content: /*
   * Created on Dec 21, 2009
   *
   * 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.
   *
   * Copyright @2009-2013 the original author or authors.
   */
  package org.fest.swing.security;
  
  import javax.annotation.Nonnull;
  
  /**
   * Installs/uninstalls a {@link NoExitSecurityManager}.
   *
   * @author Alex Ruiz
   */
  public class NoExitSecurityManagerInstaller {
    /**
     * Installs a new {@link NoExitSecurityManager} in {@code System}.
     *
     * @return this installer.
     */
    public static @Nonnull NoExitSecurityManagerInstaller installNoExitSecurityManager() {
      return new NoExitSecurityManagerInstaller(new NoExitSecurityManager());
    }
  
    /**
     * Installs a new {@link NoExitSecurityManager} in {@code System}.
     *
     * @param hook gets notified when an application tries to terminate the current JVM.
     * @return this installer.
     * @throws NullPointerException if the given hook is {@code null}.
     */
    public static @Nonnull NoExitSecurityManagerInstaller installNoExitSecurityManager(@Nonnull ExitCallHook hook) {
      return new NoExitSecurityManagerInstaller(new NoExitSecurityManager(hook));
    }
  
    private final SecurityManager oldManager;
  
    private NoExitSecurityManagerInstaller(@Nonnull NoExitSecurityManager newManager) {
      oldManager = System.getSecurityManager();
      System.setSecurityManager(newManager);
    }
  
    /**
     * Uninstalls the {@link NoExitSecurityManager} installed by {@link #installNoExitSecurityManager()}, restoring the
     * original {@code SecurityManager}.
     */
    public void uninstall() {
      System.setSecurityManager(oldManager);
    }
  }
  