org.apache.hudi.common.util.NumericUtils Maven / Gradle / Ivy
/*
* 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.hudi.common.util;
import org.apache.hudi.exception.HoodieException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Objects;
/**
* A utility class for numeric.
*/
public class NumericUtils {
public static String humanReadableByteCount(double bytes) {
if (bytes < 1024) {
return String.format("%.1f B", bytes);
}
int exp = (int) (Math.log(bytes) / Math.log(1024));
String pre = "KMGTPE".charAt(exp - 1) + "";
return String.format("%.1f %sB", bytes / Math.pow(1024, exp), pre);
}
public static long getMessageDigestHash(final String algorithmName, final String string) {
MessageDigest md;
try {
md = MessageDigest.getInstance(algorithmName);
} catch (NoSuchAlgorithmException e) {
throw new HoodieException(e);
}
return asLong(Objects.requireNonNull(md).digest(string.getBytes(StandardCharsets.UTF_8)));
}
public static long asLong(byte[] bytes) {
ValidationUtils.checkState(bytes.length >= 8, "HashCode#asLong() requires >= 8 bytes.");
return padToLong(bytes);
}
public static long padToLong(byte[] bytes) {
long retVal = (bytes[0] & 0xFF);
for (int i = 1; i < Math.min(bytes.length, 8); i++) {
retVal |= (bytes[i] & 0xFFL) << (i * 8);
}
return retVal;
}
}