[jira] [Created] (LUCENE-5158) Allow StoredFieldVisitor instances to be stateful

["Brendan Humphreys (JIRA)" <ji...@apache.org>]

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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