package org.apache.maven.shared.utils.cli;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.

  */

 import java.security.AccessControlException;

 /**

  * A shutdown hook that does not throw any exceptions upon container startup/shutdown or security manager

  * restrictions.

  *

  * Incorrect usage of the hook itself may still throw an exception.

  *

  * @author Kristian Rosenvold

  */

 class ShutdownHookUtils

 {

     public static void addShutDownHook( Thread hook )

     {

         try

         {

             Runtime.getRuntime().addShutdownHook( hook );

         }

         catch ( IllegalStateException ignore )

         {

             // ignore

         }

         catch ( AccessControlException ignore )

         {

             // ignore

         }

     }

     public static void removeShutdownHook( Thread hook )

     {

         try

         {

             Runtime.getRuntime().removeShutdownHook( hook );

         }

         catch ( IllegalStateException ignore )

         {

             // ignore

         }

         catch ( AccessControlException ignore )

         {

             // ignore

         }

     }

 }