Class: Valkyrie::Persistence::Fedora::Persister::OrmConverter::GraphToAttributes::Applicator

Inherits:
Object
  • Object
show all
Defined in:
lib/valkyrie/persistence/fedora/persister/orm_converter.rb

Overview

Class for mapping RDF statements in Property objects to Valkyrie Resource attributes

Direct Known Subclasses

NonStringSingleApplicator, SingleApplicator

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(property) ⇒ Applicator

Returns a new instance of Applicator.

Parameters:



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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 514

def initialize(property)
  @property = property
end

Instance Attribute Details

#property ⇒ Object (readonly)

Returns the value of attribute property.



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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 509

def property
  @property
end

Instance Method Details

#apply_to(hsh) ⇒ Hash

Apply as a single value by default, if there are multiple then create an array. Done to support single values - if the resource is a Set or Array then it’ll cast the single value back to an array appropriately.

Parameters:

  • hsh (Hash) —

    a new or existing Hash of attribute for Valkyrie resource attributes

Returns:

  • (Hash) 


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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 524

def apply_to(hsh)
  return if blacklist?(key)
  hsh[key.to_sym] = if hsh.key?(key.to_sym)
                      Array.wrap(hsh[key.to_sym]) + cast_array(values)
                    else
                      values
                    end
end

#blacklist ⇒ Array<String>

Retrieve a list of blacklisted URIs for predicates

Returns:

  • (Array<String>) 


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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 568

def blacklist
  [
    "http://fedora.info/definitions",
    "http://www.iana.org/assignments/relation/last"
  ]
end

#blacklist?(key) ⇒ Boolean

Determines whether or not a key is blacklisted for mapping (For example <fedora.info/definitions> assertions are not mapped to Valkyrie attributes)

Parameters:

  • key (Symbol)

Returns:

  • (Boolean) 


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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 548

def blacklist?(key)
  blacklist.each do |blacklist_item|
    return true if key.start_with?(blacklist_item)
  end
  false
end

#cast_array(values) ⇒ Array<Object>

Casts values into an Array

Parameters:

  • values (Object)

Returns:

  • (Array<Object>) 


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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 558

def cast_array(values)
  if values.is_a?(Time)
    [values]
  else
    Array(values)
  end
end

#key ⇒ Symbol

Derive the key for the Valkyrie resource attribute from the RDF statement in the Property

Returns:

  • (Symbol) 


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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 535

def key
  predicate = statement.predicate.to_s
  key = schema.property_for(resource: nil, predicate: predicate)
  namespaces.each do |namespace|
    key = key.to_s.gsub(/^#{namespace}/, '')
  end
  key
end

#namespaces ⇒ Array<String>

Retrieve a list of namespace URIs for predicates

Returns:

  • (Array<String>) 


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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 577

def namespaces
  [
    "http://www.fedora.info/definitions/v4/",
    "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  ]
end

#values ⇒ RDF::URI

Access the object for the RDF statement

Returns:



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# File 'lib/valkyrie/persistence/fedora/persister/orm_converter.rb', line 586

def values
  statement.object
end