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.security.auth;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  
  public enum SecurityProtocol {
      /** Un-authenticated, non-encrypted channel */
      PLAINTEXT(0, "PLAINTEXT"),
      /** SSL channel */
      SSL(1, "SSL"),
      /** SASL authenticated, non-encrypted channel */
      SASL_PLAINTEXT(2, "SASL_PLAINTEXT"),
      /** SASL authenticated, SSL channel */
      SASL_SSL(3, "SASL_SSL");
  
      private static final Map<Short, SecurityProtocol> CODE_TO_SECURITY_PROTOCOL;
      private static final List<String> NAMES;
  
      static {
          SecurityProtocol[] protocols = SecurityProtocol.values();
          List<String> names = new ArrayList<>(protocols.length);
          Map<Short, SecurityProtocol> codeToSecurityProtocol = new HashMap<>(protocols.length);
          for (SecurityProtocol proto : protocols) {
              codeToSecurityProtocol.put(proto.id, proto);
              names.add(proto.name);
          }
          CODE_TO_SECURITY_PROTOCOL = Collections.unmodifiableMap(codeToSecurityProtocol);
          NAMES = Collections.unmodifiableList(names);
      }
  
      /** The permanent and immutable id of a security protocol -- this can't change, and must match kafka.cluster.SecurityProtocol  */
      public final short id;
  
      /** Name of the security protocol. This may be used by client configuration. */
      public final String name;
  
      SecurityProtocol(int id, String name) {
          this.id = (short) id;
          this.name = name;
      }
  
      public static List<String> names() {
          return NAMES;
      }
  
      public static SecurityProtocol forId(short id) {
          return CODE_TO_SECURITY_PROTOCOL.get(id);
      }
  
      /** Case insensitive lookup by protocol name */
      public static SecurityProtocol forName(String name) {
          return SecurityProtocol.valueOf(name.toUpperCase(Locale.ROOT));
      }
  
  }
  