org.apache.cassandra.db.rows

Class RowIterators

java.lang.Object

org.apache.cassandra.db.rows.RowIterators

public abstract class RowIterators
extends java.lang.Object

Static methods to work with row iterators.

Method Summary

Modifier and Type	Method and Description
static void	digest(RowIterator iterator, java.security.MessageDigest digest, java.security.MessageDigest altDigest, java.util.Set<java.nio.ByteBuffer> columnsToExclude)
static RowIterator	loggingIterator(RowIterator iterator, java.lang.String id) Wraps the provided iterator so it logs the returned rows for debugging purposes.
static RowIterator	withOnlyQueriedData(RowIterator iterator, ColumnFilter filter) Filter the provided iterator to only include cells that are selected by the user.

Methods inherited from class java.lang.Object

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

Method Detail

digest

public static void digest(RowIterator iterator,
                          java.security.MessageDigest digest,
                          java.security.MessageDigest altDigest,
                          java.util.Set<java.nio.ByteBuffer> columnsToExclude)

withOnlyQueriedData

public static RowIterator withOnlyQueriedData(RowIterator iterator,
                                              ColumnFilter filter)

Filter the provided iterator to only include cells that are selected by the user.

Parameters:

iterator - the iterator to filter.

filter - the ColumnFilter to use when deciding which cells are queried by the user. This should be the filter that was used when querying iterator.

Returns:

the filtered iterator..

loggingIterator

public static RowIterator loggingIterator(RowIterator iterator,
                                          java.lang.String id)

Wraps the provided iterator so it logs the returned rows for debugging purposes.

Note that this is only meant for debugging as this can log a very large amount of logging at INFO.