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Payroll Worker API project for Spring Boot

There is a newer version: 0.0.4-RELEASE

package tech.deepdreams.worker.services.deduction ;
import java.util.Arrays;
import java.util.Map;

import net.objecthunter.exp4j.Expression;
import net.objecthunter.exp4j.ExpressionBuilder;
import tech.deepdreams.worker.api.services.DeductionService;
import tech.deepdreams.worker.constants.CIVElementCode;
import tech.deepdreams.worker.constants.LocalConstantCode;
import tech.deepdreams.worker.api.enums.CountryCode;

public class IGRServicev2020Impl implements DeductionService{
	
	
	public Double calculateEmployee(Map params) {
		Double shares = (Double) params.get(LocalConstantCode.CODE_SHARES) ;
		Double value = (Double) params.get(LocalConstantCode.CODE_GROSS_TAXABLE_SALARY) ;
		Double amountIS = (Double) params.get(CIVElementCode.CODE_IS) ;
		Double amountCN = (Double) params.get(CIVElementCode.CODE_CN) ;
		
		Double base = 0.85*(0.80*value-(amountIS+amountCN))/shares ;
		int rawIndex = Arrays.binarySearch(rangeArray, base) ;
		
		int index = Math.max(rawIndex >= 0 ? rawIndex - 1 : -1 * (rawIndex + 1) - 1, 0) ;
		
		String formula = formulaArray[index] ;

		String[] variables = new String[] { "BASE", "SHARES" } ;
		Expression expression = new ExpressionBuilder(formula).variables(variables).build() ;
		expression.setVariable("BASE", base) ;
		expression.setVariable("SHARES", shares) ;
		Object resultat =  expression.evaluate() ;
		return Double.parseDouble(resultat.toString()) ;
	}

	
	public Double calculateEmployer(Map params) {
		return 0.0 ;
	}
	
	
	public CountryCode country() {
		return CountryCode.CIV ;
	}
	
	
	public String code() {
		return CIVElementCode.CODE_IGR ;
	}
	
	
	public int version() {
		return 2020 ;
	}
	
	
	private Double[] rangeArray = new Double[] {0.0, 25_000.0, 45_584.0, 81_584.0, 126_584.0, 220_334.0, 389_084.0, 842_167.0, 999_999_999.99} ;
	
	
	private String[] formulaArray = new String[] {
			"0", 
			"BASE*10/110-2273*SHARES", 
			"BASE*15/115-4076*SHARES", 
			"BASE*20/120-7031*SHARES",
			"BASE*25/125-11250*SHARES",
			"BASE*35/135-24306*SHARES",
			"BASE*45/145-44181*SHARES",
			"BASE*60/160-98633*SHARES"
		} ;
}