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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_CSSOM_TRANSFORM_FUNCTION_VISITOR_H_
#define COBALT_CSSOM_TRANSFORM_FUNCTION_VISITOR_H_
namespace cobalt {
namespace cssom {
class MatrixFunction;
class RotateFunction;
class ScaleFunction;
class TranslateFunction;
// Type-safe branching on a class hierarchy of transform functions,
// implemented after a classical GoF pattern (see
// http://en.wikipedia.org/wiki/Visitor_pattern#Java_example).
class TransformFunctionVisitor {
public:
virtual void VisitMatrix(const MatrixFunction* matrix_function) = 0;
virtual void VisitRotate(const RotateFunction* rotate_function) = 0;
virtual void VisitScale(const ScaleFunction* scale_function) = 0;
virtual void VisitTranslate(const TranslateFunction* translate_function) = 0;
protected:
~TransformFunctionVisitor() {}
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_TRANSFORM_FUNCTION_VISITOR_H_