org.apache.hadoop.hbase.codec.prefixtree.decode

Class PrefixTreeArrayReversibleScanner

java.lang.Object

org.apache.hadoop.hbase.codec.prefixtree.decode.PrefixTreeCell

org.apache.hadoop.hbase.codec.prefixtree.decode.PrefixTreeArrayScanner

org.apache.hadoop.hbase.codec.prefixtree.decode.PrefixTreeArrayReversibleScanner

All Implemented Interfaces:

Comparable<Cell>, Cell, CellScanner, ReversibleCellScanner

Direct Known Subclasses:

PrefixTreeArraySearcher

@InterfaceAudience.Private
public class PrefixTreeArrayReversibleScanner
extends PrefixTreeArrayScanner
implements ReversibleCellScanner

Methods for going backwards through a PrefixTree block. This class is split out on its own to simplify the Scanner superclass and Searcher subclass.

Field Summary

Fields inherited from class org.apache.hadoop.hbase.codec.prefixtree.decode.PrefixTreeArrayScanner

afterLast, beforeFirst, blockMeta, currentCellIndex, currentRowNode, familyReader, movedToPrevious, mvccVersionDecoder, nubCellsRemain, qualifierReader, rowNodes, rowNodeStackIndex, tagsReader, timestampDecoder

Fields inherited from class org.apache.hadoop.hbase.codec.prefixtree.decode.PrefixTreeCell

absoluteValueOffset, block, DEFAULT_TYPE, familyBuffer, familyLength, familyOffset, includeMvccVersion, mvccVersion, qualifierBuffer, qualifierLength, qualifierOffset, rowBuffer, rowLength, tagsBuffer, tagsLength, tagsOffset, timestamp, type, TYPES, valueLength

Constructor Summary

Constructors

Constructor and Description
PrefixTreeArrayReversibleScanner(PrefixTreeBlockMeta blockMeta, int rowTreeDepth, int rowBufferLength, int qualifierBufferLength, int tagsBufferLength) construct

Method Summary

Methods

Modifier and Type	Method and Description
protected void	descendToLastRowFromCurrentPosition()
boolean	equals(Object obj) Object methods
protected boolean	isDirectlyAfterNub()
protected void	positionAtLastCell()
protected void	positionAtLastRow()
boolean	previous() methods
boolean	previousRow(boolean endOfRow) Try to position the scanner in the row before the current row.

Methods inherited from class org.apache.hadoop.hbase.codec.prefixtree.decode.PrefixTreeArrayScanner

advance, appendCurrentTokenToRowBuffer, appendToRowBuffer, areBuffersBigEnough, current, discardCurrentRowNode, followCurrentFan, followFan, followFirstFan, followLastFan, followNextFan, followPreviousFan, getBlockMeta, getMaxRowTreeStackNodes, getNextFanIndex, getQualifierBufferLength, getRowBufferLength, getTagBufferLength, getTreeBytes, hashCode, hasMovedToPreviousAsPartOfSeek, hasOccurrences, initFirstNode, initOnBlock, isAfterLast, isBeforeFirst, isBranch, isFirstCellInRow, isLastCellInRow, isLeaf, isNub, isOutOfBounds, markAfterLast, markBeforeFirst, nextRow, nextRowInternal, popFromRowBuffer, populateFamily, populateFirstNonRowFields, populateLastNonRowFields, populateMvccVersion, populateNonRowFields, populateNonRowFieldsAndCompareTo, populatePreviousNonRowFields, populateQualifier, populateTag, populateTimestamp, populateType, populateValueOffsets, positionAtFirstCell, reInitFirstNode, releaseBlockReference, resetToBeforeFirstEntry, setMovedToPreviousAsPartOfSeek, toString

Methods inherited from class org.apache.hadoop.hbase.codec.prefixtree.decode.PrefixTreeCell

compareTo, getFamily, getFamilyArray, getFamilyLength, getFamilyOffset, getKeyValueString, getMvccVersion, getQualifier, getQualifierArray, getQualifierLength, getQualifierOffset, getRow, getRowArray, getRowLength, getRowOffset, getTagsArray, getTagsLength, getTagsLengthUnsigned, getTagsOffset, getTimestamp, getTypeByte, getValue, getValueArray, getValueLength, getValueOffset

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.hadoop.hbase.CellScanner

advance, current

Constructor Detail

PrefixTreeArrayReversibleScanner

public PrefixTreeArrayReversibleScanner(PrefixTreeBlockMeta blockMeta,
                                int rowTreeDepth,
                                int rowBufferLength,
                                int qualifierBufferLength,
                                int tagsBufferLength)

construct

Method Detail

equals

public boolean equals(Object obj)

Object methods

Overrides:

equals in class PrefixTreeArrayScanner

previous

public boolean previous()

methods

Specified by:

previous in interface ReversibleCellScanner

Returns:

true if the operation was successful, meaning getCurrentCell() will return a valid Cell.
false if there were no previous cells, meaning getCurrentCell() will return null. Scanner position will be CellScannerPosition.BEFORE_FIRST

previousRow

public boolean previousRow(boolean endOfRow)

Description copied from interface: ReversibleCellScanner

Try to position the scanner in the row before the current row.

Specified by:

previousRow in interface ReversibleCellScanner

Parameters:

endOfRow - true for the last cell in the previous row; false for the first cell

Returns:

true if the operation was successful, meaning getCurrentCell() will return a valid Cell.
false if there were no previous cells, meaning getCurrentCell() will return null. Scanner position will be CellScannerPosition.BEFORE_FIRST

isDirectlyAfterNub

protected boolean isDirectlyAfterNub()

positionAtLastRow

protected void positionAtLastRow()

descendToLastRowFromCurrentPosition

protected void descendToLastRowFromCurrentPosition()

positionAtLastCell

protected void positionAtLastCell()