[120] | 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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