Object

Injects a ‘fat’ predicate relation on a source



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# File 'lib/talia_core/active_source_parts/predicate_handler.rb', line 94

def inject_predicate(fat_relation)
  wrapper = get_objects_on(fat_relation.predicate_uri)
  wrapper.inject_fat_item(fat_relation)
end

#reset! ⇒ Object

Clear the source (this will force reloading of elements and discard unsaved changes



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# File 'lib/talia_core/active_source_parts/predicate_handler.rb', line 89

def reset!
  @type_cache = nil
end

#save_wrappers ⇒ Object

Go through the existing relation wrappers and save the (new) items



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# File 'lib/talia_core/active_source_parts/predicate_handler.rb', line 71

def save_wrappers
  each_cached_wrapper do |wrap|
    # Load unloaded if we're not rdf_autosaving. Quick hack since otherwise
    # since the blanking of unloaded properties could cause problems with
    # the rdf writing otherwise
    wrap.send(:load!) unless(wrap.loaded? || autosave_rdf?)
    wrap.save_items!
  end
end

#types ⇒ Object

Gets the types



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# File 'lib/talia_core/active_source_parts/predicate_handler.rb', line 41

def types
  get_objects_on(N::RDF.type.to_s)
end