Package org.apache.sysds.runtime.transform.decode

Class DecoderComposite

java.lang.Object

org.apache.sysds.runtime.transform.decode.Decoder

org.apache.sysds.runtime.transform.decode.DecoderComposite

All Implemented Interfaces:

Externalizable, Serializable

public class DecoderComposite
extends Decoder

Simple composite decoder that applies a list of decoders in specified order. By implementing the default decoder API it can be used as a drop-in replacement for any other decoder.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
DecoderComposite()

Method Summary

Modifier and Type	Method	Description
FrameBlock	decode(MatrixBlock in, FrameBlock out)	Block decode API converting a matrix block into a frame block.
void	initMetaData(FrameBlock meta)
void	readExternal(ObjectInput in)	Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd deserialization.
Decoder	subRangeDecoder(int colStart, int colEnd, int dummycodedOffset)	Returns a new Decoder that only handles a sub range of columns.
void	updateIndexRanges(long[] beginDims, long[] endDims)	Update index-ranges to after decoding.
void	writeExternal(ObjectOutput out)	Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd serialization.

Methods inherited from class org.apache.sysds.runtime.transform.decode.Decoder

getColnames, getSchema, setColnames

Methods inherited from class java.lang.Object

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

Constructor Detail

DecoderComposite

public DecoderComposite()

Method Detail

decode

public FrameBlock decode(MatrixBlock in,
                         FrameBlock out)

Description copied from class: Decoder

Block decode API converting a matrix block into a frame block.

Specified by:

decode in class Decoder

Parameters:

in - input matrix block

out - output frame block

Returns:

returns given output frame block for convenience

subRangeDecoder

public Decoder subRangeDecoder(int colStart,
                               int colEnd,
                               int dummycodedOffset)

Description copied from class: Decoder

Returns a new Decoder that only handles a sub range of columns. The sub-range refers to the columns after decoding.

Overrides:

subRangeDecoder in class Decoder

Parameters:

colStart - the start index of the sub-range (1-based, inclusive)

colEnd - the end index of the sub-range (1-based, exclusive)

dummycodedOffset - the offset of dummycoded segments before colStart

Returns:

a decoder of the same type, just for the sub-range

updateIndexRanges

public void updateIndexRanges(long[] beginDims,
                              long[] endDims)

Description copied from class: Decoder

Update index-ranges to after decoding. Note that only Dummycoding changes the ranges.

Overrides:

updateIndexRanges in class Decoder

Parameters:

beginDims - the begin indexes before encoding

endDims - the end indexes before encoding

initMetaData

public void initMetaData(FrameBlock meta)

Specified by:

initMetaData in class Decoder

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Description copied from class: Decoder

Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd serialization.

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class Decoder

Parameters:

out - object output

Throws:

IOException - if IOException occurs

readExternal

public void readExternal(ObjectInput in)
                  throws IOException

Description copied from class: Decoder

Redirects the default java serialization via externalizable to our default hadoop writable serialization for efficient broadcast/rdd deserialization.

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class Decoder

Parameters:

in - object input

Throws:

IOException - if IOException occur