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## org.apache.lucene.facet.util
Class FacetsPayloadMigrationReader

    java.lang.Object
      org.apache.lucene.index.IndexReader
          org.apache.lucene.index.AtomicReader
              org.apache.lucene.index.FilterAtomicReader
                  org.apache.lucene.facet.util.FacetsPayloadMigrationReader

All Implemented Interfaces:
  Closeable

    public class FacetsPayloadMigrationReader

extends FilterAtomicReader

A `FilterAtomicReader` for migrating a facets index which encodes category ordinals in a payload to `BinaryDocValues`. To migrate the index, you should build a mapping from a field (String) to term (`Term`), which denotes under which BinaryDocValues field to put the data encoded in the matching term's payload. You can follow the code example below to migrate an existing index:

     // Add the index and migrate payload to DocValues on the go
     DirectoryReader reader = DirectoryReader.open(oldDir);
     IndexWriterConfig conf = new IndexWriterConfig(VER, ANALYZER);
     IndexWriter writer = new IndexWriter(newDir, conf);
     List<AtomicReaderContext> leaves = reader.leaves();
     AtomicReader wrappedLeaves[] = new AtomicReader[leaves.size()];
     for (int i = 0; i < leaves.size(); i++) {
       wrappedLeaves[i] = new FacetPayloadMigrationReader(leaves.get(i).reader(),
           fieldTerms);
     }
     writer.addIndexes(new MultiReader(wrappedLeaves));
     writer.commit();

NOTE: to build the field-to-term map you can use `buildFieldTermsMap(Directory, FacetIndexingParams)`, as long as the index to migrate contains the ordinals payload under `PAYLOAD_TERM_TEXT`.

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

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.index.FilterAtomicReader
`FilterAtomicReader.FilterDocsAndPositionsEnum, FilterAtomicReader.FilterDocsEnum, FilterAtomicReader.FilterFields, FilterAtomicReader.FilterTerms, FilterAtomicReader.FilterTermsEnum`

Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader
`IndexReader.ReaderClosedListener`

Field Summary
`static String` | `PAYLOAD_TERM_TEXT` The `Term` text of the ordinals payload.

Fields inherited from class org.apache.lucene.index.FilterAtomicReader
`in`

Constructor Summary
`FacetsPayloadMigrationReader(AtomicReader in, Map<String,Term> fieldTerms)` Wraps an `AtomicReader` and migrates the payload to `BinaryDocValues` fields by using the given mapping.

Method Summary
`static Map<String,Term>` | `buildFieldTermsMap(Directory dir, FacetIndexingParams fip)` A utility method for building the field-to-Term map, given the `FacetIndexingParams` and the directory of the index to migrate.
`BinaryDocValues` | `getBinaryDocValues(String field)`
`FieldInfos` | `getFieldInfos()`

Methods inherited from class org.apache.lucene.index.FilterAtomicReader
`doClose, document, fields, getLiveDocs, getNormValues, getNumericDocValues, getSortedDocValues, getSortedSetDocValues, getTermVectors, maxDoc, numDocs, toString`

Methods inherited from class org.apache.lucene.index.AtomicReader
`docFreq, getContext, getDocCount, getSumDocFreq, getSumTotalTermFreq, hasNorms, termDocsEnum, termPositionsEnum, terms, totalTermFreq`

Methods inherited from class org.apache.lucene.index.IndexReader
`addReaderClosedListener, close, decRef, document, document, ensureOpen, equals, getCombinedCoreAndDeletesKey, getCoreCacheKey, getRefCount, getTermVector, hasDeletions, hashCode, incRef, leaves, numDeletedDocs, open, open, open, open, open, registerParentReader, removeReaderClosedListener, tryIncRef`

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

Field Detail

### PAYLOAD_TERM_TEXT

    public static final String PAYLOAD_TERM_TEXT

  The `Term` text of the ordinals payload.

  See Also:
    Constant Field Values

Constructor Detail

### FacetsPayloadMigrationReader

    public FacetsPayloadMigrationReader(AtomicReader in,
                                        Map<String,Term> fieldTerms)

  Wraps an `AtomicReader` and migrates the payload to `BinaryDocValues` fields by using the given mapping.

Method Detail

### buildFieldTermsMap

    public static Map<String,Term> buildFieldTermsMap(Directory dir,
                                                      FacetIndexingParams fip)
                                               throws IOException

  A utility method for building the field-to-Term map, given the `FacetIndexingParams` and the directory of the index to migrate. The map that will be built will correspond to partitions as well as multiple `CategoryListParams`.

  NOTE: since `CategoryListParams` no longer define a `Term`, this method assumes that the term used by the different `CategoryListParams` is `PAYLOAD_TERM_TEXT`. If this is not the case, then you should build the map yourself, using the terms in your index.

  Throws:
    `IOException`

### getBinaryDocValues

    public BinaryDocValues getBinaryDocValues(String field)
                                       throws IOException

  Overrides:
    `getBinaryDocValues` in class `FilterAtomicReader`
  Throws:
    `IOException`

### getFieldInfos

    public FieldInfos getFieldInfos()

  Overrides:
    `getFieldInfos` in class `FilterAtomicReader`

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