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.cassandra.sidecar.common.request.data;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Objects;
  
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import static org.apache.cassandra.sidecar.common.http.SidecarHttpHeaderNames.CONTENT_XXHASH32;
  import static org.apache.cassandra.sidecar.common.http.SidecarHttpHeaderNames.CONTENT_XXHASH32_SEED;
  
  /**
   * Implements the XXHash32 Digest
   */
  public class XXHash32Digest implements Digest
  {
      private final @NotNull String value;
      private final @Nullable String seedHex;
  
      /**
       * Constructs a new XXHashDigest with the provided XXHash {@code value}
       *
       * @param value the xxhash value
       */
      public XXHash32Digest(String value)
      {
          this(value, null);
      }
  
      /**
       * Constructs a new instance with the provided XXHash {@code value} and the {@code seed} value.
       *
       * @param value the xxhash value
       * @param seed  the seed
       */
      public XXHash32Digest(String value, int seed)
      {
          this(value, Integer.toHexString(seed));
      }
  
      /**
       * Constructs a new XXHashDigest with the provided XXHash {@code value} and the seed value represented as
       * a hexadecimal string
       *
       * @param value   the xxhash value
       * @param seedHex the value of the seed represented as a hexadecimal value
       */
      public XXHash32Digest(@NotNull String value, @Nullable String seedHex)
      {
          this.value = Objects.requireNonNull(value, "value is required");
          this.seedHex = seedHex;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String value()
      {
          return value;
      }
  
      /**
       * @return the optional seed in hexadecimal format
       */
      public @Nullable String seedHex()
      {
          return seedHex;
      }
  
      @Override
      public String algorithm()
      {
          return "XXHash32";
      }
  
      /**
       * @return XXHash headers for the digest
       */
      @Override
      public Map<String, String> headers()
      {
          Map<String, String> headers = new HashMap<>();
          headers.put(CONTENT_XXHASH32, value);
          if (seedHex != null)
          {
              headers.put(CONTENT_XXHASH32_SEED, seedHex);
          }
          return headers;
      }
  }
  