File: UnderlyingLengthChecker.h

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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UnderlyingLengthChecker_h
#define UnderlyingLengthChecker_h

#include "core/animation/InterpolableValue.h"
#include "core/animation/InterpolationType.h"
#include "wtf/PtrUtil.h"
#include <memory>

namespace blink {

class UnderlyingLengthChecker : public InterpolationType::ConversionChecker {
 public:
  static std::unique_ptr<UnderlyingLengthChecker> create(
      size_t underlyingLength) {
    return WTF::wrapUnique(new UnderlyingLengthChecker(underlyingLength));
  }

  static size_t getUnderlyingLength(const InterpolationValue& underlying) {
    if (!underlying)
      return 0;
    return toInterpolableList(*underlying.interpolableValue).length();
  }

  bool isValid(const InterpolationEnvironment&,
               const InterpolationValue& underlying) const final {
    return m_underlyingLength == getUnderlyingLength(underlying);
  }

 private:
  UnderlyingLengthChecker(size_t underlyingLength)
      : m_underlyingLength(underlyingLength) {}

  size_t m_underlyingLength;
};

}  // namespace blink

#endif  // UnderlyingLengthChecker_h