Class: LogStash::Filters::MathCalculationElements::FieldElement

Inherits:
Object
  • Object
show all
Includes:
Util::Loggable
Defined in:
lib/logstash/filters/math_calculation_elements.rb

Instance Method Summary collapse

Constructor Details

#initialize(field, position) ⇒ FieldElement

supports ‘get` and `set`



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# File 'lib/logstash/filters/math_calculation_elements.rb', line 68

def initialize(field, position)
  @field = field
  @position = position
  @description = (position == 3 ? "result" : "operand #{@position}").prepend("event ").concat(": '#{@field}'")
end

Instance Method Details

#get(event_register_context) ⇒ Object 



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# File 'lib/logstash/filters/math_calculation_elements.rb', line 86

def get(event_register_context)
  value = event_register_context.get(self)
  if value.nil?
    logger.warn("field not found", "field" => @field, "event" => event_register_context.event.to_hash)
    return nil
  end
  case value
  when Numeric
    value
  when LogStash::Timestamp, Time
    value.to_f
  else
    logger.warn("field value is not numeric or time", "field" => @field, "value" => value, "event" => event_register_context.event.to_hash)
    nil
  end
end

#inspect ⇒ Object 



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# File 'lib/logstash/filters/math_calculation_elements.rb', line 103

def inspect
  "\"#{@description}\""
end

#key ⇒ Object 



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# File 'lib/logstash/filters/math_calculation_elements.rb', line 74

def key
  @field
end

#literal? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/filters/math_calculation_elements.rb', line 78

def literal?
  false
end

#set(value, event_register_context) ⇒ Object 



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# File 'lib/logstash/filters/math_calculation_elements.rb', line 82

def set(value, event_register_context)
  event_register_context.set(self, value)
end

#to_s ⇒ Object 



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# File 'lib/logstash/filters/math_calculation_elements.rb', line 107

def to_s
  @description
end