/**
* Copyright (C) 2013 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.financial.analytics.model.futureoption;
import java.util.Collections;
import java.util.Set;
import com.opengamma.OpenGammaRuntimeException;
import com.opengamma.analytics.financial.equity.StaticReplicationDataBundle;
import com.opengamma.analytics.financial.interestrate.InstrumentDerivative;
import com.opengamma.analytics.financial.riskfactor.ValueThetaCalculator;
import com.opengamma.engine.ComputationTarget;
import com.opengamma.engine.ComputationTargetSpecification;
import com.opengamma.engine.function.FunctionCompilationContext;
import com.opengamma.engine.function.FunctionInputs;
import com.opengamma.engine.value.ComputedValue;
import com.opengamma.engine.value.ValueProperties;
import com.opengamma.engine.value.ValuePropertyNames;
import com.opengamma.engine.value.ValueRequirement;
import com.opengamma.engine.value.ValueRequirementNames;
import com.opengamma.engine.value.ValueSpecification;
/**
* Calculates the value theta of an equity index future option using the Black theta.
*/
public class EquityFutureOptionBlackValueThetaFunction extends EquityFutureOptionBlackFunction {
/** Value theta calculator */
private static final ValueThetaCalculator CALCULATOR = ValueThetaCalculator.getInstance();
/**
* Sets the value requirement name to {@link ValueRequirementNames#VALUE_THETA}
*/
public EquityFutureOptionBlackValueThetaFunction() {
super(ValueRequirementNames.VALUE_THETA);
}
@Override
protected Set<ComputedValue> computeValues(final InstrumentDerivative derivative, final StaticReplicationDataBundle market, final FunctionInputs inputs,
final Set<ValueRequirement> desiredValues, final ComputationTargetSpecification targetSpec, final ValueProperties resultProperties) {
final ValueSpecification resultSpec = new ValueSpecification(getValueRequirementNames()[0], targetSpec, resultProperties);
final Object thetaObject = inputs.getValue(ValueRequirementNames.THETA);
if (thetaObject == null) {
throw new OpenGammaRuntimeException("Could not get theta");
}
final double theta = (Double) thetaObject;
final double valueTheta = CALCULATOR.valueGreek(derivative, market, theta);
return Collections.singleton(new ComputedValue(resultSpec, valueTheta));
}
@Override
public Set<ValueRequirement> getRequirements(final FunctionCompilationContext context, final ComputationTarget target, final ValueRequirement desiredValue) {
final Set<ValueRequirement> requirements = super.getRequirements(context, target, desiredValue);
if (requirements == null) {
return null;
}
final ValueProperties properties = desiredValue.getConstraints().copy()
.withoutAny(ValuePropertyNames.CURRENCY)
.get();
requirements.add(new ValueRequirement(ValueRequirementNames.THETA, target.toSpecification(), properties));
return requirements;
}
}