CarDatabase

java.lang.Object

crms.lib.Database<Car>

crms.lib.CarDatabase

public class CarDatabase extends Database<Car>

The CarDatabase class manages the collection of recorded Car objects in the local database and performs various operations related to them.

It implements the singleton pattern to ensure only one instance of the class exists.

It provides methods to add, remove, and retrieve Car objects, generate reports, and handle data persistence to a local file.

Field Summary

Fields inherited from class crms.lib.Database
dataList
Method Summary

Modifier and Type

Method

Description

void

fetchFromDisk()

Fetches the recorded Car objects from the file cars.txt.

static CarDatabase

getInstance()

Returns the singleton instance of CarDatabase.

Car

getItemById(String id)

Retrieves a Car object using the given ID.

void

saveToDisk()

Saves the list of Car objects to the file cars.txt.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details
- getInstance
  
  public static CarDatabase getInstance()
  
  Returns the singleton instance of CarDatabase. If the instance does not exist, it is created and the cars are fetched from disk.
  
  Returns:
  
  the singleton instance of CarDatabase.
- getItemById
  
  public Car getItemById(String id)
  
  Retrieves a Car object using the given ID.
  
  Specified by:
  
  getItemById in class Database<Car>
  
  Parameters:
  
  id - the ID of the car to be retrieved.
  
  Returns:
  
  the Car object with the specified ID, or null if not found.
- fetchFromDisk
  
  public void fetchFromDisk()
  
  Fetches the recorded Car objects from the file cars.txt.
  
  Specified by:
  
  fetchFromDisk in class Database<Car>
- saveToDisk
  
  public void saveToDisk()
  
  Saves the list of Car objects to the file cars.txt.
  
  Specified by:
  
  saveToDisk in class Database<Car>