metricapp.utility

Class RandomGenerator

java.lang.Object

metricapp.utility.RandomGenerator

public class RandomGenerator
extends java.lang.Object

This class provides a large number of methods to generate random fields and objects.

Every method can work statically, without the need of an instance of RandomGenerator. The random seed is initialized when the JVM load the class, the seed is the Nanosec of the moment of charge in memory. User has not to initialize this class to use it

Field Summary

Fields

Modifier and Type	Field and Description
private static java.util.Random	rnd seed is time from epoch

Constructor Summary

Constructors

Constructor and Description
RandomGenerator()

Method Summary

Methods

Modifier and Type	Method and Description
static java.util.ArrayList<java.lang.String>	randomArrayList() returns a random ArrayList of Strings, formatted like UUID.
static void	randomAttribute(java.lang.Object obj, java.lang.reflect.Field field) this function permits to fill a single field of an Object. you have to pass the object entity as Object, and the field gathered by reflection.
static boolean	randomBoolean() returns a random boolean
static double	randomDouble() returns a random double
static <T extends java.lang.Enum<?>> T	randomEnum(java.lang.Class<T> myEnumClass) e.g. for Enum State: randomEnum(State.class) = return State (State.getValue() = Approved) this function uses reflections to bring you a random element of a Enumeration.
static <T> java.util.ArrayList<T>	randomGenericArrayList(java.lang.Class<T> clazz) This is a generic method to create a randomized Array of an unknown (and supported by this module) class.
static long	randomInt() returns a random int
static LocalDate	randomLocalDate() provides a random date formatted as LocalDate between 1970 and 2300
static long	randomLong() returns a random long
static PointerBus	randomPointerBus() this function returns a new randomized PointerBus element
static java.lang.String	randomString() returns a randomString formatted as UUID.

Methods inherited from class java.lang.Object

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

Field Detail

rnd

private static java.util.Random rnd

seed is time from epoch

Constructor Detail

RandomGenerator

public RandomGenerator()

Method Detail

randomAttribute

public static void randomAttribute(java.lang.Object obj,
                   java.lang.reflect.Field field)
                            throws java.lang.IllegalArgumentException,
                                   java.lang.IllegalAccessException,
                                   java.lang.reflect.InvocationTargetException,
                                   java.lang.NoSuchMethodException,
                                   java.lang.SecurityException,
                                   java.lang.ClassNotFoundException,
                                   java.lang.InstantiationException

this function permits to fill a single field of an Object. you have to pass the object entity as Object, and the field gathered by reflection.

This function can randomize the content of field if it is a supported type, otherwise leave the field null. Behavior of the function is not predictable with unsupported field types This function supports a small number of ArrayList fields. This function could throw a large number of Exception, due to internal use of reflection with unknown classes. Due to implementation, entityType can not reflect real type of object!

Parameters:

obj - is the instance to fill. (e.g. class Car has String door, you have to pass randomAttribute(car, doorField))

field - is the field gathered by Reflection to fill up with random content. (e.g. Car.getClass().getAttributes()[0])

Throws:

java.lang.IllegalArgumentException

java.lang.IllegalAccessException

java.lang.reflect.InvocationTargetException

java.lang.NoSuchMethodException

java.lang.SecurityException

java.lang.ClassNotFoundException

java.lang.InstantiationException - TODO fix entityType generation, the object must be setted as the right type.

randomString

public static java.lang.String randomString()

returns a randomString formatted as UUID.

Returns:

randomBoolean

public static boolean randomBoolean()

returns a random boolean

Returns:

randomDouble

public static double randomDouble()

returns a random double

Returns:

randomLong

public static long randomLong()

returns a random long

Returns:

randomInt

public static long randomInt()

returns a random int

Returns:

randomPointerBus

public static PointerBus randomPointerBus()

this function returns a new randomized PointerBus element

Returns:

PointerBus randomized

randomArrayList

public static java.util.ArrayList<java.lang.String> randomArrayList()

returns a random ArrayList of Strings, formatted like UUID.

Returns:

randomGenericArrayList

public static <T> java.util.ArrayList<T> randomGenericArrayList(java.lang.Class<T> clazz)
                                                     throws java.lang.Exception

This is a generic method to create a randomized Array of an unknown (and supported by this module) class.

• Supported ArrayList:
• String,
• PointerBus

Parameters:

clazz - is the class of every element of the Array, is the parameter of the function

Returns:

an instace of a random ArrayList parameterized with clazz

Throws:

java.lang.Exception

randomLocalDate

public static LocalDate randomLocalDate()

provides a random date formatted as LocalDate between 1970 and 2300

Returns:

randomEnum

public static <T extends java.lang.Enum<?>> T randomEnum(java.lang.Class<T> myEnumClass)

e.g. for Enum State: randomEnum(State.class) = return State (State.getValue() = Approved) this function uses reflections to bring you a random element of a Enumeration. As a parameter it takes the Enum.class element, T is my enumeration like State or ScaleType