Java Method Call invoke(Class targetClass, Object target, String methodName, Class paramType0, Object paramValue0)

Description

call method by reflection this method allows to call protected and private methods; use it with care...

License

Open Source License

Parameter

Parameter	Description
targetClass	a parameter
target	a parameter
methodName	a parameter
paramType0	a parameter
paramValue0	a parameter

Exception

Parameter	Description
NoSuchMethodException	an exception
IllegalAccessException	an exception
InvocationTargetException	an exception

Declaration

public static Object invoke(Class targetClass, Object target, String methodName, Class paramType0,
        Object paramValue0) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException 

Method Source Code

//package com.java2s;
/*//from  w w  w  .java  2s. co m
 * This file is part of the Jose Project
 * see http://jose-chess.sourceforge.net/
 * (c) 2002-2006 Peter Sch?fer
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {
    /**
     * call method by reflection
     * this method allows to call protected and private methods; use it with care...
     *
     * @param targetClass
     * @param target
     * @param methodName
     * @param paramType0
     * @param paramValue0
     * @return
     * @throws NoSuchMethodException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static Object invoke(Class targetClass, Object target, String methodName, Class paramType0,
            Object paramValue0) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        Class[] paramTypes = new Class[1];
        Object[] paramValues = new Object[1];
        paramTypes[0] = paramType0;
        paramValues[0] = paramValue0;
        return invoke(targetClass, target, methodName, paramTypes, paramValues);
    }

    public static Object invoke(String targetClassName, Object target, String methodName, Class paramType0,
            Object paramValue0) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
            ClassNotFoundException {
        Class targetClass = Class.forName(targetClassName);
        return invoke(targetClass, target, methodName, paramType0, paramValue0);
    }

    public static Object invoke(Class targetClass, Object target, String methodName, Class paramType0,
            Object paramValue0, Class paramType1, Object paramValue1)
            throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        Class[] paramTypes = new Class[2];
        Object[] paramValues = new Object[2];
        paramTypes[0] = paramType0;
        paramValues[0] = paramValue0;
        paramTypes[1] = paramType1;
        paramValues[1] = paramValue1;
        return invoke(targetClass, target, methodName, paramTypes, paramValues);
    }

    public static Object invoke(Object target, String methodName, Class paramType0, Object paramValue0)
            throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        return invoke(target.getClass(), target, methodName, paramType0, paramValue0);
    }

    public static Object invoke(String targetClassName, Object target, String methodName, Class paramType0,
            Object paramValue0, Class paramType1, Object paramValue1) throws NoSuchMethodException,
            IllegalAccessException, InvocationTargetException, ClassNotFoundException {
        Class targetClass = Class.forName(targetClassName);
        return invoke(targetClass, target, methodName, paramType0, paramValue0, paramType1, paramValue1);
    }

    public static Object invoke(Object target, String methodName, Class[] paramTypes, Object[] paramValues)
            throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        return invoke(target.getClass(), target, methodName, paramTypes, paramValues);
    }

    public static Object invoke(Object target, String methodName)
            throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        return invoke(target.getClass(), target, methodName, (Class[]) null, (Object[]) null);
    }

    public static Object invoke(Class targetClass, Object target, String methodName, Class[] paramTypes,
            Object[] paramValues) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        Method method = getMethod(targetClass, methodName, paramTypes);
        method.setAccessible(true);
        return method.invoke(target, paramValues);
    }

    public static Object invoke(String targetClassName, Object target, String methodName, Class[] paramTypes,
            Object[] paramValues) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
            ClassNotFoundException {
        Class targetClass = Class.forName(targetClassName);
        return invoke(targetClass, target, methodName, paramTypes, paramValues);
    }

    public static Method getMethod(Class targetClass, String methodName, Class[] paramTypes)
            throws NoSuchMethodException {
        Method method = null;
        NoSuchMethodException nsmex = null;
        for (Class clazz = targetClass; clazz != null; clazz = clazz.getSuperclass())
            try {
                method = clazz.getDeclaredMethod(methodName, paramTypes);
                break;
            } catch (NoSuchMethodException ex) {
                if (nsmex == null)
                    nsmex = ex;
                continue;
            }

        if (method == null && nsmex != null)
            throw nsmex;
        else
            return method;
    }
}

Related

1. invoke(@Nonnull Object source, @Nonnull String name, Object... args)
2. invoke(boolean makeAccessible, T object, Class methodClass, String methodName, Class[] paramTypes, Object... params)
3. invoke(Class c, Object obj, String method, Class[] paramClasses, Object[] params)
4. invoke(Class annotationClass, Object instance, Object[] parameters)
5. invoke(Class clazz, Object obj, String methodName, Object... args)
6. invoke(Class clazz, String methodName, Class[] parameterTypes, Object instance, Object[] args, Class returnType)
7. invoke(Class clazz, String methodName, Object instance, Class[] signature, Object... args)