001/*
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.util;
020
021import java.util.Arrays;
022
023import org.apache.yetus.audience.InterfaceAudience;
024import org.apache.yetus.audience.InterfaceStability;
025
026/**
027 * This class encapsulates a byte array and overrides hashCode and equals so
028 * that it's identity is based on the data rather than the array instance.
029 */
030@InterfaceAudience.Private
031@InterfaceStability.Stable
032public class HashedBytes {
033
034  private final byte[] bytes;
035  private final int hashCode;
036
037  public HashedBytes(byte[] bytes) {
038    this.bytes = bytes;
039    hashCode = Bytes.hashCode(bytes);
040  }
041
042  public byte[] getBytes() {
043    return bytes;
044  }
045
046  @Override
047  public int hashCode() {
048    return hashCode;
049  }
050
051  @Override
052  public boolean equals(Object obj) {
053    if (this == obj)
054      return true;
055    if (obj == null || getClass() != obj.getClass())
056      return false;
057    HashedBytes other = (HashedBytes) obj;
058    return (hashCode == other.hashCode) && Arrays.equals(bytes, other.bytes);
059  }
060
061  @Override
062  public String toString() {
063    return Bytes.toStringBinary(bytes);
064  }
065}