Java Reflection Method Invoke invokeMethod(Method method, Object target, Class expectedType)

Description

Invoke method and check the result.

License

Open Source License

Parameter

Parameter	Description
method	the method
target	the target
expectedType	the expected type
T	the exact type

Exception

Parameter	Description
Exception	for any error

Return

invocation's result

Declaration

protected static <T> T invokeMethod(Method method, Object target, Class<T> expectedType) throws Exception 

Method Source Code

//package com.java2s;
/*//  www  .  j  a  v  a2 s .c o m
 * JBoss, Home of Professional Open Source.
 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.lang.reflect.Method;

public class Main {
    /**
     * Invoke method and check the result.
     *
     * @param method       the method
     * @param target       the target
     * @param expectedType the expected type
     * @param <T>          the exact type
     * @return invocation's result
     * @throws Exception for any error
     */
    protected static <T> T invokeMethod(Method method, Object target, Class<T> expectedType) throws Exception {
        Object result = method.invoke(target);
        if (!expectedType.isInstance(result)) {
            throw new IllegalArgumentException(
                    "Returned result must be instance of [" + expectedType.getName() + "]");
        }

        return expectedType.cast(result);
    }
}

Related

1. invokeMethod(Method method, Object object, Object... args)
2. invokeMethod(Method method, Object object, Object... arguments)
3. invokeMethod(Method method, Object target)
4. invokeMethod(Method method, Object target)
5. invokeMethod(Method method, Object target)
6. invokeMethod(Method method, Object target, Object... args)
7. invokeMethod(Method method, Object target, Object... args)
8. invokeMethod(Method method, Object target, Object... arguments)
9. invokeMethod(Method method, Object target, Object... params)