/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef DOM_SMIL_SMILNULLTYPE_H_
#define DOM_SMIL_SMILNULLTYPE_H_

#include "mozilla/SMILType.h"

namespace mozilla {

class SMILNullType : public SMILType {
 public:
  // Singleton for SMILValue objects to hold onto.
  static SMILNullType* Singleton();

 protected:
  // SMILType Methods
  // -------------------
  void InitValue(SMILValue& aValue) const override {}
  void DestroyValue(SMILValue& aValue) const override {}
  nsresult Assign(SMILValue& aDest, const SMILValue& aSrc) const override;

  // The remaining methods should never be called, so although they're very
  // simple they don't need to be inline.
  bool IsEqual(const SMILValue& aLeft, const SMILValue& aRight) const override;
  nsresult Add(SMILValue& aDest, const SMILValue& aValueToAdd,
               uint32_t aCount) const override;
  nsresult ComputeDistance(const SMILValue& aFrom, const SMILValue& aTo,
                           double& aDistance) const override;
  nsresult Interpolate(const SMILValue& aStartVal, const SMILValue& aEndVal,
                       double aUnitDistance, SMILValue& aResult) const override;

 private:
  // Private constructor: prevent instances beyond my singleton.
  constexpr SMILNullType() = default;
};

}  // namespace mozilla

#endif  // DOM_SMIL_SMILNULLTYPE_H_