Add ability to open prior commits to IndexReader

• Key: LUCENE-1311
• Type: New Feature
• Status: Closed
• Resolution: Fixed
• Priority: Minor
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Component/s: Index
• Affects Version/s: 2.3
• Fix Version/s: 2.4

Description

If you use a customized DeletionPolicy, which keeps multiple commits
around (instead of the default which is to only preserve the most
recent commit), it's useful to be able to list all such commits and
then open a reader against one of these commits.

I've added this API to list commits:

public static Collection IndexReader.listCommits(Directory)

and these two new open methods to IndexReader to open a specific commit:

public static IndexReader open(IndexCommit)
public static IndexReader open(IndexCommit, IndexDeletionPolicy)

Spinoff from here:

http://mail-archives.apache.org/mod_mbox/lucene-java-dev/200806.mbox/[e-mail]%3e

Comments

[Michael McCandless]

Attached patch. All tests pass. I plan to commit in a day or two.