/**
* Copyright (C) 2013 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.analytics.financial.riskfactor;
import com.opengamma.analytics.financial.commodity.derivative.AgricultureFutureOption;
import com.opengamma.analytics.financial.commodity.derivative.EnergyFutureOption;
import com.opengamma.analytics.financial.commodity.derivative.MetalFutureOption;
import com.opengamma.analytics.financial.equity.StaticReplicationDataBundle;
import com.opengamma.analytics.financial.equity.option.EquityIndexFutureOption;
import com.opengamma.analytics.financial.equity.option.EquityIndexOption;
import com.opengamma.analytics.financial.equity.option.EquityOption;
import com.opengamma.analytics.financial.interestrate.InstrumentDerivative;
import com.opengamma.analytics.financial.interestrate.InstrumentDerivativeVisitorAdapter;
import com.opengamma.util.ArgumentChecker;
/**
* Calculates the value (or dollar) theta of an option given market data and the theta. The value theta is defined as the
* option theta multiplied by the shares per option.
*/
public final class ValueThetaCalculator implements ValueGreekCalculator {
/** Static instance */
private static final ValueThetaCalculator s_instance = new ValueThetaCalculator();
/** Calculates the multiplier for converting theta to value theta */
private static final MultiplierCalculator s_multiplierCalculator = new MultiplierCalculator();
/**
* Gets an instance of this calculator
* @return The (singleton) instance
*/
public static ValueThetaCalculator getInstance() {
return s_instance;
}
/**
* Private constructor
*/
private ValueThetaCalculator() {
}
@Override
public double valueGreek(final InstrumentDerivative derivative, final StaticReplicationDataBundle market, final double theta) {
ArgumentChecker.notNull(derivative, "derivative");
ArgumentChecker.notNull(market, "market");
return theta * derivative.accept(s_multiplierCalculator, market);
}
/**
* Calculates the multiplier for value theta - theta * shares per option
*/
private static final class MultiplierCalculator extends InstrumentDerivativeVisitorAdapter<StaticReplicationDataBundle, Double> {
/**
* Default constructor.
*/
/* package */MultiplierCalculator() {
}
@Override
public Double visitEquityIndexOption(final EquityIndexOption option, final StaticReplicationDataBundle market) {
return option.getUnitAmount();
}
@Override
public Double visitEquityOption(final EquityOption option, final StaticReplicationDataBundle market) {
return option.getUnitAmount();
}
@Override
public Double visitEquityIndexFutureOption(final EquityIndexFutureOption option, final StaticReplicationDataBundle market) {
return option.getPointValue();
}
@Override
public Double visitAgricultureFutureOption(final AgricultureFutureOption option, final StaticReplicationDataBundle market) {
return option.getUnderlying().getUnitAmount();
}
@Override
public Double visitEnergyFutureOption(final EnergyFutureOption option, final StaticReplicationDataBundle market) {
return option.getUnderlying().getUnitAmount();
}
@Override
public Double visitMetalFutureOption(final MetalFutureOption option, final StaticReplicationDataBundle market) {
return option.getUnderlying().getUnitAmount();
}
}
}