org.apache.lucene.codecs

## Class NormsFormat

- java.lang.Object
- - org.apache.lucene.codecs.NormsFormat

- Direct Known Subclasses:
    Lucene70NormsFormat

      public abstract class NormsFormat
      extends Object

  Encodes/decodes per-document score normalization values.

- - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `NormsFormat()` Sole constructor.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract NormsConsumer` | `normsConsumer(SegmentWriteState state)` Returns a `NormsConsumer` to write norms to the index.
    `abstract NormsProducer` | `normsProducer(SegmentReadState state)` Returns a `NormsProducer` to read norms from the index.

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

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

- - ### Constructor Detail

    - #### NormsFormat

          protected NormsFormat()

      Sole constructor. (For invocation by subclass constructors, typically implicit.)

  - ### Method Detail

    - #### normsConsumer

          public abstract NormsConsumer normsConsumer(SegmentWriteState state)
                                               throws IOException

      Returns a `NormsConsumer` to write norms to the index.
      Throws:
        `IOException`

    - #### normsProducer

          public abstract NormsProducer normsProducer(SegmentReadState state)
                                               throws IOException

      Returns a `NormsProducer` to read norms from the index.

      NOTE: by the time this call returns, it must hold open any files it will need to use; else, those files may be deleted. Additionally, required files may be deleted during the execution of this call before there is a chance to open them. Under these circumstances an IOException should be thrown by the implementation. IOExceptions are expected and will automatically cause a retry of the segment opening logic with the newly revised segments.

      Throws:
        `IOException`

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