hadoop CompositeCrcFileChecksum 源码
haddop CompositeCrcFileChecksum 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CompositeCrcFileChecksum.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;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.util.CrcUtil;
import org.apache.hadoop.util.DataChecksum;
/** Composite CRC. */
@InterfaceAudience.LimitedPrivate({"HDFS"})
@InterfaceStability.Unstable
public class CompositeCrcFileChecksum extends FileChecksum {
public static final int LENGTH = Integer.SIZE / Byte.SIZE;
private int crc;
private DataChecksum.Type crcType;
private int bytesPerCrc;
/**
* Create a CompositeCrcFileChecksum.
*
* @param crc crc.
* @param crcType crcType.
* @param bytesPerCrc bytesPerCrc.
*/
public CompositeCrcFileChecksum(
int crc, DataChecksum.Type crcType, int bytesPerCrc) {
this.crc = crc;
this.crcType = crcType;
this.bytesPerCrc = bytesPerCrc;
}
@Override
public String getAlgorithmName() {
return "COMPOSITE-" + crcType.name();
}
@Override
public int getLength() {
return LENGTH;
}
@Override
public byte[] getBytes() {
return CrcUtil.intToBytes(crc);
}
@Override
public ChecksumOpt getChecksumOpt() {
return new ChecksumOpt(crcType, bytesPerCrc);
}
@Override
public void readFields(DataInput in) throws IOException {
crc = in.readInt();
}
@Override
public void write(DataOutput out) throws IOException {
out.writeInt(crc);
}
@Override
public String toString() {
return getAlgorithmName() + ":" + String.format("0x%08x", crc);
}
}
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