Package io.prestosql.spi.block

Class AbstractRowBlock

java.lang.Object

io.prestosql.spi.block.AbstractRowBlock

All Implemented Interfaces:

Block

Direct Known Subclasses:

RowBlock, RowBlockBuilder

public abstract class AbstractRowBlock
extends Object
implements Block

Field Summary

Fields

Modifier and Type	Field	Description
protected int	numFields

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractRowBlock(int numFields)

Method Summary

Modifier and Type	Method	Description
Block	copyPositions(int[] positions, int offset, int length)	Returns a block containing the specified positions.
Block	copyRegion(int position, int length)	Returns a block starting at the specified position and extends for the specified length.
List<Block>	getChildren()	Gets the direct child blocks of this block.
String	getEncodingName()	Get the encoding for this block.
long	getEstimatedDataSizeForStats(int position)	Returns the estimated in memory data size for stats of position.
protected int	getFieldBlockOffset(int position)
protected abstract int[]	getFieldBlockOffsets()
<T> T	getObject(int position, Class<T> clazz)	Gets an object in the value at position.
protected abstract int	getOffsetBase()
long	getPositionsSizeInBytes(boolean[] positions)	Returns the size of of all positions marked true in the positions array.
protected abstract Block[]	getRawFieldBlocks()
Block	getRegion(int position, int length)	Returns a block starting at the specified position and extends for the specified length.
long	getRegionSizeInBytes(int position, int length)	Returns the size of block.getRegion(position, length).
protected abstract boolean[]	getRowIsNull()
Block	getSingleValueBlock(int position)	Gets the value at the specified position as a single element block.
boolean	isNull(int position)	Is the specified position null?
void	writePositionTo(int position, BlockBuilder blockBuilder)	Appends the value at position to blockBuilder and close the entry.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.prestosql.spi.block.Block

bytesCompare, bytesEqual, compareTo, equals, getByte, getInt, getLoadedBlock, getLogicalSizeInBytes, getLong, getPositionCount, getPositions, getRetainedSizeInBytes, getShort, getSizeInBytes, getSlice, getSliceLength, hash, isLoaded, mayHaveNull, retainedBytesForEachPart, writeBytesTo

Field Detail

numFields

protected final int numFields

Constructor Detail

AbstractRowBlock

protected AbstractRowBlock(int numFields)

Method Detail

getChildren

public final List<Block> getChildren()

Description copied from interface: Block

Gets the direct child blocks of this block.

Specified by:

getChildren in interface Block

getRawFieldBlocks

protected abstract Block[] getRawFieldBlocks()

getFieldBlockOffsets

protected abstract int[] getFieldBlockOffsets()

getOffsetBase

protected abstract int getOffsetBase()

getRowIsNull

protected abstract boolean[] getRowIsNull()

getFieldBlockOffset

protected int getFieldBlockOffset(int position)

getEncodingName

public String getEncodingName()

Description copied from interface: Block

Get the encoding for this block.

Specified by:

getEncodingName in interface Block

copyPositions

public Block copyPositions(int[] positions,
                           int offset,
                           int length)

Description copied from interface: Block

Returns a block containing the specified positions. Positions to copy are stored in a subarray within positions array that starts at offset and has length of length. All specified positions must be valid for this block.

The returned block must be a compact representation of the original block.

Specified by:

copyPositions in interface Block

getRegion

public Block getRegion(int position,
                       int length)

Description copied from interface: Block

Returns a block starting at the specified position and extends for the specified length. The specified region must be entirely contained within this block.

The region can be a view over this block. If this block is released the region block may also be released. If the region block is released this block may also be released.

Specified by:

getRegion in interface Block

getRegionSizeInBytes

public long getRegionSizeInBytes(int position,
                                 int length)

Description copied from interface: Block

Returns the size of block.getRegion(position, length). The method can be expensive. Do not use it outside an implementation of Block.

Specified by:

getRegionSizeInBytes in interface Block

getPositionsSizeInBytes

public long getPositionsSizeInBytes(boolean[] positions)

Description copied from interface: Block

Returns the size of of all positions marked true in the positions array. This is equivalent to multiple calls of block.getRegionSizeInBytes(position, length) where you mark all positions for the regions first.

Specified by:

getPositionsSizeInBytes in interface Block

copyRegion

public Block copyRegion(int position,
                        int length)

Description copied from interface: Block

Returns a block starting at the specified position and extends for the specified length. The specified region must be entirely contained within this block.

The region returned must be a compact representation of the original block, unless their internal representation will be exactly the same. This method is useful for operators that hold on to a range of values without holding on to the entire block.

Specified by:

copyRegion in interface Block

getObject

public <T> T getObject(int position,
                       Class<T> clazz)

Description copied from interface: Block

Gets an object in the value at position.

Specified by:

getObject in interface Block

writePositionTo

public void writePositionTo(int position,
                            BlockBuilder blockBuilder)

Description copied from interface: Block

Appends the value at position to blockBuilder and close the entry.

Specified by:

writePositionTo in interface Block

getSingleValueBlock

public Block getSingleValueBlock(int position)

Description copied from interface: Block

Gets the value at the specified position as a single element block. The method must copy the data into a new block.

This method is useful for operators that hold on to a single value without holding on to the entire block.

Specified by:

getSingleValueBlock in interface Block

getEstimatedDataSizeForStats

public long getEstimatedDataSizeForStats(int position)

Description copied from interface: Block

Returns the estimated in memory data size for stats of position. Do not use it for other purpose.

Specified by:

getEstimatedDataSizeForStats in interface Block

isNull

public boolean isNull(int position)

Description copied from interface: Block

Is the specified position null?

Specified by:

isNull in interface Block