Interface ITermToBytesRefAttribute

This attribute is requested by TermsHashPerField to index the contents. This attribute can be used to customize the final byte[] encoding of terms.

Consumers of this attribute call BytesRef up-front, and then invoke FillBytesRef() for each term. Example:

  TermToBytesRefAttribute termAtt = tokenStream.GetAttribute<TermToBytesRefAttribute>;
  BytesRef bytes = termAtt.BytesRef;

  while (tokenStream.IncrementToken()
  {
    // you must call termAtt.FillBytesRef() before doing something with the bytes.
    // this encodes the term value (internally it might be a char[], etc) into the bytes.
    int hashCode = termAtt.FillBytesRef();

    if (IsInteresting(bytes))
    {
      // because the bytes are reused by the attribute (like CharTermAttribute's char[] buffer),
      // you should make a copy if you need persistent access to the bytes, otherwise they will
      // be rewritten across calls to IncrementToken()

      DoSomethingWith(new BytesRef(bytes));
    }
  }
  ...

Note

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

this is a very expert API, please use CharTermAttribute and its implementation of this method for UTF-8 terms.

Inherited Members

IAttribute.CopyTo(IAttribute)

Namespace: Lucene.Net.Analysis.TokenAttributes

Assembly: Lucene.Net.dll

Syntax

public interface ITermToBytesRefAttribute : IAttribute

Properties

BytesRef

Retrieve this attribute's BytesRef. The bytes are updated from the current term when the consumer calls FillBytesRef().

Declaration

BytesRef BytesRef { get; }

Property Value

Type	Description
BytesRef	this IAttributes internal BytesRef.

Methods

FillBytesRef()

Updates the bytes BytesRef to contain this term's final encoding.

Declaration

void FillBytesRef()