com.github.dm.jrt.util

Class Reflection

java.lang.Object

com.github.dm.jrt.util.Reflection

public class Reflection
extends Object

Reflection utility class.

Created by davide-maestroni on 09/09/2014.

Field Summary

Fields

Modifier and Type	Field and Description
static Object[]	NO_ARGS Constant defining an empty argument array for methods or constructors.

Method Summary

Methods

Modifier and Type	Method and Description
static Object[]	asArgs(Object... args) Returns the specified objects as an array of arguments.
static Class<?>	boxingClass(Class<?> type) Returns the class boxing the specified primitive type.
static <TYPE> Constructor<TYPE>	findConstructor(Class<TYPE> type, Object... args) Finds the constructor of the specified class best matching the passed arguments.
static Method	findMethod(Class<?> type, String name, Class<?>... parameterTypes) Finds the method matching the specified parameters.
static boolean	hasStaticContext(Class<?> type) Checks if the specified class is static or is a top level class.
static Constructor<?>	makeAccessible(Constructor<?> constructor) Makes the specified constructor accessible.
static Method	makeAccessible(Method method) Makes the specified method accessible.

Methods inherited from class java.lang.Object

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

Field Detail

NO_ARGS

public static final Object[] NO_ARGS

Constant defining an empty argument array for methods or constructors.

Method Detail

asArgs

@NotNull
public static Object[] asArgs(@Nullable
                      Object... args)

Returns the specified objects as an array of arguments.

Parameters:

args - the argument objects.

Returns:

the array.

boxingClass

@NotNull
public static Class<?> boxingClass(@NotNull
                           Class<?> type)

Returns the class boxing the specified primitive type.

If the passed class does not represent a primitive type the same class is returned.

Parameters:

type - the primitive type.

Returns:

the boxing class.

findConstructor

@NotNull
public static <TYPE> Constructor<TYPE> findConstructor(@NotNull
                                               Class<TYPE> type,
                                               @NotNull
                                               Object... args)

Finds the constructor of the specified class best matching the passed arguments.

Note that clashing of signature is automatically avoided, since constructors are not identified by their name. Hence the best match will be always unique in the class.

Type Parameters:

TYPE - the target type.

Parameters:

type - the target class.

args - the constructor arguments.

Returns:

the best matching constructor.

Throws:

IllegalArgumentException - if no constructor taking the specified objects as parameters was found.

findMethod

@NotNull
public static Method findMethod(@NotNull
                        Class<?> type,
                        @NotNull
                        String name,
                        @NotNull
                        Class<?>... parameterTypes)

Finds the method matching the specified parameters.

Note that the returned method may not be accessible.

Parameters:

type - the target class.

name - the method name.

parameterTypes - the method parameter types.

Returns:

the matching method.

Throws:

IllegalArgumentException - if no method matching the specified parameters was found.

hasStaticContext

public static boolean hasStaticContext(@NotNull
                       Class<?> type)

Checks if the specified class is static or is a top level class.

Parameters:

type - the class.

Returns:

whether the class has a static context.

makeAccessible

@NotNull
public static Constructor<?> makeAccessible(@NotNull
                                    Constructor<?> constructor)

Makes the specified constructor accessible.

Parameters:

constructor - the constructor instance.

Returns:

the constructor.

makeAccessible

@NotNull
public static Method makeAccessible(@NotNull
                            Method method)

Makes the specified method accessible.

Parameters:

method - the method instance.

Returns:

the method.