Package com.atlassian.bamboo.utils

Class OptionalNarrow

java.lang.Object

com.atlassian.bamboo.utils.OptionalNarrow

public class OptionalNarrow
extends Object

Utility for narrowing object instances to Class types

Since:

5.10

Method Summary

Modifier and Type	Method	Description
static <T,R extends T> Function<T,Stream<R>>	down(Class<R> aClass)	Converts an object to a stream of object if object can be cast to aClass or an empty stream otherwise.
static <X,T extends X> @NotNull Function<X,Optional<T>>	downTo(@NotNull Class<T> aClass)
static <X,T extends X> Optional<T>	downTo(X o, @NotNull Class<T> aClass)	Should be used for casting down the hierarchy of classes.
static <R> @NotNull Function<Object,Optional<R>>	reinterpret(@NotNull Class<R> aClass)	Returns a Function that narrows supplied arguments.
static <T> Optional<T>	reinterpret(@Nullable Object o, @NotNull Class<T> aClass)	Narrows the given Object to the type of the Class.

Methods inherited from class java.lang.Object

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

Method Detail

reinterpret

public static <T> Optional<T> reinterpret(@Nullable
                                          @Nullable Object o,
                                          @NotNull
                                          @NotNull Class<T> aClass)

Narrows the given Object to the type of the Class. Using downTo(Object, Class) is always preferred over using this method. If object cannot be narrowed to the given type this method returns null This is a non-throwing form of Class.cast(Object)

Type Parameters:

T - the type to be narrowed to

Parameters:

o - the object to be narrowed. This object can be a null reference

aClass - the class to narrow to

Returns:

narrowed object

reinterpret

@NotNull
public static <R> @NotNull Function<Object,Optional<R>> reinterpret(@NotNull
                                                                          @NotNull Class<R> aClass)

Returns a Function that narrows supplied arguments.

downTo

@NotNull
public static <X,T extends X> @NotNull Function<X,Optional<T>> downTo(@NotNull
                                                                                  @NotNull Class<T> aClass)

downTo

public static <X,T extends X> Optional<T> downTo(@Nullable
                                                       X o,
                                                       @NotNull
                                                       @NotNull Class<T> aClass)

Should be used for casting down the hierarchy of classes.

down

public static <T,R extends T> Function<T,Stream<R>> down(Class<R> aClass)

Converts an object to a stream of object if object can be cast to aClass or an empty stream otherwise.