UUID (Red Hat JBoss Enterprise Application Platform 7.0.0.GA public API)

java.lang.Object
- org.apache.activemq.artemis.utils.UUID

```
public final class UUID
extends Object
```
UUID represents Universally Unique Identifiers (aka Global UID in Windows world). UUIDs are usually generated via UUIDGenerator (or in case of 'Null UUID', 16 zero bytes, via static method getNullUUID()), or received from external systems.
By default class caches the string presentations of UUIDs so that description is only created the first time it's needed. For memory stingy applications this caching can be turned off (note though that if uuid.toString() is never called, desc is never calculated so only loss is the space allocated for the desc pointer... which can of course be commented out to save memory).
Similarly, hash code is calculated when it's needed for the first time, and from thereon that value is just returned. This means that using UUIDs as keys should be reasonably efficient.
UUIDs can be compared for equality, serialized, cloned and even sorted. Equality is a simple bit-wise comparison. Ordering (for sorting) is done by first ordering based on type (in the order of numeric values of types), secondarily by time stamp (only for time-based time stamps), and finally by straight numeric byte-by-byte comparison (from most to least significant bytes).

Field Summary

Fields
Modifier and Type	Field and Description
`static byte`	`INDEX_CLOCK_HI`
`static byte`	`INDEX_CLOCK_LO`
`static byte`	`INDEX_CLOCK_MID`
`static byte`	`INDEX_CLOCK_SEQUENCE`
`static byte`	`INDEX_TYPE`
`static byte`	`INDEX_VARIATION`
`static String`	`NAMESPACE_DNS`
`static String`	`NAMESPACE_OID`
`static String`	`NAMESPACE_URL`
`static String`	`NAMESPACE_X500`
`static byte`	`TYPE_DCE`
`static byte`	`TYPE_NAME_BASED`
`static byte`	`TYPE_NULL`
`static byte`	`TYPE_RANDOM_BASED`
`static byte`	`TYPE_TIME_BASED`

Constructor Summary

Constructors
Constructor and Description

UUID(int type, byte[] data)

Constructors
Constructor and Description
`UUID(int type, byte[] data)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`byte[]`	`asBytes()`
`boolean`	`equals(Object o)` Checking equality of UUIDs is easy; just compare the 128-bit number.
`int`	`hashCode()`
`static byte[]`	`stringToBytes(String uuid)` Creates a 128bit number from the String representation of `UUID`.
`String`	`toString()`

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

- Field Detail
  - INDEX_CLOCK_HI
```
public static final byte INDEX_CLOCK_HI
```
    See Also:
    
    Constant Field Values
  - INDEX_CLOCK_MID
```
public static final byte INDEX_CLOCK_MID
```
    See Also:
    
    Constant Field Values
  - INDEX_CLOCK_LO
```
public static final byte INDEX_CLOCK_LO
```
    See Also:
    
    Constant Field Values
  - INDEX_TYPE
```
public static final byte INDEX_TYPE
```
    See Also:
    
    Constant Field Values
  - INDEX_CLOCK_SEQUENCE
```
public static final byte INDEX_CLOCK_SEQUENCE
```
    See Also:
    
    Constant Field Values
  - INDEX_VARIATION
```
public static final byte INDEX_VARIATION
```
    See Also:
    
    Constant Field Values
  - TYPE_NULL
```
public static final byte TYPE_NULL
```
    See Also:
    
    Constant Field Values
  - TYPE_TIME_BASED
```
public static final byte TYPE_TIME_BASED
```
    See Also:
    
    Constant Field Values
  - TYPE_DCE
```
public static final byte TYPE_DCE
```
    See Also:
    
    Constant Field Values
  - TYPE_NAME_BASED
```
public static final byte TYPE_NAME_BASED
```
    See Also:
    
    Constant Field Values
  - TYPE_RANDOM_BASED
```
public static final byte TYPE_RANDOM_BASED
```
    See Also:
    
    Constant Field Values
  - NAMESPACE_DNS
```
public static final String NAMESPACE_DNS
```
    See Also:
    
    Constant Field Values
  - NAMESPACE_URL
```
public static final String NAMESPACE_URL
```
    See Also:
    
    Constant Field Values
  - NAMESPACE_OID
```
public static final String NAMESPACE_OID
```
    See Also:
    
    Constant Field Values
  - NAMESPACE_X500
```
public static final String NAMESPACE_X500
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - UUID
```
public UUID(int type,
            byte[] data)
```
    Parameters:
    
    type - UUID type
    
    data - 16 byte UUID contents
- Method Detail
  - asBytes
```
public byte[] asBytes()
```
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - stringToBytes
```
public static byte[] stringToBytes(String uuid)
```
    Creates a 128bit number from the String representation of UUID.
    
    Parameters:
    
    uuid - The UUID
    
    Returns:
    
    byte array that can be used to recreate a UUID instance from the given String representation
  - equals
```
public boolean equals(Object o)
```
    Checking equality of UUIDs is easy; just compare the 128-bit number.
    
    Overrides:
    
    equals in class Object

Class UUID

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

INDEX_CLOCK_HI

INDEX_CLOCK_MID

INDEX_CLOCK_LO

INDEX_TYPE

INDEX_CLOCK_SEQUENCE

INDEX_VARIATION

TYPE_NULL

TYPE_TIME_BASED

TYPE_DCE

TYPE_NAME_BASED

TYPE_RANDOM_BASED

NAMESPACE_DNS

NAMESPACE_URL

NAMESPACE_OID

NAMESPACE_X500

Constructor Detail

UUID

Method Detail

asBytes

hashCode

toString

stringToBytes

equals