com.hydraql.common.row.RowKeyHashingGenerator Maven / Gradle / Ivy
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/*
* 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 com.hydraql.common.row;
import com.hydraql.common.util.DigestUtil;
import com.hydraql.common.util.StringUtil;
/**
* @author [email protected] 2024/8/10 23:40
*/
public class RowKeyHashingGenerator implements RowKeyGenerator {
private static final int DEFAULT_STEP = 4;
private static final String DELIMITER = "|";
private static final int HASHING_PREFIX_LENGTH = DEFAULT_STEP + DELIMITER.length();
@Override
public String apply(String originalRow) {
if (StringUtil.isBlank(originalRow)) {
return originalRow;
}
String md5Key = DigestUtil.md5Hex(originalRow);
long hashCode = Math.abs(md5Key.hashCode());
return String.valueOf(hashCode).substring(0, DEFAULT_STEP) + DELIMITER + originalRow;
}
@Override
public String recover(String generatedRow) {
if (StringUtil.isBlank(generatedRow)) {
return generatedRow;
}
if (generatedRow.length() <= HASHING_PREFIX_LENGTH) {
return generatedRow;
}
return generatedRow.substring(HASHING_PREFIX_LENGTH);
}
@Override
public boolean isDefault() {
return false;
}
}