at.chrl.database.dao

Class DAOManager

java.lang.Object

at.chrl.database.dao.DAOManager

public class DAOManager
extends Object

This class manages DAO implementations, it resolves valid implementation for current database

Author:

SoulKeeper, Saelya

Method Summary

Modifier and Type	Method and Description
static <T extends DAO> T	getDAO(Class<T> clazz) Returns DAO implementation by DAO class.
static void	init() Initializes DAOManager.
static void	registerDAO(Class<? extends DAO> daoClass) Registers DAO.
static void	shutdown() Shutdown DAOManager
static void	unregisterDAO(Class<? extends DAO> daoClass) Unregisters DAO class

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

init

public static void init()

Initializes DAOManager.

shutdown

public static void shutdown()

Shutdown DAOManager

getDAO

public static <T extends DAO> T getDAO(Class<T> clazz)
                                throws DAONotFoundException

Returns DAO implementation by DAO class. Typical usage:

 
 AccountDAO dao = DAOManager.getDAO(AccountDAO.class);
 

Type Parameters:

T - Subclass of DAO

Parameters:

clazz - Abstract DAO class implementation of which was registered

Returns:

DAO implementation

Throws:

DAONotFoundException - if DAO implementation not found

registerDAO

public static void registerDAO(Class<? extends DAO> daoClass)
                        throws DAOAlreadyRegisteredException,
                               IllegalAccessException,
                               InstantiationException

Registers DAO.
First it creates new instance of DAO, then invokes DAO.supports(String, int, int)
. If the result was possitive - it associates DAO instance with DAO.getClassName()
If another DAO was registed - DAOAlreadyRegisteredException will be thrown

Parameters:

daoClass - DAO implementation

Throws:

DAOAlreadyRegisteredException - if DAO is already registered

IllegalAccessException - if something went wrong during instantiation of DAO

InstantiationException - if something went wrong during instantiation of DAO

unregisterDAO

public static void unregisterDAO(Class<? extends DAO> daoClass)

Unregisters DAO class

Parameters:

daoClass - DAO implementation to unregister