com.facebook.presto.spi.block

Class AbstractRowBlock

java.lang.Object

com.facebook.presto.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 and Description
protected int	numFields

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractRowBlock(int numFields)

Method Summary

Modifier and Type	Method and Description
Block	copyPositions(List<Integer> positions) 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.
RowBlockEncoding	getEncoding() Get the encoding for this block.
protected int	getFieldBlockOffset(int position)
protected abstract int[]	getFieldBlockOffsets()
protected abstract Block[]	getFieldBlocks()
<T> T	getObject(int position, Class<T> clazz) Gets an object in the value at position.
protected abstract int	getOffsetBase()
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 logical size of block.getRegion(position, length) in memory.
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.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.facebook.presto.spi.block.Block

assureLoaded, bytesCompare, bytesEqual, compareTo, equals, getByte, getInt, getLong, getPositionCount, getRetainedSizeInBytes, getShort, getSizeInBytes, getSlice, getSliceLength, hash, retainedBytesForEachPart, writeBytesTo

Field Detail

numFields

protected final int numFields

Constructor Detail

AbstractRowBlock

protected AbstractRowBlock(int numFields)

Method Detail

getFieldBlocks

protected abstract Block[] getFieldBlocks()

getFieldBlockOffsets

protected abstract int[] getFieldBlockOffsets()

getOffsetBase

protected abstract int getOffsetBase()

getRowIsNull

protected abstract boolean[] getRowIsNull()

getFieldBlockOffset

protected int getFieldBlockOffset(int position)

getEncoding

public RowBlockEncoding getEncoding()

Description copied from interface: Block

Get the encoding for this block.

Specified by:

getEncoding in interface Block

copyPositions

public Block copyPositions(List<Integer> positions)

Description copied from interface: Block

Returns a block containing the specified positions. 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 logical size of block.getRegion(position, length) in memory.

Specified by:

getRegionSizeInBytes 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.

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

isNull

public boolean isNull(int position)

Description copied from interface: Block

Is the specified position null?

Specified by:

isNull in interface Block