Package io.jmix.core.common.util

Class ReflectionHelper

java.lang.Object

io.jmix.core.common.util.ReflectionHelper

public final class ReflectionHelper
extends Object

Utility class to simplify work with Java reflection.

Method Summary

Modifier and Type	Method	Description
static Field	findField(Class<?> concreteClass, String name)
static Method	findMethod(Class<?> c, String name, Object... params)	Searches for a method by its name and arguments.
static <T> Class<T>	getClass(String name)	Load class by name, wrapping a ClassNotFoundException into unchecked exception.
static Object	getFieldValue(Object entity, String property)	Useful to get real entity property value and avoid unfetched attribute exception.
static Class<?>[]	getParamTypes(Object... params)	Constructs an array of argument types from an array of actual values.
static <T> T	invokeMethod(Object obj, String name, Object... params)	Invokes a method by reflection.
static Class<?>	loadClass(String name)	Load class by name.
static <T> T	newInstance(Class<T> cls, Object... params)	Instantiates an object by appropriate constructor.

Methods inherited from class java.lang.Object

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

Method Details

loadClass

public static Class<?> loadClass(String name)
                          throws ClassNotFoundException

Load class by name.

Parameters:

name - class FQN or primitive type name

Returns:

class instance

Throws:

ClassNotFoundException - if not found

getClass

public static <T> Class<T> getClass(String name)

Load class by name, wrapping a ClassNotFoundException into unchecked exception.

Parameters:

name - class FQN

Returns:

class instance

newInstance

public static <T> T newInstance(Class<T> cls,
 Object... params)
                         throws NoSuchMethodException

Instantiates an object by appropriate constructor.

Parameters:

cls - class

params - constructor arguments

Returns:

created object instance

Throws:

NoSuchMethodException - if the class has no constructor matching the given arguments

findMethod

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

Searches for a method by its name and arguments.

Parameters:

c - class

name - method name

params - method arguments

Returns:

method reference or null if a suitable method not found

invokeMethod

public static <T> T invokeMethod(Object obj,
 String name,
 Object... params)
                          throws NoSuchMethodException

Invokes a method by reflection.

Parameters:

obj - object instance

name - method name

params - method arguments

Returns:

method result

Throws:

NoSuchMethodException - if a suitable method not found

getParamTypes

public static Class<?>[] getParamTypes(Object... params)

Constructs an array of argument types from an array of actual values. Values can not contain nulls.

Parameters:

params - arguments

Returns:

the array of argument types

getFieldValue

public static Object getFieldValue(Object entity,
 String property)

Useful to get real entity property value and avoid unfetched attribute exception.

Returns:

field value

findField

@Nullable
public static Field findField(Class<?> concreteClass,
 String name)