FileChecksum.java
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上传日期:2018-01-08
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文件大小:2k
- /**
- * 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.io.Writable;
- /** An abstract class representing file checksums for files. */
- 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());
- }
- }