org.apache.cassandra.io
Class AbstractCompactedRow

java.lang.Object
  org.apache.cassandra.io.AbstractCompactedRow

Direct Known Subclasses:

LazilyCompactedRow, PrecompactedRow

public abstract class AbstractCompactedRow
extends java.lang.Object

a CompactedRow is an object that takes a bunch of rows (keys + columnfamilies) and can write a compacted version of those rows to an output stream. It does NOT necessarily require creating a merged CF object in memory.

Field Summary

DecoratedKey

key

Constructor Summary

AbstractCompactedRow(DecoratedKey key)

Method Summary

abstract int	columnCount()
abstract boolean	isEmpty()
abstract void	update(java.security.MessageDigest digest) update @param digest with the data bytes of the row (not including row key or row size)
abstract void	write(java.io.DataOutput out) write the row (size + column index + filter + column data, but NOT row key) to @param out

Methods inherited from class java.lang.Object

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

Field Detail

key

public final DecoratedKey key

Constructor Detail

AbstractCompactedRow

public AbstractCompactedRow(DecoratedKey key)

Method Detail

write

public abstract void write(java.io.DataOutput out)
                    throws java.io.IOException

write the row (size + column index + filter + column data, but NOT row key) to @param out

Throws:

java.io.IOException

update

public abstract void update(java.security.MessageDigest digest)

update @param digest with the data bytes of the row (not including row key or row size)

isEmpty

public abstract boolean isEmpty()

Returns:

true if there are no columns in the row AND there are no row-level tombstones to be preserved

columnCount

public abstract int columnCount()

Returns:

the number of columns in the row