Execution of reflection : Permission « Security « Java

1. Java
2. Security
3. Permission

Execution of reflection

        
/*
 * 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;

  }
}

   
    
    
    
    
    
    
    
  

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