io.micronaut.core.reflect

Class GenericTypeUtils

java.lang.Object

io.micronaut.core.reflect.GenericTypeUtils

public class GenericTypeUtils
extends Object

Utility methods for dealing with generic types via reflection. Generally reflection is to be avoided in Micronaut. Hence this class is regarded as internal and used for only certain niche cases.

Since:

1.0

Author:

Graeme Rocher

Constructor Summary

Constructors

Constructor and Description
GenericTypeUtils()

Method Summary

Modifier and Type	Method and Description
static Optional<Class>	resolveGenericTypeArgument(Field field) Resolves a single generic type argument for the given field.
static Optional<Class>	resolveInterfaceTypeArgument(Class type, Class interfaceType) Resolves a single type argument from the given interface of the given class.
static Class[]	resolveInterfaceTypeArguments(Class<?> type, Class<?> interfaceType) Resolve all of the type arguments for the given interface from the given type.
static Optional<Class>	resolveSuperGenericTypeArgument(Class type) Resolves a single generic type argument from the super class of the given type.
static Class[]	resolveSuperTypeGenericArguments(Class<?> type, Class<?> superTypeToResolve) Resolve all of the type arguments for the given super type from the given type.
static Class[]	resolveTypeArguments(Type genericType) Resolves the type arguments for a generic type.

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericTypeUtils

public GenericTypeUtils()

Method Detail

resolveGenericTypeArgument

public static Optional<Class> resolveGenericTypeArgument(Field field)

Resolves a single generic type argument for the given field.

Parameters:

field - The field

Returns:

The type argument or Optional.empty()

resolveInterfaceTypeArguments

public static Class[] resolveInterfaceTypeArguments(Class<?> type,
                                                    Class<?> interfaceType)

Resolve all of the type arguments for the given interface from the given type. Also searches superclasses.

Parameters:

type - The type to resolve from

interfaceType - The interface to resolve from

Returns:

The type arguments to the interface

resolveSuperTypeGenericArguments

public static Class[] resolveSuperTypeGenericArguments(Class<?> type,
                                                       Class<?> superTypeToResolve)

Resolve all of the type arguments for the given super type from the given type.

Parameters:

type - The type to resolve from

superTypeToResolve - The suepr type to resolve from

Returns:

The type arguments to the interface

resolveSuperGenericTypeArgument

public static Optional<Class> resolveSuperGenericTypeArgument(Class type)

Resolves a single generic type argument from the super class of the given type.

Parameters:

type - The type to resolve from

Returns:

A single Class or null

resolveTypeArguments

public static Class[] resolveTypeArguments(Type genericType)

Resolves the type arguments for a generic type.

Parameters:

genericType - The generic type

Returns:

The type arguments

resolveInterfaceTypeArgument

public static Optional<Class> resolveInterfaceTypeArgument(Class type,
                                                           Class interfaceType)

Resolves a single type argument from the given interface of the given class. Also searches superclasses.

Parameters:

type - The type to resolve from

interfaceType - The interface to resolve for

Returns:

The class or null