Class Lucene46FieldInfosFormat
Lucene 4.6 Field Infos format.
Field names are stored in the field info file, with suffix .fnm
.
FieldInfos (.fnm) --> Header,FieldsCount, <FieldName,FieldNumber, FieldBits,DocValuesBits,DocValuesGen,Attributes> FieldsCount,Footer
Data types:
- Header --> CodecHeader (Write
Header(Data )Output, String, Int32) - FieldsCount --> VInt (Write
VInt32(Int32) ) - FieldName --> String (Write
String(String) ) - FieldBits, DocValuesBits --> Byte (Write
Byte(Byte) ) - FieldNumber --> VInt (Write
Int32(Int32) ) - Attributes --> IDictionary<String,String> (WriteStringStringMap(IDictionary<String, String>))
- DocValuesGen --> Int64 (Write
Int64(Int64) ) - Footer --> CodecFooter (Write
Footer(Index )Output)
- FieldsCount: the number of fields in this file.
- FieldName: name of the field as a UTF-8 string.
- FieldNumber: the field's number. Note that unlike previous versions of Lucene, the fields are not numbered implicitly by their order in the file, instead explicitly.
- FieldBits: a System.
Byte containing field options.- The low-order bit is one for indexed fields, and zero for non-indexed fields.
- The second lowest-order bit is one for fields that have term vectors stored, and zero for fields without term vectors.
- If the third lowest order-bit is set (0x4), offsets are stored into the postings list in addition to positions.
- Fourth bit is unused.
- If the fifth lowest-order bit is set (0x10), norms are omitted for the indexed field.
- If the sixth lowest-order bit is set (0x20), payloads are stored for the indexed field.
- If the seventh lowest-order bit is set (0x40), term frequencies and positions omitted for the indexed field.
- If the eighth lowest-order bit is set (0x80), positions are omitted for the indexed field.
- DocValuesBits: a System.
Byte containing per-document value types. The type recorded as two four-bit integers, with the high-order bits representingnorms
options, and the low-order bits representing DocValues options. Each four-bit integer can be decoded as such:- 0: no DocValues for this field.
- 1: Numeric
Doc . (NUMERIC)Values - 2: Binary
Doc . (BINARY)Values - 3: Sorted
Doc . (SORTED)Values
- DocValuesGen is the generation count of the field's Doc
Values . If this is -1, there are no DocValues updates to that field. Anything above zero means there are updates stored by DocValues .Format - Attributes: a key-value map of codec-private attributes.
Note
This API is experimental and might change in incompatible ways in the next release.
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Codecs.Lucene46
Assembly: Lucene.Net.dll
Syntax
public sealed class Lucene46FieldInfosFormat : FieldInfosFormat
Constructors
| Improve this Doc View SourceLucene46FieldInfosFormat()
Sole constructor.
Declaration
public Lucene46FieldInfosFormat()
Properties
| Improve this Doc View SourceFieldInfosReader
Declaration
public override FieldInfosReader FieldInfosReader { get; }
Property Value
Type | Description |
---|---|
Field |
Overrides
| Improve this Doc View SourceFieldInfosWriter
Declaration
public override FieldInfosWriter FieldInfosWriter { get; }
Property Value
Type | Description |
---|---|
Field |