de.alpharogroup.random

Class RandomExtensions

java.lang.Object

de.alpharogroup.random.RandomExtensions

public final class RandomExtensions
extends java.lang.Object

Utility class for producing random data. Existing name conventions: If the method starts with random* than it returns a primitive data type. If the method starts with getRandom* than it returns an object.

Constructor Summary

Constructors

Constructor and Description
RandomExtensions()

Method Summary

Modifier and Type	Method and Description
static <T> T	getRandomEntry(java.util.List<T> list) Returns a random entry from the given List.
static <K,V> java.lang.Object	getRandomEntry(java.util.Map<K,V> map) Returns a random entry from the given map.
static <T extends java.lang.Enum<?>> T	getRandomEnumFromClass(java.lang.Class<T> clazz) Gets the random enum.
static <T extends java.lang.Enum<?>> T	getRandomEnumFromClassname(java.lang.String classname) Gets the random enum.
static <T extends java.lang.Enum<?>> T	getRandomEnumFromEnumValues(T[] values) Gets the random enum.
static <T extends java.lang.Enum<?>> T	getRandomEnumFromObject(T obj) Gets the random enum.
static java.lang.String	getRandomHexString(int numberOfCharacters) Generates a random hexadecimal String
static <T> int	getRandomIndex(java.util.Collection<T> list) Returns a random index from the given List.
static <K,V> java.lang.Object	getRandomKey(java.util.Map<K,V> map) Returns a random key from the given map.
static byte[]	getRandomSalt(int length, java.nio.charset.Charset charset) Gets the random salt.
static java.lang.String	getRandomString() Generates a random string with a length between 3 and 25
static java.lang.String	getRandomString(int length) Generates a random string.
static java.lang.String	getRandomString(int start, int end) Generates a random string with a length between the given start and end
static java.lang.String	getRandomString(java.lang.String[] array) The Method randomString(String []) a random String from the Array For example: The Stringarray test as argument.
static java.lang.String	getRandomString(java.lang.String chars, int length) The Method randomString(String, int) makes an random String from the given String and to the spezified length.
static int	newRandomPixel() Generates a random int for use with pixel.
static int	newRandomPixel(int red, int green, int blue, int alpha) Generates a random int for use with pixel.
static byte[]	newSalt() Factory method for create a new random salt.
static java.math.BigInteger	randomSerialNumber() Returns a random serial number that can be used for a serial number.
static java.lang.String	randomToken() Returns a random token for use in web services.
static java.util.UUID	randomUUID() Factory method for create a new random UUID

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomExtensions

public RandomExtensions()

Method Detail

newRandomPixel

public static int newRandomPixel()

Generates a random int for use with pixel.

Returns:

a random int for use with pixel.

newRandomPixel

public static int newRandomPixel(int red,
                                 int green,
                                 int blue,
                                 int alpha)

Generates a random int for use with pixel.

Parameters:

red - The red value.

green - The green value.

blue - The blue value.

alpha - The alpha value.

Returns:

a random int for use with pixel.

getRandomEntry

public static <T> T getRandomEntry(java.util.List<T> list)

Returns a random entry from the given List.

Type Parameters:

T - the generic type

Parameters:

list - The List.

Returns:

Return's a random entry from the List.

getRandomEntry

public static <K,V> java.lang.Object getRandomEntry(java.util.Map<K,V> map)

Returns a random entry from the given map.

Type Parameters:

K - the key type

V - the value type

Parameters:

map - The map.

Returns:

Return's a random entry from the map.

getRandomEnumFromClass

public static <T extends java.lang.Enum<?>> T getRandomEnumFromClass(java.lang.Class<T> clazz)

Gets the random enum.

Type Parameters:

T - the generic type

Parameters:

clazz - the clazz

Returns:

the random enum

getRandomEnumFromClassname

public static <T extends java.lang.Enum<?>> T getRandomEnumFromClassname(java.lang.String classname)

Gets the random enum.

Type Parameters:

T - the generic type

Parameters:

classname - the classname

Returns:

the random enum

getRandomEnumFromObject

public static <T extends java.lang.Enum<?>> T getRandomEnumFromObject(T obj)

Gets the random enum.

Type Parameters:

T - the generic type

Parameters:

obj - the obj

Returns:

the random enum

getRandomEnumFromEnumValues

public static <T extends java.lang.Enum<?>> T getRandomEnumFromEnumValues(T[] values)

Gets the random enum.

Type Parameters:

T - the generic type

Parameters:

values - the values

Returns:

the random enum

getRandomIndex

public static <T> int getRandomIndex(java.util.Collection<T> list)

Returns a random index from the given List.

Type Parameters:

T - the generic type

Parameters:

list - The List.

Returns:

Return's a random index from the List.

getRandomKey

public static <K,V> java.lang.Object getRandomKey(java.util.Map<K,V> map)

Returns a random key from the given map.

Type Parameters:

K - the key type

V - the value type

Parameters:

map - The map.

Returns:

Return's a random key from the map.

getRandomString

public static java.lang.String getRandomString(int length)

Generates a random string.

Parameters:

length - the specified length.

Returns:

the generated random string.

getRandomHexString

public static java.lang.String getRandomHexString(int numberOfCharacters)

Generates a random hexadecimal String

Parameters:

numberOfCharacters - the number of characters

Returns:

the generated random hexadecimal String

getRandomString

public static java.lang.String getRandomString(java.lang.String chars,
                                               int length)

The Method randomString(String, int) makes an random String from the given String and to the spezified length. This can be used to produce passwords.

Parameters:

chars - The String to get the random chars.

length - The length from the random String.

Returns:

The produced random String.

getRandomString

public static java.lang.String getRandomString()

Generates a random string with a length between 3 and 25

Returns:

The produced random String.

getRandomString

public static java.lang.String getRandomString(int start,
                                               int end)

Generates a random string with a length between the given start and end

Parameters:

start - the start

end - the end

Returns:

the generated random string

getRandomString

public static java.lang.String getRandomString(java.lang.String[] array)

The Method randomString(String []) a random String from the Array For example: The Stringarray test as argument. Possible values: "blab", "flih", "klap", "teta", "brut", "gzft", "ccp". Possible selection can be one value from the Stringarray like "blab" or "klap".

Parameters:

array - The array with the String to be selected.

Returns:

The selected String from the array.

randomUUID

public static java.util.UUID randomUUID()

Factory method for create a new random UUID

Returns:

the new random UUID

randomToken

public static java.lang.String randomToken()

Returns a random token for use in web services.

Returns:

A random token.

randomSerialNumber

public static java.math.BigInteger randomSerialNumber()

Returns a random serial number that can be used for a serial number.

Returns:

a random serial number as a BigInteger object.

newSalt

public static byte[] newSalt()

Factory method for create a new random salt.

Returns:

the byte[] with the new random salt.

getRandomSalt

public static byte[] getRandomSalt(int length,
                                   java.nio.charset.Charset charset)

Gets the random salt.

Parameters:

length - the length

charset - the charset

Returns:

the random salt