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1   /*
2    * Copyright 2011 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.util;
21  
22  import java.util.Arrays;
23  
24  /**
25   * This class encapsulates a byte array and overrides hashCode and equals so
26   * that it's identity is based on the data rather than the array instance.
27   */
28  public class HashedBytes {
29  
30    private final byte[] bytes;
31    private final int hashCode;
32  
33    public HashedBytes(byte[] bytes) {
34      this.bytes = bytes;
35      hashCode = Bytes.hashCode(bytes);
36    }
37  
38    public byte[] getBytes() {
39      return bytes;
40    }
41  
42    @Override
43    public int hashCode() {
44      return hashCode;
45    }
46  
47    @Override
48    public boolean equals(Object obj) {
49      if (this == obj)
50        return true;
51      if (obj == null || getClass() != obj.getClass())
52        return false;
53      HashedBytes other = (HashedBytes) obj;
54      return Arrays.equals(bytes, other.bytes);
55    }
56  
57    @Override
58    public String toString() {
59      return Bytes.toStringBinary(bytes);
60    }
61  }