Improve automaton's MinimizeOperations.minimizeHopcroft() to not create so many
objects
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Key: LUCENE-2716
URL: https://issues.apache.org/jira/browse/LUCENE-2716
Project: Lucene - Java
Issue Type: Improvement
Affects Versions: 4.0
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Priority: Minor
Fix For: 4.0
MinimizeOperations.minimizeHopcroft() creates a lot of objects because of
strange arrays and useless ArrayLists with fixed length. E.g. it created
List<List<List<>>>. This patch minimizes this and makes the whole method much
more GC friendler by using simple arrays or avoiding empty LinkedLists at all
(inside reverse array).
minimize() is called very very often, especially in tests (MockAnalyzer).
A test for the method is prepared by Robert, we found a bug somewhere else in
automaton, so this is pending until his issue and fix arrives.
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