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https://issues.apache.org/jira/browse/LUCY-66?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marvin Humphrey updated LUCY-66:
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Attachment: TestIndexFileNames.c
TestIndexFileNames.bp
033-index_file_names.t
> Lucy::Util::IndexFileNames -- utilities for processing index file paths
> -----------------------------------------------------------------------
>
> Key: LUCY-66
> URL: https://issues.apache.org/jira/browse/LUCY-66
> Project: Lucy
> Issue Type: Improvement
> Components: Core
> Reporter: Marvin Humphrey
> Assignee: Marvin Humphrey
> Attachments: 033-index_file_names.t, index_file_names.diff,
> IndexFileNames.bp, IndexFileNames.c, IndexFileNames.pm,
> TestIndexFileNames.bp, TestIndexFileNames.c
>
>
> This implementation of IndexFileNames only supplies a handful of minor utility
> functions. It has has less in it than the corresponding Lucene class, because
> Lucy will delegate much more to the individual index components than Lucene.
> For instance, the top level library will remain ignorant of what DocWriter
> chooses to name its files. We choose never to rely on filename conventions so
> that replacement components can be swapped in without requiring that they
> write certain files or adhere to specific naming schemes.
> The only important function provided right now is IxFileNames_extract_gen:
> {code:none}
> /** Skip past the first instance of an underscore in the CharBuf, then
> * attempt to decode a base 36 number. For example, "snapshot_5.json"
> * yields 5, and "seg_a1" yields 27.
> *
> * @return a generation number, or 0 if no number can be extracted.
> */
> inert i32_t
> extract_gen(const CharBuf *name);
> {code}
> Later, after Folder is added, we'll add IxFileNames_latest_snapshot, which
> will scan the root level of a Folder for the snapshot file with the highest
> generation.
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