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   /*
    * Copyright 2021 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.handler.ssl;
  
  import io.netty.util.internal.EmptyArrays;
  
  import java.util.Arrays;
  
  /**
   * Represent the session ID used by an {@link OpenSslSession}.
   */
  final class OpenSslSessionId {
  
      private final byte[] id;
      private final int hashCode;
  
      static final OpenSslSessionId NULL_ID = new OpenSslSessionId(EmptyArrays.EMPTY_BYTES);
  
      OpenSslSessionId(byte[] id) {
          // We take ownership if the byte[] and so there is no need to clone it.
          this.id = id;
          // cache the hashCode as the byte[] array will never change
          this.hashCode = Arrays.hashCode(id);
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (!(o instanceof OpenSslSessionId)) {
              return false;
          }
  
          return Arrays.equals(id, ((OpenSslSessionId) o).id);
      }
  
      @Override
      public String toString() {
          return "OpenSslSessionId{" +
                  "id=" + Arrays.toString(id) +
                  '}';
      }
  
      @Override
      public int hashCode() {
          return hashCode;
      }
  
      byte[] cloneBytes() {
          return id.clone();
      }
  }