## Uses of Class
org.apache.lucene.index.IndexDeletionPolicy

Packages that use IndexDeletionPolicy
org.apache.lucene.index: Code to maintain and access indices.

### Uses of IndexDeletionPolicy in org.apache.lucene.index

Subclasses of IndexDeletionPolicy in org.apache.lucene.index
`class` `KeepOnlyLastCommitDeletionPolicy` This `IndexDeletionPolicy` implementation that keeps only the most recent commit and immediately removes all prior commits after a new commit is done.
`class` `NoDeletionPolicy` An `IndexDeletionPolicy` which keeps all index commits around, never deleting them.
`class` `PersistentSnapshotDeletionPolicy` A `SnapshotDeletionPolicy` which adds a persistence layer so that snapshots can be maintained across the life of an application.
`class` `SnapshotDeletionPolicy` An `IndexDeletionPolicy` that wraps any other `IndexDeletionPolicy` and adds the ability to hold and later release snapshots of an index.

Fields in org.apache.lucene.index declared as IndexDeletionPolicy
`protected IndexDeletionPolicy` LiveIndexWriterConfig.`delPolicy` `IndexDeletionPolicy` controlling when commit points are deleted.
`static IndexDeletionPolicy` NoDeletionPolicy.`INSTANCE` The single instance of this class.

Methods in org.apache.lucene.index that return IndexDeletionPolicy
`IndexDeletionPolicy` LiveIndexWriterConfig.`getIndexDeletionPolicy()` Returns the `IndexDeletionPolicy` specified in `IndexWriterConfig.setIndexDeletionPolicy(IndexDeletionPolicy)` or the default `KeepOnlyLastCommitDeletionPolicy`/
`IndexDeletionPolicy` IndexWriterConfig.`getIndexDeletionPolicy()`

Methods in org.apache.lucene.index with parameters of type IndexDeletionPolicy
`IndexWriterConfig` IndexWriterConfig.`setIndexDeletionPolicy(IndexDeletionPolicy delPolicy)` Expert: allows an optional `IndexDeletionPolicy` implementation to be specified.

Constructors in org.apache.lucene.index with parameters of type IndexDeletionPolicy
Constructor and Description
`PersistentSnapshotDeletionPolicy(IndexDeletionPolicy primary, Directory dir)` `PersistentSnapshotDeletionPolicy` wraps another `IndexDeletionPolicy` to enable flexible snapshotting, passing `IndexWriterConfig.OpenMode.CREATE_OR_APPEND` by default.
`PersistentSnapshotDeletionPolicy(IndexDeletionPolicy primary, Directory dir, IndexWriterConfig.OpenMode mode)` `PersistentSnapshotDeletionPolicy` wraps another `IndexDeletionPolicy` to enable flexible snapshotting.
`SnapshotDeletionPolicy(IndexDeletionPolicy primary)` Sole constructor, taking the incoming `IndexDeletionPolicy` to wrap.