siujamo
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/*
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* Copyright (C) 2024-2025 OnixByte.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
|
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* You may obtain a copy of the License at
|
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*
|
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
|
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* distributed under the License is distributed on an "AS IS" BASIS,
|
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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* See the License for the specific language governing permissions and
|
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* limitations under the License.
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*/
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package com.onixbyte.nums;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.util.Objects;
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import java.util.function.BiFunction;
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import java.util.function.Function;
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/**
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* The {@code ChainedCalcUtil} class provides a convenient way to perform chained high-precision
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* calculations using {@link BigDecimal}. It allows users to perform mathematical operations such
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* as addition, subtraction, multiplication, and division with customisable precision and scale.
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* By using this utility class, developers can achieve accurate results and avoid precision loss
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* in their calculations.
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* <p>
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* <b>Usage:</b>
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* <pre>
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* // Perform addition: 3 + 4
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* BigDecimal result1 = ChainedCalcUtil.startWith(3)
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* .add(4)
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* .getValue();
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*
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* // Perform subtraction: 4 - 2
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* BigDecimal result2 = ChainedCalcUtil.startWith(4)
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* .subtract(2)
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* .getValue();
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*
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* // Perform multiplication: 3 * 6
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* BigDecimal result3 = ChainedCalcUtil.startWith(3)
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* .multiply(6)
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* .getValue();
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*
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* // Perform division: 6 ÷ 2
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* BigDecimal result4 = ChainedCalcUtil.startWith(6)
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* .divide(2)
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* .getValue();
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*
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* // Perform division with specified scale: 13 ÷ 7 with a scale of 2
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* BigDecimal result5 = ChainedCalcUtil.startWith(13)
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* .divideWithScale(7, 2)
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* .getValue();
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*
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* // Get int, long, or double results
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* int intResult = ChainedCalcUtil.startWith(3)
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* .add(4)
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* .getInteger();
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*
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* long longResult = ChainedCalcUtil.startWith(4)
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* .subtract(2)
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* .getLong();
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*
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* double doubleResult = ChainedCalcUtil.startWith(6)
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* .divide(2)
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* .getDouble();
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*
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* // Get BigDecimal result with specified scale
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* BigDecimal result6 = ChainedCalcUtil.startWith(13)
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* .divide(7)
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* .getValue(2);
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* </pre>
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* The above expressions perform various mathematical calculations using the
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* {@code ChainedCalcUtil} class.
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* <p>
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* <b>Note:</b>
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* The {@code ChainedCalcUtil} class internally uses {@link BigDecimal} to handle high-precision
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* calculations. It is important to note that {@link BigDecimal} operations can be memory-intensive
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* and may have performance implications for extremely large numbers or complex calculations.
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*
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* @author sunzsh
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* @version 1.1.0
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* @see BigDecimal
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* @since 1.0.0
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*/
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public final class ChainedCalcUtil {
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private final static Logger log = LoggerFactory.getLogger(ChainedCalcUtil.class);
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/**
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* Creates a {@code ChainedCalcUtil} instance with the specified initial value.
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*
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* @param value the initial value for the calculation
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*/
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private ChainedCalcUtil(Number value) {
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this.value = convertBigDecimal(value, null);
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}
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/**
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* Starts a chained calculation with the specified initial value.
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*
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* @param value the initial value for the calculation
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* @return a {@code ChainedCalcUtil} instance for performing chained calculations
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*/
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public static ChainedCalcUtil startWith(Number value) {
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return new ChainedCalcUtil(value);
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}
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/**
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* Adds the specified value to the current value.
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*
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* @param other the value to be added
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil add(Number other) {
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return operator(BigDecimal::add, other);
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}
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/**
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* Adds the specified value to the current value with a specified scale before the operation.
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*
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* @param other the value to be added
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* @param beforeOperateScale the scale to be applied before the operation
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil add(Number other, Integer beforeOperateScale) {
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return operator(BigDecimal::add, other, beforeOperateScale);
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}
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/**
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* Subtracts the specified value from the current value.
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*
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* @param other the value to be subtracted
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil subtract(Number other) {
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return operator(BigDecimal::subtract, other);
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}
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/**
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* Subtracts the specified value from the current value with a specified scale before
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* the operation.
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*
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* @param other the value to be subtracted
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* @param beforeOperateScale the scale to be applied before the operation
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil subtract(Number other, Integer beforeOperateScale) {
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return operator(BigDecimal::subtract, other, beforeOperateScale);
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}
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/**
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* Multiplies the current value by the specified value.
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*
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* @param other the value to be multiplied by
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil multiply(Number other) {
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return operator(BigDecimal::multiply, other);
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}
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/**
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* Multiplies the current value by the specified value with a specified scale before
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* the operation.
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*
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* @param other the value to be multiplied by
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* @param beforeOperateScale the scale to be applied before the operation
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil multiply(Number other, Integer beforeOperateScale) {
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return operator(BigDecimal::multiply, other, beforeOperateScale);
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}
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/**
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* Divides the current value by the specified value.
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*
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* @param other the value to divide by
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil divide(Number other) {
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return operator(BigDecimal::divide, other);
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}
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/**
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* Divides the current value by the specified value with a specified scale before the operation.
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*
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* @param other the value to divide by
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* @param beforeOperateScale the scale to be applied before the operation
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil divide(Number other, Integer beforeOperateScale) {
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return operator(BigDecimal::divide, other, beforeOperateScale);
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}
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/**
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* Divides the current value by the specified value with a specified scale.
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*
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* @param other the value to divide by
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* @param scale the scale for the result
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil divideWithScale(Number other, Integer scale) {
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return baseOperator(otherValue ->
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this.value.divide(otherValue, scale, RoundingMode.HALF_UP), other, null);
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}
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/**
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* Divides the current value by the specified value with a specified scale and a scale applied
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* before the operation.
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*
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* @param other the value to divide by
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* @param scale the scale for the result
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* @param beforeOperateScale the scale to be applied before the operation
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* @return a {@code ChainedCalcUtil} instance with the updated value
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*/
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public ChainedCalcUtil divideWithScale(Number other, Integer scale, Integer beforeOperateScale) {
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return baseOperator((otherValue) ->
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this.value.divide(otherValue, scale, RoundingMode.HALF_UP),
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other, beforeOperateScale);
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}
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/**
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* Returns the current value as a {@link BigDecimal} with the specified scale.
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*
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* @param scale the scale for the result
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* @return the current value as a {@link BigDecimal} with the specified scale
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*/
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public BigDecimal getValue(int scale) {
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return value.setScale(scale, RoundingMode.HALF_UP);
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}
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/**
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* Returns the current value as a {@link BigDecimal}.
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*
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* @return the current value as a {@link BigDecimal}
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*/
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public BigDecimal getValue() {
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return value;
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}
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/**
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* Returns the current value as a {@link Double}.
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*
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* @return the current value as a {@link Double}
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*/
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public double getDouble() {
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return getValue().doubleValue();
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}
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/**
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* Returns the current value as a {@link Double} with the specified scale.
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*
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* @param scale the scale for the result
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* @return the current value as a {@link Double} with the specified scale
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*/
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public double getDouble(int scale) {
|
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return getValue(scale).doubleValue();
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}
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/**
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* Returns the current value as a {@link Long}.
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*
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* @return the current value as a {@link Long}
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*/
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public long getLong() {
|
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return getValue().longValue();
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}
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/**
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* Returns the current value as an {@link Integer}.
|
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*
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* @return the current value as an {@link Integer}
|
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*/
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public int getInteger() {
|
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return getValue().intValue();
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}
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/**
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* Applies the specified operator function to the current value and another value.
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*
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||||
* @param operator the operator function to apply
|
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* @param otherValue the value to apply the operator with
|
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* @return a ChainedCalcUtil instance with the updated value
|
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*/
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private ChainedCalcUtil operator(BiFunction<BigDecimal, BigDecimal, BigDecimal> operator, Object otherValue) {
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return operator(operator, otherValue, 9);
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}
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/**
|
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* Applies the specified operator function to the current value and another value with a
|
||||
* specified scale before the operation.
|
||||
*
|
||||
* @param operator the operator function to apply
|
||||
* @param other the value to apply the operator with
|
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* @param beforeOperateScale the scale to be applied before the operation,
|
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* or null if not applicable
|
||||
* @return a ChainedCalcUtil instance with the updated value
|
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*/
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private ChainedCalcUtil operator(BiFunction<BigDecimal, BigDecimal, BigDecimal> operator,
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||||
Object other,
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||||
Integer beforeOperateScale) {
|
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return baseOperator((otherValue) ->
|
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operator.apply(this.value, otherValue),
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other,
|
||||
beforeOperateScale);
|
||||
}
|
||||
|
||||
/**
|
||||
* Applies the specified operator function to the current value and another
|
||||
* value.
|
||||
*
|
||||
* @param operatorFunction the operator function to apply
|
||||
* @param anotherValue the value to apply the operator with
|
||||
* @param beforeOperateScale the scale to be applied before the operation,
|
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* or null if not applicable
|
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* @return a ChainedCalcUtil instance with the updated value
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*/
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private synchronized ChainedCalcUtil baseOperator(Function<BigDecimal, BigDecimal> operatorFunction,
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Object anotherValue,
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Integer beforeOperateScale) {
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if (Objects.isNull(anotherValue)) {
|
||||
return this;
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||||
}
|
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if (anotherValue instanceof ChainedCalcUtil) {
|
||||
this.value = operatorFunction.apply(((ChainedCalcUtil) anotherValue).getValue());
|
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return this;
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}
|
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this.value = operatorFunction.apply(convertBigDecimal(anotherValue, beforeOperateScale));
|
||||
return this;
|
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}
|
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|
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/**
|
||||
* Converts the specified value to a {@link BigDecimal}.
|
||||
*
|
||||
* @param value the value to convert
|
||||
* @param scale the scale to apply to the resulting BigDecimal, or null if not applicable
|
||||
* @return the converted BigDecimal value
|
||||
*/
|
||||
private BigDecimal convertBigDecimal(Object value, Integer scale) {
|
||||
if (Objects.isNull(value)) {
|
||||
return BigDecimal.ZERO;
|
||||
}
|
||||
BigDecimal res;
|
||||
if (value instanceof Number num) {
|
||||
res = BigDecimal.valueOf(num.doubleValue());
|
||||
} else {
|
||||
try {
|
||||
res = new BigDecimal(value.toString());
|
||||
} catch (NumberFormatException ignored) {
|
||||
return BigDecimal.ZERO;
|
||||
}
|
||||
}
|
||||
|
||||
if (Objects.nonNull(scale)) {
|
||||
return res.setScale(scale, RoundingMode.HALF_UP);
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
/**
|
||||
* -- GETTER --
|
||||
* Returns the current value as a BigDecimal.
|
||||
*/
|
||||
private BigDecimal value;
|
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|
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}
|
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@@ -0,0 +1,117 @@
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/*
|
||||
* Copyright (C) 2024-2025 OnixByte.
|
||||
*
|
||||
* Licensed 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.
|
||||
*/
|
||||
|
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package com.onixbyte.nums;
|
||||
|
||||
import com.onixbyte.nums.model.QuartileBounds;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
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import java.util.List;
|
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|
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/**
|
||||
* A utility class that provides methods for calculating percentiles and interquartile range (IQR)
|
||||
* bounds for a dataset.
|
||||
* <p>
|
||||
* This class contains static methods to:
|
||||
* <ul>
|
||||
* <li>Calculate a specified percentile from a list of double values using linear interpolation.</li>
|
||||
* <li>Calculate interquartile bounds (Q1, Q3) and the corresponding lower and upper bounds,
|
||||
* which can be used to identify outliers in the dataset.</li>
|
||||
* </ul>
|
||||
* <p>
|
||||
* This class is final, meaning it cannot be subclassed, and it only contains static methods,
|
||||
* so instances of the class cannot be created.
|
||||
* <h2>Example usage:</h2>
|
||||
* <pre>
|
||||
* {@code
|
||||
* List<Double> data = Arrays.asList(1.0, 2.0, 3.0, 4.0, 5.0);
|
||||
* Double percentileValue = PercentileCalculator.calculatePercentile(data, 50.0); // Calculates median
|
||||
* QuartileBounds bounds = PercentileCalculator.calculatePercentileBounds(data); // Calculates IQR bounds
|
||||
* }
|
||||
* </pre>
|
||||
*
|
||||
* @author zihluwang
|
||||
* @version 1.6.5
|
||||
* @since 1.6.5
|
||||
*/
|
||||
public final class PercentileCalculator {
|
||||
|
||||
private final static Logger log = LoggerFactory.getLogger(PercentileCalculator.class);
|
||||
|
||||
/**
|
||||
* Private constructor to prevent instantiation of this utility class.
|
||||
*/
|
||||
private PercentileCalculator() {
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates the specified percentile from a list of values.
|
||||
* <p>
|
||||
* This method takes a list of double values and calculates the given percentile using linear
|
||||
* interpolation between the two closest ranks. The list is first sorted in ascending order,
|
||||
* and the specified percentile is then calculated.
|
||||
*
|
||||
* @param values a list of {@code Double} values from which the percentile is calculated.
|
||||
* @param percentile a {@code Double} representing the percentile to be calculated (e.g., 50.0
|
||||
* for the median)
|
||||
* @return a {@code Double} value representing the calculated percentile
|
||||
*/
|
||||
public static Double calculatePercentile(List<Double> values, Double percentile) {
|
||||
if (values.isEmpty()) {
|
||||
throw new IllegalArgumentException("Unable to sort an empty list.");
|
||||
}
|
||||
var sorted = values.stream().sorted().toList();
|
||||
|
||||
var rank = percentile / 100. * (sorted.size() - 1);
|
||||
var lowerIndex = (int) Math.floor(rank);
|
||||
var upperIndex = (int) Math.ceil(rank);
|
||||
var weight = rank - lowerIndex;
|
||||
|
||||
return sorted.get(lowerIndex) * (1 - weight) + sorted.get(upperIndex) * weight;
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates the interquartile range (IQR) and the corresponding lower and upper bounds
|
||||
* based on the first (Q1) and third (Q3) quartiles of a dataset.
|
||||
* <p>
|
||||
* This method takes a list of double values, calculates the first quartile (Q1),
|
||||
* the third quartile (Q3), and the interquartile range (IQR). Using the IQR, it computes
|
||||
* the lower and upper bounds, which can be used to detect outliers in the dataset.
|
||||
* The lower bound is defined as {@code Q1 - 1.5 * IQR}, and the upper bound is defined as
|
||||
* {@code Q3 + 1.5 * IQR}.
|
||||
*
|
||||
* @param data a list of {@code Double} values for which the quartile bounds will be calculated
|
||||
* @return a {@code QuartileBounds} object containing the calculated lower and upper bounds
|
||||
*/
|
||||
public static QuartileBounds calculatePercentileBounds(List<Double> data) {
|
||||
var sorted = data.stream().sorted().toList();
|
||||
var Q1 = calculatePercentile(sorted, 25.);
|
||||
var Q3 = calculatePercentile(sorted, 75.);
|
||||
|
||||
var IQR = Q3 - Q1;
|
||||
|
||||
var lowerBound = Q1 - 1.5 * IQR;
|
||||
var upperBound = Q3 + 1.5 * IQR;
|
||||
|
||||
return QuartileBounds.builder()
|
||||
.upperBound(upperBound)
|
||||
.lowerBound(lowerBound)
|
||||
.build();
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,127 @@
|
||||
/*
|
||||
* Copyright (C) 2024-2025 OnixByte.
|
||||
*
|
||||
* Licensed 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.onixbyte.nums.model;
|
||||
|
||||
/**
|
||||
* A record representing the quartile bounds of a dataset.
|
||||
* <p>
|
||||
* This class encapsulates the lower and upper bounds of a dataset, which are typically used for
|
||||
* detecting outliers in the data. The bounds are calculated based on the interquartile range (IQR)
|
||||
* of the dataset. Values below the lower bound or above the upper bound may be considered outliers.
|
||||
* <p>
|
||||
* Quartile bounds consist of:
|
||||
* <ul>
|
||||
* <li>{@code lowerBound} - The lower bound of the dataset, typically {@code Q1 - 1.5 * IQR}.</li>
|
||||
* <li>{@code upperBound} - The upper bound of the dataset, typically {@code Q3 + 1.5 * IQR}.</li>
|
||||
* </ul>
|
||||
* <p>
|
||||
* Example usage:
|
||||
* <pre>
|
||||
* QuartileBounds bounds = QuartileBounds.builder()
|
||||
* .lowerBound(1.5)
|
||||
* .upperBound(7.5)
|
||||
* .build();
|
||||
* </pre>
|
||||
*
|
||||
* @param upperBound the upper bound of the dataset
|
||||
* @param lowerBound the lower bound of the dataset
|
||||
* @author zihluwang
|
||||
* @version 1.6.5
|
||||
* @since 1.6.5
|
||||
*/
|
||||
public record QuartileBounds(
|
||||
Double upperBound,
|
||||
Double lowerBound
|
||||
) {
|
||||
|
||||
/**
|
||||
* Creates a new {@link Builder} instance for building a {@code QuartileBounds} object.
|
||||
* <p>
|
||||
* The {@link Builder} pattern is used to construct the {@code QuartileBounds} object with
|
||||
* optional values for the upper and lower bounds.
|
||||
* </p>
|
||||
*
|
||||
* @return a new instance of the {@link Builder} class
|
||||
*/
|
||||
public static Builder builder() {
|
||||
return new Builder();
|
||||
}
|
||||
|
||||
/**
|
||||
* A builder class for constructing instances of the {@code QuartileBounds} record.
|
||||
* <p>
|
||||
* The {@link Builder} pattern allows for the step-by-step construction of a
|
||||
* {@code QuartileBounds} object, providing a flexible way to set values for the lower and
|
||||
* upper bounds. Once the builder has the required values, the {@link #build()} method creates
|
||||
* and returns a new {@code QuartileBounds} object.
|
||||
* </p>
|
||||
* <p>
|
||||
* Example usage:
|
||||
* <pre>
|
||||
* {@code
|
||||
* QuartileBounds bounds = QuartileBounds.builder()
|
||||
* .lowerBound(1.5)
|
||||
* .upperBound(7.5)
|
||||
* .build();
|
||||
* }
|
||||
* </pre>
|
||||
*/
|
||||
public static class Builder {
|
||||
private Double upperBound;
|
||||
private Double lowerBound;
|
||||
|
||||
/**
|
||||
* Private constructor to prevent instantiation of this utility class.
|
||||
*/
|
||||
private Builder() {
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the upper bound for the {@code QuartileBounds}.
|
||||
*
|
||||
* @param upperBound the upper bound of the dataset
|
||||
* @return the current {@code Builder} instance, for method chaining
|
||||
*/
|
||||
public Builder upperBound(Double upperBound) {
|
||||
this.upperBound = upperBound;
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the lower bound for the {@code QuartileBounds}.
|
||||
*
|
||||
* @param lowerBound the lower bound of the dataset
|
||||
* @return the current {@code Builder} instance, for method chaining
|
||||
*/
|
||||
public Builder lowerBound(Double lowerBound) {
|
||||
this.lowerBound = lowerBound;
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Builds and returns a new {@code QuartileBounds} instance with the specified upper and
|
||||
* lower bounds.
|
||||
*
|
||||
* @return a new {@code QuartileBounds} object containing the specified bounds
|
||||
*/
|
||||
public QuartileBounds build() {
|
||||
return new QuartileBounds(upperBound, lowerBound);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,32 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<!--
|
||||
~ Copyright (C) 2024-2024 OnixByte.
|
||||
~
|
||||
~ Licensed 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.
|
||||
-->
|
||||
|
||||
<configuration>
|
||||
<property name="COLOURFUL_OUTPUT" value="%black(%date{'dd MMM, yyyy HH:mm:ss', Asia/Hong_Kong, en-UK}) %highlight(%-5level) %black(---) %black([%10.10t]) %cyan(%-20.20logger{20}) %black(:) %msg%n"/>
|
||||
<property name="STANDARD_OUTPUT" value="%date{'dd MMM, yyyy HH:mm:ss', Asia/Hong_Kong, en-UK} %-5level %black(---) [%10.10t] %-20.20logger{20} : %msg%n"/>
|
||||
|
||||
<statusListener class="ch.qos.logback.core.status.NopStatusListener" />
|
||||
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
|
||||
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
|
||||
<pattern>${COLOURFUL_OUTPUT}</pattern>
|
||||
</encoder>
|
||||
</appender>
|
||||
<root level="INFO">
|
||||
<appender-ref ref="STDOUT"/>
|
||||
</root>
|
||||
</configuration>
|
||||
Reference in New Issue
Block a user