org.apache.cassandra.db.columniterator

Class SSTableReversedIterator

java.lang.Object

org.apache.cassandra.db.columniterator.SSTableReversedIterator

All Implemented Interfaces:

java.lang.AutoCloseable, java.util.Iterator<Unfiltered>, BaseRowIterator<Unfiltered>, SliceableUnfilteredRowIterator, UnfilteredRowIterator, CloseableIterator<Unfiltered>

public class SSTableReversedIterator
extends java.lang.Object

A Cell Iterator in reversed clustering order over SSTable

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	org.apache.cassandra.db.columniterator.AbstractSSTableIterator.IndexState

Field Summary

Fields

Modifier and Type	Field and Description
protected ColumnFilter	columns
protected SerializationHelper	helper
protected DecoratedKey	key
protected DeletionTime	partitionLevelDeletion
protected org.apache.cassandra.db.columniterator.AbstractSSTableIterator.Reader	reader
protected SSTableReader	sstable
protected Row	staticRow

Constructor Summary

Constructors

Constructor and Description
SSTableReversedIterator(SSTableReader sstable, DecoratedKey key, ColumnFilter columns, boolean isForThrift)
SSTableReversedIterator(SSTableReader sstable, FileDataInput file, DecoratedKey key, RowIndexEntry indexEntry, ColumnFilter columns, boolean isForThrift)

Method Summary

Modifier and Type	Method and Description
void	close()
PartitionColumns	columns() A subset of the columns for the (static and regular) rows returned by this iterator.
protected org.apache.cassandra.db.columniterator.AbstractSSTableIterator.Reader	createReader(RowIndexEntry indexEntry, FileDataInput file, boolean shouldCloseFile)
boolean	hasNext()
boolean	isReverseOrder() Whether or not the rows returned by this iterator are in reversed clustering order.
CFMetaData	metadata() The metadata for the table this iterator on.
Unfiltered	next()
DecoratedKey	partitionKey() The partition key of the partition this in an iterator over.
DeletionTime	partitionLevelDeletion() The partition level deletion for the partition this iterate over.
void	remove()
java.util.Iterator<Unfiltered>	slice(Slice slice) Move forward (resp.
Row	staticRow() The static part corresponding to this partition (this can be an empty row but cannot be null).
EncodingStats	stats() Return "statistics" about what is returned by this iterator.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.db.rows.UnfilteredRowIterator

isEmpty

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Detail

sstable

protected final SSTableReader sstable

key

protected final DecoratedKey key

partitionLevelDeletion

protected final DeletionTime partitionLevelDeletion

columns

protected final ColumnFilter columns

helper

protected final SerializationHelper helper

staticRow

protected final Row staticRow

reader

protected final org.apache.cassandra.db.columniterator.AbstractSSTableIterator.Reader reader

Constructor Detail

SSTableReversedIterator

public SSTableReversedIterator(SSTableReader sstable,
                               DecoratedKey key,
                               ColumnFilter columns,
                               boolean isForThrift)

SSTableReversedIterator

public SSTableReversedIterator(SSTableReader sstable,
                               FileDataInput file,
                               DecoratedKey key,
                               RowIndexEntry indexEntry,
                               ColumnFilter columns,
                               boolean isForThrift)

Method Detail

createReader

protected org.apache.cassandra.db.columniterator.AbstractSSTableIterator.Reader createReader(RowIndexEntry indexEntry,
                                                                                             FileDataInput file,
                                                                                             boolean shouldCloseFile)

isReverseOrder

public boolean isReverseOrder()

Description copied from interface: BaseRowIterator

Whether or not the rows returned by this iterator are in reversed clustering order.

metadata

public CFMetaData metadata()

Description copied from interface: BaseRowIterator

The metadata for the table this iterator on.

Specified by:

metadata in interface BaseRowIterator<Unfiltered>

columns

public PartitionColumns columns()

Description copied from interface: BaseRowIterator

A subset of the columns for the (static and regular) rows returned by this iterator. Every row returned by this iterator must guarantee that it has only those columns.

Specified by:

columns in interface BaseRowIterator<Unfiltered>

partitionKey

public DecoratedKey partitionKey()

Description copied from interface: BaseRowIterator

The partition key of the partition this in an iterator over.

Specified by:

partitionKey in interface BaseRowIterator<Unfiltered>

partitionLevelDeletion

public DeletionTime partitionLevelDeletion()

Description copied from interface: UnfilteredRowIterator

The partition level deletion for the partition this iterate over.

Specified by:

partitionLevelDeletion in interface UnfilteredRowIterator

staticRow

public Row staticRow()

Description copied from interface: BaseRowIterator

The static part corresponding to this partition (this can be an empty row but cannot be null).

Specified by:

staticRow in interface BaseRowIterator<Unfiltered>

stats

public EncodingStats stats()

Description copied from interface: UnfilteredRowIterator

Return "statistics" about what is returned by this iterator. Those are used for performance reasons (for delta-encoding for instance) and code should not expect those to be exact.

Specified by:

stats in interface UnfilteredRowIterator

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator<Unfiltered>

next

public Unfiltered next()

Specified by:

next in interface java.util.Iterator<Unfiltered>

slice

public java.util.Iterator<Unfiltered> slice(Slice slice)

Description copied from interface: SliceableUnfilteredRowIterator

Move forward (resp. backward if isReverseOrder() is true for the iterator) in the iterator and return an iterator over the Unfiltered selected by the provided slice.

Please note that successive calls to slice are allowed provided the slice are non overlapping and are passed in clustering (resp. reverse clustering) order. However, slice is allowed to leave the iterator in an unknown state and there is no guarantee over what a call to hasNext or next will yield after a call to slice. In other words, for a given iterator, you should either use slice or hasNext/next but not both.

Specified by:

slice in interface SliceableUnfilteredRowIterator

remove

public void remove()

Specified by:

remove in interface java.util.Iterator<Unfiltered>

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface CloseableIterator<Unfiltered>