/**
* Copyright (C) 2012 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.analytics.financial.model.volatility.smile.fitting.sabr;
import java.util.Arrays;
import org.apache.commons.lang.ObjectUtils;
import com.opengamma.analytics.financial.model.interestrate.curve.ForwardCurve;
import com.opengamma.analytics.financial.model.option.definition.SmileDeltaParameters;
import com.opengamma.analytics.math.curve.InterpolatedDoublesCurve;
import com.opengamma.analytics.math.interpolation.CombinedInterpolatorExtrapolator;
import com.opengamma.util.ArgumentChecker;
/**
*
*/
public class ForexSmileDeltaSurfaceDataBundle extends SmileSurfaceDataBundle {
private final double[] _forwards;
private final double[] _expiries;
private final double[][] _strikes;
private final double[][] _vols;
private final ForwardCurve _forwardCurve;
private final int _nExpiries;
private final boolean _isCallData;
public ForexSmileDeltaSurfaceDataBundle(final double[] forwards, final double[] expiries, final double[] deltas, final double[] atms, final double[][] riskReversals,
final double[][] strangle, final boolean isCallData, final CombinedInterpolatorExtrapolator interpolator) {
ArgumentChecker.notNull(deltas, "delta");
ArgumentChecker.notNull(forwards, "forwards");
ArgumentChecker.notNull(expiries, "expiries");
ArgumentChecker.notNull(atms, "at-the-money");
ArgumentChecker.notNull(riskReversals, "risk reversal");
ArgumentChecker.notNull(strangle, "strangle");
_nExpiries = expiries.length;
ArgumentChecker.isTrue(_nExpiries == forwards.length, "forwards wrong length; have {}, need {}", forwards.length, _nExpiries);
ArgumentChecker.isTrue(_nExpiries == atms.length, "atms wrong length; have {}, need {}", atms.length, _nExpiries);
final int n = deltas.length;
ArgumentChecker.isTrue(n > 0, "need at least one delta");
ArgumentChecker.isTrue(n == riskReversals.length, "wrong number of rr sets; have {}, need {}", riskReversals.length, n);
ArgumentChecker.isTrue(n == strangle.length, "wrong number of strangle sets; have {}, need {}", strangle.length, n);
for (int i = 0; i < n; i++) {
ArgumentChecker.isTrue(_nExpiries == riskReversals[i].length, "wrong number of rr; have {}, need {}", riskReversals[i].length, _nExpiries);
ArgumentChecker.isTrue(_nExpiries == strangle[i].length, "wrong number of strangles; have {}, need {}", strangle[i].length, _nExpiries);
}
_forwards = forwards;
_expiries = expiries;
_forwardCurve = new ForwardCurve(InterpolatedDoublesCurve.from(_expiries, _forwards, interpolator));
_strikes = new double[_nExpiries][];
_vols = new double[_nExpiries][];
for (int i = 0; i < _nExpiries; i++) {
final double[] rr = new double[n];
final double[] s = new double[n];
for (int j = 0; j < n; j++) {
rr[j] = riskReversals[j][i];
s[j] = strangle[j][i];
}
final SmileDeltaParameters cal = new SmileDeltaParameters(_expiries[i], atms[i], deltas, rr, s);
_strikes[i] = cal.getStrike(_forwards[i]);
_vols[i] = cal.getVolatility();
}
_isCallData = isCallData;
checkVolatilities(expiries, _vols);
}
public ForexSmileDeltaSurfaceDataBundle(final ForwardCurve forwardCurve, final double[] expiries, final double[] deltas, final double[] atms, final double[][] riskReversals,
final double[][] strangle, final boolean isCallData) {
ArgumentChecker.notNull(deltas, "delta");
ArgumentChecker.notNull(forwardCurve, "forward curve");
ArgumentChecker.notNull(expiries, "expiries");
ArgumentChecker.notNull(atms, "atms");
ArgumentChecker.notNull(riskReversals, "risk reversals");
ArgumentChecker.notNull(strangle, "strangle");
_nExpiries = expiries.length;
ArgumentChecker.isTrue(_nExpiries == atms.length, "atms wrong length; have {}, need {}", atms.length, _nExpiries);
final int n = deltas.length;
ArgumentChecker.isTrue(n > 0, "need at least one delta");
ArgumentChecker.isTrue(n == riskReversals.length, "wrong number of rr sets; have {}, need {}", riskReversals.length, n);
ArgumentChecker.isTrue(n == strangle.length, "wrong number of strangle sets; have {}, need {}", strangle.length, n);
for (int i = 0; i < n; i++) {
ArgumentChecker.isTrue(_nExpiries == riskReversals[i].length, "wrong number of rr; have {}, need {}", riskReversals[i].length, _nExpiries);
ArgumentChecker.isTrue(_nExpiries == strangle[i].length, "wrong number of strangles; have {}, need {}", strangle[i].length, _nExpiries);
}
_forwards = new double[_nExpiries];
_expiries = expiries;
_forwardCurve = forwardCurve;
_strikes = new double[_nExpiries][];
_vols = new double[_nExpiries][];
for (int i = 0; i < _nExpiries; i++) {
_forwards[i] = forwardCurve.getForward(_expiries[i]);
final double[] rr = new double[n];
final double[] s = new double[n];
for (int j = 0; j < n; j++) {
rr[j] = riskReversals[j][i];
s[j] = strangle[j][i];
}
final SmileDeltaParameters cal = new SmileDeltaParameters(_expiries[i], atms[i], deltas, rr, s);
_strikes[i] = cal.getStrike(_forwards[i]);
_vols[i] = cal.getVolatility();
}
_isCallData = isCallData;
checkVolatilities(expiries, _vols);
}
public ForexSmileDeltaSurfaceDataBundle(final ForwardCurve forwardCurve, final double[] expiries, final double[][] strikes, final double[][] vols, final boolean isCallData) {
ArgumentChecker.notNull(forwardCurve, "forward curve");
ArgumentChecker.notNull(expiries, "expiries");
ArgumentChecker.notNull(strikes, "strikes");
ArgumentChecker.notNull(vols, "vols");
_nExpiries = expiries.length;
ArgumentChecker.isTrue(_nExpiries == strikes.length, "strikes wrong length; have {}, need {}", strikes.length, _nExpiries);
ArgumentChecker.isTrue(_nExpiries == vols.length, "implied vols wrong length; have {}, need {}", vols.length, _nExpiries);
for (int i = 0; i < _nExpiries; i++) {
ArgumentChecker.isTrue(strikes[i].length == vols[i].length, "wrong number of volatilities; have {}, need {}", strikes[i].length, vols[i].length);
}
_forwardCurve = forwardCurve;
_expiries = expiries;
_strikes = strikes;
_vols = vols;
_forwards = new double[_nExpiries];
for (int i = 0; i < _nExpiries; i++) {
_forwards[i] = forwardCurve.getForward(expiries[i]);
}
_isCallData = isCallData;
}
@Override
public int getNumExpiries() {
return _nExpiries;
}
@Override
public double[] getExpiries() {
return _expiries;
}
@Override
public double[][] getStrikes() {
return _strikes;
}
@Override
public double[][] getVolatilities() {
return _vols;
}
@Override
public double[] getForwards() {
return _forwards;
}
@Override
public ForwardCurve getForwardCurve() {
return _forwardCurve;
}
@Override
public SmileSurfaceDataBundle withBumpedPoint(final int expiryIndex, final int strikeIndex, final double amount) {
ArgumentChecker.isTrue(ArgumentChecker.isInRangeExcludingHigh(0, _nExpiries, expiryIndex), "Invalid index for expiry; {}", expiryIndex);
final double[][] strikes = getStrikes();
ArgumentChecker.isTrue(ArgumentChecker.isInRangeExcludingHigh(0, strikes[expiryIndex].length, strikeIndex), "Invalid index for strike; {}", strikeIndex);
final int nStrikes = strikes[expiryIndex].length;
final double[][] vols = new double[_nExpiries][];
for (int i = 0; i < _nExpiries; i++) {
vols[i] = new double[nStrikes];
System.arraycopy(_vols[i], 0, vols[i], 0, nStrikes);
}
vols[expiryIndex][strikeIndex] += amount;
return new ForexSmileDeltaSurfaceDataBundle(getForwardCurve(), getExpiries(), getStrikes(), vols, _isCallData);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + _forwardCurve.hashCode();
result = prime * result + Arrays.deepHashCode(_vols);
result = prime * result + Arrays.deepHashCode(_strikes);
result = prime * result + Arrays.hashCode(_expiries);
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final ForexSmileDeltaSurfaceDataBundle other = (ForexSmileDeltaSurfaceDataBundle) obj;
if (!ObjectUtils.equals(_forwardCurve, other._forwardCurve)) {
return false;
}
if (!Arrays.equals(_expiries, other._expiries)) {
return false;
}
for (int i = 0; i < _nExpiries; i++) {
if (!Arrays.equals(_strikes[i], other._strikes[i])) {
return false;
}
if (!Arrays.equals(_vols[i], other._vols[i])) {
return false;
}
}
return true;
}
}