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 com.aliyun.oss.model;
  
  /**
   * Server-side Encryption Algorithm.
   */
  public enum SSEAlgorithm {
      AES256("AES256"),
      KMS("KMS"),
      SM4("SM4"),
      ;
  
      private final String algorithm;
  
      public String getAlgorithm() {
          return algorithm;
      }
  
      private SSEAlgorithm(String algorithm) {
          this.algorithm = algorithm;
      }
  
      @Override
      public String toString() {
          return algorithm;
      }
  
      /**
       * Returns the SSEAlgorithm enum corresponding to the given string;
       * or null if and only if the given algorithm is null.
       *
       * @param algorithm
       *            The encryption algorithm.
       *
       * @return  The {@link SSEAlgorithm} enum.
       *
       * @throws IllegalArgumentException if the specified algorithm is not
       * supported.
       */
      public static SSEAlgorithm fromString(String algorithm) {
          if (algorithm == null)
              return null;
          for (SSEAlgorithm e: values()) {
              if (e.getAlgorithm().equals(algorithm))
                  return e;
          }
          throw new IllegalArgumentException("Unsupported algorithm " + algorithm);
      }
  
      /**
       * Gets the default server side encryption algorithm, which is AES256.
       * @return The {@link SSEAlgorithm} enum.
       */
      public static SSEAlgorithm getDefault() {
          return AES256;
      }
      
  }
  
  