mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 19:32:45 +00:00
224804b424
Unfortunately this patch is quite large. The main functionality included are a BTree index implementation and the Heap class which manages persistent storage. Also included are a Key subclass of the Tuple class, which is a specialization for index key tuples. This "dragged in" the Meta layer, which has classes defining SQL objects like tables and indexes.
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/*
|
|
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <LibCore/Object.h>
|
|
#include <LibSQL/Forward.h>
|
|
#include <LibSQL/Meta.h>
|
|
|
|
namespace SQL {
|
|
|
|
class IndexNode {
|
|
public:
|
|
virtual ~IndexNode() = default;
|
|
[[nodiscard]] u32 pointer() const { return m_pointer; }
|
|
virtual void serialize(ByteBuffer&) const = 0;
|
|
virtual IndexNode* as_index_node() = 0;
|
|
|
|
protected:
|
|
explicit IndexNode(u32 pointer)
|
|
: m_pointer(pointer)
|
|
{
|
|
}
|
|
|
|
void set_pointer(u32 pointer) { m_pointer = pointer; }
|
|
|
|
private:
|
|
u32 m_pointer;
|
|
};
|
|
|
|
class Index : public Core::Object {
|
|
C_OBJECT_ABSTRACT(Index);
|
|
|
|
public:
|
|
~Index() override = default;
|
|
|
|
TupleDescriptor descriptor() const { return m_descriptor; }
|
|
[[nodiscard]] bool duplicates_allowed() const { return !m_unique; }
|
|
[[nodiscard]] bool unique() const { return m_unique; }
|
|
[[nodiscard]] u32 pointer() const { return m_pointer; }
|
|
|
|
protected:
|
|
Index(Heap& heap, TupleDescriptor const&, bool unique, u32 pointer);
|
|
Index(Heap& heap, TupleDescriptor const&, u32 pointer);
|
|
|
|
[[nodiscard]] Heap const& heap() const { return m_heap; }
|
|
[[nodiscard]] Heap& heap() { return m_heap; }
|
|
void set_pointer(u32 pointer) { m_pointer = pointer; }
|
|
u32 new_record_pointer() { return m_heap.new_record_pointer(); }
|
|
ByteBuffer read_block(u32);
|
|
void add_to_write_ahead_log(IndexNode*);
|
|
|
|
private:
|
|
Heap& m_heap;
|
|
TupleDescriptor m_descriptor;
|
|
bool m_unique { false };
|
|
u32 m_pointer { 0 };
|
|
};
|
|
|
|
}
|