houdini/lib/copy_naming_algorithm.rb

60 lines
2.2 KiB
Ruby
Raw Normal View History

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