Digester (Hive Standalone Metastore Common Code 4.0.0 API)

java.lang.Object
- org.apache.hadoop.hive.metastore.properties.Digester

```
public class Digester
extends Object
```
Helper class that creates a type 5 uuid.
This is computed from a set of updates using an SHA-1 message digest massaged into a UUID. see ...

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static interface Digester.Digestible
A marker interface for objects that can be digested.

Nested Classes
Modifier and Type	Class and Description
`static interface`	`Digester.Digestible` A marker interface for objects that can be digested.

Constructor Summary

Constructors
Constructor and Description

Digester()
Default ctor.

Digester(UUID namespace)
A type 5 uuid is namespace + sha1; namespace in our case is an uuid.

Constructors
Constructor and Description
`Digester()` Default ctor.
`Digester(UUID namespace)` A type 5 uuid is namespace + sha1; namespace in our case is an uuid.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Digester`	`copy()`
`Digester`	`digest(boolean b)` Updates the digest with a boolean.
`Digester`	`digest(byte[] bytes)` Updates the digest with a bytes array.
`Digester`	`digest(char c)` Updates the digest with a char.
`Digester`	`digest(Date date)` Updates the digest with a date.
`Digester`	`digest(Digester.Digestible digestible)` Updates the digest with an object that describes how it digests.
`Digester`	`digest(double f8)` Updates the digest with a double.
`Digester`	`digest(InputStream input)` Updates the digest with a stream.
`Digester`	`digest(int i4)` Updates the digest with an integer.
`Digester`	`digest(long l8)` Updates the digest with a long.
`Digester`	`digest(Object obj)` Updates the digest with any (serializable) object.
`Digester`	`digest(String str)` Updates the digest with a string.
`Digester`	`digest(URI uri)` Updates the digest with an uuid.
`Digester`	`digest(UUID uid)` Updates the digest with an uuid.
`UUID`	`getUUID()` Computes the version tag from this digester.

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

- Constructor Detail
  - Digester
```
public Digester(UUID namespace)
```
    A type 5 uuid is namespace + sha1; namespace in our case is an uuid. Two instances of digesters built with the same namespace will produce the same UUIDs from the same inputs.
    
    Parameters:
    
    namespace - the uuid namespace
  - Digester
```
public Digester()
```
    Default ctor. The created digester uses the class loading time as seed for its namespace; this means 2 instances of digester built in different JVM instances will *NOT* produce the same UUIDs for the same input. Typical use is in a non-persistent scenario, to verify an instance of an object has not been modified by checking its digested UUID remained the same. To get stable UUID computation across time and space in Digester usable in persistent scenario, you *NEED* to use a namespace-based digester using Digester(UUID), uuid that is easily created using UUID.nameUUIDFromBytes(byte[]) from any name/uri you might desire.
- Method Detail
  - copy
```
public Digester copy()
```
    Returns:
    
    a clone of this instance
  - getUUID
```
public UUID getUUID()
```
    Computes the version tag from this digester.
    This uses the current message digest state and resets it.
    
    Returns:
    
    the type 5 uuid
  - digest
```
public Digester digest(boolean b)
```
    Updates the digest with a boolean.
    
    Parameters:
    
    b - the boolean
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(char c)
```
    Updates the digest with a char.
    
    Parameters:
    
    c - the char
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(byte[] bytes)
```
    Updates the digest with a bytes array.
    
    Parameters:
    
    bytes - the bytes
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(int i4)
```
    Updates the digest with an integer.
    
    Parameters:
    
    i4 - the int
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(long l8)
```
    Updates the digest with a long.
    
    Parameters:
    
    l8 - the long
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(double f8)
```
    Updates the digest with a double.
    
    Parameters:
    
    f8 - the double
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(Date date)
```
    Updates the digest with a date.
    
    Parameters:
    
    date - the date
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(String str)
```
    Updates the digest with a string.
    
    Parameters:
    
    str - the string
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(UUID uid)
```
    Updates the digest with an uuid.
    
    Parameters:
    
    uid - the uuid
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(URI uri)
```
    Updates the digest with an uuid.
    
    Parameters:
    
    uri - the uri
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(Digester.Digestible digestible)
```
    Updates the digest with an object that describes how it digests.
    
    Parameters:
    
    digestible - the object
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(InputStream input)
```
    Updates the digest with a stream.
    
    Parameters:
    
    input - the stream
    
    Returns:
    
    this digester
  - digest
```
public Digester digest(Object obj)
```
    Updates the digest with any (serializable) object.
    
    Parameters:
    
    obj - the object
    
    Returns:
    
    this digester

Class Digester

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Digester

Digester

Method Detail

copy

getUUID

digest

digest

digest

digest

digest

digest

digest

digest

digest

digest

digest

digest

digest