org.apache.lucene.analysis.tokenattributes

Interface TermToBytesRefAttribute

All Superinterfaces:

Attribute

All Known Subinterfaces:

BytesTermAttribute

All Known Implementing Classes:

BytesTermAttributeImpl, CharTermAttributeImpl, LegacyNumericTokenStream.LegacyNumericTermAttributeImpl, PackedTokenAttributeImpl, Token

public interface TermToBytesRefAttribute
extends Attribute

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 getBytesRef() for each term. Example:

   final TermToBytesRefAttribute termAtt = tokenStream.getAttribute(TermToBytesRefAttribute.class);

   while (tokenStream.incrementToken() {
     final BytesRef bytes = termAtt.getBytesRef();

     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(BytesRef.deepCopyOf(bytes));
     }
   }
   ...
 

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

This is a very expert and internal API, please use CharTermAttribute and its implementation for UTF-8 terms; to index binary terms, use BytesTermAttribute and its implementation.

Method Summary

Modifier and Type	Method and Description
BytesRef	getBytesRef() Retrieve this attribute's BytesRef.

Method Detail

getBytesRef

BytesRef getBytesRef()

Retrieve this attribute's BytesRef. The bytes are updated from the current term. The implementation may return a new instance or keep the previous one.

Returns:

a BytesRef to be indexed (only stays valid until token stream gets incremented)