Brendan Humphreys created LUCENE-5158:
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Summary: Allow StoredFieldVisitor instances to be stateful
Key: LUCENE-5158
URL: https://issues.apache.org/jira/browse/LUCENE-5158
Project: Lucene - Core
Issue Type: Improvement
Components: core/index
Affects Versions: 4.4
Reporter: Brendan Humphreys
Priority: Minor
Currently there is no way to build stateful {{StoredFieldVisitor}}s.
h3. Motivation
We would like to optimise our access to stored fields in our indexes by
utilising the {{StoredFieldVisitor.Status.STOP}} feature to stop processing
fields in a document. Unfortunately we have very large indexes, and rebuilding
them to have the required field order is not an option.
A stateful {{StoredFieldVisitor}} could solve this; it could track which fields
have been loaded for a document, and then {{STOP}} when the fields required
have been loaded, regardless of the order they were loaded.
h3. Implementation
I've added a no-op {{public void reset()}} method to the {{StoredFieldVisitor}}
base class, which gives a {{StoredFieldVisitor}} subclass an opportunity to
reset its state before the fields of the next document are processed. I've
added a call to {{reset()}} in all places the {{StoredFieldVisitor}} was being
used.
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