com.facebook.presto.spi.block

Class AbstractMapBlock

java.lang.Object

com.facebook.presto.spi.block.AbstractMapBlock

All Implemented Interfaces:

Block

Direct Known Subclasses:

MapBlock, MapBlockBuilder

public abstract class AbstractMapBlock
extends Object
implements Block

Field Summary

Fields

Modifier and Type	Field and Description
protected MethodHandle	keyBlockNativeEquals
protected MethodHandle	keyNativeHashCode
protected Type	keyType

Constructor Summary

Constructors

Constructor and Description
AbstractMapBlock(Type keyType, MethodHandle keyNativeHashCode, MethodHandle keyBlockNativeEquals)

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.
BlockEncoding	getEncoding() Get the encoding for this block.
protected abstract int[]	getHashTables()
protected abstract Block	getKeys()
protected abstract boolean[]	getMapIsNull()
<T> T	getObject(int position, Class<T> clazz) Gets an object in the value at position.
protected abstract int	getOffsetBase() offset is entry-based, not position-based.
protected abstract int[]	getOffsets() offset is entry-based, not position-based.
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.
Block	getSingleValueBlock(int position) Gets the value at the specified position as a single element block.
protected abstract Block	getValues()
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

keyType

protected final Type keyType

keyNativeHashCode

protected final MethodHandle keyNativeHashCode

keyBlockNativeEquals

protected final MethodHandle keyBlockNativeEquals

Constructor Detail

AbstractMapBlock

public AbstractMapBlock(Type keyType,
                        MethodHandle keyNativeHashCode,
                        MethodHandle keyBlockNativeEquals)

Method Detail

getKeys

protected abstract Block getKeys()

getValues

protected abstract Block getValues()

getHashTables

protected abstract int[] getHashTables()

getOffsets

protected abstract int[] getOffsets()

offset is entry-based, not position-based. In other words, if offset[1] is 6, it means the first map has 6 key-value pairs, not 6 key/values (which would be 3 pairs).

getOffsetBase

protected abstract int getOffsetBase()

offset is entry-based, not position-based. (see getOffsets)

getMapIsNull

protected abstract boolean[] getMapIsNull()

getEncoding

public BlockEncoding 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