Class: ETL::Processor::EscapeCsvProcessor

Inherits:
Processor show all
Defined in:
lib/etl/processor/escape_csv_processor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(control, configuration) ⇒ EscapeCsvProcessor

Initialize the processor.

Configuration options:

  • :source_file: The file to load data from

  • :target_file: The file to write data to

  • :file: short-cut which will set the same value to both source_file and target_file

Raises:



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# File 'lib/etl/processor/escape_csv_processor.rb', line 23

def initialize(control, configuration)
  super
  if configuration[:file]
    @use_temp_file = true
    configuration[:source_file] = configuration[:file]
    configuration[:target_file] = configuration[:file] + '.tmp'
  end
  path = Pathname.new(configuration[:source_file])
  @source_file = path.absolute? ? path : Pathname.new(File.dirname(File.expand_path(configuration[:source_file]))) + path
  path = Pathname.new(configuration[:target_file])
  @target_file = path.absolute? ? path : Pathname.new(File.dirname(File.expand_path(configuration[:target_file]))) + path
  @filters = configuration[:filters] || [{:replace => '\"', :result => '""'}]
  @charcount = configuration[:charcount]
  raise ControlError, "Source file must be specified" if @source_file.nil?
  raise ControlError, "Target file must be specified" if @target_file.nil?
  raise ControlError, "Source and target file cannot currently point to the same file" if @source_file == @target_file
end

Instance Attribute Details

#charcountObject (readonly)

Returns the value of attribute charcount



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# File 'lib/etl/processor/escape_csv_processor.rb', line 15

def charcount
  @charcount
end

#filtersObject (readonly)

Returns the value of attribute filters



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# File 'lib/etl/processor/escape_csv_processor.rb', line 14

def filters
  @filters
end

#source_fileObject (readonly)

The file to load from



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# File 'lib/etl/processor/escape_csv_processor.rb', line 8

def source_file
  @source_file
end

#target_fileObject (readonly)

The file to write to



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# File 'lib/etl/processor/escape_csv_processor.rb', line 10

def target_file
  @target_file
end

#use_temp_fileObject (readonly)

whether to use a temporary file or not



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# File 'lib/etl/processor/escape_csv_processor.rb', line 12

def use_temp_file
  @use_temp_file
end

Instance Method Details

#processObject

Execute the processor



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# File 'lib/etl/processor/escape_csv_processor.rb', line 42

def process
  reader = File.open(@source_file, 'r')
  writer = File.open(@target_file, 'w')

  reader.each_line do |line|
    reading = line
    @filters.each do |filter|
      if (!filter[:replace].nil? &&
          !filter[:result].nil?)
        result = reading.gsub(Regexp.new(filter[:replace]), filter[:result])
        reading = result
      end
    end unless @filters.nil?
    @charcount.each do |count|
      if (!count[:char].nil? &&
          !count[:count].nil?)
        c = reading.count count[:char]
        if c != count[:count]
          reading = nil
        end
      end
    end unless @charcount.nil?
    writer.write(reading) unless reading.nil?
  end

  reader.close
  writer.close

  if use_temp_file
    FileUtils.rm(source_file)
    FileUtils.mv(target_file,source_file)
  end
end