60 lines
2.2 KiB
Ruby
60 lines
2.2 KiB
Ruby
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class CopyNamingAlgorithm
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DEFAULT_MAX_LENGTH = 255
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DEFAULT_MAX_COPIES = 255
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DEFAULT_SEPARATOR_BEFORE_COPY_NUMBER = "_"
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def copy_addition
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raise NotImplementedError
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end
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def separator_before_copy_number
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DEFAULT_SEPARATOR_BEFORE_COPY_NUMBER
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end
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def max_length
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DEFAULT_MAX_LENGTH
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end
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def max_copies
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DEFAULT_MAX_COPIES
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end
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def get_already_used_name_entities(base_name)
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raise NotImplementedError
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end
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def get_name_for_entity(name_entity)
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name_entity
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end
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def create_copy_name(name_to_copy)
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# remove copy addition and number
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base_name = name_to_copy.gsub(/#{Regexp.quote(self.copy_addition)}(#{Regexp.quote(separator_before_copy_number)}\d+)?\z/,'')
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name_entities_to_check_against = get_already_used_name_entities(base_name).collect{|entity| self.get_name_for_entity(entity)}.to_a
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(0..max_copies-1).each {|copy_num|
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name_to_test = generate_name(base_name, copy_num)
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if (name_entities_to_check_against.none? {|entity_name| entity_name == name_to_test})
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return name_to_test
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end
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}
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raise ArgumentError.new("It's not possible to generate a UNIQUE name using name_to_copy: #{name_to_copy} copy_addition: #{self.copy_addition} separator_before_copy_number: #{self.separator_before_copy_number} max_copy_num: #{self.max_copies} max_length: #{self.max_length}")
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end
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def generate_name(name_to_copy, copy_num)
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what_to_add = self.copy_addition + self.separator_before_copy_number + generate_copy_number(copy_num)
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# is what_to_add longer than max length? If so, it's not possible to create a copy
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if (what_to_add.length > self.max_length)
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raise ArgumentError.new("It's not possible to generate a name using name_to_copy: #{name_to_copy} copy_addition: #{self.copy_addition} separator_before_copy_number: #{self.separator_before_copy_number} copy_num: #{copy_num} max_length: #{self.max_length}")
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end
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max_length_for_name_to_copy = self.max_length - what_to_add.length
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name_to_copy[0..max_length_for_name_to_copy-1] + what_to_add
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end
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def generate_copy_number(unprefixed_copy_number)
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number_of_digits = Math.log10(self.max_copies).floor + 1
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"%0#{number_of_digits}d" % unprefixed_copy_number
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end
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end
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