MobFileName (Apache HBase 2.5.0 API)

java.lang.Object
- org.apache.hadoop.hbase.mob.MobFileName

```
@InterfaceAudience.Private
public final class MobFileName
extends Object
```
The mob file name. It consists of a md5 of a start key, a date, uuid and encoded region name. It looks like md5(start) + date + uuid+ "_" + encoded region name.
1. characters 0-31: md5 hex string of a start key. Since the length of the start key is not fixed, have to use the md5 instead which has a fix length.
2. characters 32-39: a string of a date with format yyyymmdd. The date is the latest timestamp of cells in this file
3. the remaining characters: the uuid.
Using md5 hex string of start key as the prefix of file name makes files with the same start key unique, they're different from the ones with other start keys The cells come from different regions might be in the same mob file by region split, this is allowed. Has the latest timestamp of cells in the file name in order to clean the expired mob files by TTL easily. If this timestamp is older than the TTL, it's regarded as expired.

Field Summary

Fields
Modifier and Type	Field and Description
`private String`	`date`
`private static int`	`DATE_END_INDEX`
`private String`	`fileName`
`static String`	`REGION_SEP`
`private String`	`regionName`
`private String`	`startKey`
`private static int`	`STARTKEY_END_INDEX`
`private String`	`uuid`
`private static int`	`UUID_END_INDEX`

Constructor Summary

Constructors
Modifier	Constructor and Description
`private`	`MobFileName(byte[] startKey, String date, String uuid, String regionName)` n * The start key.
`private`	`MobFileName(String startKey, String date, String uuid, String regionName)` n * The md5 hex string of the start key.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static MobFileName`	`create(byte[] startKey, String date, String uuid, String regionName)` Creates an instance of MobFileName n * The md5 hex string of the start key.
`static MobFileName`	`create(String fileName)` Creates an instance of MobFileName.
`static MobFileName`	`create(String startKey, String date, String uuid, String regionName)` Creates an instance of MobFileName n * The md5 hex string of the start key.
`boolean`	`equals(Object anObject)`
`String`	`getDate()` Gets the date string.
`static String`	`getDateFromName(String fileName)` get date from MobFileName.
`String`	`getFileName()` Gets the file name.
`String`	`getRegionName()` Gets region name
`String`	`getStartKey()` Gets the hex string of the md5 for a start key.
`static String`	`getStartKeyFromName(String fileName)` get startKey from MobFileName.
`int`	`hashCode()`
`static boolean`	`isOldMobFileName(String name)`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - date
```
private final String date
```
  - startKey
```
private final String startKey
```
  - uuid
```
private final String uuid
```
  - fileName
```
private final String fileName
```
  - regionName
```
private final String regionName
```
  - STARTKEY_END_INDEX
```
private static final int STARTKEY_END_INDEX
```
    See Also:
    
    Constant Field Values
  - DATE_END_INDEX
```
private static final int DATE_END_INDEX
```
    See Also:
    
    Constant Field Values
  - UUID_END_INDEX
```
private static final int UUID_END_INDEX
```
    See Also:
    
    Constant Field Values
  - REGION_SEP
```
public static final String REGION_SEP
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - MobFileName
```
private MobFileName(byte[] startKey,
                    String date,
                    String uuid,
                    String regionName)
```
    n * The start key. n * The string of the latest timestamp of cells in this file, the format is yyyymmdd. n * The uuid
    
    Parameters:
    
    regionName - name of a region, where this file was created during flush or compaction.
  - MobFileName
```
private MobFileName(String startKey,
                    String date,
                    String uuid,
                    String regionName)
```
    n * The md5 hex string of the start key. n * The string of the latest timestamp of cells in this file, the format is yyyymmdd. n * The uuid
    
    Parameters:
    
    regionName - name of a region, where this file was created during flush or compaction.
- Method Detail
  - create
```
public static MobFileName create(byte[] startKey,
                                 String date,
                                 String uuid,
                                 String regionName)
```
    Creates an instance of MobFileName n * The md5 hex string of the start key. n * The string of the latest timestamp of cells in this file, the format is yyyymmdd.
    
    Parameters:
    
    uuid - The uuid.
    
    regionName - name of a region, where this file was created during flush or compaction.
    
    Returns:
    
    An instance of a MobFileName.
  - create
```
public static MobFileName create(String startKey,
                                 String date,
                                 String uuid,
                                 String regionName)
```
    Creates an instance of MobFileName n * The md5 hex string of the start key. n * The string of the latest timestamp of cells in this file, the format is yyyymmdd.
    
    Parameters:
    
    uuid - The uuid.
    
    regionName - name of a region, where this file was created during flush or compaction.
    
    Returns:
    
    An instance of a MobFileName.
  - create
```
public static MobFileName create(String fileName)
```
    Creates an instance of MobFileName.
    
    Parameters:
    
    fileName - The string format of a file name.
    
    Returns:
    
    An instance of a MobFileName.
  - isOldMobFileName
```
public static boolean isOldMobFileName(String name)
```
  - getStartKeyFromName
```
public static String getStartKeyFromName(String fileName)
```
    get startKey from MobFileName.
    
    Parameters:
    
    fileName - file name. n
  - getDateFromName
```
public static String getDateFromName(String fileName)
```
    get date from MobFileName.
    
    Parameters:
    
    fileName - file name. n
  - getStartKey
```
public String getStartKey()
```
    Gets the hex string of the md5 for a start key.
    
    Returns:
    
    The hex string of the md5 for a start key.
  - getRegionName
```
public String getRegionName()
```
    Gets region name
    
    Returns:
    
    name of a region, where this file was created during flush or compaction.
  - getDate
```
public String getDate()
```
    Gets the date string. Its format is yyyymmdd.
    
    Returns:
    
    The date string.
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object anObject)
```
    Overrides:
    
    equals in class Object
  - getFileName
```
public String getFileName()
```
    Gets the file name.
    
    Returns:
    
    The file name.

Class MobFileName

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

date

startKey

uuid

fileName

regionName

STARTKEY_END_INDEX

DATE_END_INDEX

UUID_END_INDEX

REGION_SEP

Constructor Detail

MobFileName

MobFileName

Method Detail

create

create

create

isOldMobFileName

getStartKeyFromName

getDateFromName

getStartKey

getRegionName

getDate

hashCode

equals

getFileName