Class: Wukong::Processor::Null

Inherits:

Filter

• Object
• Hanuman::Stage
• Wukong::Processor
• Filter
• Wukong::Processor::Null

Defined in:

lib/wukong/widget/filters.rb

Overview

A widget which doesn't pass any records, i.e. - it acts just like /dev/null.

Examples:

Filter all records on the command line

$ cat input
1
2
3
$ cat input | wu-local null

Filter all records from a dataflow

Wukong.dataflow(:uses_null) do
  ... | null | ...
end

See Also:

• Filter
• All

Constant Summary

Constants inherited from Wukong::Processor

SerializerError

Instance Attribute Summary

Attributes included from Hanuman::StageInstanceMethods

#graph

Instance Method Summary

• #select?(record) ⇒ Boolean

  Prevents any records from passing because it always returns false.

Methods inherited from Filter

#process, #reject?

Methods inherited from Wukong::Processor

configure, description, #finalize, #perform_action, #process, #receive_action, #setup, #stop

Methods included from Logging

included

Methods inherited from Hanuman::Stage

#clone

Methods included from Hanuman::StageClassMethods

#builder, #label, #register, #set_builder

Methods included from Hanuman::StageInstanceMethods

#add_link, #linkable_name, #root

Instance Method Details

#select?(record) ⇒ Boolean

Prevents any records from passing because it always returns false.

Parameters:

• record (Object)

Returns:

• (Boolean) —

  false

# File 'lib/wukong/widget/filters.rb', line 100

def select? record
  false
end