Package org.apache.sysds.runtime.compress.colgroup.offset

Class OffsetByte

java.lang.Object

org.apache.sysds.runtime.compress.colgroup.offset.AOffset

org.apache.sysds.runtime.compress.colgroup.offset.OffsetByte

All Implemented Interfaces:

Serializable

public class OffsetByte
extends AOffset

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.colgroup.offset.AOffset

AOffset.OffsetSliceInfo

Method Summary

Modifier and Type	Method	Description
AOffset	appendN(AOffsetsGroup[] g, int s)	Append a list of offsets together in order.
static long	estimateInMemorySize(int nOffs)
long	getExactSizeOnDisk()	Remember to include the ordinal of the type of offset list.
long	getInMemorySize()	Get the in memory size of the Offset object
AIterator	getIterator()	Get an iterator of the offsets while also maintaining the data index pointer.
AOffsetIterator	getOffsetIterator()	Get an OffsetIterator of current offsets not maintaining the data index.
int	getOffsetToFirst()	Get the offset to the first index
int	getOffsetToLast()	Get the offset to the last value
int	getSize()	Get the number of contained elements, This method iterate the entire offset list, so it is not constant lookup.
static OffsetByte	readFields(DataInput in)
void	write(DataOutput out)	Write the offsets to disk.

Methods inherited from class org.apache.sysds.runtime.compress.colgroup.offset.AOffset

append, cacheIterator, equals, getIterator, getOffsetIterator, preAggregateDenseMap, preAggregateSparseMap, reverse, slice, toString

Methods inherited from class java.lang.Object

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

Method Detail

getIterator

public AIterator getIterator()

Description copied from class: AOffset

Get an iterator of the offsets while also maintaining the data index pointer.

Specified by:

getIterator in class AOffset

Returns:

AIterator that iterate through index and dictionary offset values.

getOffsetIterator

public AOffsetIterator getOffsetIterator()

Description copied from class: AOffset

Get an OffsetIterator of current offsets not maintaining the data index.

Specified by:

getOffsetIterator in class AOffset

Returns:

AIterator that iterator through the delta offsets.

write

public void write(DataOutput out)
           throws IOException

Description copied from class: AOffset

Write the offsets to disk. If you implement another remember to write the ordinal of the new type to disk as well and add it to the OffsetFactory.

Specified by:

write in class AOffset

Parameters:

out - The output to write to

Throws:

IOException - Exception that happens if the IO fails to write.

getExactSizeOnDisk

public long getExactSizeOnDisk()

Description copied from class: AOffset

Remember to include the ordinal of the type of offset list.

Specified by:

getExactSizeOnDisk in class AOffset

Returns:

the size on disk as a long.

getSize

public int getSize()

Description copied from class: AOffset

Get the number of contained elements, This method iterate the entire offset list, so it is not constant lookup.

Specified by:

getSize in class AOffset

Returns:

The number of indexes.

getOffsetToFirst

public int getOffsetToFirst()

Description copied from class: AOffset

Get the offset to the first index

Specified by:

getOffsetToFirst in class AOffset

Returns:

The first index offset

getOffsetToLast

public int getOffsetToLast()

Description copied from class: AOffset

Get the offset to the last value

Specified by:

getOffsetToLast in class AOffset

Returns:

The last values offset

getInMemorySize

public long getInMemorySize()

Description copied from class: AOffset

Get the in memory size of the Offset object

Specified by:

getInMemorySize in class AOffset

Returns:

In memory size as a long.

estimateInMemorySize

public static long estimateInMemorySize(int nOffs)

readFields

public static OffsetByte readFields(DataInput in)
                             throws IOException

Throws:

IOException

appendN

public final AOffset appendN(AOffsetsGroup[] g,
                             int s)

Description copied from class: AOffset

Append a list of offsets together in order.

Overrides:

appendN in class AOffset

Parameters:

g - The offsets to append together (note fist entry is equal to this)

s - The standard size of each g (except last, but that does not matter)

Returns:

The combined offsets.