org.apache.cassandra.db.rows

Class Rows

java.lang.Object

org.apache.cassandra.db.rows.Rows

public abstract class Rows
extends java.lang.Object

Static utilities to work on Row objects.

Field Summary

Fields

Modifier and Type	Field and Description
static Row	EMPTY_STATIC_ROW

Method Summary

Modifier and Type	Method and Description
static int	collectStats(Row row, PartitionStatisticsCollector collector) Collect statistics ont a given row.
static Row.Builder	copy(Row row, Row.Builder builder)
static void	diff(RowDiffListener diffListener, Row merged, Columns columns, Row... inputs) Given the result (merged) of merging multiple inputs, signals the difference between each input and merged to diffListener.
static long	merge(Row existing, Row update, Columns mergedColumns, Row.Builder builder, int nowInSec)
static Row	merge(Row row1, Row row2, int nowInSec)

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_STATIC_ROW

public static final Row EMPTY_STATIC_ROW

Method Detail

copy

public static Row.Builder copy(Row row,
                               Row.Builder builder)

collectStats

public static int collectStats(Row row,
                               PartitionStatisticsCollector collector)

Collect statistics ont a given row.

Parameters:

row - the row for which to collect stats.

collector - the stats collector.

Returns:

the total number of cells in row.

diff

public static void diff(RowDiffListener diffListener,
                        Row merged,
                        Columns columns,
                        Row... inputs)

Given the result (merged) of merging multiple inputs, signals the difference between each input and merged to diffListener.

Parameters:

merged - the result of merging inputs.

columns - a superset of all the columns in any of merged/inputs.

inputs - the inputs whose merge yielded merged.

diffListener - the listener to which to signal the differences between the inputs and the merged result.

merge

public static Row merge(Row row1,
                        Row row2,
                        int nowInSec)

merge

public static long merge(Row existing,
                         Row update,
                         Columns mergedColumns,
                         Row.Builder builder,
                         int nowInSec)