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Reset
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Resets this stream to the beginning. This is an optional operation, so
subclasses may or may not implement this method. Reset is not needed for
the standard indexing process. However, if the tokens of a
TokenStream are intended to be consumed more than once, it is
necessary to implement Reset. Note that if your TokenStream
caches tokens and feeds them back again after a reset, it is imperative
that you clone the tokens when you store them away (on the first pass) as
well as when you return them (on future passes after Reset).
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Overload List