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## org.apache.lucene.index
Class NoDeletionPolicy

    java.lang.Object
      org.apache.lucene.index.NoDeletionPolicy

All Implemented Interfaces:
  IndexDeletionPolicy

    public final class NoDeletionPolicy

extends Object
implements IndexDeletionPolicy

An `IndexDeletionPolicy` which keeps all index commits around, never deleting them. This class is a singleton and can be accessed by referencing `INSTANCE`.

Field Summary
`static IndexDeletionPolicy` | `INSTANCE` The single instance of this class.

Method Summary
`void` | `onCommit(List<? extends IndexCommit> commits)` This is called each time the writer completed a commit.
`void` | `onInit(List<? extends IndexCommit> commits)` This is called once when a writer is first instantiated to give the policy a chance to remove old commit points.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### INSTANCE

    public static final IndexDeletionPolicy INSTANCE

  The single instance of this class.

Method Detail

### onCommit

    public void onCommit(List<? extends IndexCommit> commits)
                  throws IOException

  Description copied from interface: `IndexDeletionPolicy`

  This is called each time the writer completed a commit. This gives the policy a chance to remove old commit points with each commit.

  The policy may now choose to delete old commit points by calling method `delete()` of `IndexCommit`.

  This method is only called when `IndexWriter.commit()` or `IndexWriter.close()` is called, or possibly not at all if the `IndexWriter.rollback()` is called.

  Note: the last CommitPoint is the most recent one, i.e. the "front index state". Be careful not to delete it, unless you know for sure what you are doing, and unless you can afford to lose the index content while doing that.

  Specified by:
    `onCommit` in interface `IndexDeletionPolicy`
  Parameters:
    `commits` - List of `IndexCommit`, sorted by age (the 0th one is the oldest commit).
  Throws:
    `IOException`

### onInit

    public void onInit(List<? extends IndexCommit> commits)
                throws IOException

  Description copied from interface: `IndexDeletionPolicy`

  This is called once when a writer is first instantiated to give the policy a chance to remove old commit points.

  The writer locates all index commits present in the index directory and calls this method. The policy may choose to delete some of the commit points, doing so by calling method `delete()` of `IndexCommit`.

  Note: the last CommitPoint is the most recent one, i.e. the "front index state". Be careful not to delete it, unless you know for sure what you are doing, and unless you can afford to lose the index content while doing that.

  Specified by:
    `onInit` in interface `IndexDeletionPolicy`
  Parameters:
    `commits` - List of current `point-in-time commits`, sorted by age (the 0th one is the oldest commit).
  Throws:
    `IOException`

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