org.apache.cassandra.db.composites

Interface CellName

All Superinterfaces:

Composite, IMeasurableMemory

All Known Implementing Classes:

AbstractNativeCell, CompoundDenseCellName, CompoundSparseCellName, CompoundSparseCellName.WithCollection, NativeCell, NativeCounterCell, NativeDeletedCell, NativeExpiringCell, SimpleDenseCellName, SimpleSparseCellName, SimpleSparseInternedCellName

public interface CellName
extends Composite

A CellName is a Composite, but for which, for the sake of CQL3, we distinguish different parts: a CellName has first a number of clustering components, followed by the CQL3 column name, and then possibly followed by a collection element part. The clustering prefix can itself be composed of multiple component. It can also be empty if the table has no clustering keys. In general, the CQL3 column name follows. However, some type of COMPACT STORAGE layout do not store the CQL3 column name in the cell name and so this part can be null (we call "dense" the cells whose name don't store the CQL3 column name). Lastly, if the cell is part of a CQL3 collection, we'll have a last component (a UUID for lists, an element for sets and a key for maps).

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.db.composites.Composite

Composite.EOC

Method Summary

Modifier and Type	Method and Description
int	clusteringSize() The number of clustering components.
java.nio.ByteBuffer	collectionElement() The value of the collection element, or null if the cell is not part of a collection (i.e.
CellName	copy(CFMetaData cfm, AbstractAllocator allocator)
ColumnIdentifier	cql3ColumnName(CFMetaData metadata) The name of the CQL3 column this cell represents.
boolean	isCollectionCell()
boolean	isSameCQL3RowAs(CellNameType type, CellName other) Whether this cell is part of the same CQL3 row as the other cell.
long	unsharedHeapSizeExcludingData()

Methods inherited from interface org.apache.cassandra.db.composites.Composite

dataSize, end, eoc, get, isEmpty, isPrefixOf, isStatic, size, slice, start, toByteBuffer, withEOC

Methods inherited from interface org.apache.cassandra.cache.IMeasurableMemory

unsharedHeapSize

Method Detail

clusteringSize

int clusteringSize()

The number of clustering components. It can be 0 if the table has no clustering columns, and it can be equal to size() if the table is dense() (in which case cql3ColumnName() will be null).

cql3ColumnName

ColumnIdentifier cql3ColumnName(CFMetaData metadata)

The name of the CQL3 column this cell represents. Will be null for cells of "dense" tables.

Parameters:

metadata -

collectionElement

java.nio.ByteBuffer collectionElement()

The value of the collection element, or null if the cell is not part of a collection (i.e. if !isCollectionCell()).

isCollectionCell

boolean isCollectionCell()

isSameCQL3RowAs

boolean isSameCQL3RowAs(CellNameType type,
                        CellName other)

Whether this cell is part of the same CQL3 row as the other cell.

copy

CellName copy(CFMetaData cfm,
              AbstractAllocator allocator)

Specified by:

copy in interface Composite

unsharedHeapSizeExcludingData

long unsharedHeapSizeExcludingData()