com.cjcrafter.foliascheduler.util

Class MethodInvoker

java.lang.Object

com.cjcrafter.foliascheduler.util.MethodInvoker

public class MethodInvoker
extends java.lang.Object

Wraps a Method object from the Java Reflection API and provides methods to invoke the method without having to handle checked exceptions.

This class delegates methods to the underlying Method object, but wraps checked exceptions in RuntimeException to avoid having to handle them. All ReflectiveOperationException instances are caught and rethrown as RuntimeException. Other runtime exceptions are not caught and will be thrown as normal.

Constructor Summary

Constructors

Constructor and Description
MethodInvoker(@NotNull java.lang.reflect.Method method)

Method Summary

Modifier and Type	Method and Description
@NotNull java.lang.reflect.Method	getMethod() Returns the underlying Method object that this MethodInvoker wraps.
@Nullable java.lang.Object	invoke(@Nullable java.lang.Object obj, java.lang.Object... args) Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.

Methods inherited from class java.lang.Object

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

Constructor Detail

MethodInvoker

public MethodInvoker(@NotNull
                     @NotNull java.lang.reflect.Method method)

Method Detail

getMethod

@NotNull
public @NotNull java.lang.reflect.Method getMethod()

Returns the underlying Method object that this MethodInvoker wraps.

Returns:

the underlying Method object

invoke

@Nullable
public @Nullable java.lang.Object invoke(@Nullable
                                                   @Nullable java.lang.Object obj,
                                                   java.lang.Object... args)
                                            throws java.lang.IllegalArgumentException

Invokes the underlying method represented by this Method object, on the specified object with the specified parameters. Individual parameters are automatically unwrapped to match primitive formal parameters, and both primitive and reference parameters are subject to method invocation conversions as necessary.

If the underlying method is static, then the specified obj argument is ignored. It may be null.

If the number of formal parameters required by the underlying method is 0, the supplied args array may be of length 0 or null.

If the underlying method is an instance method, it is invoked using dynamic method lookup as documented in The Java Language Specification, Second Edition, section 15.12.4.4; in particular, overriding based on the runtime type of the target object will occur.

If the underlying method is static, the class that declared the method is initialized if it has not already been initialized.

If the method completes normally, the value it returns is returned to the caller of invoke; if the value has a primitive type, it is first appropriately wrapped in an object. However, if the value has the type of an array of a primitive type, the elements of the array are not wrapped in objects; in other words, an array of primitive type is returned. If the underlying method return type is void, the invocation returns null.

Parameters:

obj - the object the underlying method is invoked from

args - the arguments used for the method call

Returns:

the result of dispatching the method represented by this object on obj with parameters args

Throws:

WrappedReflectiveOperationException - if this Method object is enforcing Java language access control and the underlying method is inaccessible.

java.lang.IllegalArgumentException - if the method is an instance method and the specified object argument is not an instance of the class or interface declaring the underlying method (or of a subclass or implementor thereof); if the number of actual and formal parameters differ; if an unwrapping conversion for primitive arguments fails; or if, after possible unwrapping, a parameter value cannot be converted to the corresponding formal parameter type by a method invocation conversion.

WrappedReflectiveOperationException - if the underlying method throws an exception.

java.lang.NullPointerException - if the specified object is null and the method is an instance method.

java.lang.ExceptionInInitializerError - if the initialization provoked by this method fails.