Package org.mariuszgromada.math.mxparser.mathcollection

Class PrimesCache

java.lang.Object

org.mariuszgromada.math.mxparser.mathcollection.PrimesCache

public class PrimesCache
extends Object

Class for generating prime numbers cache using Eratosthenes Sieve.

Version:

5.0.0

Author:

Mariusz Gromada
MathParser.org - mXparser project page
mXparser on GitHub
INFIMA place to purchase a commercial MathParser.org-mXparser software license
info@mathparser.org
ScalarMath.org - a powerful math engine and math scripting language
Scalar Lite
Scalar Pro
MathSpace.pl

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	CACHE_EMPTY	Empty cache status
static boolean	CACHING_FINISHED	Cache ready to use
static int	DEFAULT_MAX_NUM_IN_CACHE	Default range of integer to store in cache
static int	IS_NOT_PRIME	Indicator if given number is not a prime
static int	IS_PRIME	Indicator if given number is a prime
static int	NOT_IN_CACHE	Indicator that the value is not stored in cache

Constructor Summary

Constructors

Constructor	Description
PrimesCache()	Default constructor - setting prime cache for a default range if integers
PrimesCache(int maxNumInCache)	Constructor - setting prime cache for a given range if integers

Method Summary

Modifier and Type	Method	Description
boolean	getCacheStatus()	Returns cache status
double	getComputingTime()	Returns computing time of Eratosthenes Sieve
int	getMaxNumInCache()	Returns cache range.
int	getNumberOfPrimes()	Returns number of found primes.
boolean	isInitSuccessful()	Returns true in case when primes cache initialization was successful, otherwise returns false.
int	primeTest(int n)	Check whether given number is prime

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_MAX_NUM_IN_CACHE

public static final int DEFAULT_MAX_NUM_IN_CACHE

Default range of integer to store in cache

See Also:

Constant Field Values

CACHE_EMPTY

public static final boolean CACHE_EMPTY

Empty cache status

See Also:

Constant Field Values

CACHING_FINISHED

public static final boolean CACHING_FINISHED

Cache ready to use

See Also:

Constant Field Values

IS_PRIME

public static final int IS_PRIME

Indicator if given number is a prime

See Also:

Constant Field Values

IS_NOT_PRIME

public static final int IS_NOT_PRIME

Indicator if given number is not a prime

See Also:

Constant Field Values

NOT_IN_CACHE

public static final int NOT_IN_CACHE

Indicator that the value is not stored in cache

See Also:

Constant Field Values

Constructor Detail

PrimesCache

public PrimesCache()

Default constructor - setting prime cache for a default range if integers

PrimesCache

public PrimesCache(int maxNumInCache)

Constructor - setting prime cache for a given range if integers

Parameters:

maxNumInCache - Range of integers to be stored in prime cache

Method Detail

getComputingTime

public double getComputingTime()

Returns computing time of Eratosthenes Sieve

Returns:

Computing time in seconds

getCacheStatus

public boolean getCacheStatus()

Returns cache status

Returns:

PrimesCache.CACHE_EMPTY or PrimesCache.CACHING_FINISHED;

getNumberOfPrimes

public int getNumberOfPrimes()

Returns number of found primes.

Returns:

Number of found primes.

getMaxNumInCache

public int getMaxNumInCache()

Returns cache range.

Returns:

Maximum integera number in cache/

primeTest

public int primeTest(int n)

Check whether given number is prime

Parameters:

n - Given integer number.

Returns:

PrimesCache.IS_PRIME or PrimesCache.IS_NOT_PRIME or PrimesCache.NOT_IN_CACHE

isInitSuccessful

public boolean isInitSuccessful()

Returns true in case when primes cache initialization was successful, otherwise returns false.

Returns:

Returns true in case when primes cache initialization was successful, otherwise returns false.