io.neba.core.util

Class ReflectionUtil

java.lang.Object

io.neba.core.util.ReflectionUtil

public final class ReflectionUtil
extends Object

Author:

Olaf Otto

Method Summary

Methods

Modifier and Type	Method and Description
static Class<?>[]	getInstantiableCollectionTypes()
static Type	getLowerBoundOfSingleTypeParameter(Type type) Resolves the Type of the lower bound of a single type argument of a ParameterizedType.
static <K,T extends Collection<K>> Collection<K>	instantiateCollectionType(Class<T> collectionType) Creates an instance with a default capacity.
static <K,T extends Collection<K>> Collection<K>	instantiateCollectionType(Class<T> collectionType, int length) Provides an implementation instance for the desired collection type.
static boolean	isInstantiableCollectionType(Class<?> type)

Methods inherited from class java.lang.Object

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

Method Detail

getLowerBoundOfSingleTypeParameter

public static Type getLowerBoundOfSingleTypeParameter(Type type)

Resolves the Type of the lower bound of a single type argument of a ParameterizedType.

   private List<MyModel> myModel -> MyModel.
   private Optional<MyModel> myModel -> MyModel.
 

Parameters:

type - must not be null.

Returns:

never null.

instantiateCollectionType

public static <K,T extends Collection<K>> Collection<K> instantiateCollectionType(Class<T> collectionType,
                                                                  int length)

Provides an implementation instance for the desired collection type. Example: If the collection type is List, a suitable list implementation is instantiated.

Parameters:

collectionType - must not be null.

Returns:

never null. Throws an IllegalStateException if the collection type is not supported.

isInstantiableCollectionType

public static boolean isInstantiableCollectionType(Class<?> type)

Parameters:

type - must not be null.

Returns:

whether the given collection type can be instantiated using instantiateCollectionType(Class).

getInstantiableCollectionTypes

public static Class<?>[] getInstantiableCollectionTypes()

Returns:

an array of the types a collection type must be assignable from in order to be instantiable.

instantiateCollectionType

public static <K,T extends Collection<K>> Collection<K> instantiateCollectionType(Class<T> collectionType)

Creates an instance with a default capacity.

See Also:

instantiateCollectionType(Class, int)