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function KeyPath(): PropertyDecorator {
return (target: Object, propertyKey: string | symbol) => {
const constructor = target.constructor as Function;
const existing = Reflect.getMetadata("keypath", constructor) || [];
Reflect.defineMetadata("keypath", [...existing, propertyKey as string], constructor);
};
}
function Index(): PropertyDecorator {
return (target: Object, propertyKey: string | symbol) => {
const constructor = target.constructor as Function;
const existing = Reflect.getMetadata("indexes", constructor) || [];
Reflect.defineMetadata("indexes", [...existing, propertyKey as string], constructor);
};
}
function DataClass(): ClassDecorator {
return (target: Function) => {
if (!Reflect.getMetadata("keypath", target)) {
throw new Error(`No keypath field defined for the class ${target.name}.`);
}
const keyPathFields = Reflect.getMetadata("keypath", target) || [];
if (keyPathFields.length > 1) {
throw new Error(`Only one keypath field can be defined for the class ${target.name}.`);
}
Reflect.defineMetadata("dataclass", true, target);
};
}
interface EntityRepository<T> {
create(item: T): Promise<void>;
read(key: string): Promise<T | undefined>;
update(item: T): Promise<void>;
delete(key: string): Promise<void>;
list(): Promise<T[]>;
listPaginated(page: number, pageSize: number): Promise<T[]>;
findByIndex(indexName: string, value: any): Promise<T[]>;
findOneByIndex(indexName: string, value: any): Promise<T | undefined>;
count(): Promise<number>;
exists(key: string): Promise<boolean>;
clear(): Promise<void>;
}
type DatabaseWithRepositories<T extends Record<string, any>> = Database & T;
class Database {
private dbName: string;
private classes: Function[];
private db: IDBDatabase | null = null;
private entityRepositories: Map<string, any> = new Map();
private constructor(dbName: string, classes: Function[]) {
this.dbName = dbName;
if (!classes.every(cls => Reflect.getMetadata("dataclass", cls))) {
throw new Error("All classes should be decorated with @DataClass.");
}
this.classes = classes;
}
public static async build<T extends Record<string, EntityRepository<any>>>(
dbName: string,
classes: Function[]
): Promise<DatabaseWithRepositories<T>> {
const instance = new Database(dbName, classes) as any;
await instance.initDB();
instance.generateEntityRepositories();
return instance as DatabaseWithRepositories<T>;
}
private async initDB(): Promise<void> {
return new Promise((resolve, reject) => {
const request = indexedDB.open(this.dbName, 1);
request.onupgradeneeded = () => {
const db = request.result;
this.classes.forEach((cls) => {
const keyPathFields = Reflect.getMetadata("keypath", cls) || [];
const indexFields = Reflect.getMetadata("indexes", cls) || [];
const storeName = cls.name.toLowerCase();
Eif (!db.objectStoreNames.contains(storeName)) {
const store = db.createObjectStore(storeName, { keyPath: keyPathFields[0] });
indexFields.forEach((indexField: string) => {
Eif (!store.indexNames.contains(indexField)) {
store.createIndex(indexField, indexField, { unique: false });
}
});
}
});
};
request.onsuccess = () => {
this.db = request.result;
console.debug(`Database initialized with object stores for: ${this.classes.map(cls => cls.name).join(", ")}`);
resolve();
};
request.onerror = () => {
console.error("Error initializing database:", request.error);
reject(request.error);
};
});
}
private generateEntityRepositories(): void {
this.classes.forEach(cls => {
const entityName = cls.name;
const repository = this.createEntityRepository(cls);
// repo name, internal use
this.entityRepositories.set(entityName, repository);
// Dynamically add the repository as a property on the database instance
Object.defineProperty(this, entityName, {
value: repository,
writable: false,
enumerable: true,
configurable: false
});
});
}
private createEntityRepository<T>(cls: Function): EntityRepository<T> {
return {
create: async (item: T): Promise<void> => {
return this.performOperation(cls.name, 'readwrite', (store) => {
const request = store.add(item);
return new Promise<void>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Item added to ${cls.name}:`, item);
resolve();
};
request.onerror = () => reject(request.error);
});
});
},
read: async (key: string): Promise<T | undefined> => {
return this.performOperation(cls.name, 'readonly', (store) => {
const request = store.get(key);
return new Promise<T | undefined>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Item read from ${cls.name}:`, request.result);
resolve(request.result as T | undefined);
};
request.onerror = () => reject(request.error);
});
});
},
update: async (item: T): Promise<void> => {
return this.performOperation(cls.name, 'readwrite', (store) => {
const request = store.put(item);
return new Promise<void>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Item updated in ${cls.name}:`, item);
resolve();
};
request.onerror = () => reject(request.error);
});
});
},
delete: async (key: string): Promise<void> => {
return this.performOperation(cls.name, 'readwrite', (store) => {
const request = store.delete(key);
return new Promise<void>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Item deleted from ${cls.name}:`, key);
resolve();
};
request.onerror = () => reject(request.error);
});
});
},
list: async (): Promise<T[]> => {
return this.performOperation(cls.name, 'readonly', (store) => {
const request = store.getAll();
return new Promise<T[]>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`All items from ${cls.name}:`, request.result);
resolve(request.result as T[]);
};
request.onerror = () => reject(request.error);
});
});
},
listPaginated: async (page: number, pageSize: number): Promise<T[]> => {
return this.performOperation(cls.name, 'readonly', (store) => {
const request = store.getAll();
return new Promise<T[]>((resolve, reject) => {
request.onsuccess = () => {
const items = request.result as T[];
const paginatedItems = items.slice((page - 1) * pageSize, page * pageSize);
console.debug(`Paginated items from ${cls.name}:`, paginatedItems);
resolve(paginatedItems);
};
request.onerror = () => reject(request.error);
});
});
},
findByIndex: async (indexName: string, value: any): Promise<T[]> => {
return this.performOperation(cls.name, 'readonly', (store) => {
if (!store.indexNames.contains(indexName)) {
throw new Error(`Index '${indexName}' does not exist on ${cls.name}`);
}
const index = store.index(indexName);
const request = index.getAll(value);
return new Promise<T[]>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Items found by index ${indexName} with value ${value}:`, request.result);
resolve(request.result as T[]);
};
request.onerror = () => reject(request.error);
});
});
},
findOneByIndex: async (indexName: string, value: any): Promise<T | undefined> => {
return this.performOperation(cls.name, 'readonly', (store) => {
if (!store.indexNames.contains(indexName)) {
throw new Error(`Index '${indexName}' does not exist on ${cls.name}`);
}
const index = store.index(indexName);
const request = index.get(value);
return new Promise<T | undefined>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Item found by index ${indexName} with value ${value}:`, request.result);
resolve(request.result as T | undefined);
};
request.onerror = () => reject(request.error);
});
});
},
count: async (): Promise<number> => {
return this.performOperation(cls.name, 'readonly', (store) => {
const request = store.count();
return new Promise<number>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Count for ${cls.name}:`, request.result);
resolve(request.result);
};
request.onerror = () => reject(request.error);
});
});
},
exists: async (key: string): Promise<boolean> => {
return this.performOperation(cls.name, 'readonly', (store) => {
const request = store.count(key);
return new Promise<boolean>((resolve, reject) => {
request.onsuccess = () => {
const exists = request.result > 0;
console.debug(`Exists check for ${cls.name} with key ${key}:`, exists);
resolve(exists);
};
request.onerror = () => reject(request.error);
});
});
},
clear: async (): Promise<void> => {
return this.performOperation(cls.name, 'readwrite', (store) => {
const request = store.clear();
return new Promise<void>((resolve, reject) => {
request.onsuccess = () => {
console.debug(`Cleared all items from ${cls.name}`);
resolve();
};
request.onerror = () => reject(request.error);
});
});
}
};
}
private async performOperation<R>(
className: string,
mode: IDBTransactionMode,
operation: (store: IDBObjectStore) => Promise<R>
): Promise<R> {
Iif (!this.db) {
throw new Error("Database not initialized.");
}
const storeName = className.toLowerCase();
const transaction = this.db.transaction(storeName, mode);
const store = transaction.objectStore(storeName);
return operation(store);
}
// Legacy methods for backward compatibility
// will be removed in future versions
async create<T>(cls: { new(...args: any[]): T }, item: T): Promise<void> {
const entityName = cls.name.toLowerCase();
const repository = this.entityRepositories.get(entityName);
return repository?.create(item);
}
async read<T>(cls: { new(...args: any[]): T }, key: string): Promise<T | undefined> {
const entityName = cls.name.toLowerCase();
const repository = this.entityRepositories.get(entityName);
return repository?.read(key);
}
async update<T>(cls: { new(...args: any[]): T }, item: T): Promise<void> {
const entityName = cls.name.toLowerCase();
const repository = this.entityRepositories.get(entityName);
return repository?.update(item);
}
async delete<T>(cls: { new(...args: any[]): T }, key: string): Promise<void> {
const entityName = cls.name.toLowerCase();
const repository = this.entityRepositories.get(entityName);
return repository?.delete(key);
}
async list<T>(cls: { new(...args: any[]): T }): Promise<T[]> {
const entityName = cls.name.toLowerCase();
const repository = this.entityRepositories.get(entityName);
return repository?.list() || [];
}
// legacy method implementation ends here
getAvailableEntities(): string[] {
return Array.from(this.entityRepositories.keys());
}
}
export { Database, KeyPath, DataClass, Index, EntityRepository };
export type { DatabaseWithRepositories }; |