Modifier and Type | Field and Description |
---|---|
protected byte[] |
buffer
A temporary buffer to serve random bytes.
|
protected int |
bufferSize |
protected boolean |
initialised
Indicate if this instance has already been initialised or not.
|
protected static int |
MIN_BUFFER_SIZE |
protected java.lang.String |
name
The canonical name prefix of the PRNG algorithm.
|
protected int |
ndx
The index into buffer of where the next byte will come from.
|
Modifier | Constructor and Description |
---|---|
protected |
BasePRNG(java.lang.String name)
Trivial constructor for use by concrete subclasses.
|
Modifier and Type | Method and Description |
---|---|
abstract java.lang.Object |
clone()
Returns a clone copy of this instance.
|
abstract void |
fillBlock() |
int |
getBufferSize() |
void |
init(java.util.Map attributes)
Initialises the pseudo-random number generator scheme with the
appropriate attributes.
|
boolean |
isInitialised() |
boolean |
isUseTRSU() |
java.lang.String |
name()
Returns the canonical name of this instance.
|
byte |
nextByte()
Returns the next 8 bits of random data generated from this instance.
|
void |
nextBytes(byte[] out,
int offset,
int length)
Fills the designated byte array, starting from byte at index
offset , for a maximum of length bytes with the
output of this generator instance. |
void |
setBufferSize(int bufSize) |
abstract void |
setup(java.util.Map attributes) |
protected java.lang.String name
protected boolean initialised
protected byte[] buffer
protected int ndx
protected static final int MIN_BUFFER_SIZE
protected int bufferSize
protected BasePRNG(java.lang.String name)
Trivial constructor for use by concrete subclasses.
name
- the canonical name of this instance.public int getBufferSize()
public java.lang.String name()
IRandom
Returns the canonical name of this instance.
public void init(java.util.Map attributes)
IRandom
Initialises the pseudo-random number generator scheme with the appropriate attributes.
public void setBufferSize(int bufSize)
public byte nextByte() throws java.lang.IllegalStateException, LimitReachedException
IRandom
Returns the next 8 bits of random data generated from this instance.
nextByte
in interface IRandom
java.lang.IllegalStateException
- if the instance is not yet initialised.LimitReachedException
- if this instance has reached its
theoretical limit for generating non-repetitive pseudo-random data.public void nextBytes(byte[] out, int offset, int length) throws java.lang.IllegalStateException, LimitReachedException
IRandom
Fills the designated byte array, starting from byte at index
offset
, for a maximum of length
bytes with the
output of this generator instance.
nextBytes
in interface IRandom
out
- the placeholder to contain the generated random bytes.offset
- the starting index in out to consider. This method
does nothing if this parameter is not within 0
and
out.length
.length
- the maximum number of required random bytes. This method
does nothing if this parameter is less than 1
.java.lang.IllegalStateException
- if the instance is not yet initialised.LimitReachedException
- if this instance has reached its
theoretical limit for generating non-repetitive pseudo-random data.public boolean isInitialised()
public abstract java.lang.Object clone()
IRandom
Returns a clone copy of this instance.
public abstract void setup(java.util.Map attributes)
public abstract void fillBlock() throws LimitReachedException
LimitReachedException
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