io.sundr.model.functions

Class TypeCast

java.lang.Object

io.sundr.model.functions.TypeCast

All Implemented Interfaces:

Function<TypeRef,Optional<ClassRef>>

public class TypeCast
extends Object
implements Function<TypeRef,Optional<ClassRef>>

This function can be thought as Types.isInstanceOf(TypeRef, TypeDef, Function) with added bonus that generic arguments are resolved.

For example, when TypeCast.to(Map<?,?>) is called on HashMap<String, Integer, the result will be Optional.of(Map<String, Integer>).

This works also for complex hierarchies with non-trivial type argument substitutions.

Limitation: Arguments involving wildcards are currently not supported.

Method Summary

Modifier and Type	Method and Description
Optional<ClassRef>	apply(TypeRef type) Perform the type cast, if possible.
static TypeCast	to(ClassRef expectedType) Create the function which casts to the specified target type.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Method Detail

to

public static TypeCast to(ClassRef expectedType)

Create the function which casts to the specified target type.

Parameters:

expectedType - The type to which to cast. It must not be an array, and all type arguments (if any) must be unbounded wildcards

apply

public Optional<ClassRef> apply(TypeRef type)

Perform the type cast, if possible.

Specified by:

apply in interface Function<TypeRef,Optional<ClassRef>>

Parameters:

type - The type which will be cast

Returns:

If the type can be cast to target type, Optional.of(targetType<...>) is returned with the type arguments resolved. If the type cannot be cast, Optional.empty() is returned.

Throws:

IllegalStateException - when the type implements or extends target type multiple times with different arguments. Currently, this may also apply to multiple inheritance of wildcard types, even if they were compatible.