ModifiedAssetsManager.h

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/*
 * Crossfire -- cooperative multi-player graphical RPG and adventure game
 *
 * Copyright (c) 2021-2022 the Crossfire Development Team
 *
 * Crossfire is free software and comes with ABSOLUTELY NO WARRANTY. You are
 * welcome to redistribute it under certain conditions. For details, please
 * see COPYING and LICENSE.
 *
 * The authors can be reached via e-mail at <crossfire@metalforge.org>.
 */
 
#ifndef MODIFIEDASSETSMANAGER_H
#define MODIFIEDASSETSMANAGER_H
 
#include <set>
#include <algorithm>
#include "AssetWriter.h"
#include <QFile>
 
template<class T>
class ModifiedAssetsManager {
public:
    ModifiedAssetsManager(AssetWriter<T> *writer) : myWriter(writer) { }
    virtual ~ModifiedAssetsManager() { delete myWriter; }
 
    const std::map<std::string, std::set<const T*> >& origins() const { return myOrigins; }
 
    std::vector<std::string> files() const {
        std::vector<std::string> files;
        for (const auto &origin : myOrigins) {
            files.push_back(origin.first);
        }
        return files;
    }
 
    std::string originOf(const T *asset) const {
        for (auto file : myOrigins) {
            if (file.second.count(asset) > 0) {
                return file.first;
            }
        }
        return std::string();
    }
 
    void assetDefined(const T *asset, const std::string &filename) {
        for (auto it : myOrigins) {
            it.second.erase(asset);
        }
        myOrigins[filename.c_str()].insert(asset);
    }
 
    void assetModified(T *asset) { myDirty.insert(asset); }
 
    void saveModifiedAssets() {
      for (auto a : myDirty) {
          for (auto file : myOrigins) {
              if (file.second.count(a) > 0) {
                  write(file.first, file.second);
              }
          }
      }
 
      myDirty.clear();
    }
 
    bool hasPendingChanges() const { return !myDirty.empty(); }
 
    std::vector<T *> dirtyAssetsWithNoOrigin() const {
        std::vector<T *> assets;
        std::copy_if(myDirty.cbegin(), myDirty.cend(), std::back_inserter(assets), [this] (const auto &dirty) {
            return this->originOf(dirty).empty();
        });
        return assets;
    }
 
protected:
      void write(const std::string &filename, std::set<const T*> assets) {
          auto buf = stringbuffer_new();
          for (auto asset = assets.begin(); asset != assets.end(); asset++) {
              myWriter->write(*asset, buf);
          }
 
          size_t length = stringbuffer_length(buf);
          char *data = stringbuffer_finish(buf);
 
          QFile out(QString(filename.data()));
          out.open(QIODevice::WriteOnly);
          out.write(data, length);
          free(data);
      }
 
private:
    AssetWriter<T> *myWriter;
    std::map<std::string, std::set<const T*> > myOrigins;
    std::set<T *> myDirty;
};
 
#endif /* MODIFIEDASSETSMANAGER_H */