PiecewiseFunction.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include "Function.h"
#include "FunctionInterface.h"

class PiecewiseFunction : public Function, public FunctionInterface
{
public:
  PiecewiseFunction(const InputParameters & parameters);

  using Function::value;
  virtual Real value(Real t, const Point & p) const override;
  virtual RealVectorValue gradient(Real t, const Point & p) const override;
  virtual Real timeDerivative(Real t, const Point & p) const override;

protected:
  unsigned int getFunctionIndex(Real t, const Point & p) const;

  const unsigned int _component;
  const bool _use_time;
  const std::vector<Real> & _axis_coordinates;

  const std::vector<FunctionName> & _function_names;
  const unsigned int _n_functions;
  std::vector<const Function *> _functions;

public:
  static InputParameters validParams();
};