Class: Remi::Transform

Inherits:
Object
  • Object
show all
Defined in:
lib/remi/transform.rb

Defined Under Namespace

Classes: Concatenate, Constant, DataFrameSieve, DateDiff, EnforceType, FormatDate, IfBlank, Lookup, Nvl, ParseDate, Partitioner, Postfix, Prefix, Replace, Truncate, Truthy, ValidateEmail

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args, source_metadata: {}, target_metadata: {}, **kargs, &block) ⇒ Transform

Public: Initializes the static arguments of a transform.

source_metadata - Metadata for the transform source. target_metadata - Metadata for the transform target.



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# File 'lib/remi/transform.rb', line 8

def initialize(*args, source_metadata: {}, target_metadata: {}, **kargs, &block)
  @source_metadata = source_metadata
  @target_metadata = target_metadata
  @multi_args = false
end

Instance Attribute Details

#multi_args ⇒ Object (readonly)

Public: Set to true if the transform expects multiple arguments (default: false)



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# File 'lib/remi/transform.rb', line 21

def multi_args
  @multi_args
end

#source_metadata ⇒ Object

Public: Accessor for source metadata



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# File 'lib/remi/transform.rb', line 15

def source_metadata
  @source_metadata
end

#target_metadata ⇒ Object

Public: Accessor for target metadata



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# File 'lib/remi/transform.rb', line 18

def target_metadata
  @target_metadata
end

Instance Method Details

#call(*args) ⇒ Object

Public: Allows one to call the proc defined by the transform so that Remi::Transform instances can be used interchangeably with normal lambdas.

values - The values to be transformed.

Returns the transformed value.



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# File 'lib/remi/transform.rb', line 38

def call(*args)
  if to_proc.arity == 0
    to_proc.call
  else
    to_proc.call(*args)
  end
end

#to_proc ⇒ Object

Public: Returns the transform as a lambda.



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# File 'lib/remi/transform.rb', line 47

def to_proc
  @to_proc ||= method(:transform).to_proc
end

#transform(value) ⇒ Object

Public: Defines the operation of this transform class.

value - The value to be transformed

Returns the transformed value.

Raises:

  • (NoMethodError) 


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# File 'lib/remi/transform.rb', line 28

def transform(value)
  raise NoMethodError, "#{__method__} not defined for #{self.class.name}"
end