91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
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// repository_manager.h
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#ifndef REPOSITORY_MANAGER_H
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#define REPOSITORY_MANAGER_H
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#include "repository_interface.h"
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#include <QMap>
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#include <QSqlDatabase>
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// The repository manager inherits the QObject class to delete child objects
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class RepositoryManager : public QObject {
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Q_OBJECT
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private:
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// Database connection
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QSqlDatabase database_;
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// Map of repository names to instances
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QMap<QString, RepositoryInterface *> repositories_;
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public:
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// Singleton instance accessor
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static RepositoryManager &instance();
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// Get a repository by name
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RepositoryInterface *getRepository(const QString &repositoryTableName) const;
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// Get a repository by name and type
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template <typename T>
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T *getRepositoryAs(const QString &repositoryTableName) const;
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private:
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// Register a new repository
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template <typename T>
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bool registerRepository(const QString &repositoryTableName);
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// Initialize repositories
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void initialize();
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// Private constructor for singleton
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RepositoryManager();
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// Destructor to clean up resources
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~RepositoryManager();
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// Delete copy constructor
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RepositoryManager(const RepositoryManager &) = delete;
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// Delete assignment operator
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RepositoryManager &operator=(const RepositoryManager &) = delete;
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};
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// NOTE: Implementation of template methods
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template <typename T>
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T *RepositoryManager::getRepositoryAs(
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const QString &repositoryTableName) const {
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auto *repository = dynamic_cast<T *>(getRepository(repositoryTableName));
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if (!repository) {
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qFatal() << "Failed to downcast repository for" << repositoryTableName
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<< "(typeid name):" << typeid(T).name();
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return nullptr;
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}
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qInfo() << "Successfully downcast repository for" << repositoryTableName;
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return repository;
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}
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template <typename T>
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bool RepositoryManager::registerRepository(const QString &repositoryTableName) {
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static_assert(
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std::is_constructible<T, QSqlDatabase &, QObject *>::value,
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"Repository class must have a constructor accepting QSqlDatabase& and "
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"QObject*");
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if (repositories_.contains(repositoryTableName)) {
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qInfo() << "Repository" << repositoryTableName << "is already registered";
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return true;
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}
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auto *repository = new T(database_, this); // Qt will delete the model
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repository->setObjectName(repositoryTableName);
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repositories_.insert(repositoryTableName, repository);
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qInfo() << "Repository" << repositoryTableName
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<< "was registered successfully";
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return true;
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}
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#endif // REPOSITORY_MANAGER_H
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