Class: VRT::Mapping

Inherits:
Object
  • Object
show all
Defined in:
lib/vrt/mapping.rb

Instance Method Summary collapse

Constructor Details

#initialize(scheme) ⇒ Mapping

Returns a new instance of Mapping.



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# File 'lib/vrt/mapping.rb', line 3

def initialize(scheme)
  @scheme = scheme.to_s
  load_mappings
end

Instance Method Details

#get(id_list, version) ⇒ Object

returns the most specific value provided in the mapping file for the given vrt id

if no mapping file exists for the given version, the mapping file for the earliest version available will be used



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# File 'lib/vrt/mapping.rb', line 11

def get(id_list, version)
  # update the vrt id to the first version we have a mapping file for
  unless @mappings.key?(version)
    id_list = VRT.find_node(vrt_id: id_list.join('.'), preferred_version: @min_version).id_list
    version = @min_version
  end

  # iterate through the id components, keeping track of where we are in the mapping file
  # and the most specific mapped value found so far
  mapping = @mappings[version]['content']
  best_guess = @mappings[version]['metadata']['default']
  id_list.each do |id|
    entry = mapping[id]
    break unless entry # mapping file doesn't go this deep, return previous value
    best_guess = entry[@scheme] if entry[@scheme]
    # use the children mapping for the next iteration
    mapping = entry['children'] || {}
  end
  best_guess
end