org.apache.cassandra.db

Class EmptyColumns

java.lang.Object

org.apache.cassandra.db.ColumnFamily

org.apache.cassandra.db.AbstractThreadUnsafeSortedColumns

org.apache.cassandra.db.EmptyColumns

All Implemented Interfaces:

java.lang.Iterable<Column>, IRowCacheEntry

public class EmptyColumns
extends AbstractThreadUnsafeSortedColumns

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.db.ColumnFamily

ColumnFamily.Factory<T extends ColumnFamily>

Field Summary

Fields

Modifier and Type	Field and Description
static ColumnFamily.Factory<EmptyColumns>	factory

Fields inherited from class org.apache.cassandra.db.AbstractThreadUnsafeSortedColumns

deletionInfo

Fields inherited from class org.apache.cassandra.db.ColumnFamily

metadata, serializer

Constructor Summary

Constructors

Constructor and Description
EmptyColumns(CFMetaData metadata, DeletionInfo info)

Method Summary

Methods

Modifier and Type	Method and Description
void	addAll(ColumnFamily cm, Allocator allocator, com.google.common.base.Function<Column,Column> transformation) Adds all the columns of a given column map to this column map.
void	addColumn(Column column, Allocator allocator) Adds a column to this column map.
void	clear() Clear this column family, removing all columns and deletion info.
ColumnFamily	cloneMe() Clones the column map.
Column	getColumn(java.nio.ByteBuffer name) Get a column given its name, returning null if the column is not present.
int	getColumnCount() Returns the number of columns in this map.
java.lang.Iterable<java.nio.ByteBuffer>	getColumnNames() Returns an iterable with the names of columns in this column map in the same order as the underlying columns themselves.
ColumnFamily.Factory<EmptyColumns>	getFactory() Returns the factory used for this ISortedColumns implementation.
java.util.Collection<Column>	getReverseSortedColumns() Returns the columns of this column map as a collection.
java.util.Collection<Column>	getSortedColumns() Returns the columns of this column map as a collection.
boolean	isInsertReversed() Returns if this map only support inserts in reverse order.
java.util.Iterator<Column>	iterator(ColumnSlice[] slices) Returns an iterator over the columns of this map that returns only the matching @param slices.
boolean	replace(Column oldColumn, Column newColumn) Replace oldColumn if present by newColumn.
java.util.Iterator<Column>	reverseIterator(ColumnSlice[] slices) Returns a reversed iterator over the columns of this map that returns only the matching @param slices.

Methods inherited from class org.apache.cassandra.db.AbstractThreadUnsafeSortedColumns

delete, delete, delete, deletionInfo, purgeTombstones, setDeletionInfo

Methods inherited from class org.apache.cassandra.db.ColumnFamily

addAll, addAtom, addColumn, addColumn, addColumn, addCounter, addIfRelevant, addTombstone, addTombstone, asMap, cloneMeShallow, cloneMeShallow, dataSize, delete, diff, diff, digest, equals, fromBytes, getColumnStats, getComparator, getType, hashCode, hasIrrelevantData, hasOnlyTombstones, id, inOrderDeletionTester, isEmpty, isMarkedForDelete, iterator, maxTimestamp, metadata, resolve, resolve, reverseIterator, toBytes, toString, updateDigest

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

factory

public static final ColumnFamily.Factory<EmptyColumns> factory

Constructor Detail

EmptyColumns

public EmptyColumns(CFMetaData metadata,
            DeletionInfo info)

Method Detail

cloneMe

public ColumnFamily cloneMe()

Description copied from class: ColumnFamily

Clones the column map.

Specified by:

cloneMe in class ColumnFamily

clear

public void clear()

Description copied from class: ColumnFamily

Clear this column family, removing all columns and deletion info.

Specified by:

clear in class ColumnFamily

getFactory

public ColumnFamily.Factory<EmptyColumns> getFactory()

Description copied from class: ColumnFamily

Returns the factory used for this ISortedColumns implementation.

Specified by:

getFactory in class ColumnFamily

addColumn

public void addColumn(Column column,
             Allocator allocator)

Description copied from class: ColumnFamily

Adds a column to this column map. If a column with the same name is already present in the map, it will be replaced by the newly added column.

Specified by:

addColumn in class ColumnFamily

addAll

public void addAll(ColumnFamily cm,
          Allocator allocator,
          com.google.common.base.Function<Column,Column> transformation)

Description copied from class: ColumnFamily

Adds all the columns of a given column map to this column map. This is equivalent to: for (Column c : cm) addColumn(c, ...); but is potentially faster.

Specified by:

addAll in class ColumnFamily

replace

public boolean replace(Column oldColumn,
              Column newColumn)

Description copied from class: ColumnFamily

Replace oldColumn if present by newColumn. Returns true if oldColumn was present and thus replaced. oldColumn and newColumn should have the same name.

Specified by:

replace in class ColumnFamily

getColumn

public Column getColumn(java.nio.ByteBuffer name)

Description copied from class: ColumnFamily

Get a column given its name, returning null if the column is not present.

Specified by:

getColumn in class ColumnFamily

getColumnNames

public java.lang.Iterable<java.nio.ByteBuffer> getColumnNames()

Description copied from class: ColumnFamily

Returns an iterable with the names of columns in this column map in the same order as the underlying columns themselves.

Specified by:

getColumnNames in class ColumnFamily

getSortedColumns

public java.util.Collection<Column> getSortedColumns()

Description copied from class: ColumnFamily

Returns the columns of this column map as a collection. The columns in the returned collection should be sorted as the columns in this map.

Specified by:

getSortedColumns in class ColumnFamily

getReverseSortedColumns

public java.util.Collection<Column> getReverseSortedColumns()

Description copied from class: ColumnFamily

Returns the columns of this column map as a collection. The columns in the returned collection should be sorted in reverse order of the columns in this map.

Specified by:

getReverseSortedColumns in class ColumnFamily

getColumnCount

public int getColumnCount()

Description copied from class: ColumnFamily

Returns the number of columns in this map.

Specified by:

getColumnCount in class ColumnFamily

iterator

public java.util.Iterator<Column> iterator(ColumnSlice[] slices)

Description copied from class: ColumnFamily

Returns an iterator over the columns of this map that returns only the matching @param slices. The provided slices must be in order and must be non-overlapping.

Specified by:

iterator in class ColumnFamily

reverseIterator

public java.util.Iterator<Column> reverseIterator(ColumnSlice[] slices)

Description copied from class: ColumnFamily

Returns a reversed iterator over the columns of this map that returns only the matching @param slices. The provided slices must be in reversed order and must be non-overlapping.

Specified by:

reverseIterator in class ColumnFamily

isInsertReversed

public boolean isInsertReversed()

Description copied from class: ColumnFamily

Returns if this map only support inserts in reverse order.

Specified by:

isInsertReversed in class ColumnFamily