Class: LogStash::KeyNode

Inherits:
Object
  • Object
show all
Defined in:
lib/logstash/string_interpolation.rb

Instance Method Summary collapse

Constructor Details

#initialize(key) ⇒ KeyNode

Returns a new instance of KeyNode.



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# File 'lib/logstash/string_interpolation.rb', line 113

def initialize(key)
  @key = key
end

Instance Method Details

#evaluate(event) ⇒ Object 



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# File 'lib/logstash/string_interpolation.rb', line 117

def evaluate(event)
  value = event[@key]

  case value
  when nil
    "%{#{@key}}"
  when Array
    value.join(",")
  when Hash
    LogStash::Json.dump(value)
  when Numeric
    value
  when TrueClass
    value
  when FalseClass
    value
  else
    # If we dont know how to deal with the type we return a string
    # to make sure we don't return a reference.
    "#{value}"
  end
end