File2Pipe: Class to obtain the source of an instance
In miferreiro/bdp4R: Big Data Preprocessing For R

The method of obtaining source is called which implement the subclasses of the superclass Instance.

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File2Pipe$new(propertyName = "source",
              alwaysBeforeDeps = list("TargetAssigningPipe"),
              notAfterDeps = list())

`propertyName`	(character) Name of the property associated with the pipe.
`alwaysBeforeDeps`	(list) The dependences alwaysBefore (pipes that must be executed before this one).
`notAfterDeps`	(list) The dependences notAfter (pipes that cannot be executed after this one).

An object of class R6ClassGenerator of length 24.

In the case that the source obtained is empty or is not utf-8, the instance is invalidated.

This class inherits from PipeGeneric and implements the pipe abstract function.

pipe Function that preprocesses the instance to obtain the source.
- Usage
  
  pipe(instance)
- Value
  
  The instance with the modifications that have occurred in the pipe.
- Arguments
  - instance (Instance) Instance to preproccess.