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
   *
   *    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.apache.kafka.common.internals;
  
  import java.security.PrivilegedAction;
  import java.util.concurrent.Callable;
  import java.util.concurrent.CompletionException;
  
  import javax.security.auth.Subject;
  
  /**
   * This is a fallback strategy to use if no other strategies are available.
   * <p>This is used to improve control flow and provide detailed error messages in unusual situations.
   */
  class UnsupportedStrategy implements SecurityManagerCompatibility {
  
      private final Throwable e1;
      private final Throwable e2;
  
      UnsupportedStrategy(Throwable e1, Throwable e2) {
          this.e1 = e1;
          this.e2 = e2;
      }
  
      private UnsupportedOperationException createException(String message) {
          UnsupportedOperationException e = new UnsupportedOperationException(message);
          e.addSuppressed(e1);
          e.addSuppressed(e2);
          return e;
      }
  
      @Override
      public <T> T doPrivileged(PrivilegedAction<T> action) {
          throw createException("Unable to find suitable AccessController#doPrivileged implementation");
      }
  
      @Override
      public Subject current() {
          throw createException("Unable to find suitable Subject#getCurrent or Subject#current implementation");
      }
  
      @Override
      public <T> T callAs(Subject subject, Callable<T> action) throws CompletionException {
          throw createException("Unable to find suitable Subject#doAs or Subject#callAs implementation");
      }
  }
  