org.apache.hadoop.hive.ql.udf.generic.RoundUtils 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.hadoop.hive.ql.udf.generic;
import java.math.BigDecimal;
import java.math.RoundingMode;
import org.apache.hadoop.hive.common.type.HiveDecimal;
/**
* Utility class for generic round UDF.
*
*/
public class RoundUtils {
private RoundUtils() {
}
/**
* Rounding a double is approximate, as the double value itself is approximate.
* A double literal, such as 3.15, may not be represented internally exactly as
* 3.15. thus, the rounding value of it can be off on the surface. For accurate
* rounding, consider using decimal type.
*
* @param input input value
* @param scale decimal place
* @return rounded value
*/
public static double round(double input, int scale) {
if (Double.isNaN(input) || Double.isInfinite(input)) {
return input;
}
return BigDecimal.valueOf(input).setScale(scale, RoundingMode.HALF_UP).doubleValue();
}
public static long round(long input, int scale) {
return BigDecimal.valueOf(input).setScale(scale, RoundingMode.HALF_UP).longValue();
}
public static HiveDecimal round(HiveDecimal input, int scale) {
return input.setScale(scale, HiveDecimal.ROUND_HALF_UP);
}
}