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

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

Uses of MergePolicy in org.apache.lucene.index

Subclasses of MergePolicy in org.apache.lucene.index
`class` `LogByteSizeMergePolicy` This is a `LogMergePolicy` that measures size of a segment as the total byte size of the segment's files.
`class` `LogDocMergePolicy` This is a `LogMergePolicy` that measures size of a segment as the number of documents (not taking deletions into account).
`class` `LogMergePolicy` This class implements a `MergePolicy` that tries to merge segments into levels of exponentially increasing size, where each level has fewer segments than the value of the merge factor.
`class` `NoMergePolicy` A `MergePolicy` which never returns merges to execute (hence it's name).
`class` `TieredMergePolicy` Merges segments of approximately equal size, subject to an allowed number of segments per tier.
`class` `UpgradeIndexMergePolicy` This `MergePolicy` is used for upgrading all existing segments of an index when calling `IndexWriter.forceMerge(int)`.

Fields in org.apache.lucene.index declared as MergePolicy
`protected MergePolicy` `UpgradeIndexMergePolicy.base`
`static MergePolicy` `NoMergePolicy.COMPOUND_FILES` A singleton `NoMergePolicy` which indicates the index uses compound files.
`static MergePolicy` `NoMergePolicy.NO_COMPOUND_FILES` A singleton `NoMergePolicy` which indicates the index does not use compound files.

Methods in org.apache.lucene.index that return MergePolicy
`MergePolicy` `IndexWriterConfig.getMergePolicy()` Returns the current MergePolicy in use by this writer.
`MergePolicy` `IndexWriter.getMergePolicy()` Deprecated. use `IndexWriterConfig.getMergePolicy()` instead

Methods in org.apache.lucene.index with parameters of type MergePolicy
`IndexWriterConfig` `IndexWriterConfig.setMergePolicy(MergePolicy mergePolicy)` Expert: `MergePolicy` is invoked whenever there are changes to the segments in the index.
`void` `IndexWriter.setMergePolicy(MergePolicy mp)` Deprecated. use `IndexWriterConfig.setMergePolicy(MergePolicy)` instead.

Constructors in org.apache.lucene.index with parameters of type MergePolicy
`UpgradeIndexMergePolicy(MergePolicy base)` Wrap the given `MergePolicy` and intercept forceMerge requests to only upgrade segments written with previous Lucene versions.