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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_STRING_HPP
#define REALM_ARRAY_STRING_HPP
#include <realm/array_string_short.hpp>
#include <realm/array_blobs_small.hpp>
#include <realm/array_blobs_big.hpp>
namespace realm {
class Spec;
class ArrayString : public ArrayPayload {
public:
using value_type = StringData;
explicit ArrayString(Allocator&);
static StringData default_value(bool nullable)
{
return nullable ? StringData{} : StringData{""};
}
// This is only used in the upgrade process
void set_nullability(bool n)
{
m_nullable = n;
}
void create();
bool is_attached() const
{
return m_arr->is_attached();
}
ref_type get_ref() const
{
return m_arr->get_ref();
}
ArrayParent* get_parent() const
{
return m_arr->get_parent();
}
size_t get_ndx_in_parent() const
{
return m_arr->get_ndx_in_parent();
}
void set_parent(ArrayParent* p, size_t n) noexcept override
{
m_arr->set_parent(p, n);
}
bool need_spec() const override
{
return true;
}
void set_spec(Spec* spec, size_t col_ndx) const override
{
m_spec = spec;
m_col_ndx = col_ndx;
}
void update_parent()
{
m_arr->update_parent();
}
void init_from_mem(MemRef mem) noexcept;
void init_from_ref(ref_type ref) noexcept override
{
init_from_mem(MemRef(m_alloc.translate(ref), ref, m_alloc));
}
void init_from_parent();
void destroy() noexcept;
void detach() noexcept;
size_t size() const;
void add(StringData value);
void set(size_t ndx, StringData value);
void set_null(size_t ndx)
{
set(ndx, StringData{});
}
void insert(size_t ndx, StringData value);
StringData get(size_t ndx) const;
StringData get_legacy(size_t ndx) const;
Mixed get_any(size_t ndx) const override;
bool is_null(size_t ndx) const;
void erase(size_t ndx);
void move(ArrayString& dst, size_t ndx);
void clear();
size_t find_first(StringData value, size_t begin, size_t end) const noexcept;
size_t lower_bound(StringData value);
/// 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 StringData get(const char* header, size_t ndx, Allocator& alloc) noexcept;
void verify() const;
private:
static constexpr size_t small_string_max_size = 15; // ArrayStringShort
static constexpr size_t medium_string_max_size = 63; // ArrayStringLong
union Storage {
std::aligned_storage<sizeof(ArrayStringShort), alignof(ArrayStringShort)>::type m_string_short;
std::aligned_storage<sizeof(ArraySmallBlobs), alignof(ArraySmallBlobs)>::type m_string_long;
std::aligned_storage<sizeof(ArrayBigBlobs), alignof(ArrayBigBlobs)>::type m_big_blobs;
std::aligned_storage<sizeof(Array), alignof(Array)>::type m_enum;
};
enum class Type { small_strings, medium_strings, big_strings, enum_strings };
Type m_type = Type::small_strings;
Allocator& m_alloc;
Storage m_storage;
Array* m_arr;
mutable Spec* m_spec = nullptr;
mutable size_t m_col_ndx = realm::npos;
bool m_nullable = true;
std::unique_ptr<ArrayString> m_string_enum_values;
Type upgrade_leaf(size_t value_size);
};
inline StringData ArrayString::get(const char* header, size_t ndx, Allocator& alloc) noexcept
{
bool long_strings = Array::get_hasrefs_from_header(header);
if (!long_strings) {
return ArrayStringShort::get(header, ndx, true);
}
else {
bool is_big = Array::get_context_flag_from_header(header);
if (!is_big) {
return ArraySmallBlobs::get_string(header, ndx, alloc);
}
else {
return ArrayBigBlobs::get_string(header, ndx, alloc);
}
}
}
}
#endif /* REALM_ARRAY_STRING_HPP */
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