MultiFields (Lucene 9.11.1 core API)

java.lang.Object
- org.apache.lucene.index.Fields
- - org.apache.lucene.index.MultiFields

All Implemented Interfaces:

Iterable<String>
```
public final class MultiFields
extends Fields
```
Provides a single Fields term index view over an IndexReader. This is useful when you're interacting with an IndexReader implementation that consists of sequential sub-readers (eg DirectoryReader or MultiReader) and you must treat it as a LeafReader.
NOTE: for composite readers, you'll get better performance by gathering the sub readers using IndexReader.getContext() to get the atomic leaves and then operate per-LeafReader, instead of using this class.

NOTE: This API is for internal purposes only 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 Description

MultiFields(Fields[] subs, ReaderSlice[] subSlices)
Sole constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Iterator<String>`	`iterator()`	Returns an iterator that will step through all fields names.
`int`	`size()`	Returns the number of fields or -1 if the number of distinct field names is unknown.
`Terms`	`terms(String field)`	Get the `Terms` 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.lang.Iterable
forEach, spliterator

- Constructor Detail
  - MultiFields
```
public MultiFields(Fields[] subs,
                   ReaderSlice[] subSlices)
```
    Sole constructor.
- Method Detail
  - iterator
```
public Iterator<String> iterator()
```
    Description copied from class: Fields
    
    Returns an iterator that will step through all fields names. This will not return null.
    
    Specified by:
    
    iterator in interface Iterable<String>
    
    Specified by:
    
    iterator in class Fields
  - terms
```
public Terms terms(String field)
            throws IOException
```
    Description copied from class: Fields
    
    Get the Terms for this field. This will return null if the field does not exist.
    
    Specified by:
    
    terms in class Fields
    
    Throws:
    
    IOException
  - size
```
public int size()
```
    Description copied from class: Fields
    
    Returns the number of fields or -1 if the number of distinct field names is unknown. If >= 0, Fields.iterator() will return as many field names.
    
    Specified by:
    
    size in class Fields