[LUCENE-4604] Implement OrdinalPolicy.NO_PARENTS

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.1, 6.0
• Component/s: modules/facet
• Lucene Fields: New, Patch Available
• Assignee: Shai Erera
• Reporter: Shai Erera
• Created: 10/Dec/12 05:12
• Updated: 28/Aug/22 13:33
• Resolved: 10/Dec/12 15:32

Description

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:

DefaultFacetIndexingParams indexingParams = new DefaultFacetIndexingParams() {

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

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).