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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#pragma once
#include <atomic>
#include "BLI_function_ref.hh"
#include "BLI_map.hh"
#include "BLI_vector.hh"
namespace blender::ed::spreadsheet {
/**
* A generic cache for the spreadsheet. Different data sources can cache custom data using custom
* keys.
*
* Elements are removed from the cache when they are not used during a redraw.
*/
class SpreadsheetCache {
public:
class Key {
public:
virtual ~Key() = default;
mutable bool is_used = false;
virtual uint64_t hash() const = 0;
friend bool operator==(const Key &a, const Key &b)
{
return a.is_equal_to(b);
}
private:
virtual bool is_equal_to(const Key &other) const = 0;
};
class Value {
public:
virtual ~Value() = default;
};
private:
Vector<std::unique_ptr<Key>> keys_;
Map<std::reference_wrapper<const Key>, std::unique_ptr<Value>> cache_map_;
public:
/* Adding or looking up a key tags it as being used, so that it won't be removed. */
void add(std::unique_ptr<Key> key, std::unique_ptr<Value> value);
Value *lookup(const Key &key);
Value &lookup_or_add(std::unique_ptr<Key> key,
FunctionRef<std::unique_ptr<Value>()> create_value);
void set_all_unused();
void remove_all_unused();
template<typename T> T &lookup_or_add(std::unique_ptr<Key> key)
{
return dynamic_cast<T &>(
this->lookup_or_add(std::move(key), []() { return std::make_unique<T>(); }));
}
};
} // namespace blender::ed::spreadsheet
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