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# Service to determine which language to use for sorting and filtering.
module Qa
module LinkedData
class LanguageService
WILDCARD = '*'.freeze
class << self
# @param user_langauge [Symbol|String] the language code (e.g. :en, :fr) specified as URL parameter or on URL header
# @param authority_language [Symbol|String|Array<Symbol|String>] the default language specified in the authority's configuration file
# @return [Array<Symbol>] the selected language(s) normalized as an array of symbols (e.g. [:en, :fr])
# @note Precedence from high to low:
# * user_language (with URL parameter preferred over URL header)
# * authority_language (defined in authority config)
# * site default_language (defined in QA initializer)
def preferred_language(user_language: nil, authority_language: nil)
return normalize_language(user_language) if user_language.present?
return normalize_language(authority_language) if authority_language.present?
normalize_language(Qa.config.default_language)
end
# @param [RDF::Literal] the literal to check
# @return [Boolean] true if literal has a language tag; otherwise, false
def literal_has_language_marker?(literal)
return false unless literal.respond_to?(:language)
literal.language.present?
end
private
# Normalize language
# @param [String | Symbol | Array] language for filtering graph (e.g. "en" OR :en OR ["en", "fr"] OR [:en, :fr])
# @return [Array<Symbol>] an array of languages encoded as symbols (e.g. [:en] OR [:en, :fr])
def normalize_language(language)
return language if language.blank?
language = [language] unless language.is_a? Array
return nil if language.include?(WILDCARD)
language.map(&:to_sym)
end
end
end
end
end
Version data entries
27 entries across 27 versions & 1 rubygems