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

Packages that use IndexDeletionPolicy
Package | Description
--- | ---
org.apache.lucene.index | Code to maintain and access indices.

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

Classes in org.apache.lucene.index that implement IndexDeletionPolicy
Modifier and Type | Class and Description
--- | ---
`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 around 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
Modifier and Type | Field and Description
--- | ---
`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
Modifier and Type | Method and Description
--- | ---
`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
Modifier and Type | Method and Description
--- | ---
`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, IndexWriterConfig.OpenMode mode, Version matchVersion)` `PersistentSnapshotDeletionPolicy` wraps another `IndexDeletionPolicy` to enable flexible snapshotting.
`SnapshotDeletionPolicy(IndexDeletionPolicy primary)` Sole constructor, taking the incoming `IndexDeletionPolicy` to wrap.
`SnapshotDeletionPolicy(IndexDeletionPolicy primary, Map<String,String> snapshotsInfo)` `SnapshotDeletionPolicy` wraps another `IndexDeletionPolicy` to enable flexible snapshotting.