Package org.apache.iotdb.tsfile.encoding.encoder

Class DictionaryEncoder

java.lang.Object

org.apache.iotdb.tsfile.encoding.encoder.Encoder

org.apache.iotdb.tsfile.encoding.encoder.DictionaryEncoder

public class DictionaryEncoder
extends Encoder

An encoder implementing dictionary encoding.

Encoding format: 
 <map> <indexes>
 <map> := <map length> <map data>
 <map data> := [<entry size><entry data>]...
 <indexes> := [<index>]...
 

Field Summary

Fields inherited from class org.apache.iotdb.tsfile.encoding.encoder.Encoder

MAX_POINT_NUMBER, MAX_STRING_LENGTH

Constructor Summary

Constructors

Constructor	Description
DictionaryEncoder()

Method Summary

Modifier and Type	Method	Description
void	encode(Binary value, java.io.ByteArrayOutputStream out)
void	flush(java.io.ByteArrayOutputStream out)	Write all values buffered in memory cache to OutputStream.
long	getMaxByteSize()	The maximal possible memory size occupied by current Encoder.
int	getOneItemMaxSize()	When encoder accepts a new incoming data point, the maximal possible size in byte it takes to store in memory.

Methods inherited from class org.apache.iotdb.tsfile.encoding.encoder.Encoder

encode, encode, encode, encode, encode, encode, encode, getType, setType

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DictionaryEncoder

public DictionaryEncoder()

Method Detail

encode

public void encode(Binary value,
                   java.io.ByteArrayOutputStream out)

Overrides:

encode in class Encoder

flush

public void flush(java.io.ByteArrayOutputStream out)

Description copied from class: Encoder

Write all values buffered in memory cache to OutputStream.

Specified by:

flush in class Encoder

Parameters:

out - - ByteArrayOutputStream

getOneItemMaxSize

public int getOneItemMaxSize()

Description copied from class: Encoder

When encoder accepts a new incoming data point, the maximal possible size in byte it takes to store in memory.

Overrides:

getOneItemMaxSize in class Encoder

Returns:

the maximal possible size of one data item encoded by this encoder

getMaxByteSize

public long getMaxByteSize()

Description copied from class: Encoder

The maximal possible memory size occupied by current Encoder. This statistic value doesn't involve OutputStream.

Overrides:

getMaxByteSize in class Encoder

Returns:

the maximal size of possible memory occupied by current encoder