ReversibleCellScanner (Apache HBase 1.2.12 API)

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All Superinterfaces:

CellScanner

All Known Subinterfaces:

CellSearcher

All Known Implementing Classes:

PrefixTreeArrayReversibleScanner, PrefixTreeArraySearcher
```
@InterfaceAudience.Private
public interface ReversibleCellScanner
extends CellScanner
```
An extension of CellScanner indicating the scanner supports iterating backwards through cells.
Note: This was not added to suggest that HBase should support client facing reverse Scanners, but because some CellSearcher implementations, namely PrefixTree, need a method of backing up if the positionAt(..) method goes past the requested cell.

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`previous()` Try to position the scanner one Cell before the current position.
`boolean`	`previousRow(boolean endOfRow)` Try to position the scanner in the row before the current row.

Methods inherited from interface org.apache.hadoop.hbase.CellScanner
advance, current

- Method Detail
  - previous
```
boolean previous()
```
    Try to position the scanner one Cell before the current position.
    
    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
```
boolean previousRow(boolean endOfRow)
```
    Try to position the scanner in the row before the current row.
    
    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

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