## Uses of Class
org.apache.lucene.store.DataOutput

- Packages that use DataOutput
  Package | Description
  --- | ---
  org.apache.lucene.codecs | Codecs API: API for customization of the encoding and structure of the index.
  org.apache.lucene.codecs.compressing | StoredFieldsFormat that allows cross-document and cross-field compression of stored fields.
  org.apache.lucene.codecs.lucene84 | Components from the Lucene 8.4 index format.
  org.apache.lucene.index | Code to maintain and access indices.
  org.apache.lucene.search | Code to search indices.
  org.apache.lucene.store | Binary i/o API, used for all index data.
  org.apache.lucene.util | Some utility classes.
  org.apache.lucene.util.compress | Compression utilities.
  org.apache.lucene.util.fst | Finite state transducers
  org.apache.lucene.util.packed | Packed integer arrays and streams.

- - ### Uses of DataOutput in org.apache.lucene.codecs

    Methods in org.apache.lucene.codecs with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `abstract void` | PostingsWriterBase.`encodeTerm(DataOutput out, FieldInfo fieldInfo, BlockTermState state, boolean absolute)` Encode metadata as long[] and byte[].
    `static void` | CodecUtil.`verifyAndCopyIndexHeader(IndexInput in, DataOutput out, byte[] expectedID)` Expert: verifies the incoming `IndexInput` has an index header and that its segment ID matches the expected one, and then copies that index header into the provided `DataOutput`.
    `protected void` | MultiLevelSkipListWriter.`writeChildPointer(long childPointer, DataOutput skipBuffer)` Writes the child pointer of a block to the given output.
    `static void` | CodecUtil.`writeHeader(DataOutput out, String codec, int version)` Writes a codec header, which records both a string to identify the file and a version number.
    `static void` | CodecUtil.`writeIndexHeader(DataOutput out, String codec, int version, byte[] id, String suffix)` Writes a codec header for an index file, which records both a string to identify the format of the file, a version number, and data to identify the file instance (ID and auxiliary suffix such as generation).

  - ### Uses of DataOutput in org.apache.lucene.codecs.compressing

    Methods in org.apache.lucene.codecs.compressing with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `abstract void` | Compressor.`compress(byte[] bytes, int off, int len, DataOutput out)` Compress bytes into `out`.

  - ### Uses of DataOutput in org.apache.lucene.codecs.lucene84

    Methods in org.apache.lucene.codecs.lucene84 with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `void` | Lucene84PostingsWriter.`encodeTerm(DataOutput out, FieldInfo fieldInfo, BlockTermState _state, boolean absolute)`

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

    Methods in org.apache.lucene.index with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `static void` | SortFieldProvider.`write(SortField sf, DataOutput output)` Writes a SortField to a DataOutput
    `abstract void` | SortFieldProvider.`writeSortField(SortField sf, DataOutput out)` Writes a SortField to a DataOutput This is used to record index sort information in segment headers

    Constructors in org.apache.lucene.index with parameters of type DataOutput
    Constructor and Description
    `CorruptIndexException(String message, DataOutput output)` Create exception with a message only
    `CorruptIndexException(String message, DataOutput output, Throwable cause)` Create exception with message and root cause.

  - ### Uses of DataOutput in org.apache.lucene.search

    Methods in org.apache.lucene.search with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `void` | SortedNumericSortField.Provider.`writeSortField(SortField sf, DataOutput out)`
    `void` | SortField.Provider.`writeSortField(SortField sf, DataOutput out)`
    `void` | SortedSetSortField.Provider.`writeSortField(SortField sf, DataOutput out)`

  - ### Uses of DataOutput in org.apache.lucene.store

    Subclasses of DataOutput in org.apache.lucene.store
    Modifier and Type | Class and Description
    --- | ---
    `class` | `ByteArrayDataOutput` DataOutput backed by a byte array.
    `class` | `ByteBuffersDataOutput` A `DataOutput` storing data in a list of `ByteBuffer`s.
    `class` | `ByteBuffersIndexOutput` An `IndexOutput` writing to a `ByteBuffersDataOutput`.
    `class` | `GrowableByteArrayDataOutput` A `DataOutput` that can be used to build a byte[].
    `class` | `IndexOutput` A `DataOutput` for appending data to a file in a `Directory`.
    `class` | `OutputStreamDataOutput` A `DataOutput` wrapping a plain `OutputStream`.
    `class` | `OutputStreamIndexOutput` Implementation class for buffered `IndexOutput` that writes to an `OutputStream`.
    `class` | `RAMOutputStream` Deprecated. This class uses inefficient synchronization and is discouraged in favor of `MMapDirectory`. It will be removed in future versions of Lucene.
    `class` | `RateLimitedIndexOutput` A `rate limiting` `IndexOutput`

    Methods in org.apache.lucene.store with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `void` | ByteBuffersDataOutput.`copyTo(DataOutput output)` Copy the current content of this object into another `DataOutput`.
    `void` | RAMOutputStream.`writeTo(DataOutput out)` Deprecated. Copy the current contents of this buffer to the provided `DataOutput`.

  - ### Uses of DataOutput in org.apache.lucene.util

    Subclasses of DataOutput in org.apache.lucene.util
    Modifier and Type | Class and Description
    --- | ---
    `class` | `PagedBytes.PagedBytesDataOutput`

  - ### Uses of DataOutput in org.apache.lucene.util.compress

    Methods in org.apache.lucene.util.compress with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `static boolean` | LowercaseAsciiCompression.`compress(byte[] in, int len, byte[] tmp, DataOutput out)` Compress `in[0:len]` into `out`.
    `static void` | LZ4.`compress(byte[] bytes, int off, int len, DataOutput out, org.apache.lucene.util.compress.LZ4.HashTable ht)` Compress `bytes[off:off+len]` into `out` using at most 16kB of memory.
    `static void` | LZ4.`compressWithDictionary(byte[] bytes, int dictOff, int dictLen, int len, DataOutput out, org.apache.lucene.util.compress.LZ4.HashTable ht)` Compress `bytes[dictOff+dictLen:dictOff+dictLen+len]` into `out` using at most 16kB of memory.

  - ### Uses of DataOutput in org.apache.lucene.util.fst

    Methods in org.apache.lucene.util.fst with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `void` | FST.`save(DataOutput metaOut, DataOutput out)`
    `void` | ByteSequenceOutputs.`write(BytesRef prefix, DataOutput out)`
    `void` | CharSequenceOutputs.`write(CharsRef prefix, DataOutput out)`
    `void` | IntSequenceOutputs.`write(IntsRef prefix, DataOutput out)`
    `void` | PositiveIntOutputs.`write(Long output, DataOutput out)`
    `void` | NoOutputs.`write(Object prefix, DataOutput out)`
    `void` | PairOutputs.`write(PairOutputs.Pair<A,B> output, DataOutput writer)`
    `abstract void` | Outputs.`write(T output, DataOutput out)` Encode an output value into a `DataOutput`.
    `void` | Outputs.`writeFinalOutput(T output, DataOutput out)` Encode an final node output value into a `DataOutput`.
    `void` | OffHeapFSTStore.`writeTo(DataOutput out)`
    `void` | OnHeapFSTStore.`writeTo(DataOutput out)`
    `void` | FSTStore.`writeTo(DataOutput out)`

  - ### Uses of DataOutput in org.apache.lucene.util.packed

    Fields in org.apache.lucene.util.packed declared as DataOutput
    Modifier and Type | Field and Description
    --- | ---
    `protected DataOutput` | PackedInts.Writer.`out`

    Methods in org.apache.lucene.util.packed with parameters of type DataOutput
    Modifier and Type | Method and Description
    --- | ---
    `static DirectWriter` | DirectWriter.`getInstance(DataOutput output, long numValues, int bitsPerValue)` Returns an instance suitable for encoding `numValues` using `bitsPerValue`
    `static PackedInts.Writer` | PackedInts.`getWriter(DataOutput out, int valueCount, int bitsPerValue, float acceptableOverheadRatio)` Create a packed integer array writer for the given output, format, value count, and number of bits per value.
    `static PackedInts.Writer` | PackedInts.`getWriterNoHeader(DataOutput out, PackedInts.Format format, int valueCount, int bitsPerValue, int mem)` Expert: Create a packed integer array writer for the given output, format, value count, and number of bits per value.
    `void` | GrowableWriter.`save(DataOutput out)`
    `void` | PackedInts.Mutable.`save(DataOutput out)` Save this mutable into `out`.

    Constructors in org.apache.lucene.util.packed with parameters of type DataOutput
    Constructor and Description
    `BlockPackedWriter(DataOutput out, int blockSize)` Sole constructor.
    `MonotonicBlockPackedWriter(DataOutput out, int blockSize)` Sole constructor.
    `PackedDataOutput(DataOutput out)` Create a new instance that wraps `out`.
    `Writer(DataOutput out, int valueCount, int bitsPerValue)`

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