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.ambari.server.serveraction.kerberos;
  
  import com.google.inject.Inject;
  import com.google.inject.Injector;
  import com.google.inject.Singleton;
  
  /**
   * KerberosOperationHandlerFactory gets relevant KerberosOperationHandlers given a KDCType.
   */
  @Singleton
  public class KerberosOperationHandlerFactory {
  
    @Inject
    private Injector injector;
  
    /**
     * Gets the relevant KerberosOperationHandler for some KDCType.
     * <p/>
     * If no KDCType is specified, {@link org.apache.ambari.server.serveraction.kerberos.KDCType#MIT_KDC}
     * will be assumed.
     *
     * @param kdcType the relevant KDCType
     * @return a KerberosOperationHandler
     * @throws java.lang.IllegalArgumentException if kdcType is null or the KDCType is an unexpected value
     */
    public KerberosOperationHandler getKerberosOperationHandler(KDCType kdcType) {
      if (kdcType == null) {
        throw new IllegalArgumentException("kdcType may not be null");
      }
  
      switch (kdcType) {
        case MIT_KDC:
          return injector.getInstance(MITKerberosOperationHandler.class);
        case ACTIVE_DIRECTORY:
          return injector.getInstance(ADKerberosOperationHandler.class);
        case IPA:
          return injector.getInstance(IPAKerberosOperationHandler.class);
        default:
          throw new IllegalArgumentException(String.format("Unexpected kdcType value: %s", kdcType.name()));
      }
    }
  }
  