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## org.apache.lucene.facet.index
Class FacetsPayloadProcessorProvider

    java.lang.Object
      org.apache.lucene.index.PayloadProcessorProvider
          org.apache.lucene.facet.index.FacetsPayloadProcessorProvider

    public class FacetsPayloadProcessorProvider

extends org.apache.lucene.index.PayloadProcessorProvider

A `PayloadProcessorProvider` for updating facets ordinal references, based on an ordinal map. You should use this code in conjunction with merging taxonomies - after you merge taxonomies, you receive an `DirectoryTaxonomyWriter.OrdinalMap` which maps the 'old' payloads to the 'new' ones. You can use that map to re-map the payloads which contain the facets information (ordinals) either before or while merging the indexes.

For re-mapping the ordinals before you merge the indexes, do the following:

     // merge the old taxonomy with the new one.
     OrdinalMap map = LuceneTaxonomyWriter.addTaxonomies();
     int[] ordmap = map.getMap();

     // re-map the ordinals on the old directory.
     Directory oldDir;
     FacetsPayloadProcessorProvider fppp = new FacetsPayloadProcessorProvider(
         oldDir, ordmap);
     IndexWriterConfig conf = new IndexWriterConfig(VER, ANALYZER);
     conf.setMergePolicy(new ForceOptimizeMergePolicy());
     IndexWriter writer = new IndexWriter(oldDir, conf);
     writer.setPayloadProcessorProvider(fppp);
     writer.forceMerge(1);
     writer.close();

     // merge that directory with the new index.
     IndexWriter newWriter; // opened on the 'new' Directory
     newWriter.addIndexes(oldDir);
     newWriter.commit();

For re-mapping the ordinals during index merge, do the following:

     // merge the old taxonomy with the new one.
     OrdinalMap map = LuceneTaxonomyWriter.addTaxonomies();
     int[] ordmap = map.getMap();

     // Add the index and re-map ordinals on the go
     IndexReader r = IndexReader.open(oldDir);
     IndexWriterConfig conf = new IndexWriterConfig(VER, ANALYZER);
     IndexWriter writer = new IndexWriter(newDir, conf);
     writer.setPayloadProcessorProvider(fppp);
     writer.addIndexes(r);
     writer.commit();

NOTE: while the second example looks simpler, IndexWriter may trigger a long merge due to addIndexes. The first example avoids this perhaps unneeded merge, as well as can be done separately (e.g. on another node) before the index is merged.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary
`static class` | `FacetsPayloadProcessorProvider.FacetsDirPayloadProcessor`
`static class` | `FacetsPayloadProcessorProvider.FacetsPayloadProcessor` A PayloadProcessor for updating facets ordinal references, based on an ordinal map

Nested classes/interfaces inherited from class org.apache.lucene.index.PayloadProcessorProvider
`org.apache.lucene.index.PayloadProcessorProvider.DirPayloadProcessor, org.apache.lucene.index.PayloadProcessorProvider.PayloadProcessor, org.apache.lucene.index.PayloadProcessorProvider.ReaderPayloadProcessor`

Constructor Summary
`FacetsPayloadProcessorProvider(org.apache.lucene.store.Directory dir, int[] ordinalMap, FacetIndexingParams indexingParams)` Construct FacetsPayloadProcessorProvider with FacetIndexingParams

Method Summary
`org.apache.lucene.index.PayloadProcessorProvider.ReaderPayloadProcessor` | `getReaderProcessor(org.apache.lucene.index.IndexReader reader)`

Methods inherited from class org.apache.lucene.index.PayloadProcessorProvider
`getDirProcessor`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### FacetsPayloadProcessorProvider

    public FacetsPayloadProcessorProvider(org.apache.lucene.store.Directory dir,
                                          int[] ordinalMap,
                                          FacetIndexingParams indexingParams)

  Construct FacetsPayloadProcessorProvider with FacetIndexingParams

  Parameters:
    `dir` - the `Directory` containing the segments to update
    `ordinalMap` - an array mapping previous facets ordinals to new ones
    `indexingParams` - the facets indexing parameters

Method Detail

### getReaderProcessor

    public org.apache.lucene.index.PayloadProcessorProvider.ReaderPayloadProcessor getReaderProcessor(org.apache.lucene.index.IndexReader reader)
                                                                                               throws IOException

  Overrides:
    `getReaderProcessor` in class `org.apache.lucene.index.PayloadProcessorProvider`
  Throws:
    `IOException`

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