class ArcFurnace::EnumeratorSource
Attributes
value[R]
Public Class Methods
new()
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# File lib/arc-furnace/enumerator_source.rb, line 9 def initialize @enumerator = build_enumerator preprocess advance end
Public Instance Methods
advance()
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# File lib/arc-furnace/enumerator_source.rb, line 26 def advance @value = begin enumerator.next if enumerator rescue StopIteration @enumerator = nil nil end end
empty?()
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Is this source empty?
# File lib/arc-furnace/enumerator_source.rb, line 22 def empty? !value end
preprocess()
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Called after setting up the enumerator but before advancing it Use this to extract header rows for instance.
# File lib/arc-furnace/enumerator_source.rb, line 17 def preprocess # nothing end
Protected Instance Methods
build_enumerator()
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Return the enumerator
# File lib/arc-furnace/enumerator_source.rb, line 39 def build_enumerator raise "Unimplemented" end