org.apache.lucene.codecs.memory

## Class MemoryPostingsFormat

- java.lang.Object
- - org.apache.lucene.codecs.PostingsFormat
  - - org.apache.lucene.codecs.memory.MemoryPostingsFormat

- All Implemented Interfaces:
    NamedSPILoader.NamedSPI

      public final class MemoryPostingsFormat
      extends PostingsFormat

  Stores terms and postings (docs, positions, payloads) in RAM, using an FST.

  Note that this codec implements advance as a linear scan! This means if you store large fields in here, queries that rely on advance will (AND BooleanQuery, PhraseQuery) will be relatively slow!

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

- - ### Field Summary

    - ### Fields inherited from class org.apache.lucene.codecs.PostingsFormat

      `EMPTY`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MemoryPostingsFormat()`
    `MemoryPostingsFormat(boolean doPackFST, float acceptableOverheadRatio)` Create MemoryPostingsFormat, specifying advanced FST options.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `FieldsConsumer` | `fieldsConsumer(SegmentWriteState state)`
    `FieldsProducer` | `fieldsProducer(SegmentReadState state)`
    `String` | `toString()`

    - ### Methods inherited from class org.apache.lucene.codecs.PostingsFormat

      `availablePostingsFormats, forName, getName, reloadPostingsFormats`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### MemoryPostingsFormat

          public MemoryPostingsFormat()

    - #### MemoryPostingsFormat

          public MemoryPostingsFormat(boolean doPackFST,
                              float acceptableOverheadRatio)

      Create MemoryPostingsFormat, specifying advanced FST options.
      Parameters:
        `doPackFST` - true if a packed FST should be built. NOTE: packed FSTs are limited to ~2.1 GB of postings.
        `acceptableOverheadRatio` - allowable overhead for packed ints during FST construction.

  - ### Method Detail

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `PostingsFormat`

    - #### fieldsConsumer

          public FieldsConsumer fieldsConsumer(SegmentWriteState state)
                                        throws IOException

      Specified by:
        `fieldsConsumer` in class `PostingsFormat`
      Throws:
        `IOException`

    - #### fieldsProducer

          public FieldsProducer fieldsProducer(SegmentReadState state)
                                        throws IOException

      Specified by:
        `fieldsProducer` in class `PostingsFormat`
      Throws:
        `IOException`

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