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

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

- - ### Uses of IndexCommit in org.apache.lucene.index

    Fields in org.apache.lucene.index declared as IndexCommit
    Modifier and Type | Field and Description
    --- | ---
    `protected IndexCommit` | LiveIndexWriterConfig.`commit` `IndexCommit` that `IndexWriter` is opened on.
    `protected IndexCommit` | SnapshotDeletionPolicy.`lastCommit` Most recently committed `IndexCommit`.

    Fields in org.apache.lucene.index with type parameters of type IndexCommit
    Modifier and Type | Field and Description
    --- | ---
    `protected Map<Long,IndexCommit>` | SnapshotDeletionPolicy.`indexCommits` Used to map gen to IndexCommit.

    Methods in org.apache.lucene.index that return IndexCommit
    Modifier and Type | Method and Description
    --- | ---
    `IndexCommit` | FilterDirectoryReader.`getIndexCommit()`
    `IndexCommit` | StandardDirectoryReader.`getIndexCommit()`
    `IndexCommit` | IndexWriterConfig.`getIndexCommit()`
    `abstract IndexCommit` | DirectoryReader.`getIndexCommit()` Expert: return the IndexCommit that this reader has opened.
    `IndexCommit` | LiveIndexWriterConfig.`getIndexCommit()` Returns the `IndexCommit` as specified in `IndexWriterConfig.setIndexCommit(IndexCommit)` or the default, `null` which specifies to open the latest index commit point.
    `IndexCommit` | SnapshotDeletionPolicy.`getIndexCommit(long gen)` Retrieve an `IndexCommit` from its generation; returns null if this IndexCommit is not currently snapshotted
    `IndexCommit` | SnapshotDeletionPolicy.`snapshot()` Snapshots the last commit and returns it.
    `IndexCommit` | PersistentSnapshotDeletionPolicy.`snapshot()` Snapshots the last commit.

    Methods in org.apache.lucene.index that return types with arguments of type IndexCommit
    Modifier and Type | Method and Description
    --- | ---
    `List<IndexCommit>` | SnapshotDeletionPolicy.`getSnapshots()` Returns all IndexCommits held by at least one snapshot.
    `static List<IndexCommit>` | DirectoryReader.`listCommits(Directory dir)` Returns all commit points that exist in the Directory.

    Methods in org.apache.lucene.index with parameters of type IndexCommit
    Modifier and Type | Method and Description
    --- | ---
    `int` | IndexCommit.`compareTo(IndexCommit commit)`
    `protected DirectoryReader` | FilterDirectoryReader.`doOpenIfChanged(IndexCommit commit)`
    `protected DirectoryReader` | StandardDirectoryReader.`doOpenIfChanged(IndexCommit commit)`
    `protected abstract DirectoryReader` | DirectoryReader.`doOpenIfChanged(IndexCommit commit)` Implement this method to support `DirectoryReader.openIfChanged(DirectoryReader,IndexCommit)`.
    `protected void` | SnapshotDeletionPolicy.`incRef(IndexCommit ic)` Increments the refCount for this `IndexCommit`.
    `static DirectoryReader` | DirectoryReader.`open(IndexCommit commit)` Expert: returns an IndexReader reading the index in the given `IndexCommit`.
    `static DirectoryReader` | DirectoryReader.`open(IndexCommit commit, Map<String,String> readerAttributes)` Expert: returns an IndexReader reading the index in the given `IndexCommit`.
    `static DirectoryReader` | DirectoryReader.`openIfChanged(DirectoryReader oldReader, IndexCommit commit)` If the IndexCommit differs from what the provided reader is searching, open and return a new reader; else, return null.
    `void` | SnapshotDeletionPolicy.`release(IndexCommit commit)` Release a snapshotted commit.
    `void` | PersistentSnapshotDeletionPolicy.`release(IndexCommit commit)` Deletes a snapshotted commit.
    `T` | SegmentInfos.FindSegmentsFile.`run(IndexCommit commit)` Run `SegmentInfos.FindSegmentsFile.doBody(java.lang.String)` on the provided commit.
    `IndexWriterConfig` | IndexWriterConfig.`setIndexCommit(IndexCommit commit)` Expert: allows to open a certain commit point.

    Method parameters in org.apache.lucene.index with type arguments of type IndexCommit
    Modifier and Type | Method and Description
    --- | ---
    `void` | NoDeletionPolicy.`onCommit(List<? extends IndexCommit> commits)`
    `void` | SnapshotDeletionPolicy.`onCommit(List<? extends IndexCommit> commits)`
    `abstract void` | IndexDeletionPolicy.`onCommit(List<? extends IndexCommit> commits)` This is called each time the writer completed a commit.
    `void` | KeepOnlyLastCommitDeletionPolicy.`onCommit(List<? extends IndexCommit> commits)` Deletes all commits except the most recent one.
    `void` | NoDeletionPolicy.`onInit(List<? extends IndexCommit> commits)`
    `void` | SnapshotDeletionPolicy.`onInit(List<? extends IndexCommit> commits)`
    `abstract void` | IndexDeletionPolicy.`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.
    `void` | KeepOnlyLastCommitDeletionPolicy.`onInit(List<? extends IndexCommit> commits)` Deletes all commits except the most recent one.

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