org.danilopianini.lang

Class PrimitiveUtils

java.lang.Object

org.danilopianini.lang.PrimitiveUtils

public final class PrimitiveUtils
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
private static Map<Class<?>,Function<Number,? extends Number>>	NUMBER_CASTER
private static List<Class<?>>	PRIMITIVE_LIST
private static List<Class<?>>	PRIMITIVE_NUMBER_LIST
private static List<Class<?>>	WRAPPER_LIST
private static List<Class<? extends Number>>	WRAPPER_NUMBER_LIST

Constructor Summary

Constructors

Modifier	Constructor and Description
private	PrimitiveUtils()

Method Summary

Modifier and Type	Method and Description
static Optional<Number>	castIfNeeded(Class<?> dest, Number arg)
static boolean	classIsNumber(Class<?> clazz)
static boolean	classIsPrimitive(Class<?> clazz)
static boolean	classIsWrapper(Class<?> clazz)
static Class<? extends Number>	toPrimitiveWrapper(Number n) Given a Number, tries to guess at which wrapper-class it may belong.

Methods inherited from class java.lang.Object

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

Field Detail

NUMBER_CASTER

private static final Map<Class<?>,Function<Number,? extends Number>> NUMBER_CASTER

WRAPPER_NUMBER_LIST

private static final List<Class<? extends Number>> WRAPPER_NUMBER_LIST

PRIMITIVE_NUMBER_LIST

private static final List<Class<?>> PRIMITIVE_NUMBER_LIST

PRIMITIVE_LIST

private static final List<Class<?>> PRIMITIVE_LIST

WRAPPER_LIST

private static final List<Class<?>> WRAPPER_LIST

Constructor Detail

PrimitiveUtils

private PrimitiveUtils()

Method Detail

classIsWrapper

public static boolean classIsWrapper(Class<?> clazz)

Parameters:

clazz - the class under test

Returns:

true if the class is a primitive wrapper

classIsPrimitive

public static boolean classIsPrimitive(Class<?> clazz)

Parameters:

clazz - the class under test

Returns:

true if the class is a primitive wrapper

classIsNumber

public static boolean classIsNumber(Class<?> clazz)

Parameters:

clazz - the class under test

Returns:

true if the class is a subclass of Number or it is a number having primitive representation in Java

castIfNeeded

public static Optional<Number> castIfNeeded(Class<?> dest,
                                            Number arg)

Parameters:

dest - the desired number class

arg - the argument that may need to be cast

Returns:

a possibly cast version of the argument

toPrimitiveWrapper

public static Class<? extends Number> toPrimitiveWrapper(Number n)

Given a Number, tries to guess at which wrapper-class it may belong.

Parameters:

n - the Number

Returns:

The wrapper-class this Number actually belongs to, or Double.class if it is no wrapper