Package org.elasticsearch.common.util

Enum Class ByteUtils

java.lang.Object
java.lang.Enum<ByteUtils>
org.elasticsearch.common.util.ByteUtils
All Implemented Interfaces:
Serializable, Comparable<ByteUtils>, Constable
public enum ByteUtils extends Enum<ByteUtils>
Utility methods to do byte-level encoding. These methods are biased towards little-endian byte order because it is the most common byte order and reading several bytes at once may be optimizable in the future with the help of sun.mist.Unsafe.

  • Nested Class Summary

    Nested classes/interfaces inherited from class java.lang.Enum

    Enum.EnumDesc<E extends Enum<E>>

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static int
    MAX_BYTES_VLONG
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static double
    readDoubleLE(byte[] arr, int offset)
    Read a double in little-endian format.
    static float
    readFloatLE(byte[] arr, int offset)
    Read a float in little-endian format.
    static int
    readIntLE(byte[] arr, int offset)
    Read an int in little-endian format.
    static long
    readLongLE(byte[] arr, int offset)
    Write a long in little-endian format.
    static long
    readVLong(org.apache.lucene.store.ByteArrayDataInput in)
    Same as DataOutput#readVLong but can read negative values (read on 9 bytes).
    static ByteUtils
    valueOf(String name)
    Returns the enum constant of this class with the specified name.
    static ByteUtils[]
    values()
    Returns an array containing the constants of this enum class, in the order they are declared.
    static void
    writeDoubleLE(double d, byte[] arr, int offset)
    Write a double in little-endian format.
    static void
    writeFloatLE(float d, byte[] arr, int offset)
    Write a float in little-endian format.
    static void
    writeIntLE(int l, byte[] arr, int offset)
    Write an int in little-endian format.
    static void
    writeLongLE(long l, byte[] arr, int offset)
    Write a long in little-endian format.
    static void
    writeVLong(org.apache.lucene.store.ByteArrayDataOutput out, long i)
    Same as DataOutput#writeVLong but accepts negative values (written on 9 bytes).
    static long
    zigZagDecode(long n)
    Zig-zag decode.
    static long
    zigZagEncode(long n)
    Zig-zag encode: this helps transforming small signed numbers into small positive numbers.

    Methods inherited from class java.lang.Enum

    clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

    Methods inherited from class java.lang.Object

    getClass, notify, notifyAll, wait, wait, wait

  • Field Details

  • Method Details

    • values

      public static ByteUtils[] values()
      Returns an array containing the constants of this enum class, in the order they are declared.
      Returns:
      an array containing the constants of this enum class, in the order they are declared

    • valueOf

      public static ByteUtils valueOf(String name)
      Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum class has no constant with the specified name
      NullPointerException - if the argument is null

    • zigZagDecode

      public static long zigZagDecode(long n)
      Zig-zag decode.

    • zigZagEncode

      public static long zigZagEncode(long n)
      Zig-zag encode: this helps transforming small signed numbers into small positive numbers.

    • writeLongLE

      public static void writeLongLE(long l, byte[] arr, int offset)
      Write a long in little-endian format.

    • readLongLE

      public static long readLongLE(byte[] arr, int offset)
      Write a long in little-endian format.

    • writeIntLE

      public static void writeIntLE(int l, byte[] arr, int offset)
      Write an int in little-endian format.

    • readIntLE

      public static int readIntLE(byte[] arr, int offset)
      Read an int in little-endian format.

    • writeDoubleLE

      public static void writeDoubleLE(double d, byte[] arr, int offset)
      Write a double in little-endian format.

    • readDoubleLE

      public static double readDoubleLE(byte[] arr, int offset)
      Read a double in little-endian format.

    • writeFloatLE

      public static void writeFloatLE(float d, byte[] arr, int offset)
      Write a float in little-endian format.

    • readFloatLE

      public static float readFloatLE(byte[] arr, int offset)
      Read a float in little-endian format.

    • writeVLong

      public static void writeVLong(org.apache.lucene.store.ByteArrayDataOutput out, long i)
      Same as DataOutput#writeVLong but accepts negative values (written on 9 bytes).

    • readVLong

      public static long readVLong(org.apache.lucene.store.ByteArrayDataInput in)
      Same as DataOutput#readVLong but can read negative values (read on 9 bytes).