/**
* Copyright (C) 2012 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.financial.analytics.model.equity;
import java.util.Collections;
import java.util.Set;
import com.opengamma.analytics.financial.equity.variance.pricing.AffineDividends;
import com.opengamma.engine.ComputationTarget;
import com.opengamma.engine.function.AbstractFunction;
import com.opengamma.engine.function.FunctionCompilationContext;
import com.opengamma.engine.function.FunctionExecutionContext;
import com.opengamma.engine.function.FunctionInputs;
import com.opengamma.engine.target.ComputationTargetType;
import com.opengamma.engine.value.ComputedValue;
import com.opengamma.engine.value.ValueProperties;
import com.opengamma.engine.value.ValueRequirement;
import com.opengamma.engine.value.ValueRequirementNames;
import com.opengamma.engine.value.ValueSpecification;
import com.opengamma.util.async.AsynchronousExecution;
/**
* Dividend payments (per share) at discrete times $\tau_i$ of the form $\alpha_i + \beta_iS_{\tau_{i^-}}$ where $S_{\tau_{i^-}}$ is the stock price immediately before the
* dividend payment.<p>
*
* This is a toy model. It takes static values..
* From these, we construct a model which pays fixed amounts for the first year, and amounts proportional to the share price thereafter
*/
public class AffineDividendFunction extends AbstractFunction.NonCompiledInvoker {
private static final double[] TAU = new double[] {0.25, 0.5, 0.75, 1, 2, 3, 4};
private static final double[] ALPHA = new double[] {0.23, 0.24, 0.25, 0.26, 0, 0, 0};
private static final double[] BETA = new double[] {0, 0, 0, 0, 0.15, 0.2, 0.3};
@Override
public Set<ComputedValue> execute(final FunctionExecutionContext executionContext, final FunctionInputs inputs, final ComputationTarget target,
final Set<ValueRequirement> desiredValues) throws AsynchronousExecution {
final AffineDividends dividends = new AffineDividends(TAU, ALPHA, BETA);
final ValueProperties properties = createValueProperties().get();
final ValueSpecification spec = new ValueSpecification(ValueRequirementNames.AFFINE_DIVIDENDS, target.toSpecification(), properties);
return Collections.singleton(new ComputedValue(spec, dividends));
}
@Override
public ComputationTargetType getTargetType() {
return ComputationTargetType.NULL;
}
@Override
public Set<ValueSpecification> getResults(final FunctionCompilationContext context, final ComputationTarget target) {
final ValueProperties properties = createValueProperties().get();
return Collections.singleton(new ValueSpecification(ValueRequirementNames.AFFINE_DIVIDENDS, target.toSpecification(), properties));
}
@Override
public Set<ValueRequirement> getRequirements(final FunctionCompilationContext context, final ComputationTarget target, final ValueRequirement desiredValue) {
return Collections.emptySet();
}
}