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

Class OffsetEmpty

java.lang.Object

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

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

All Implemented Interfaces:

Serializable

public class OffsetEmpty
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

Constructor Summary

Constructors

Constructor	Description
OffsetEmpty()

Method Summary

Modifier and Type	Method	Description
void	constructSkipList()
static long	estimateInMemorySize()
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.
AIterator	getIterator(int row)	Get an iterator that is pointing at a specific offset.
int	getLength()	Get the length of the underlying array.
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.
AOffset	moveIndex(int m)	Move the index start x cells
static OffsetEmpty	readFields(DataInput in)
AOffset.OffsetSliceInfo	slice(int l, int u)	Slice the offsets based on the specified range
void	write(DataOutput out)	Write the offsets to disk.

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

append, appendN, cacheIterator, clearSkipList, equals, equals, preAggregateDenseMap, preAggSparseMap, reverse, toString, verify

Methods inherited from class java.lang.Object

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

Constructor Detail

OffsetEmpty

public OffsetEmpty()

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.

readFields

public static OffsetEmpty readFields(DataInput in)
                              throws IOException

Throws:

IOException

getIterator

public AIterator getIterator(int row)

Description copied from class: AOffset

Get an iterator that is pointing at a specific offset.

Overrides:

getIterator in class AOffset

Parameters:

row - The row requested.

Returns:

AIterator that iterate through index and dictionary offset values.

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()

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.

slice

public AOffset.OffsetSliceInfo slice(int l,
                                     int u)

Description copied from class: AOffset

Slice the offsets based on the specified range

Overrides:

slice in class AOffset

Parameters:

l - inclusive lower bound

u - exclusive upper bound

Returns:

The slice info containing the new slice.

moveIndex

public AOffset moveIndex(int m)

Description copied from class: AOffset

Move the index start x cells

Specified by:

moveIndex in class AOffset

Parameters:

m - The amount to move

Returns:

The moved index.

getLength

public int getLength()

Description copied from class: AOffset

Get the length of the underlying array. This does not reflect the number of contained elements, since some of the elements can be skips.

Specified by:

getLength in class AOffset

Returns:

The length of the underlying arrays

constructSkipList

public void constructSkipList()

Overrides:

constructSkipList in class AOffset