Class: Bmg::Summarizer::Concat

Inherits:
Bmg::Summarizer show all
Defined in:
lib/bmg/summarizer/concat.rb

Overview

String concatenation summarizer.

Example:

# direct ruby usage
Bmg::Summarizer.concat(:qty).summarize(...)

Instance Attribute Summary

Attributes inherited from Bmg::Summarizer

#functor, #options

Instance Method Summary collapse

Methods inherited from Bmg::Summarizer

avg, by_proc, collect, concat, count, distinct, distinct_count, first, #happens, #initialize, last, max, median, median_cont, median_disc, min, multiple, percentile, percentile_cont, percentile_disc, stddev, sum, summarization, #summarize, #to_summarizer_name, value_by, variance

Constructor Details

This class inherits a constructor from Bmg::Summarizer

Instance Method Details

#_happens(memo, val) ⇒ Object

Concatenates current memo with val.to_s



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# File 'lib/bmg/summarizer/concat.rb', line 24

def _happens(memo, val) 
  memo << options[:between].to_s unless memo.empty?
  memo << val.to_s
end

#default_options ⇒ Object

Sets default options.



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# File 'lib/bmg/summarizer/concat.rb', line 14

def default_options
  {:before => "", :after => "", :between => ""}
end

#finalize(memo) ⇒ Object

Finalizes computation



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# File 'lib/bmg/summarizer/concat.rb', line 30

def finalize(memo)
  options[:before].to_s + memo + options[:after].to_s
end

#least ⇒ Object

Returns least value (defaults to “”)



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# File 'lib/bmg/summarizer/concat.rb', line 19

def least()
  ""
end