NormsProducer (Lucene 9.0.0 core API)

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

All Implemented Interfaces:

Closeable, AutoCloseable
```
public abstract class NormsProducer
extends Object
implements Closeable
```
Abstract API that produces field normalization values

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

Constructor Summary

Constructors
Modifier Constructor Description

protected NormsProducer()
Sole constructor.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract void`	`checkIntegrity()`	Checks consistency of this producer
`NormsProducer`	`getMergeInstance()`	Returns an instance optimized for merging.
`abstract NumericDocValues`	`getNorms(FieldInfo field)`	Returns `NumericDocValues` for this field.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.io.Closeable
close

- Constructor Detail
  - NormsProducer
```
protected NormsProducer()
```
    Sole constructor. (For invocation by subclass constructors, typically implicit.)
- Method Detail
  - getNorms
```
public abstract NumericDocValues getNorms(FieldInfo field)
                                   throws IOException
```
    Returns NumericDocValues for this field. The returned instance need not be thread-safe: it will only be used by a single thread.
    
    Throws:
    
    IOException
  - checkIntegrity
```
public abstract void checkIntegrity()
                             throws IOException
```
    Checks consistency of this producer
    Note that this may be costly in terms of I/O, e.g. may involve computing a checksum value against large data files.
    
    Throws:
    
    IOException
    
    NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.
  - getMergeInstance
```
public NormsProducer getMergeInstance()
```
    Returns an instance optimized for merging. This instance may only be used from the thread that acquires it.
    The default implementation returns this