content: /*
   *  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
   *
   *      https://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.apache.tools.ant.util.optional;
  
  import java.security.Permission;
  
  import org.apache.tools.ant.ExitException;
  
  /**
   * This is intended as a replacement for the default system manager.
   * The goal is to intercept System.exit calls and make it throw an
   * exception instead so that a System.exit in a task does not
   * fully terminate Ant.
   * <p>
   * This class is no longer supported in Java runtime versions 18 and higher.
   *
   * @see ExitException
   */
  public class NoExitSecurityManager extends SecurityManager {
  
      /**
       * Override SecurityManager#checkExit.
       * This throws an ExitException(status) exception.
       * @param status the exit status
       */
      @Override
      public void checkExit(int status) {
          throw new ExitException(status);
      }
  
      /**
       * Override SecurityManager#checkPermission.
       * This does nothing.
       * @param perm the requested permission.
       */
      @Override
      public void checkPermission(Permission perm) {
          // no permission here
      }
  }
  