Class: ETL::Transform::DecodeTransform

Inherits:

Transform

• Object
• Transform
• ETL::Transform::DecodeTransform

show all

Defined in:

lib/etl/transform/decode_transform.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) decode_table_delimiter

  Returns the value of attribute decode_table_delimiter.

• - (Object) decode_table_path

  Returns the value of attribute decode_table_path.

• - (Object) default_value

  Returns the value of attribute default_value.

Attributes inherited from Transform

#configuration, #control, #name

Instance Method Summary (collapse)

• - (Object) decode_table

  Get the decode table.

• - (DecodeTransform) initialize(control, name, configuration = {}) constructor

  Initialize the transformer.

• - (Object) transform(name, value, row)

  Transform the value.

Methods inherited from Transform

benchmarks, transform

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# File 'lib/etl/transform/decode_transform.rb', line 17

def initialize(control, name, configuration={})
  super
  
  if configuration[:decode_table_path]
    configuration[:decode_table_path] = File.join(File.dirname(control.file), configuration[:decode_table_path])
  end
  
  @decode_table_path = (configuration[:decode_table_path] || 'decode.txt')
  @decode_table_delimiter = (configuration[:decode_table_delimiter] || ':')
  @default_value = (configuration[:default_value] || 'No Value')
end

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# File 'lib/etl/transform/decode_transform.rb', line 7

def decode_table_delimiter
  @decode_table_delimiter
end

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# File 'lib/etl/transform/decode_transform.rb', line 5

def decode_table_path
  @decode_table_path
end

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# File 'lib/etl/transform/decode_transform.rb', line 9

def default_value
  @default_value
end

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# File 'lib/etl/transform/decode_transform.rb', line 35

def decode_table
  unless @decode_table
    @decode_table = {}
    open(decode_table_path).each do |line|
      code, value = line.strip.split(decode_table_delimiter)
      if code && code.length > 0
        @decode_table[code] = value
      else
        @default_value = value
      end
    end
  end
  @decode_table
end

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# File 'lib/etl/transform/decode_transform.rb', line 30

def transform(name, value, row)
  decode_table[value] || default_value
end