/**
* Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.analytics.financial.model.finitedifference;
import org.apache.commons.lang.Validate;
import com.opengamma.analytics.math.surface.ConstantDoublesSurface;
import com.opengamma.analytics.math.surface.Surface;
/**
*
*/
public class NeumannBoundaryCondition2D implements BoundaryCondition2D {
private final Surface<Double, Double, Double> _f;
private final double _level;
public NeumannBoundaryCondition2D(final Surface<Double, Double, Double> boundaryFirstDeriviative, double boundaryLevel) {
Validate.notNull(boundaryFirstDeriviative, "boundaryValue ");
_f = boundaryFirstDeriviative;
_level = boundaryLevel;
}
public NeumannBoundaryCondition2D(final double boundaryFirstDeriviative, double boundaryLevel) {
_f = ConstantDoublesSurface.from(boundaryFirstDeriviative);
_level = boundaryLevel;
}
@Override
public double getConstant(double t, double boundaryPosition, double gridSpacing) {
return _f.getZValue(t, boundaryPosition) * gridSpacing;
}
@Override
public double[] getLeftMatrixCondition(double t, double boundaryPosition) {
return new double[] {-1, 1 };
}
@Override
public double getLevel() {
return _level;
}
@Override
public double[] getRightMatrixCondition(double t, double boundaryPosition) {
return new double[0];
}
}