janhoy commented on a change in pull request #84:
URL: https://github.com/apache/lucene/pull/84#discussion_r613595880
##########
File path:
lucene/analysis/common/src/java/org/apache/lucene/analysis/miscellaneous/ScandinavianNormalizationFilter.java
##########
@@ -33,14 +34,45 @@
* <p>blåbærsyltetøj == blåbärsyltetöj == blaabaarsyltetoej but not
blabarsyltetoj räksmörgås ==
* ræksmørgås == ræksmörgaos == raeksmoergaas but not raksmorgas
*
+ * <p>You can choose which of the foldings to apply (aa, ao, ae, oe, oo)
through a parameter.
+ *
* @see ScandinavianFoldingFilter
*/
public final class ScandinavianNormalizationFilter extends TokenFilter {
+ /**
+ * Create the filter with default folding rules, backward compatible with
all earlier versions
+ *
+ * @param input the TokenStream
+ */
public ScandinavianNormalizationFilter(TokenStream input) {
super(input);
+ this.foldings = ALL_FOLDINGS;
}
+ /**
+ * Create the filter using custom folding rules.
+ *
+ * @param input the TokenStream
+ * @param foldings a Set of Foldings to apply (i.e. AE, OE, AA, AO, OO)
+ */
+ public ScandinavianNormalizationFilter(TokenStream input, Set<Foldings>
foldings) {
Review comment:
We can obtain a similar Lucene API usability by adding helper vars:
```java
public static final Set<Foldings> ALL_FOLDINGS = Set.of(AA, AO, OO, AE, OE);
public static final Set<Foldings> NORWEGIAN_FOLDINGS = Set.of(AE, OE, AA);
public static final Set<Foldings> DANISH_FOLDINGS = NORWEGIAN_FOLDINGS;
public static final Set<Foldings> SWEDISH_FOLDINGS = ALL_FOLDINGS;
```
In the factory that would translate to perhaps a "language" parameter with
predefined settings.
I'm not opposed to thin wrapper filters for each language, but I'd like some
feedback from other Scandinavian users on what those should default to.
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