## Uses of Class
org.apache.lucene.codecs.FieldsProducer

- Packages that use FieldsProducer
  Package | Description
  --- | ---
  org.apache.lucene.codecs | Codecs API: API for customization of the encoding and structure of the index.
  org.apache.lucene.codecs.lucene90.blocktree | BlockTree terms dictionary.
  org.apache.lucene.codecs.lucene99 | Lucene 9.9 file format.
  org.apache.lucene.codecs.perfield | Postings format that can delegate to different formats per-field.
  org.apache.lucene.index | Code to maintain and access indices.

- - ### Uses of FieldsProducer in org.apache.lucene.codecs

    Methods in org.apache.lucene.codecs that return FieldsProducer
    Modifier and Type | Method | Description
    --- | --- | ---
    `abstract FieldsProducer` | PostingsFormat.`fieldsProducer​(SegmentReadState state)` | Reads a segment.
    `FieldsProducer` | FieldsProducer.`getMergeInstance()` | Returns an instance optimized for merging.

  - ### Uses of FieldsProducer in org.apache.lucene.codecs.lucene90.blocktree

    Subclasses of FieldsProducer in org.apache.lucene.codecs.lucene90.blocktree
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `Lucene90BlockTreeTermsReader` | A block-based terms index and dictionary that assigns terms to variable length blocks according to how they share prefixes.

  - ### Uses of FieldsProducer in org.apache.lucene.codecs.lucene99

    Methods in org.apache.lucene.codecs.lucene99 that return FieldsProducer
    Modifier and Type | Method | Description
    --- | --- | ---
    `FieldsProducer` | Lucene99PostingsFormat.`fieldsProducer​(SegmentReadState state)` |

  - ### Uses of FieldsProducer in org.apache.lucene.codecs.perfield

    Methods in org.apache.lucene.codecs.perfield that return FieldsProducer
    Modifier and Type | Method | Description
    --- | --- | ---
    `FieldsProducer` | PerFieldPostingsFormat.`fieldsProducer​(SegmentReadState state)` |

  - ### Uses of FieldsProducer in org.apache.lucene.index

    Fields in org.apache.lucene.index declared as FieldsProducer
    Modifier and Type | Field | Description
    --- | --- | ---
    `FieldsProducer[]` | MergeState.`fieldsProducers` | Postings to merge

    Methods in org.apache.lucene.index that return FieldsProducer
    Modifier and Type | Method | Description
    --- | --- | ---
    `abstract FieldsProducer` | CodecReader.`getPostingsReader()` | Expert: retrieve underlying FieldsProducer
    `FieldsProducer` | FilterCodecReader.`getPostingsReader()` |
    `FieldsProducer` | SegmentReader.`getPostingsReader()` |
    `FieldsProducer` | SortingCodecReader.`getPostingsReader()` |