[jira] Resolved: (LUCY-66) Lucy::Util::IndexFileNames -- utilities for processing index file paths

["Marvin Humphrey (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCY-66?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marvin Humphrey resolved LUCY-66.
---------------------------------

    Resolution: Fixed

Committed as r882422.

> 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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