def lookup(key, scope, order_override, resolution_type)
answer = Backend.empty_answer(resolution_type)
Hiera.debug("Looking up #{key} in YAML backend")
Backend.datasources(scope, order_override) do |source|
Hiera.debug("Looking for data source #{source}")
yamlfile = Backend.datafile(:yaml, scope, source, "yaml") || next
data = YAML.load_file(yamlfile)
next if ! data
next if data.empty?
next unless data.include?(key)
new_answer = Backend.parse_answer(data[key], scope)
case resolution_type
when :array
raise Exception, "Hiera type mismatch: expected Array and got #{new_answer.class}" unless new_answer.kind_of? Array or new_answer.kind_of? String
answer << new_answer
when :hash
raise Exception, "Hiera type mismatch: expected Hash and got #{new_answer.class}" unless new_answer.kind_of? Hash
answer = new_answer.merge answer
else
answer = new_answer
break
end
end
return answer
end