| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.fs; |
| |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.Writable; |
| |
| /** An abstract class representing file checksums for files. */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public abstract class FileChecksum implements Writable { |
| /** The checksum algorithm name */ |
| public abstract String getAlgorithmName(); |
| |
| /** The length of the checksum in bytes */ |
| public abstract int getLength(); |
| |
| /** The value of the checksum in bytes */ |
| public abstract byte[] getBytes(); |
| |
| /** Return true if both the algorithms and the values are the same. */ |
| public boolean equals(Object other) { |
| if (other == this) { |
| return true; |
| } |
| if (other == null || !(other instanceof FileChecksum)) { |
| return false; |
| } |
| |
| final FileChecksum that = (FileChecksum)other; |
| return this.getAlgorithmName().equals(that.getAlgorithmName()) |
| && Arrays.equals(this.getBytes(), that.getBytes()); |
| } |
| |
| /** {@inheritDoc} */ |
| public int hashCode() { |
| return getAlgorithmName().hashCode() ^ Arrays.hashCode(getBytes()); |
| } |
| } |