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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. 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.
+ */
+
+/**
+ * @file        ConstView.h
+ * @brief       This file contains ConstView class
+ * @ingroup     COM_AI_RUNTIME
+ */
+
+#ifndef __INTERNAL_NNAPI_TENSOR_CONST_VIEW_H__
+#define __INTERNAL_NNAPI_TENSOR_CONST_VIEW_H__
+
+#include "util/tensor/Shape.h"
+#include "util/tensor/Index.h"
+
+namespace internal
+{
+namespace nnapi
+{
+namespace tensor
+{
+
+/**
+ * @brief Wrapper class to read tensor values
+ * @tparam T The tensor element type
+ */
+template <typename T> class ConstView
+{
+public:
+ /**
+ * @brief Construct a ConstView class
+ * @param[in] shape Tensor shape
+ * @param[in] ptr The base pointer of actual data
+ * @param[in] len The number of bytes
+ */
+ ConstView(const ::nnfw::misc::tensor::Shape &shape, const uint8_t *ptr, size_t len)
+ : _shape{shape}, _ptr{ptr}, _len{len}
+ {
+ // DO NOTHING
+ }
+
+public:
+ const nnfw::misc::tensor::Shape &shape(void) const { return _shape; }
+
+private:
+ // TODO Make this as a helper function, and share it for both View<T> and ConstView<T>
+ /**
+ * @brief Calculate offset for the given tensor index
+ * @param[in] index Tensor index
+ * @return The calculated offset
+ */
+ uint32_t offset_of(const nnfw::misc::tensor::Index &index) const
+ {
+ if (_shape.rank() == 0)
+ {
+ return 0;
+ }
+
+ uint32_t offset = index.at(0);
+
+ // Stride decreases as axis increases in NNAPI
+ for (uint32_t axis = 1; axis < _shape.rank(); ++axis)
+ {
+ offset *= _shape.dim(axis);
+ offset += index.at(axis);
+ }
+
+ return offset;
+ }
+
+public:
+ /**
+ * @brief Get the value on the given index
+ * @param[in] index Flattened tensor index
+ * @return The value on the given index
+ */
+ T at(const nnfw::misc::tensor::Index &index) const
+ {
+ const auto offset = offset_of(index);
+
+ const T *arr = reinterpret_cast<const T *>(_ptr);
+
+ return arr[offset];
+ }
+
+private:
+ const nnfw::misc::tensor::Shape _shape;
+
+private:
+ const uint8_t *const _ptr;
+ const size_t _len;
+};
+
+} // namespace tensor
+} // namespace nnapi
+} // namespace internal
+
+#endif // __INTERNAL_NNAPI_TENSOR_CONST_VIEW_H__