org.apache.hadoop.hbase.codec.prefixtree.scanner

枚举 CellScannerPosition

java.lang.Object

java.lang.Enum<CellScannerPosition>

org.apache.hadoop.hbase.codec.prefixtree.scanner.CellScannerPosition

所有已实现的接口:

Serializable, Comparable<CellScannerPosition>

@InterfaceAudience.Private
public enum CellScannerPosition
extends Enum<CellScannerPosition>

An indicator of the state of the scanner after an operation such as nextCell() or positionAt(..). For example:

• In a DataBlockScanner, the AFTER_LAST position indicates to the parent StoreFileScanner that it should load the next block.
• In a StoreFileScanner, the AFTER_LAST position indicates that the file has been exhausted.
• In a RegionScanner, the AFTER_LAST position indicates that the scanner should move to the next region.

枚举常量概要

枚举常量

枚举常量和说明
AFTER getCurrentCell() will return a valid cell, but it is not the cell requested by positionAt(..), rather it is the nearest cell after the requested cell.
AFTER_LAST getCurrentCell() will NOT return a valid cell.
AT getCurrentCell() will return a valid cell, and it is exactly the cell that was requested by positionAt(..).
BEFORE getCurrentCell() will return a valid cell, but it is not the cell requested by positionAt(..), rather it is the nearest cell before the requested cell.
BEFORE_FIRST getCurrentCell() will NOT return a valid cell.

方法概要

方法

限定符和类型	方法和说明
static CellScannerPosition	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static CellScannerPosition[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

BEFORE_FIRST

public static final CellScannerPosition BEFORE_FIRST

getCurrentCell() will NOT return a valid cell. Calling nextCell() will advance to the first cell.

BEFORE

public static final CellScannerPosition BEFORE

getCurrentCell() will return a valid cell, but it is not the cell requested by positionAt(..), rather it is the nearest cell before the requested cell.

AT

public static final CellScannerPosition AT

getCurrentCell() will return a valid cell, and it is exactly the cell that was requested by positionAt(..).

AFTER

public static final CellScannerPosition AFTER

getCurrentCell() will return a valid cell, but it is not the cell requested by positionAt(..), rather it is the nearest cell after the requested cell.

AFTER_LAST

public static final CellScannerPosition AFTER_LAST

getCurrentCell() will NOT return a valid cell. Calling nextCell() will have no effect.

方法详细资料

values

public static CellScannerPosition[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (CellScannerPosition c : CellScannerPosition.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static CellScannerPosition valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值