Class DataOutput

Copy numBytes bytes from input to ourself.

Writes a single byte.

The most primitive data type is an eight-bit byte. Files are accessed as sequences of bytes. All other data types are defined as sequences of bytes, so file formats are byte-order independent.

Writes an array of bytes.

Writes an array of bytes.

Writes a short as two bytes.

NOTE: this was writeShort() in Lucene

Writes an as four bytes.

32-bit unsigned integer written as four bytes, high-order bytes first.

NOTE: this was writeInt() in Lucene

Writes a as eight bytes.

64-bit unsigned integer written as eight bytes, high-order bytes first.

NOTE: this was writeLong() in Lucene

Writes a string.

Writes strings as UTF-8 encoded bytes. First the length, in bytes, is written as a WriteVInt32(Int32), followed by the bytes.

Writes a set.

First the size is written as an WriteInt32(Int32), followed by each value written as a WriteString(String).

Writes a .

First the size is written as an WriteInt32(Int32), followed by each key-value pair written as two consecutive WriteString(String)s.

Writes an in a variable-length format. Writes between one and five bytes. Smaller values take fewer bytes. Negative numbers are supported, but should be avoided.

VByte is a variable-length format for positive integers is defined where the high-order bit of each byte indicates whether more bytes remain to be read. The low-order seven bits are appended as increasingly more significant bits in the resulting integer value. Thus values from zero to 127 may be stored in a single byte, values from 128 to 16,383 may be stored in two bytes, and so on.

VByte Encoding Example

this provides compression while still being efficient to decode.

NOTE: this was writeVInt() in Lucene

Writes an in a variable-length format. Writes between one and nine bytes. Smaller values take fewer bytes. Negative numbers are not supported.

The format is described further in WriteVInt32(Int32).

NOTE: this was writeVLong() in Lucene