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Cumulus4j API (1.0.1) |
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java.lang.Objectorg.cumulus4j.keymanager.back.shared.IdentifierUtil
public class IdentifierUtil
Utility class for identifiers used within Cumulus4j.
Constructor Summary | |
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IdentifierUtil()
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Method Summary | |
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static String |
createRandomID()
Create a random String identifier with a sufficiently unique length. |
static String |
createRandomID(int length)
Create a random String identifier with a specified length. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public IdentifierUtil()
Method Detail |
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public static String createRandomID()
Create a random String
identifier with a sufficiently unique length.
This method calls createRandomID(int)
with a length
of 25.
The length
of 25 is chosen, because it produces an identifier
which has about the same uniqueness as UUID.randomUUID()
. This is because
the String has 36 ^ 25 (approximately equals 2 ^ 129) possible values while a UUID
has 2 ^ 128 possible values and both identifiers are created using the same
method (SecureRandom.nextBytes(byte[])
).
String
.createRandomID(int)
public static String createRandomID(int length)
Create a random String
identifier with a specified length.
The generated identifier will contain
only the characters '0'...'9' and 'a'...'z' and will have the specified length
.
This method uses a SecureRandom
(just like UUID.randomUUID()
). With a length
of 25, the identifier will have about the same uniqueness as a UUID
- see
createRandomID()
.
length
- the number of char
s in the result.
String
with the given length
.createRandomID()
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