com.helger.commons.lang.priviledged.IPrivilegedAction Maven / Gradle / Ivy

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/**
 * Copyright (C) 2014-2019 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 com.helger.commons.lang.priviledged;

import java.net.Authenticator;
import java.net.ProxySelector;
import java.security.PrivilegedAction;
import java.util.Properties;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.helger.commons.ValueEnforcer;

/**
 * Extension to {@link PrivilegedAction} with an {@link #invokeSafe()} method
 * that invokes the {@link java.security.AccessController} only if a security
 * manager is present.
 *
 * @author Philip Helger
 * @param 
 *        The action return type.
 */
@FunctionalInterface
public interface IPrivilegedAction  extends PrivilegedAction 
{
  /**
   * @return The result of {@link #run()} dependent if a system manager is
   *         installed or not.
   */
  @Nullable
  default T invokeSafe ()
  {
    if (System.getSecurityManager () == null)
    {
      // No need to use AccessController
      return run ();
    }
    return AccessControllerHelper.call (this);
  }

  @Nonnull
  static IPrivilegedAction