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finmath lib is a Mathematical Finance Library in Java. It provides algorithms and methodologies related to mathematical finance.
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/*
 * (c) Copyright Christian P. Fries, Germany. Contact: [email protected].
 *
 * Created on 17.02.2013
 */
package net.finmath.marketdata.model.volatilities;

import java.time.LocalDate;

import net.finmath.functions.AnalyticFormulas;
import net.finmath.marketdata.model.AnalyticModel;
import net.finmath.marketdata.model.curves.DiscountCurve;
import net.finmath.marketdata.model.curves.ForwardCurve;
import net.finmath.time.daycount.DayCountConvention;

/**
 * Abstract base class for a volatility surface. It stores the name of the surface and
 * provides some convenient way of getting values.
 *
 * @author Christian Fries
 * @version 1.0
 */
public abstract class AbstractVolatilitySurface implements VolatilitySurface, Cloneable {

	private	final	LocalDate	referenceDate;
	private final	String		name;

	protected ForwardCurve forwardCurve;
	protected DiscountCurve discountCurve;
	protected QuotingConvention quotingConvention;
	protected DayCountConvention daycountConvention;

	public AbstractVolatilitySurface(String name, LocalDate referenceDate) {
		super();
		this.name = name;
		this.referenceDate = referenceDate;
	}

	@Override
	public String getName() {
		return name;
	}

	@Override
	public LocalDate getReferenceDate() {
		return referenceDate;
	}

	@Override
	public String toString() {
		return super.toString() + "\n\"" + this.getName() + "\"";
	}

	@Override
	public Object clone() throws CloneNotSupportedException {
		return super.clone();
	}

	@Override
	public QuotingConvention getQuotingConvention() {
		return quotingConvention;
	}

	/**
	 * Convert the value of a caplet from one quoting convention to another quoting convention.
	 *
	 * @param model An analytic model providing the context when fetching required market date.
	 * @param optionMaturity Option maturity of the caplet.
	 * @param optionStrike Option strike of the caplet.
	 * @param value Value of the caplet given in the form of fromQuotingConvention.
	 * @param fromQuotingConvention The quoting convention of the given value.
	 * @param toQuotingConvention The quoting convention requested.
	 * @return Value of the caplet given in the form of toQuotingConvention.
	 */
	public double convertFromTo(AnalyticModel model, double optionMaturity, double optionStrike, double value, QuotingConvention fromQuotingConvention, QuotingConvention toQuotingConvention) {

		if(fromQuotingConvention.equals(toQuotingConvention)) {
			return value;
		}

		if(discountCurve == null) {
			throw new IllegalArgumentException("Missing discount curve. Conversion of QuotingConvention requires forward curve and discount curve to be set.");
		}
		if(forwardCurve == null) {
			throw new IllegalArgumentException("Missing forward curve. Conversion of QuotingConvention requires forward curve and discount curve to be set.");
		}

		double periodStart = optionMaturity;
		double periodEnd = periodStart + forwardCurve.getPaymentOffset(periodStart);

		double forward = forwardCurve.getForward(model, periodStart);

		double daycountFraction;
		if(daycountConvention != null) {
			LocalDate startDate = referenceDate.plusDays((int)Math.round(periodStart*365));
			LocalDate endDate   = referenceDate.plusDays((int)Math.round(periodEnd*365));
			daycountFraction = daycountConvention.getDaycountFraction(startDate, endDate);
		}
		else {
			daycountFraction = forwardCurve.getPaymentOffset(periodStart);
		}

		double payoffUnit = discountCurve.getDiscountFactor(optionMaturity+forwardCurve.getPaymentOffset(optionMaturity)) * daycountFraction;

		if(toQuotingConvention.equals(QuotingConvention.PRICE) && fromQuotingConvention.equals(QuotingConvention.VOLATILITYLOGNORMAL)) {
			return AnalyticFormulas.blackScholesGeneralizedOptionValue(forward, value, optionMaturity, optionStrike, payoffUnit);
		}
		else if(toQuotingConvention.equals(QuotingConvention.PRICE) && fromQuotingConvention.equals(QuotingConvention.VOLATILITYNORMAL)) {
			return AnalyticFormulas.bachelierOptionValue(forward, value, optionMaturity, optionStrike, payoffUnit);
		}
		else if(toQuotingConvention.equals(QuotingConvention.VOLATILITYLOGNORMAL) && fromQuotingConvention.equals(QuotingConvention.PRICE)) {
			return AnalyticFormulas.blackScholesOptionImpliedVolatility(forward, optionMaturity, optionStrike, payoffUnit, value);
		}
		else if(toQuotingConvention.equals(QuotingConvention.VOLATILITYNORMAL) && fromQuotingConvention.equals(QuotingConvention.PRICE)) {
			return AnalyticFormulas.bachelierOptionImpliedVolatility(forward, optionMaturity, optionStrike, payoffUnit, value);
		}
		else {
			return convertFromTo(model, optionMaturity, optionStrike, convertFromTo(model, optionMaturity, optionStrike, value, fromQuotingConvention, QuotingConvention.PRICE), QuotingConvention.PRICE, toQuotingConvention);
		}
	}

	/**
	 * Convert the value of a caplet from one quoting convention to another quoting convention.
	 *
	 * @param optionMaturity Option maturity of the caplet.
	 * @param optionStrike Option strike of the caplet.
	 * @param value Value of the caplet given in the form of fromQuotingConvention.
	 * @param fromQuotingConvention The quoting convention of the given value.
	 * @param toQuotingConvention The quoting convention requested.
	 * @return Value of the caplet given in the form of toQuotingConvention.
	 */
	public double convertFromTo(double optionMaturity, double optionStrike, double value, QuotingConvention fromQuotingConvention, QuotingConvention toQuotingConvention) {
		return convertFromTo(null, optionMaturity, optionStrike, value, fromQuotingConvention, toQuotingConvention);
	}
}