romseygeek commented on a change in pull request #1467:
URL: https://github.com/apache/lucene-solr/pull/1467#discussion_r417400710
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File path: lucene/core/src/java/org/apache/lucene/search/FuzzyTermsEnum.java
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@@ -364,4 +325,60 @@ public BytesRef term() throws IOException {
}
}
+ /**
+ * Used for sharing automata between segments
+ *
+ * Levenshtein automata are large and expensive to build; we don't want to
build
+ * them directly on the query because this can blow up caches that use
queries
+ * as keys; we also don't want to rebuild them for every segment. This
attribute
+ * allows the FuzzyTermsEnum to build the automata once for its first segment
+ * and then share them for subsequent segment calls.
+ */
+ private interface AutomatonAttribute extends Attribute {
+ CompiledAutomaton[] getAutomata();
+ int getTermLength();
+ void init(Supplier<FuzzyAutomatonBuilder> builder);
+ }
+
+ private static class AutomatonAttributeImpl extends AttributeImpl implements
AutomatonAttribute {
+
+ private CompiledAutomaton[] automata;
+ private int termLength;
+
+ @Override
+ public CompiledAutomaton[] getAutomata() {
+ return automata;
+ }
+
+ @Override
+ public int getTermLength() {
+ return termLength;
+ }
+
+ @Override
+ public void init(Supplier<FuzzyAutomatonBuilder> supplier) {
+ if (automata != null) {
+ return;
+ }
+ FuzzyAutomatonBuilder builder = supplier.get();
+ this.termLength = builder.getTermLength();
+ this.automata = builder.buildAutomatonSet();
+ }
+
+ @Override
+ public void clear() {
+ this.automata = null;
+ }
+
+ @Override
+ public void reflectWith(AttributeReflector reflector) {
Review comment:
It's a private implementation and only gets used internally to
FuzzyTermsEnum, so I don't see how the analysis page or luke would get
presented with one of these?
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