net.automatalib.commons.util

Class ReflectUtil

java.lang.Object

net.automatalib.commons.util.ReflectUtil

public final class ReflectUtil
extends Object

Utility methods for using Java reflection.

Author:

frohme, Malte Isberner

Method Summary

Modifier and Type	Method and Description
static <T> @Nullable Constructor<T>	findConstructor(Class<T> clazz, Class<?>... params) Tries to find a constructor that is able to accept parameters of the given types.
static @Nullable Method	findMatchingMethod(Class<?> clazz, String name, Object... args) See findMethod(Class, String, Class...).
static @Nullable Method	findMethod(Class<?> clazz, String name, Class<?>... params) Tries to find a method of the given name that is able to accept parameters of the given types.
static @Nullable Method	findMethodRT(Class<?> clazz, String name, @Nullable Class<?> returnType, Class<?>... params) See findMethod(Class, String, Class...).

Methods inherited from class java.lang.Object

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

Method Detail

findConstructor

public static <T> @Nullable Constructor<T> findConstructor(Class<T> clazz,
                                                           Class<?>... params)

Tries to find a constructor that is able to accept parameters of the given types. First tries to find the constructor matching the exact parameter types. If such a constructor does not exist, tries to find any (the first match of arbitrary order) constructor that is able to accept the parameter types by means of auto-boxing, i.e. a Constructor(int) would be returned for the parameters class Integer.class.

Returns null if no such constructor could be found.

Type Parameters:

T - the class type

Parameters:

clazz - the class which should be scanned for constructors

params - the types of the constructor arguments

Returns:

A constructor that is able of accepting parameters of the specified types, null if such a constructor could not be found.

findMethod

public static @Nullable Method findMethod(Class<?> clazz,
                                          String name,
                                          Class<?>... params)

Tries to find a method of the given name that is able to accept parameters of the given types. First tries to find the method matching the exact parameter types. If such a method does not exist, tries to find any (the first match of arbitrary order) method that is able to accept the parameter types by means of auto-boxing, i.e. a Method(int) would be returned for the parameters class Integer.class.

Returns null if no such method could be found.

Parameters:

clazz - the class which should be scanned for methods

name - the name of the method

params - the types of the method arguments

Returns:

A method that is able to accept parameters of the specified types, null if such a method could not be found.

findMatchingMethod

public static @Nullable Method findMatchingMethod(Class<?> clazz,
                                                  String name,
                                                  Object... args)

See findMethod(Class, String, Class...). This variation does not required the types of input parameters, but can handle the actual objects, which should be passed to the method.

Parameters:

clazz - the class which should be scanned for methods

name - the name of the method

args - the objects that should be passed to the method, may contain nulls

Returns:

A method that is able to accept of the specified objects, null if such a method could not be found.

findMethodRT

public static @Nullable Method findMethodRT(Class<?> clazz,
                                            String name,
                                            @Nullable Class<?> returnType,
                                            Class<?>... params)

See findMethod(Class, String, Class...). This variation allows to additionally narrow the method by specifying its return type.

Parameters:

clazz - the class which should be scanned for methods

name - the name of the method

returnType - the type of the returned object, if null, the return type will be ignored

params - the types of the method arguments

Returns:

A method that is able to accept of the specified objects, null if such a method could not be found.