Class: MDQuery::Dataset::Measure

Inherits:
Object
  • Object
show all
Defined in:
lib/mdquery/dataset.rb

Overview

describes a Measure computed from the source data over the Dimensions

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, dataset) ⇒ Measure

Returns a new instance of Measure.



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# File 'lib/mdquery/dataset.rb', line 196

def initialize(model, dataset)
  @dataset = dataset
  @key = model.key
  @definition = model.definition
  validate
end

Instance Attribute Details

#dataset ⇒ Object (readonly)

the dataset this Measure belongs to



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# File 'lib/mdquery/dataset.rb', line 188

def dataset
  @dataset
end

#definition ⇒ Object (readonly)

the SQL fragment definition of the Measure



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# File 'lib/mdquery/dataset.rb', line 194

def definition
  @definition
end

#key ⇒ Object (readonly)

the key identifying this Measure



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# File 'lib/mdquery/dataset.rb', line 191

def key
  @key
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/mdquery/dataset.rb', line 209

def inspect
  "#<Measure: key=#{key.inspect}, definition=#{definition.inspect}>"
end

#validate ⇒ Object 



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# File 'lib/mdquery/dataset.rb', line 203

def validate
  raise "no dataset" if !dataset
  raise "no key!" if !key
  raise "no definition!" if !definition || definition=~/^\s*$/
end