Package it.tidalwave.util

Class ReflectionUtils

java.lang.Object

it.tidalwave.util.ReflectionUtils

public class ReflectionUtils
extends Object

Adapted from this article

Author:

Ian Robertson, Fabrizio Giudici

Constructor Summary

Constructors

Constructor	Description
ReflectionUtils()

Method Summary

Modifier and Type	Method	Description
static Class<?>	getClass(Type type)	Returns the class literal associated to the given type.
static <T> List<Class<?>>	getTypeArguments(Class<T> baseClass, Class<? extends T> childClass)	Get the actual type arguments a subclass has used to extend a generic base class.
static void	injectDependencies(Object object, Map<Class<?>,Object> beans)	Performs dependency injection to an object by means of field introspection.
static <T> T	instantiateWithDependencies(Class<? extends T> type, Map<Class<?>,Object> beans)	Instantiates an object of the given class performing dependency injections through the constructor.

Methods inherited from class java.lang.Object

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

Constructor Details

ReflectionUtils

public ReflectionUtils()

Method Details

getTypeArguments

@Nonnull
public static <T> List<Class<?>> getTypeArguments(@Nonnull
 Class<T> baseClass,
 @Nonnull
 Class<? extends T> childClass)

Get the actual type arguments a subclass has used to extend a generic base class. Note: if the base class is an interface, this method will work only if it is the first inherited interface in childClass.

Type Parameters:

T - the static type of the base class

Parameters:

baseClass - the base class

childClass - the subclass

Returns:

a list of the raw classes for the actual type arguments.

instantiateWithDependencies

public static <T> T instantiateWithDependencies(@Nonnull
 Class<? extends T> type,
 @Nonnull
 Map<Class<?>,Object> beans)

Instantiates an object of the given class performing dependency injections through the constructor.

Type Parameters:

T - the generic type of the object to instantiate

Parameters:

type - the dynamic type of the object to instantiate; it is expected to have a single constructor

beans - the bag of objects to instantiate

Returns:

the new instance

Throws:

RuntimeException - if something fails

Since:

3.2-ALPHA-17

injectDependencies

public static void injectDependencies(@Nonnull
 Object object,
 @Nonnull
 Map<Class<?>,Object> beans)

Performs dependency injection to an object by means of field introspection.

Parameters:

object - the object

beans - the bag of objects to instantiate

Since:

3.2-ALPHA-17

getClass

@Nullable
public static Class<?> getClass(@Nonnull
 Type type)

Returns the class literal associated to the given type.

Parameters:

type - the type to inspect

Returns:

the class literal; it might be null if fails