NormsFormat (Lucene 9.2.0 core API)

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

Direct Known Subclasses:

Lucene90NormsFormat
```
public abstract class NormsFormat
extends Object
```
Encodes/decodes per-document score normalization values.

Constructor Summary

Constructors
Modifier Constructor Description

protected NormsFormat()
Sole constructor.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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