work on fixing interest calculation for declining balance loans.
This commit is contained in:
Keith Woodlock
@@ -11,7 +11,7 @@ public class CurrencyData implements Serializable {
|
||||
private final String nameCode;
|
||||
private final String displayLabel;
|
||||
|
||||
public CurrencyData(final String code, final String name, final int decimalPlaces, String displaySymbol, String nameCode) {
|
||||
public CurrencyData(final String code, final String name, final int decimalPlaces, final String displaySymbol, final String nameCode) {
|
||||
this.code = code;
|
||||
this.name = name;
|
||||
this.decimalPlaces = decimalPlaces;
|
||||
|
||||
+19
@@ -0,0 +1,19 @@
|
||||
package org.mifosng.platform.loanschedule.domain;
|
||||
|
||||
import java.math.BigDecimal;
|
||||
import java.util.List;
|
||||
|
||||
import org.joda.time.LocalDate;
|
||||
import org.mifosng.platform.api.data.CurrencyData;
|
||||
import org.mifosng.platform.api.data.LoanSchedule;
|
||||
import org.mifosng.platform.loan.domain.LoanProductRelatedDetail;
|
||||
|
||||
public interface AmortizationLoanScheduleGenerator {
|
||||
|
||||
LoanSchedule generate(LoanProductRelatedDetail loanScheduleInfo, LocalDate disbursementDate,
|
||||
LocalDate firstRepaymentDate, LocalDate interestCalculatedFrom, CurrencyData currencyData,
|
||||
BigDecimal periodInterestRateForRepaymentPeriod,
|
||||
LocalDate idealDisbursementDateBasedOnFirstRepaymentDate,
|
||||
List<LocalDate> scheduledDates);
|
||||
|
||||
}
|
||||
+27
-106
@@ -1,7 +1,6 @@
|
||||
package org.mifosng.platform.loanschedule.domain;
|
||||
|
||||
import java.math.BigDecimal;
|
||||
import java.math.RoundingMode;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
@@ -13,16 +12,31 @@ import org.mifosng.platform.api.data.MoneyData;
|
||||
import org.mifosng.platform.api.data.ScheduledLoanInstallment;
|
||||
import org.mifosng.platform.currency.domain.MonetaryCurrency;
|
||||
import org.mifosng.platform.currency.domain.Money;
|
||||
import org.mifosng.platform.loan.domain.AmortizationMethod;
|
||||
import org.mifosng.platform.loan.domain.LoanProductRelatedDetail;
|
||||
import org.mifosng.platform.loan.domain.PeriodFrequencyType;
|
||||
|
||||
public class DecliningBalanceMethodLoanScheduleGenerator implements
|
||||
LoanScheduleGenerator {
|
||||
/**
|
||||
* <p>
|
||||
* Declining balance can amortized (see {@link AmortizationMethod}) in two ways at present:
|
||||
* <ol><li>Equal principal payments</li><li>Equal installment payments</li></ol>
|
||||
* </p>
|
||||
*
|
||||
* <p>
|
||||
* When amortized using <i>equal principal payments</i>, the <b>principal component</b> of each installment is fixed and <b>interest due</b>
|
||||
* is calculated from the <b>outstanding principal balance</b> resulting in a different <b>total payment due</b> for each installment.
|
||||
* </p>
|
||||
*
|
||||
* <p>
|
||||
* When amortized using <i>equal installments</i>, the <b>total payment due</b> for each installment is fixed and
|
||||
* is calculated using the excel like <code>pmt</code> function. The <b>interest due</b> is calculated from the <b>outstanding principal balance</b>
|
||||
* which results in a <b>principal component</b> that is <b>total payment due</b> minus <b>interest due</b>.
|
||||
* </p>
|
||||
*/
|
||||
public class DecliningBalanceMethodLoanScheduleGenerator implements LoanScheduleGenerator {
|
||||
|
||||
private final ScheduledDateGenerator scheduledDateGenerator = new DefaultScheduledDateGenerator();
|
||||
private final PaymentPeriodsInOneYearCalculator paymentPeriodsInOneYearCalculator = new DefaultPaymentPeriodsInOneYearCalculator();
|
||||
private final PeriodicInterestRateCalculator periodicInterestRateCalculator = new PeriodicInterestRateCalculator();
|
||||
private final PmtCalculator pmtCalculator = new PmtCalculator();
|
||||
|
||||
@Override
|
||||
public LoanSchedule generate(
|
||||
@@ -31,114 +45,21 @@ public class DecliningBalanceMethodLoanScheduleGenerator implements
|
||||
final PeriodFrequencyType loanTermFrequencyType,
|
||||
final LocalDate disbursementDate,
|
||||
final LocalDate firstRepaymentDate,
|
||||
final LocalDate interestCalculatedFrom, CurrencyData currencyData) {
|
||||
|
||||
List<ScheduledLoanInstallment> scheduledLoanInstallments = new ArrayList<ScheduledLoanInstallment>();
|
||||
final LocalDate interestCalculatedFrom,
|
||||
final CurrencyData currencyData) {
|
||||
|
||||
// 1. generate valid set of 'due dates' based on some of the 'loan attributes'
|
||||
List<LocalDate> scheduledDates = this.scheduledDateGenerator.generate(loanScheduleInfo, disbursementDate, firstRepaymentDate);
|
||||
|
||||
LocalDate idealDisbursementDateBasedOnFirstRepaymentDate = this.scheduledDateGenerator.idealDisbursementDateBasedOnFirstRepaymentDate(loanScheduleInfo, scheduledDates);
|
||||
|
||||
// 2. determine the 'periodic' interest rate based on the 'repayment periods' so we can use
|
||||
final BigDecimal periodInterestRateForRepaymentPeriod = this.periodicInterestRateCalculator.calculateFrom(loanScheduleInfo);
|
||||
|
||||
// 3. determine 'total payment' for each repayment based on pmt function (and hence the total due overall)
|
||||
final MonetaryCurrency monetaryCurrency = loanScheduleInfo.getPrincipal().getCurrency();
|
||||
Money totalDuePerInstallment = this.pmtCalculator.calculatePaymentForOnePeriodFrom(loanScheduleInfo, periodInterestRateForRepaymentPeriod, monetaryCurrency);
|
||||
// final Money totalDue = this.pmtCalculator.calculateTotalRepaymentFrom(loanScheduleInfo, periodInterestRateForRepaymentPeriod, monetaryCurrency);
|
||||
|
||||
// REVIEW. calculate total interest due based on loan term settings rather than inferring loan term from regular repayment schedule
|
||||
final BigDecimal periodInterestRateForLoanTermPeriod = this.periodicInterestRateCalculator.calculateFrom(loanTermFrequencyType, loanScheduleInfo.getAnnualNominalInterestRate());
|
||||
final Money totalRepaymentDueForLoanTerm = this.pmtCalculator.calculateTotalRepaymentFrom(loanScheduleInfo.getPrincipal(), loanTermFrequency, periodInterestRateForLoanTermPeriod, monetaryCurrency);
|
||||
|
||||
totalDuePerInstallment = totalRepaymentDueForLoanTerm.dividedBy(loanScheduleInfo.getNumberOfRepayments(), RoundingMode.HALF_EVEN);
|
||||
|
||||
Money totalInterestDue = totalRepaymentDueForLoanTerm.minus(loanScheduleInfo.getPrincipal());
|
||||
Money outstandingBalance = loanScheduleInfo.getPrincipal();
|
||||
Money totalPrincipal = Money.zero(monetaryCurrency);
|
||||
Money totalInterest = Money.zero(monetaryCurrency);
|
||||
|
||||
LocalDate idealDisbursementDateBasedOnFirstRepaymentDate = this.scheduledDateGenerator.idealDisbursementDateBasedOnFirstRepaymentDate(loanScheduleInfo, scheduledDates);
|
||||
double interestCalculationGraceOnRepaymentPeriodFraction = this.paymentPeriodsInOneYearCalculator.calculateRepaymentPeriodAsAFractionOfDays(loanScheduleInfo.getRepaymentPeriodFrequencyType(),
|
||||
loanScheduleInfo.getRepayEvery(), interestCalculatedFrom, scheduledDates, idealDisbursementDateBasedOnFirstRepaymentDate);
|
||||
|
||||
LocalDate startDate = disbursementDate;
|
||||
int installmentNumber = 1;
|
||||
for (LocalDate scheduledDueDate : scheduledDates) {
|
||||
|
||||
// number of days from startDate to this scheduledDate
|
||||
int daysInPeriod = Days.daysBetween(startDate.toDateMidnight().toDateTime(), scheduledDueDate.toDateMidnight().toDateTime()).getDays();
|
||||
|
||||
// TODO - total interest for loan is calculated using loan term settings (loanTermFrequency & loanTermFrequencyType)
|
||||
// - its possible that the 'repyament schedule' is irregular in which case the interest for the installment might not be the periodic interest rate
|
||||
// - but infact somethink like twice it e.g. 4 month installment followed by 2 month installment followed by 1 month installment
|
||||
// - the below doesnt really support highly irregular loan schedules and this case needs to be looked at.
|
||||
Money interestForInstallment = this.periodicInterestRateCalculator.calculateInterestOn(outstandingBalance, periodInterestRateForRepaymentPeriod, daysInPeriod, loanScheduleInfo);
|
||||
Money principalForInstallment = this.periodicInterestRateCalculator.calculatePrincipalOn(totalDuePerInstallment, interestForInstallment, loanScheduleInfo);
|
||||
|
||||
if (interestCalculationGraceOnRepaymentPeriodFraction >= Integer.valueOf(1).doubleValue()) {
|
||||
Money graceOnInterestForRepaymentPeriod = interestForInstallment;
|
||||
interestForInstallment = interestForInstallment.minus(graceOnInterestForRepaymentPeriod);
|
||||
totalInterestDue = totalInterestDue.minus(graceOnInterestForRepaymentPeriod);
|
||||
interestCalculationGraceOnRepaymentPeriodFraction = interestCalculationGraceOnRepaymentPeriodFraction - Integer.valueOf(1).doubleValue();
|
||||
} else if (interestCalculationGraceOnRepaymentPeriodFraction > Double.valueOf("0.25") && interestCalculationGraceOnRepaymentPeriodFraction < Integer.valueOf(1).doubleValue()) {
|
||||
Money graceOnInterestForRepaymentPeriod = interestForInstallment.multipliedBy(interestCalculationGraceOnRepaymentPeriodFraction);
|
||||
interestForInstallment = interestForInstallment.minus(graceOnInterestForRepaymentPeriod);
|
||||
totalInterestDue = totalInterestDue.minus(graceOnInterestForRepaymentPeriod);
|
||||
interestCalculationGraceOnRepaymentPeriodFraction = Double.valueOf("0");
|
||||
}
|
||||
|
||||
totalPrincipal = totalPrincipal.plus(principalForInstallment);
|
||||
totalInterest = totalInterest.plus(interestForInstallment);
|
||||
|
||||
if (installmentNumber == loanScheduleInfo.getNumberOfRepayments()) {
|
||||
Money principalDifference = totalPrincipal.minus(loanScheduleInfo.getPrincipal());
|
||||
if (principalDifference.isLessThanZero()) {
|
||||
principalForInstallment = principalForInstallment.plus(principalDifference.abs());
|
||||
} else if (principalDifference.isGreaterThanZero()) {
|
||||
principalForInstallment = principalForInstallment.minus(principalDifference.abs());
|
||||
}
|
||||
|
||||
final Money interestDifference = totalInterest.minus(totalInterestDue);
|
||||
if (interestDifference.isLessThanZero()) {
|
||||
interestForInstallment = interestForInstallment.plus(interestDifference.abs());
|
||||
} else if (interestDifference.isGreaterThanZero()) {
|
||||
interestForInstallment = interestForInstallment.minus(interestDifference.abs());
|
||||
}
|
||||
|
||||
// if (loanScheduleInfo.getAmortizationMethod().equals(AmortizationMethod.EQUAL_INSTALLMENTS)) {
|
||||
// Money interestDifference = totalInterest.minus(totalInterestDue);
|
||||
// if (interestDifference.isLessThanZero()) {
|
||||
// interestForInstallment = interestForInstallment.plus(interestDifference.abs());
|
||||
// } else if (interestDifference.isGreaterThanZero()) {
|
||||
// interestForInstallment = interestForInstallment.minus(interestDifference.abs());
|
||||
// }
|
||||
// }
|
||||
}
|
||||
|
||||
Money totalInstallmentDue = principalForInstallment.plus(interestForInstallment);
|
||||
|
||||
outstandingBalance = outstandingBalance.minus(principalForInstallment);
|
||||
|
||||
MoneyData principalPerInstallmentValue = MoneyData.of(currencyData, principalForInstallment.getAmount());
|
||||
MoneyData interestPerInstallmentValue = MoneyData.of(currencyData, interestForInstallment.getAmount());
|
||||
MoneyData totalInstallmentDueValue = MoneyData.of(currencyData, totalInstallmentDue.getAmount());
|
||||
MoneyData outstandingBalanceValue = MoneyData.of(currencyData, outstandingBalance.getAmount());
|
||||
|
||||
ScheduledLoanInstallment installment = new ScheduledLoanInstallment(
|
||||
Integer.valueOf(installmentNumber), startDate,
|
||||
scheduledDueDate, principalPerInstallmentValue,
|
||||
interestPerInstallmentValue,
|
||||
totalInstallmentDueValue,
|
||||
outstandingBalanceValue);
|
||||
|
||||
scheduledLoanInstallments.add(installment);
|
||||
|
||||
startDate = scheduledDueDate;
|
||||
|
||||
installmentNumber++;
|
||||
}
|
||||
|
||||
return new LoanSchedule(scheduledLoanInstallments);
|
||||
// Determine with 'amortisation' approach to use
|
||||
AmortizationLoanScheduleGenerator generator = new EqualInstallmentsAmortizationLoanScheduleGenerator();
|
||||
return generator.generate(loanScheduleInfo, disbursementDate, firstRepaymentDate, interestCalculatedFrom, currencyData,
|
||||
periodInterestRateForRepaymentPeriod, idealDisbursementDateBasedOnFirstRepaymentDate, scheduledDates);
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
+114
@@ -0,0 +1,114 @@
|
||||
package org.mifosng.platform.loanschedule.domain;
|
||||
|
||||
import java.math.BigDecimal;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
import org.joda.time.Days;
|
||||
import org.joda.time.LocalDate;
|
||||
import org.mifosng.platform.api.data.CurrencyData;
|
||||
import org.mifosng.platform.api.data.LoanSchedule;
|
||||
import org.mifosng.platform.api.data.MoneyData;
|
||||
import org.mifosng.platform.api.data.ScheduledLoanInstallment;
|
||||
import org.mifosng.platform.currency.domain.MonetaryCurrency;
|
||||
import org.mifosng.platform.currency.domain.Money;
|
||||
import org.mifosng.platform.loan.domain.LoanProductRelatedDetail;
|
||||
|
||||
public class EqualInstallmentsAmortizationLoanScheduleGenerator implements AmortizationLoanScheduleGenerator {
|
||||
|
||||
private final PeriodicInterestRateCalculator periodicInterestRateCalculator = new PeriodicInterestRateCalculator();
|
||||
private final PaymentPeriodsInOneYearCalculator paymentPeriodsInOneYearCalculator = new DefaultPaymentPeriodsInOneYearCalculator();
|
||||
private final PmtCalculator pmtCalculator = new PmtCalculator();
|
||||
|
||||
@Override
|
||||
public LoanSchedule generate(final LoanProductRelatedDetail loanScheduleInfo,
|
||||
final LocalDate disbursementDate,
|
||||
final LocalDate firstRepaymentDate,
|
||||
final LocalDate interestCalculatedFrom,
|
||||
final CurrencyData currencyData,
|
||||
final BigDecimal periodInterestRateForRepaymentPeriod,
|
||||
final LocalDate idealDisbursementDateBasedOnFirstRepaymentDate,
|
||||
final List<LocalDate> scheduledDates) {
|
||||
|
||||
List<ScheduledLoanInstallment> scheduledLoanInstallments = new ArrayList<ScheduledLoanInstallment>();
|
||||
|
||||
// 3. determine 'total payment' for each repayment based on pmt function (and hence the total due overall)
|
||||
final MonetaryCurrency monetaryCurrency = loanScheduleInfo.getPrincipal().getCurrency();
|
||||
Money totalDuePerInstallment = this.pmtCalculator.calculatePaymentForOnePeriodFrom(loanScheduleInfo, periodInterestRateForRepaymentPeriod, monetaryCurrency);
|
||||
final Money totalRepaymentDueForLoanTerm = this.pmtCalculator.calculateTotalRepaymentFrom(loanScheduleInfo, periodInterestRateForRepaymentPeriod, monetaryCurrency);
|
||||
|
||||
Money totalInterestDue = totalRepaymentDueForLoanTerm.minus(loanScheduleInfo.getPrincipal());
|
||||
Money outstandingBalance = loanScheduleInfo.getPrincipal();
|
||||
Money totalPrincipal = Money.zero(monetaryCurrency);
|
||||
Money totalInterest = Money.zero(monetaryCurrency);
|
||||
|
||||
double interestCalculationGraceOnRepaymentPeriodFraction = this.paymentPeriodsInOneYearCalculator.calculateRepaymentPeriodAsAFractionOfDays(loanScheduleInfo.getRepaymentPeriodFrequencyType(),
|
||||
loanScheduleInfo.getRepayEvery(), interestCalculatedFrom, scheduledDates, idealDisbursementDateBasedOnFirstRepaymentDate);
|
||||
|
||||
LocalDate startDate = disbursementDate;
|
||||
int installmentNumber = 1;
|
||||
for (LocalDate scheduledDueDate : scheduledDates) {
|
||||
|
||||
// number of days from startDate to this scheduledDate
|
||||
int daysInPeriod = Days.daysBetween(startDate.toDateMidnight().toDateTime(), scheduledDueDate.toDateMidnight().toDateTime()).getDays();
|
||||
|
||||
Money interestForInstallment = this.periodicInterestRateCalculator.calculateInterestOn(outstandingBalance, periodInterestRateForRepaymentPeriod, daysInPeriod, loanScheduleInfo);
|
||||
Money principalForInstallment = this.periodicInterestRateCalculator.calculatePrincipalOn(totalDuePerInstallment, interestForInstallment, loanScheduleInfo);
|
||||
|
||||
if (interestCalculationGraceOnRepaymentPeriodFraction >= Integer.valueOf(1).doubleValue()) {
|
||||
Money graceOnInterestForRepaymentPeriod = interestForInstallment;
|
||||
interestForInstallment = interestForInstallment.minus(graceOnInterestForRepaymentPeriod);
|
||||
totalInterestDue = totalInterestDue.minus(graceOnInterestForRepaymentPeriod);
|
||||
interestCalculationGraceOnRepaymentPeriodFraction = interestCalculationGraceOnRepaymentPeriodFraction - Integer.valueOf(1).doubleValue();
|
||||
} else if (interestCalculationGraceOnRepaymentPeriodFraction > Double.valueOf("0.25") && interestCalculationGraceOnRepaymentPeriodFraction < Integer.valueOf(1).doubleValue()) {
|
||||
Money graceOnInterestForRepaymentPeriod = interestForInstallment.multipliedBy(interestCalculationGraceOnRepaymentPeriodFraction);
|
||||
interestForInstallment = interestForInstallment.minus(graceOnInterestForRepaymentPeriod);
|
||||
totalInterestDue = totalInterestDue.minus(graceOnInterestForRepaymentPeriod);
|
||||
interestCalculationGraceOnRepaymentPeriodFraction = Double.valueOf("0");
|
||||
}
|
||||
|
||||
totalPrincipal = totalPrincipal.plus(principalForInstallment);
|
||||
totalInterest = totalInterest.plus(interestForInstallment);
|
||||
|
||||
if (installmentNumber == loanScheduleInfo.getNumberOfRepayments()) {
|
||||
Money principalDifference = totalPrincipal.minus(loanScheduleInfo.getPrincipal());
|
||||
if (principalDifference.isLessThanZero()) {
|
||||
principalForInstallment = principalForInstallment.plus(principalDifference.abs());
|
||||
} else if (principalDifference.isGreaterThanZero()) {
|
||||
principalForInstallment = principalForInstallment.minus(principalDifference.abs());
|
||||
}
|
||||
|
||||
final Money interestDifference = totalInterest.minus(totalInterestDue);
|
||||
if (interestDifference.isLessThanZero()) {
|
||||
interestForInstallment = interestForInstallment.plus(interestDifference.abs());
|
||||
} else if (interestDifference.isGreaterThanZero()) {
|
||||
interestForInstallment = interestForInstallment.minus(interestDifference.abs());
|
||||
}
|
||||
}
|
||||
|
||||
Money totalInstallmentDue = principalForInstallment.plus(interestForInstallment);
|
||||
|
||||
outstandingBalance = outstandingBalance.minus(principalForInstallment);
|
||||
|
||||
MoneyData principalPerInstallmentValue = MoneyData.of(currencyData, principalForInstallment.getAmount());
|
||||
MoneyData interestPerInstallmentValue = MoneyData.of(currencyData, interestForInstallment.getAmount());
|
||||
MoneyData totalInstallmentDueValue = MoneyData.of(currencyData, totalInstallmentDue.getAmount());
|
||||
MoneyData outstandingBalanceValue = MoneyData.of(currencyData, outstandingBalance.getAmount());
|
||||
|
||||
ScheduledLoanInstallment installment = new ScheduledLoanInstallment(
|
||||
Integer.valueOf(installmentNumber), startDate,
|
||||
scheduledDueDate, principalPerInstallmentValue,
|
||||
interestPerInstallmentValue,
|
||||
totalInstallmentDueValue,
|
||||
outstandingBalanceValue);
|
||||
|
||||
scheduledLoanInstallments.add(installment);
|
||||
|
||||
startDate = scheduledDueDate;
|
||||
|
||||
installmentNumber++;
|
||||
}
|
||||
|
||||
return new LoanSchedule(scheduledLoanInstallments);
|
||||
}
|
||||
}
|
||||
+133
@@ -0,0 +1,133 @@
|
||||
package org.mifosng.platform.loanschedule.domain;
|
||||
|
||||
import java.math.BigDecimal;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
import org.joda.time.Days;
|
||||
import org.joda.time.LocalDate;
|
||||
import org.mifosng.platform.api.data.CurrencyData;
|
||||
import org.mifosng.platform.api.data.LoanSchedule;
|
||||
import org.mifosng.platform.api.data.MoneyData;
|
||||
import org.mifosng.platform.api.data.ScheduledLoanInstallment;
|
||||
import org.mifosng.platform.currency.domain.MonetaryCurrency;
|
||||
import org.mifosng.platform.currency.domain.Money;
|
||||
import org.mifosng.platform.loan.domain.LoanProductRelatedDetail;
|
||||
|
||||
public class EqualInstallmentsWithIrregularRepaymentScheduleAmortizationLoanScheduleGenerator implements AmortizationLoanScheduleGenerator {
|
||||
|
||||
private final PeriodicInterestRateCalculator periodicInterestRateCalculator = new PeriodicInterestRateCalculator();
|
||||
private final PaymentPeriodsInOneYearCalculator paymentPeriodsInOneYearCalculator = new DefaultPaymentPeriodsInOneYearCalculator();
|
||||
private final PmtCalculator pmtCalculator = new PmtCalculator();
|
||||
|
||||
@Override
|
||||
public LoanSchedule generate(final LoanProductRelatedDetail loanScheduleInfo,
|
||||
final LocalDate disbursementDate,
|
||||
final LocalDate firstRepaymentDate,
|
||||
final LocalDate interestCalculatedFrom,
|
||||
final CurrencyData currencyData,
|
||||
final BigDecimal periodInterestRateForRepaymentPeriod,
|
||||
final LocalDate idealDisbursementDateBasedOnFirstRepaymentDate,
|
||||
final List<LocalDate> scheduledDates) {
|
||||
|
||||
List<ScheduledLoanInstallment> scheduledLoanInstallments = new ArrayList<ScheduledLoanInstallment>();
|
||||
|
||||
// 3. determine 'total payment' for each repayment based on pmt function (and hence the total due overall)
|
||||
final MonetaryCurrency monetaryCurrency = loanScheduleInfo.getPrincipal().getCurrency();
|
||||
Money totalDuePerInstallment = this.pmtCalculator.calculatePaymentForOnePeriodFrom(loanScheduleInfo, periodInterestRateForRepaymentPeriod, monetaryCurrency);
|
||||
final Money totalRepaymentDueForLoanTerm = this.pmtCalculator.calculateTotalRepaymentFrom(loanScheduleInfo, periodInterestRateForRepaymentPeriod, monetaryCurrency);
|
||||
|
||||
// REVIEW. calculate total interest due based on loan term settings rather than inferring loan term from regular repayment schedule
|
||||
// final BigDecimal periodInterestRateForLoanTermPeriod = this.periodicInterestRateCalculator.calculateFrom(loanTermFrequencyType, loanScheduleInfo.getAnnualNominalInterestRate());
|
||||
// final Money totalRepaymentDueForLoanTerm = this.pmtCalculator.calculateTotalRepaymentFrom(loanScheduleInfo.getPrincipal(), loanTermFrequency, periodInterestRateForLoanTermPeriod, monetaryCurrency);
|
||||
|
||||
// totalDuePerInstallment = totalRepaymentDueForLoanTerm.dividedBy(loanScheduleInfo.getNumberOfRepayments(), RoundingMode.HALF_EVEN);
|
||||
|
||||
Money totalInterestDue = totalRepaymentDueForLoanTerm.minus(loanScheduleInfo.getPrincipal());
|
||||
Money outstandingBalance = loanScheduleInfo.getPrincipal();
|
||||
Money totalPrincipal = Money.zero(monetaryCurrency);
|
||||
Money totalInterest = Money.zero(monetaryCurrency);
|
||||
|
||||
double interestCalculationGraceOnRepaymentPeriodFraction = this.paymentPeriodsInOneYearCalculator.calculateRepaymentPeriodAsAFractionOfDays(loanScheduleInfo.getRepaymentPeriodFrequencyType(),
|
||||
loanScheduleInfo.getRepayEvery(), interestCalculatedFrom, scheduledDates, idealDisbursementDateBasedOnFirstRepaymentDate);
|
||||
|
||||
LocalDate startDate = disbursementDate;
|
||||
int installmentNumber = 1;
|
||||
for (LocalDate scheduledDueDate : scheduledDates) {
|
||||
|
||||
// number of days from startDate to this scheduledDate
|
||||
int daysInPeriod = Days.daysBetween(startDate.toDateMidnight().toDateTime(), scheduledDueDate.toDateMidnight().toDateTime()).getDays();
|
||||
|
||||
// TODO - total interest for loan is calculated using loan term settings (loanTermFrequency & loanTermFrequencyType)
|
||||
// - its possible that the 'repyament schedule' is irregular in which case the interest for the installment might not be the periodic interest rate
|
||||
// - but infact somethink like twice it e.g. 4 month installment followed by 2 month installment followed by 1 month installment
|
||||
// - the below doesnt really support highly irregular loan schedules and this case needs to be looked at.
|
||||
Money interestForInstallment = this.periodicInterestRateCalculator.calculateInterestOn(outstandingBalance, periodInterestRateForRepaymentPeriod, daysInPeriod, loanScheduleInfo);
|
||||
Money principalForInstallment = this.periodicInterestRateCalculator.calculatePrincipalOn(totalDuePerInstallment, interestForInstallment, loanScheduleInfo);
|
||||
|
||||
if (interestCalculationGraceOnRepaymentPeriodFraction >= Integer.valueOf(1).doubleValue()) {
|
||||
Money graceOnInterestForRepaymentPeriod = interestForInstallment;
|
||||
interestForInstallment = interestForInstallment.minus(graceOnInterestForRepaymentPeriod);
|
||||
totalInterestDue = totalInterestDue.minus(graceOnInterestForRepaymentPeriod);
|
||||
interestCalculationGraceOnRepaymentPeriodFraction = interestCalculationGraceOnRepaymentPeriodFraction - Integer.valueOf(1).doubleValue();
|
||||
} else if (interestCalculationGraceOnRepaymentPeriodFraction > Double.valueOf("0.25") && interestCalculationGraceOnRepaymentPeriodFraction < Integer.valueOf(1).doubleValue()) {
|
||||
Money graceOnInterestForRepaymentPeriod = interestForInstallment.multipliedBy(interestCalculationGraceOnRepaymentPeriodFraction);
|
||||
interestForInstallment = interestForInstallment.minus(graceOnInterestForRepaymentPeriod);
|
||||
totalInterestDue = totalInterestDue.minus(graceOnInterestForRepaymentPeriod);
|
||||
interestCalculationGraceOnRepaymentPeriodFraction = Double.valueOf("0");
|
||||
}
|
||||
|
||||
totalPrincipal = totalPrincipal.plus(principalForInstallment);
|
||||
totalInterest = totalInterest.plus(interestForInstallment);
|
||||
|
||||
if (installmentNumber == loanScheduleInfo.getNumberOfRepayments()) {
|
||||
Money principalDifference = totalPrincipal.minus(loanScheduleInfo.getPrincipal());
|
||||
if (principalDifference.isLessThanZero()) {
|
||||
principalForInstallment = principalForInstallment.plus(principalDifference.abs());
|
||||
} else if (principalDifference.isGreaterThanZero()) {
|
||||
principalForInstallment = principalForInstallment.minus(principalDifference.abs());
|
||||
}
|
||||
|
||||
final Money interestDifference = totalInterest.minus(totalInterestDue);
|
||||
if (interestDifference.isLessThanZero()) {
|
||||
interestForInstallment = interestForInstallment.plus(interestDifference.abs());
|
||||
} else if (interestDifference.isGreaterThanZero()) {
|
||||
interestForInstallment = interestForInstallment.minus(interestDifference.abs());
|
||||
}
|
||||
|
||||
// if (loanScheduleInfo.getAmortizationMethod().equals(AmortizationMethod.EQUAL_INSTALLMENTS)) {
|
||||
// Money interestDifference = totalInterest.minus(totalInterestDue);
|
||||
// if (interestDifference.isLessThanZero()) {
|
||||
// interestForInstallment = interestForInstallment.plus(interestDifference.abs());
|
||||
// } else if (interestDifference.isGreaterThanZero()) {
|
||||
// interestForInstallment = interestForInstallment.minus(interestDifference.abs());
|
||||
// }
|
||||
// }
|
||||
}
|
||||
|
||||
Money totalInstallmentDue = principalForInstallment.plus(interestForInstallment);
|
||||
|
||||
outstandingBalance = outstandingBalance.minus(principalForInstallment);
|
||||
|
||||
MoneyData principalPerInstallmentValue = MoneyData.of(currencyData, principalForInstallment.getAmount());
|
||||
MoneyData interestPerInstallmentValue = MoneyData.of(currencyData, interestForInstallment.getAmount());
|
||||
MoneyData totalInstallmentDueValue = MoneyData.of(currencyData, totalInstallmentDue.getAmount());
|
||||
MoneyData outstandingBalanceValue = MoneyData.of(currencyData, outstandingBalance.getAmount());
|
||||
|
||||
ScheduledLoanInstallment installment = new ScheduledLoanInstallment(
|
||||
Integer.valueOf(installmentNumber), startDate,
|
||||
scheduledDueDate, principalPerInstallmentValue,
|
||||
interestPerInstallmentValue,
|
||||
totalInstallmentDueValue,
|
||||
outstandingBalanceValue);
|
||||
|
||||
scheduledLoanInstallments.add(installment);
|
||||
|
||||
startDate = scheduledDueDate;
|
||||
|
||||
installmentNumber++;
|
||||
}
|
||||
|
||||
return new LoanSchedule(scheduledLoanInstallments);
|
||||
}
|
||||
}
|
||||
+5
-3
@@ -34,9 +34,11 @@ public class PeriodicInterestRateCalculator {
|
||||
return loanScheduleInfo.getAnnualNominalInterestRate().divide(divisor, mc).multiply(numberOfPeriods);
|
||||
}
|
||||
|
||||
public Money calculateInterestOn(Money outstandingBalance, BigDecimal periodInterestRateForRepaymentPeriod,
|
||||
int daysInPeriod,
|
||||
LoanProductRelatedDetail loanScheduleInfo) {
|
||||
public Money calculateInterestOn(
|
||||
final Money outstandingBalance,
|
||||
final BigDecimal periodInterestRateForRepaymentPeriod,
|
||||
final int daysInPeriod,
|
||||
final LoanProductRelatedDetail loanScheduleInfo) {
|
||||
|
||||
MathContext mc = new MathContext(8, RoundingMode.HALF_EVEN);
|
||||
Money interestDue = Money.zero(outstandingBalance.getCurrency());
|
||||
|
||||
Reference in New Issue
Block a user