com.atomicleopard.expressive

Class Cast

java.lang.Object

com.atomicleopard.expressive.Cast

public final class Cast
extends Object

Utility class which provides casting operations.

as(Object, Class) performs a cast operation, returning null if a cast is not valid.
This allows illegal cast syntax to be more elegant and brief - a null check as opposed to a try/catch.

is(Object, Class) and its variants allow for quick type checking. Usually as(Object, Class) allows for more succinct code, but there are scenarios where type, or multiple type checking are useful.

Method Summary

Methods

Modifier and Type	Method and Description
static <S,T> S	as(T t, Class<S> s) Performs a cast operation of the parameter t to the type defined by the class s, or null if no legal cast can be made.
static <T> boolean	is(T t, Class<?>... s)
static <S,T> boolean	is(T t, Class<S> s)
static <T> boolean	is(T t, Iterable<Class<?>> s)

Methods inherited from class java.lang.Object

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

Method Detail

as

public static <S,T> S as(T t,
         Class<S> s)

Performs a cast operation of the parameter t to the type defined by the class s, or null if no legal cast can be made.

This allows illegal cast syntax to be more elegant and brief - a null check as opposed to a try/catch.

Returns null if t is null, in this case no type can be inferred.

Type Parameters:

S -

T -

Parameters:

t - object to cast

s - Class to cast the parameter t to

Returns:

t cast to the type of S, or null if this is not a legal cast.

is

public static <S,T> boolean is(T t,
               Class<S> s)

Parameters:

t - instance who's type is to be tested

s - a type as a Class

Returns:

true if the given t is of type s, that is a legal cast from T to S can occur.

is

public static <T> boolean is(T t,
             Class<?>... s)

Parameters:

t - instance who's type is to be tested

s - one or more Classes

Returns:

true if t is of any of the types in the varargs s, that is a legal cast can be made from T to at least one of the types contained in s

is

public static <T> boolean is(T t,
             Iterable<Class<?>> s)

Parameters:

t - instance who's type is to be tested

s - one or more Classes

Returns:

true if t is of any of the types in the varargs s, that is a legal cast can be made from T to at least one of the types contained in s