Bruno Roustant created LUCENE-8906:
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Summary: Lucene50PostingsReader.postings() casts BlockTermState
param to private IntBlockTermState
Key: LUCENE-8906
URL: https://issues.apache.org/jira/browse/LUCENE-8906
Project: Lucene - Core
Issue Type: Improvement
Components: core/codecs
Reporter: Bruno Roustant
Lucene50PostingsReader is the public API that offers the postings() method to
read the postings. Any PostingFormat can use it (as well as
Lucene50PostingsWriter) to read/write postings.
But the postings() method asks for a (public) BlockTermState param which is
internally cast to the private IntBlockTermState. This BlockTermState is
provided by Lucene50PostingsReader.newTermState().
public PostingsEnum postings(FieldInfo fieldInfo, BlockTermState termState,
PostingsEnum reuse, int flags)
This actually makes impossible to a custom PostingFormat customizing the Block
file structure to use this postings() method by providing their
(Int)BlockTermState, because they cannot access the FP fields of the
IntBlockTermState returned by PostingsReaderBase.newTermState().
Proposed change:
* Either make IntBlockTermState public, as well as its fields.
* Or replace it by an interface in the postings() method. In this case the
IntBlockTermState fields currently accessed directly would be replaced by
getter/setter.
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