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1   /*
2    * Copyright 2021 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty5.handler.ssl;
17  
18  import io.netty5.util.internal.EmptyArrays;
19  
20  import java.util.Arrays;
21  
22  /**
23   * Represent the session ID used by an {@link OpenSslSession}.
24   */
25  final class OpenSslSessionId {
26  
27      private final byte[] id;
28      private final int hashCode;
29  
30      static final OpenSslSessionId NULL_ID = new OpenSslSessionId(EmptyArrays.EMPTY_BYTES);
31  
32      OpenSslSessionId(byte[] id) {
33          // We take ownership if the byte[] and so there is no need to clone it.
34          //noinspection AssignmentOrReturnOfFieldWithMutableType
35          this.id = id;
36          // cache the hashCode as the byte[] array will never change
37          hashCode = Arrays.hashCode(id);
38      }
39  
40      @Override
41      public boolean equals(Object o) {
42          if (this == o) {
43              return true;
44          }
45          if (!(o instanceof OpenSslSessionId)) {
46              return false;
47          }
48  
49          return Arrays.equals(id, ((OpenSslSessionId) o).id);
50      }
51  
52      @Override
53      public String toString() {
54          return "OpenSslSessionId{" +
55                  "id=" + Arrays.toString(id) +
56                  '}';
57      }
58  
59      @Override
60      public int hashCode() {
61          return hashCode;
62      }
63  
64      byte[] cloneBytes() {
65          return id.clone();
66      }
67  }