io.druid.segment.data

Enum CompressionFactory.LongEncodingFormat

java.lang.Object

java.lang.Enum<CompressionFactory.LongEncodingFormat>

io.druid.segment.data.CompressionFactory.LongEncodingFormat

All Implemented Interfaces:

Serializable, Comparable<CompressionFactory.LongEncodingFormat>

Enclosing class:

CompressionFactory

public static enum CompressionFactory.LongEncodingFormat
extends Enum<CompressionFactory.LongEncodingFormat>

Enum Constant Summary

Enum Constants

Enum Constant and Description
DELTA DELTA format encodes a series of longs by finding the smallest value first, and stores all values as offset to the smallest value.
LONGS LONGS format encodes longs as is, using 8 bytes for each value.
TABLE TABLE format encodes a series of longs by mapping each unique value to an id, and string the id with the minimum number of bits similar to how DELTA stores offset.

Method Summary

Modifier and Type	Method and Description
static CompressionFactory.LongEncodingFormat	forId(byte id)
byte	getId()
abstract CompressionFactory.LongEncodingReader	getReader(ByteBuffer buffer, ByteOrder order)
static CompressionFactory.LongEncodingFormat	valueOf(String name) Returns the enum constant of this type with the specified name.
static CompressionFactory.LongEncodingFormat[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

DELTA

public static final CompressionFactory.LongEncodingFormat DELTA

DELTA format encodes a series of longs by finding the smallest value first, and stores all values as offset to the smallest value. The maximum value is also found to calculate how many bits are required to store each offset using VSizeLongSerde.

TABLE

public static final CompressionFactory.LongEncodingFormat TABLE

TABLE format encodes a series of longs by mapping each unique value to an id, and string the id with the minimum number of bits similar to how DELTA stores offset. TABLE format is only applicable to values with less unique values than CompressionFactory.MAX_TABLE_SIZE.

LONGS

public static final CompressionFactory.LongEncodingFormat LONGS

LONGS format encodes longs as is, using 8 bytes for each value.

Method Detail

values

public static CompressionFactory.LongEncodingFormat[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (CompressionFactory.LongEncodingFormat c : CompressionFactory.LongEncodingFormat.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static CompressionFactory.LongEncodingFormat valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null

getId

public byte getId()

getReader

public abstract CompressionFactory.LongEncodingReader getReader(ByteBuffer buffer,
                                                                ByteOrder order)

forId

public static CompressionFactory.LongEncodingFormat forId(byte id)