1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | package org.apache.hadoop.fs; |
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19 | |
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20 | import java.util.Arrays; |
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21 | |
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22 | import org.apache.hadoop.io.Writable; |
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23 | |
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24 | /** An abstract class representing file checksums for files. */ |
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25 | public abstract class FileChecksum implements Writable { |
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26 | /** The checksum algorithm name */ |
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27 | public abstract String getAlgorithmName(); |
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28 | |
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29 | /** The length of the checksum in bytes */ |
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30 | public abstract int getLength(); |
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31 | |
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32 | /** The value of the checksum in bytes */ |
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33 | public abstract byte[] getBytes(); |
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34 | |
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35 | /** Return true if both the algorithms and the values are the same. */ |
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36 | public boolean equals(Object other) { |
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37 | if (other == this) { |
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38 | return true; |
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39 | } |
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40 | if (other == null || !(other instanceof FileChecksum)) { |
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41 | return false; |
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42 | } |
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43 | |
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44 | final FileChecksum that = (FileChecksum)other; |
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45 | return this.getAlgorithmName().equals(that.getAlgorithmName()) |
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46 | && Arrays.equals(this.getBytes(), that.getBytes()); |
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47 | } |
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48 | |
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49 | /** {@inheritDoc} */ |
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50 | public int hashCode() { |
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51 | return getAlgorithmName().hashCode() ^ Arrays.hashCode(getBytes()); |
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52 | } |
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53 | } |
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