• Home
• com.github.thanglequoc
• aqi-calculator
• 1.3.2
• source code
• PollutantConcentrationTruncator.java

×

Project download

Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $

You can buy this project and download/modify it how often you want.

com.thanglequoc.aqicalculator.PollutantConcentrationTruncator Maven / Gradle / Ivy

package com.thanglequoc.aqicalculator;

/**
 * PollutantConcentrationTruncator which will support the truncation for
 * pollutant based on US EPA rule
 * 

 *
 * @author ThangLeQuoc
 * @see  AQI Calculator
 * Guide , section AQI Calculation Turtorial 
 */
class PollutantConcentrationTruncator {
    
    /**
     * Gets the truncated pollutant concentration on pollutant code.
     * 

     * For PM10, SO2, NO2, truncate to integer 

     * For PM2.5, CO, truncate to 1 decimal place 

     * For Ozone, truncate to 3 decimal place
     *
     * @param pollutant     the pollutant (PM10, PM2.5, O3, CO, NO2, SO2)
     * @param concentration the concentration
     * @return the truncated concentration base on pollutant
     */
    double getTruncatedPollutantConcentrationBaseOnPollutant(Pollutant pollutant, double concentration) {
        if (Pollutant.PM10.equals(pollutant) || Pollutant.SO2.equals(pollutant) || Pollutant.NO2.equals(pollutant)) {
            return Math.round(concentration);
        }
        if (Pollutant.CO.equals(pollutant) || Pollutant.PM25.equals(pollutant)) {
            return Math.round(concentration * 10d) / 10d;
        }
        return Math.round(concentration * 1000d) / 1000d;
        
    }
    
}