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/*************************************************************************
*
* Copyright 2016 Realm Inc.
*
* 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 REALM_ARRAY_BLOB_HPP
#define REALM_ARRAY_BLOB_HPP
#include <realm/array.hpp>
namespace realm {
class ArrayBlob : public Array {
public:
static constexpr size_t max_binary_size = 0xFFFFF8 - Array::header_size;
explicit ArrayBlob(Allocator&) noexcept;
~ArrayBlob() noexcept override
{
}
// Disable copying, this is not allowed.
ArrayBlob& operator=(const ArrayBlob&) = delete;
ArrayBlob(const ArrayBlob&) = delete;
const char* get(size_t index) const noexcept;
BinaryData get_at(size_t& pos) const noexcept;
bool is_null(size_t index) const noexcept;
ref_type add(const char* data, size_t data_size, bool add_zero_term = false);
void insert(size_t pos, const char* data, size_t data_size, bool add_zero_term = false);
ref_type replace(size_t begin, size_t end, const char* data, size_t data_size, bool add_zero_term = false);
void erase(size_t begin, size_t end);
/// Get the specified element without the cost of constructing an
/// array instance. If an array instance is already available, or
/// you need to get multiple values, then this method will be
/// slower.
static const char* get(const char* header, size_t index) noexcept;
/// Create a new empty blob (binary) array and attach this
/// accessor to it. This does not modify the parent reference
/// information of this accessor.
///
/// Note that the caller assumes ownership of the allocated
/// underlying node. It is not owned by the accessor.
void create();
/// Construct a blob of the specified size and return just the
/// reference to the underlying memory. All bytes will be
/// initialized to zero.
static MemRef create_array(size_t init_size, Allocator&);
void verify() const;
private:
size_t calc_byte_len(size_t for_size, size_t width) const override;
size_t calc_item_count(size_t bytes, size_t width) const noexcept override;
};
// Implementation:
// Creates new array (but invalid, call init_from_ref() to init)
inline ArrayBlob::ArrayBlob(Allocator& allocator) noexcept
: Array(allocator)
{
}
inline bool ArrayBlob::is_null(size_t index) const noexcept
{
return (get(index) == nullptr);
}
inline const char* ArrayBlob::get(size_t index) const noexcept
{
return m_data + index;
}
inline ref_type ArrayBlob::add(const char* data, size_t data_size, bool add_zero_term)
{
return replace(m_size, m_size, data, data_size, add_zero_term);
}
inline void ArrayBlob::insert(size_t pos, const char* data, size_t data_size, bool add_zero_term)
{
replace(pos, pos, data, data_size, add_zero_term);
}
inline void ArrayBlob::erase(size_t begin, size_t end)
{
const char* data = nullptr;
size_t data_size = 0;
replace(begin, end, data, data_size);
}
inline const char* ArrayBlob::get(const char* header, size_t pos) noexcept
{
const char* data = get_data_from_header(header);
return data + pos;
}
inline void ArrayBlob::create()
{
size_t init_size = 0;
MemRef mem = create_array(init_size, get_alloc()); // Throws
init_from_mem(mem);
}
inline MemRef ArrayBlob::create_array(size_t init_size, Allocator& allocator)
{
bool context_flag = false;
int_fast64_t value = 0;
return Array::create(type_Normal, context_flag, wtype_Ignore, init_size, value, allocator); // Throws
}
inline size_t ArrayBlob::calc_byte_len(size_t for_size, size_t) const
{
return header_size + for_size;
}
inline size_t ArrayBlob::calc_item_count(size_t bytes, size_t) const noexcept
{
return bytes - header_size;
}
} // namespace realm
#endif // REALM_ARRAY_BLOB_HPP
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