org.apache.lucene.codecs.memory

## Class FSTTermsReader

- java.lang.Object
- - org.apache.lucene.index.Fields
  - - org.apache.lucene.codecs.FieldsProducer
    - - org.apache.lucene.codecs.memory.FSTTermsReader

- All Implemented Interfaces:
    Closeable, AutoCloseable, Iterable<String>, Accountable

      public class FSTTermsReader
      extends FieldsProducer

  FST-based terms dictionary reader. The FST directly maps each term and its metadata, it is memory resident.
  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Field Summary

    - ### Fields inherited from class org.apache.lucene.index.Fields

      `EMPTY_ARRAY`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FSTTermsReader(SegmentReadState state, PostingsReaderBase postingsReader)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `checkIntegrity()`
    `void` | `close()`
    `Collection<Accountable>` | `getChildResources()`
    `Iterator<String>` | `iterator()`
    `long` | `ramBytesUsed()`
    `int` | `size()`
    `Terms` | `terms(String field)`
    `String` | `toString()`

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

      `getMergeInstance`

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

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

    - ### Methods inherited from interface java.lang.Iterable

      `forEach, spliterator`

- - ### Constructor Detail

    - #### FSTTermsReader

          public FSTTermsReader(SegmentReadState state,
                                PostingsReaderBase postingsReader)
                         throws IOException

      Throws:
        `IOException`

  - ### Method Detail

    - #### iterator

          public Iterator<String> iterator()

      Specified by:
        `iterator` in interface `Iterable<String>`
      Specified by:
        `iterator` in class `Fields`

    - #### terms

          public Terms terms(String field)
                      throws IOException

      Specified by:
        `terms` in class `Fields`
      Throws:
        `IOException`

    - #### size

          public int size()

      Specified by:
        `size` in class `Fields`

    - #### close

          public void close()
                     throws IOException

      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Specified by:
        `close` in class `FieldsProducer`
      Throws:
        `IOException`

    - #### ramBytesUsed

          public long ramBytesUsed()

    - #### getChildResources

          public Collection<Accountable> getChildResources()

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### checkIntegrity

          public void checkIntegrity()
                              throws IOException

      Specified by:
        `checkIntegrity` in class `FieldsProducer`
      Throws:
        `IOException`

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