core/org.gnit.lucenekmp.index/DirectoryReader/doOpenIfChanged

doOpenIfChanged

abstract fun doOpenIfChanged(): DirectoryReader?

Implement this method to support .openIfChanged. If this reader does not support reopen, return null, so client code is happy. This should be consistent with .isCurrent (should always return true) if reopen is not supported.

Return

null if there are no changes; else, a new DirectoryReader instance.

Throws

IOException

if there is a low-level IO error

abstract fun doOpenIfChanged(commit: IndexCommit?): DirectoryReader?

Implement this method to support .openIfChanged. If this reader does not support reopen from a specific IndexCommit, throw [ ].

Return

null if there are no changes; else, a new DirectoryReader instance.

Throws

IOException

if there is a low-level IO error

abstract fun doOpenIfChanged(writer: IndexWriter, applyAllDeletes: Boolean): DirectoryReader?

Implement this method to support .openIfChanged. If this reader does not support reopen from IndexWriter, throw [ ].

Return

null if there are no changes; else, a new DirectoryReader instance.

Throws

IOException

if there is a low-level IO error