com.sleepycat.je.cleaner
Class PackedOffsets

java.lang.Object
  com.sleepycat.je.cleaner.PackedOffsets

All Implemented Interfaces:

LogReadable, LogWritable

public class PackedOffsets
extends Object
implements LogWritable, LogReadable

Stores a sorted list of LSN offsets in a packed short representation. Each stored value is the difference between two consecutive offsets. The stored values are stored as one or more shorts where each short holds 0x7fff values. Shorts are in LSB order. The value is negated if more shorts for the same offset follow; this works because offsets are always positive values.

Nested Class Summary

(package private) class

PackedOffsets.Iterator An iterator over all offsets.

Constructor Summary

PackedOffsets()
Creates an empty object.

Method Summary

void	dumpLog(StringBuffer buf, boolean verbose) Write the object into the string buffer for log dumping.
int	getLogSize()
long	getTransactionId() Never called.
(package private) PackedOffsets.Iterator	iterator() Returns an iterator over all offsets.
boolean	logEntryIsTransactional() Never called.
void	pack(long[] offsets) Packs the given offsets, replacing any offsets stored in this object.
void	readFromLog(ByteBuffer buf, byte entryTypeVersion) Initialize this object from the data in itemBuf.
(package private) long[]	toArray() Returns the unpacked offsets.
String	toString()
void	writeToLog(ByteBuffer buf) Serialize this object into the buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

PackedOffsets

public PackedOffsets()

Creates an empty object.

Method Detail

iterator

PackedOffsets.Iterator iterator()

Returns an iterator over all offsets.

pack

public void pack(long[] offsets)

Packs the given offsets, replacing any offsets stored in this object.

toArray

long[] toArray()

Returns the unpacked offsets.

getLogSize

public int getLogSize()

Specified by:

getLogSize in interface LogWritable

Returns:

number of bytes used to store this object.

See Also:

LogWritable.getLogSize()

writeToLog

public void writeToLog(ByteBuffer buf)

Description copied from interface: LogWritable

Serialize this object into the buffer.

Specified by:

writeToLog in interface LogWritable

Parameters:

buf - is the destination buffer

See Also:

LogWritable.writeToLog(java.nio.ByteBuffer)

readFromLog

public void readFromLog(ByteBuffer buf,
                        byte entryTypeVersion)

Description copied from interface: LogReadable

Initialize this object from the data in itemBuf.

Specified by:

readFromLog in interface LogReadable

See Also:

LogReadable.readFromLog(java.nio.ByteBuffer, byte)

dumpLog

public void dumpLog(StringBuffer buf,
                    boolean verbose)

Description copied from interface: LogReadable

Write the object into the string buffer for log dumping. Each object should be dumped without indentation or new lines and should be valid XML.

Specified by:

dumpLog in interface LogReadable

Parameters:

buf - destination string buffer

verbose - if true, dump the full, verbose version

See Also:

LogReadable.dumpLog(java.lang.StringBuffer, boolean)

getTransactionId

public long getTransactionId()

Never called.

Specified by:

getTransactionId in interface LogReadable

Returns:

return the transaction id if this log entry is transactional, 0 otherwise.

See Also:

LogReadable.getTransactionId()

logEntryIsTransactional

public boolean logEntryIsTransactional()

Never called.

Specified by:

logEntryIsTransactional in interface LogReadable

Returns:

true if the LogEntry is a transactional log entry type.

See Also:

LogReadable.logEntryIsTransactional()

toString

public String toString()

Overrides:

toString in class Object