io.jmix.core.common.util

Class ReflectionHelper

java.lang.Object

io.jmix.core.common.util.ReflectionHelper

public final class ReflectionHelper
extends java.lang.Object

Utility class to simplify work with Java reflection.

Method Summary

Modifier and Type	Method and Description
static java.lang.reflect.Method	findMethod(java.lang.Class<?> c, java.lang.String name, java.lang.Object... params) Searches for a method by its name and arguments.
static <T> java.lang.Class<T>	getClass(java.lang.String name) Load class by name, wrapping a ClassNotFoundException into unchecked exception.
static java.lang.Class[]	getParamTypes(java.lang.Object... params) Constructs an array of argument types from an array of actual values.
static <T> T	invokeMethod(java.lang.Object obj, java.lang.String name, java.lang.Object... params) Invokes a method by reflection.
static java.lang.Class<?>	loadClass(java.lang.String name) Load class by name.
static <T> T	newInstance(java.lang.Class<T> cls, java.lang.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 Detail

loadClass

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

Load class by name.

Parameters:

name - class FQN or primitive type name

Returns:

class instance

Throws:

java.lang.ClassNotFoundException - if not found

getClass

public static <T> java.lang.Class<T> getClass(java.lang.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(java.lang.Class<T> cls,
                                java.lang.Object... params)
                         throws java.lang.NoSuchMethodException

Instantiates an object by appropriate constructor.

Parameters:

cls - class

params - constructor arguments

Returns:

created object instance

Throws:

java.lang.NoSuchMethodException - if the class has no constructor matching the given arguments

findMethod

@Nullable
public static java.lang.reflect.Method findMethod(java.lang.Class<?> c,
                                                            java.lang.String name,
                                                            java.lang.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(java.lang.Object obj,
                                 java.lang.String name,
                                 java.lang.Object... params)
                          throws java.lang.NoSuchMethodException

Invokes a method by reflection.

Parameters:

obj - object instance

name - method name

params - method arguments

Returns:

method result

Throws:

java.lang.NoSuchMethodException - if a suitable method not found

getParamTypes

public static java.lang.Class[] getParamTypes(java.lang.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