## Uses of Class
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

    Subclasses of IndexDeletionPolicy in org.apache.lucene.index
    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 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` | NoDeletionPolicy.`clone()`
    `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)` `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.

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