hadoop EtagChecksum 源码
haddop EtagChecksum 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/store/EtagChecksum.java
/*
* 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.store;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import org.apache.hadoop.fs.FileChecksum;
/**
* An etag as a checksum.
* Consider these suitable for checking if an object has changed, but
* not suitable for comparing two different objects for equivalence,
* especially between object stores.
*/
public class EtagChecksum extends FileChecksum {
/** The algorithm name: {@value}. */
private static final String ETAG = "etag";
/**
* Etag string.
*/
private String eTag = "";
/**
* Create with an empty etag.
*/
public EtagChecksum() {
}
/**
* Create with a string etag.
* @param eTag etag
*/
public EtagChecksum(String eTag) {
this.eTag = eTag;
}
@Override
public String getAlgorithmName() {
return ETAG;
}
@Override
public int getLength() {
return eTag.getBytes(StandardCharsets.UTF_8).length;
}
@Override
public byte[] getBytes() {
return eTag != null
? eTag.getBytes(StandardCharsets.UTF_8)
: new byte[0];
}
@Override
public void write(DataOutput out) throws IOException {
out.writeUTF(eTag != null ? eTag : "");
}
@Override
public void readFields(DataInput in) throws IOException {
eTag = in.readUTF();
}
@Override
public String toString() {
return "etag: \"" + eTag + '"';
}
}
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