[jira] [Created] (LUCENE-4604) Implement LeavesOnlyOrdinalPolicy

["Shai Erera (JIRA)" <ji...@apache.org>]

Shai Erera created LUCENE-4604:
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             Summary: Implement LeavesOnlyOrdinalPolicy
                 Key: LUCENE-4604
                 URL: https://issues.apache.org/jira/browse/LUCENE-4604
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Shai Erera
            Assignee: Shai Erera
            Priority: Minor
             Fix For: 4.1, 5.0


Over at LUCENE-4602, Mike explored the idea of writing just the leaf nodes in the fulltree posting, rather than the full hierarchy. I wrote this simple OrdinalPolicy which achieves that:

{code}
DefaultFacetIndexingParams indexingParams = new DefaultFacetIndexingParams() {

  @Override
  protected OrdinalPolicy fixedOrdinalPolicy() {
    return new OrdinalPolicy() {
      public void init(TaxonomyWriter taxonomyWriter) {}
      public boolean shouldAdd(int ordinal) { return false; }
    };
  }
};
{code}

I think that we should add it as a singleton class to OrdinalPolicy.EXACT_CATEGORIES_ONLY, as wel as make DefaultOrdPolicy as singleton too, under the name FULL_HIERARCHY (feel free to suggest a better name).

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