Amir Hadadi created TEXT-153:
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Summary: LookupTranslator performance optimization
Key: TEXT-153
URL: https://issues.apache.org/jira/browse/TEXT-153
Project: Commons Text
Issue Type: Improvement
Affects Versions: 1.0
Reporter: Amir Hadadi
When using Java Mission Control to profile an application that uses
StringEscapeUtils::escapeEcmaScript, I noticed that a lot of time is spent in
LookupTranslator::translate at the prefixSet::contains check.
I suggest taking advantage of the fact that prefixSet contains only characters,
and replace it with a BitSet.
I did some benchmarking and translate for the non escaped case is 4-5X faster
when replacing the HashSet with a BitSet.
BitSet Memory consumption for characters is capped at 8KB, and depends on the
maximal prefix character. For example for ECMA script the max escaped prefix
character is "\" which has unicode code 92 so the BitSet uses a long array of
length 2 to represent all the needed characters.
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