io.micronaut.core.reflect

Class InstantiationUtils

java.lang.Object

io.micronaut.core.reflect.InstantiationUtils

public class InstantiationUtils
extends Object

Utility methods for instantiating objects.

Since:

1.0

Author:

Graeme Rocher

Constructor Summary

Constructors

Constructor and Description
InstantiationUtils()

Method Summary

Modifier and Type	Method and Description
static <T> T	instantiate(Class<T> type) Instantiate the given class rethrowing any exceptions as InstantiationException.
static <T> T	instantiate(String type, Class<T> requiredType) Instantiate the given class rethrowing any exceptions as InstantiationException.
static Object	instantiate(String type, ClassLoader classLoader) Instantiate the given class rethrowing any exceptions as InstantiationException.
static <T> Optional<T>	tryInstantiate(Class<T> type) Try to instantiate the given class using the most optimal strategy first trying the BeanIntrospector and if no bean is present falling back to reflection.
static <T> Optional<T>	tryInstantiate(Class<T> type, Map propertiesMap, ConversionContext context) Try to instantiate the given class using BeanIntrospector.
static <T> Optional<T>	tryInstantiate(Constructor<T> type, Object... args) Try to instantiate the given class.
static Optional<?>	tryInstantiate(String name, ClassLoader classLoader) Try to instantiate the given class.

Methods inherited from class java.lang.Object

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

Constructor Detail

InstantiationUtils

public InstantiationUtils()

Method Detail

tryInstantiate

public static Optional<?> tryInstantiate(String name,
                                         ClassLoader classLoader)

Try to instantiate the given class.

Parameters:

name - The class name

classLoader - The class loader to use

Returns:

The instantiated instance or Optional.empty()

tryInstantiate

@Nonnull
public static <T> Optional<T> tryInstantiate(@Nonnull
                                                      Class<T> type,
                                                      Map propertiesMap,
                                                      ConversionContext context)

Try to instantiate the given class using BeanIntrospector.

Type Parameters:

T - The generic type

Parameters:

type - The type

propertiesMap - The properties values Map of the instance

context - The Conversion context

Returns:

The instantiated instance or Optional.empty()

Throws:

InstantiationException - When an error occurs

tryInstantiate

@Nonnull
public static <T> Optional<T> tryInstantiate(@Nonnull
                                                      Class<T> type)

Try to instantiate the given class using the most optimal strategy first trying the BeanIntrospector and if no bean is present falling back to reflection.

Type Parameters:

T - The generic type

Parameters:

type - The type

Returns:

The instantiated instance or Optional.empty()

tryInstantiate

@Nonnull
public static <T> Optional<T> tryInstantiate(@Nonnull
                                                      Constructor<T> type,
                                                      Object... args)

Try to instantiate the given class.

Type Parameters:

T - The generic type

Parameters:

type - The type

args - The arguments to the constructor

Returns:

The instantiated instance or Optional.empty()

instantiate

public static <T> T instantiate(Class<T> type)

Instantiate the given class rethrowing any exceptions as InstantiationException.

Type Parameters:

T - The generic type

Parameters:

type - The type

Returns:

The instantiated instance

Throws:

InstantiationException - When an error occurs

instantiate

public static Object instantiate(String type,
                                 ClassLoader classLoader)

Instantiate the given class rethrowing any exceptions as InstantiationException.

Parameters:

type - The type

classLoader - The classloader

Returns:

The instantiated instance

Throws:

InstantiationException - When an error occurs

instantiate

public static <T> T instantiate(String type,
                                Class<T> requiredType)

Instantiate the given class rethrowing any exceptions as InstantiationException.

Type Parameters:

T - The type

Parameters:

type - The type

requiredType - The required type

Returns:

The instantiated instance

Throws:

InstantiationException - When an error occurs