public final class UuidFactory extends Object
Uuid
instances.
Included are methods to create a Uuid
with a given
128-bit value or a string representation of such a value, to
generate new Uuid
values, and to read a binary
representation of a Uuid
from a stream.
Modifier and Type | Method and Description |
---|---|
static Uuid |
create(long bits0,
long bits1)
Creates a new
Uuid with the specified 128-bit
value. |
static Uuid |
create(String s)
Creates a new
Uuid with the 128-bit value
represented by the specified string. |
static Uuid |
create(Uri urn)
Generate a Uuid from a RFC 4122 Compliant URN.
|
static Uuid |
generate()
Generates a new
Uuid with 122 bits of its value
produced from a cryptographically strong random sequence. |
static Uuid |
read(InputStream in)
Creates a new
Uuid with the 128-bit value obtained
by unmarshalling a binary representation from the supplied
InputStream . |
public static Uuid create(long bits0, long bits1)
Uuid
with the specified 128-bit
value.
This method can be used to create a Uuid
with a
value that has been previously generated, perhaps by an
external mechanism.
bits0
- the most significant 64 bits of the 128-bit valuebits1
- the least significant 64 bits of the 128-bit valueUuid
with the given valuepublic static Uuid create(Uri urn)
urn
- RFC 4122 Complaint URN.IllegalArgumentException
- if the supplied URN scheme isn't uri.public static Uuid create(String s)
Uuid
with the 128-bit value
represented by the specified string.
The supplied string representation must be in the format
defined by Uuid.toString
except that
uppercase hexadecimal digits are allowed.
s
- the string representation to create the
Uuid
withUuid
with the value represented by the
given stringIllegalArgumentException
- if the supplied string
representation does not conform to the specified formatNullPointerException
- if s
is
null
public static Uuid generate()
Uuid
with 122 bits of its value
produced from a cryptographically strong random sequence.
The value of a Uuid
returned by this method is
computationally difficult to guess and is highly likely to be
unique with respect to all other Uuid
values
returned by this method over space and time.
Specifically, this method creates a new Uuid
with the a variant
field of 0x2
, a
version
field of 0x4
, and the
remaining 122 bits of its value produced from a
cryptographically strong random sequence.
Uuid
SecureRandom
public static Uuid read(InputStream in) throws IOException
Uuid
with the 128-bit value obtained
by unmarshalling a binary representation from the supplied
InputStream
.
Specifically, this method reads 16 bytes from the stream,
and then it creates a new Uuid
with the 128-bit
value represented by those bytes interpreted in network
(big-endian) byte order.
in
- the InputStream
to read the
Uuid
fromUuid
with the value unmarshalled from
the streamIOException
- if an I/O exception occurs while performing
this operationNullPointerException
- if in
is
null
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