FieldInfo (Lucene 8.9.0 API)乐学网一站式学习平台

java.lang.Object
- org.apache.lucene.index.FieldInfo

```
public final class FieldInfo
extends Object
```
Access to the Field Info file that describes document fields and whether or not they are indexed. Each segment has a separate Field Info file. Objects of this class are thread-safe for multiple readers, but only one thread can be adding documents at a time, with no other reader or writer threads accessing this object.

Field Summary

Fields
Modifier and Type Field and Description

String name
Field's name

int number
Internal field number

Fields
Modifier and Type	Field and Description
`String`	`name` Field's name
`int`	`number` Internal field number

Constructor Summary

Constructors
Constructor and Description
`FieldInfo(String name, int number, boolean storeTermVector, boolean omitNorms, boolean storePayloads, IndexOptions indexOptions, DocValuesType docValues, long dvGen, Map<String,String> attributes, int pointDimensionCount, int pointIndexDimensionCount, int pointNumBytes, boolean softDeletesField)` Sole constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Map<String,String>`	`attributes()` Returns internal codec attributes map.
`boolean`	`checkConsistency()` Performs internal consistency checks.
`String`	`getAttribute(String key)` Get a codec attribute value, or null if it does not exist
`long`	`getDocValuesGen()` Returns the docValues generation of this field, or -1 if no docValues updates exist for it.
`DocValuesType`	`getDocValuesType()` Returns `DocValuesType` of the docValues; this is `DocValuesType.NONE` if the field has no docvalues.
`IndexOptions`	`getIndexOptions()` Returns IndexOptions for the field, or IndexOptions.NONE if the field is not indexed
`int`	`getPointDimensionCount()` Return point data dimension count
`int`	`getPointIndexDimensionCount()` Return point data dimension count
`int`	`getPointNumBytes()` Return number of bytes per dimension
`boolean`	`hasNorms()` Returns true if this field actually has any norms.
`boolean`	`hasPayloads()` Returns true if any payloads exist for this field.
`boolean`	`hasVectors()` Returns true if any term vectors exist for this field.
`boolean`	`isSoftDeletesField()` Returns true if this field is configured and used as the soft-deletes field.
`boolean`	`omitsNorms()` Returns true if norms are explicitly omitted for this field
`String`	`putAttribute(String key, String value)` Puts a codec attribute value.
`void`	`setDocValuesType(DocValuesType type)` Record that this field is indexed with docvalues, with the specified type
`void`	`setIndexOptions(IndexOptions newIndexOptions)` Record the `IndexOptions` to use with this field.
`void`	`setOmitsNorms()` Omit norms for this field.
`void`	`setPointDimensions(int dimensionCount, int indexDimensionCount, int numBytes)` Record that this field is indexed with points, with the specified number of dimensions and bytes per dimension.

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

- Field Detail
  - name
```
public final String name
```
    Field's name
  - number
```
public final int number
```
    Internal field number
- Constructor Detail
  - FieldInfo
```
public FieldInfo(String name,
                 int number,
                 boolean storeTermVector,
                 boolean omitNorms,
                 boolean storePayloads,
                 IndexOptions indexOptions,
                 DocValuesType docValues,
                 long dvGen,
                 Map<String,String> attributes,
                 int pointDimensionCount,
                 int pointIndexDimensionCount,
                 int pointNumBytes,
                 boolean softDeletesField)
```
    Sole constructor.
    
    WARNING: This API is experimental and might change in incompatible ways in the next release.
- Method Detail
  - checkConsistency
```
public boolean checkConsistency()
```
    Performs internal consistency checks. Always returns true (or throws IllegalStateException)
  - setPointDimensions
```
public void setPointDimensions(int dimensionCount,
                               int indexDimensionCount,
                               int numBytes)
```
    Record that this field is indexed with points, with the specified number of dimensions and bytes per dimension.
  - getPointDimensionCount
```
public int getPointDimensionCount()
```
    Return point data dimension count
  - getPointIndexDimensionCount
```
public int getPointIndexDimensionCount()
```
    Return point data dimension count
  - getPointNumBytes
```
public int getPointNumBytes()
```
    Return number of bytes per dimension
  - setDocValuesType
```
public void setDocValuesType(DocValuesType type)
```
    Record that this field is indexed with docvalues, with the specified type
  - getIndexOptions
```
public IndexOptions getIndexOptions()
```
    Returns IndexOptions for the field, or IndexOptions.NONE if the field is not indexed
  - setIndexOptions
```
public void setIndexOptions(IndexOptions newIndexOptions)
```
    Record the IndexOptions to use with this field.
  - getDocValuesType
```
public DocValuesType getDocValuesType()
```
    Returns DocValuesType of the docValues; this is DocValuesType.NONE if the field has no docvalues.
  - getDocValuesGen
```
public long getDocValuesGen()
```
    Returns the docValues generation of this field, or -1 if no docValues updates exist for it.
  - omitsNorms
```
public boolean omitsNorms()
```
    Returns true if norms are explicitly omitted for this field
  - setOmitsNorms
```
public void setOmitsNorms()
```
    Omit norms for this field.
  - hasNorms
```
public boolean hasNorms()
```
    Returns true if this field actually has any norms.
  - hasPayloads
```
public boolean hasPayloads()
```
    Returns true if any payloads exist for this field.
  - hasVectors
```
public boolean hasVectors()
```
    Returns true if any term vectors exist for this field.
  - getAttribute
```
public String getAttribute(String key)
```
    Get a codec attribute value, or null if it does not exist
  - putAttribute
```
public String putAttribute(String key,
                           String value)
```
    Puts a codec attribute value.
    This is a key-value mapping for the field that the codec can use to store additional metadata, and will be available to the codec when reading the segment via getAttribute(String)
    If a value already exists for the key in the field, it will be replaced with the new value. If the value of the attributes for a same field is changed between the documents, the behaviour after merge is undefined.
  - attributes
```
public Map<String,String> attributes()
```
    Returns internal codec attributes map.
  - isSoftDeletesField
```
public boolean isSoftDeletesField()
```
    Returns true if this field is configured and used as the soft-deletes field. See LiveIndexWriterConfig.softDeletesField

Class FieldInfo

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

name

number

Constructor Detail

FieldInfo

Method Detail

checkConsistency

setPointDimensions

getPointDimensionCount

getPointIndexDimensionCount

getPointNumBytes

setDocValuesType

getIndexOptions

setIndexOptions

getDocValuesType

getDocValuesGen

omitsNorms

setOmitsNorms

hasNorms

hasPayloads

hasVectors

getAttribute

putAttribute

attributes

isSoftDeletesField