Class ReflectionUtils

java.lang.Object

com.thecsdev.common.util.ReflectionUtils

public final class ReflectionUtils
extends Object

Utility methods for java.lang.reflect.

Method Summary

Modifier and Type	Method	Description
static boolean	constructorMatchesArgs(Constructor<?> constructor, Object... args)	Compares a Constructor's parameter types against an Object array, checking if the arguments match the constructor.
static <T> T	createClassInstance(Class<T> type, Object... params)	Creates an instance of a Class using the first constructor that matches the given parameters.
static final @NotNull Field[]	getAllDeclaredFields(@Nullable Class<?> clazz)	Retrieves all declared Fields from the specified Class and its superclasses, up to (but not including) Object.
static boolean	isMethodOverridden(Class<?> topClass, String methodName, Class<?> returnType, Class<?>... paramTypes)	Checks if the given Class overrides a method with the specified signature.

Methods inherited from class Object

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

Method Details

getAllDeclaredFields

@NotNull
public static final @NotNull Field[] getAllDeclaredFields(@Nullable
 @Nullable Class<?> clazz)

Retrieves all declared Fields from the specified Class and its superclasses, up to (but not including) Object. This method ensures that no duplicate fields are included in the result.

Parameters:

clazz - The Class from which to retrieve Fields.

Returns:

An array of Field objects representing all declared fields in the Class hierarchy, without duplicates. The Fields also include private, protected, and package-private members of the classes.

constructorMatchesArgs

public static boolean constructorMatchesArgs(Constructor<?> constructor,
 Object... args)

Compares a Constructor's parameter types against an Object array, checking if the arguments match the constructor.

Parameters:

constructor - The Constructor to check.

args - The arguments for said Constructor.

Returns:

The result of the comparison. true if it's a match.

API Note:

Depends on Guava - com.google.*.

createClassInstance

public static <T> T createClassInstance(Class<T> type,
 Object... params)
                                 throws NullPointerException

Creates an instance of a Class using the first constructor that matches the given parameters. Pass no parameters to use a constructor that does not take any arguments. Non-primitive argument types may be assigned null.

The constructor must also be accessible. If a matching and accessible constructor cannot be found, null is returned.

Type Parameters:

T - The Class type.

Parameters:

type - The Class type.

params - The Class constructor parameters.

Throws:

NullPointerException - If an argument is null.

API Note:

Depends on Guava - com.google.*.

isMethodOverridden

@Experimental
public static boolean isMethodOverridden(Class<?> topClass,
 String methodName,
 Class<?> returnType,
 Class<?>... paramTypes)
                                  throws NullPointerException

Checks if the given Class overrides a method with the specified signature.

Parameters:

topClass - Class to start checking from.

methodName - Name of the method.

returnType - Expected return type.

paramTypes - Expected parameter types.

Returns:

true if the method is overridden in the Class hierarchy, false otherwise.

Throws:

NullPointerException - If an argument is null.

API Note:

This does not account for interfaces yet!