ReflectionExecutor.java Source code

Introduction

Here is the source code for ReflectionExecutor.java

Source

/*
 * Copyright 2008-2009 the T2 Project ant the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package org.t2framework.commons.util;

import java.lang.reflect.InvocationTargetException;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

//import org.t2framework.commons.exception.ReflectionRuntimeException;

/**
 * 
 * @author shot
 * 
 */
public class ReflectionExecutor {
    /**
     * Execution of reflection with {@link ReflectionAction}.
     * 
     * @param <T>
     * @param action
     * @return
     */
    public static <T> T doSafeAction(final ReflectionAction<T> action) {
        final SecurityManager securityManager = System.getSecurityManager();
        if (securityManager == null) {
            try {
                return action.run();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        try {
            return AccessController.doPrivileged(new PrivilegedExceptionAction<T>() {

                @Override
                public T run() throws Exception {
                    return action.run();
                }

            });
        } catch (PrivilegedActionException e) {
            Throwable cause = e.getCause();
            if (InvocationTargetException.class.isInstance(cause)) {
                InvocationTargetException e1 = (InvocationTargetException) cause;
                throw new Exception(e1.getTargetException());
            }
            throw new Exception(cause);
        }
    }

    /**
     * {@link ReflectionAction} interface is an executor for reflection.
     * 
     * @author shot
     * 
     * @param <T>
     */
    public static interface ReflectionAction<T> {

        T run() throws Exception;

    }
}