Method: MARCSpec::Map.fromFile

Defined in:
lib/marcspec/map.rb

.fromFile(filename) ⇒ Object

Load a map from a file, determining what kind it is along the way.

The file is valid ruby code; see the subclasses KVMap and MutlValueMap for examples.

Parameters:

  • filename (String) —

    The name of the map file to be eval'd

Returns:

  • MARC2Solr::Map An instance of a subclass of MARC2Solr::Map



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# File 'lib/marcspec/map.rb', line 36

def self.fromFile filename
  begin
    str = File.open(filename).read
  rescue Exception => e
     "Problem opening #{filename}: #{e}"
    raise e
  end
  
  begin 
    rawmap = eval(str)
  rescue Exception => e
    log.error "Problem evaluating (with 'eval') file #{filename}: #{e}"
    raise e
  end
  
  # Derive a name if there isn't one
  unless rawmap[:mapname]
    name = File.basename(filename)
    name.gsub! /\..*$/, '' # remove the extension
    rawmap[:mapname] = name
  end
  
  case rawmap[:maptype]
  when :kv
    return KVMap.new(rawmap[:mapname], rawmap[:map])
  when :multi
    return MultiValueMap.new(rawmap[:mapname], rawmap[:map])
  else
    log.error "Map file #{filename} doesn't seem to be either a KV map or a MuliValueMap according to :maptype (#{rawmap[:maptype]})"
    raise ArgumentError, "File #{filename} doesn't evaluate to a valid map"
  end
  
end