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

Class OffsetChar

java.lang.Object

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

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

All Implemented Interfaces:

Serializable, ISliceOffset

public class OffsetChar
extends AOffset
implements ISliceOffset

See Also:

• Serialized Form

Nested Class Summary

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

AOffset.OffsetSliceInfo, AOffset.RemoveEmptyOffsetsTmp

Method Summary

Modifier and Type	Method	Description
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.
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 OffsetChar	readFields(DataInput in)
AOffset.OffsetSliceInfo	slice(int lowOff, int highOff, int lowValue, int highValue, int low, int high)
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, constructSkipList, equals, equals, getIterator, preAggregateDenseMap, preAggSparseMap, removeEmptyRows, reverse, slice, toString, verify

Methods inherited from class java.lang.Object

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

Method Details

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.

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)

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

readFields

public static OffsetChar readFields(DataInput in)
                             throws IOException

Throws:

IOException

slice

public AOffset.OffsetSliceInfo slice(int lowOff,
 int highOff,
 int lowValue,
 int highValue,
 int low,
 int high)

Specified by:

slice in interface ISliceOffset

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