package net.sourceforge.phpdt.sql.adapters;

import java.util.ArrayList;

public class AdapterFactory {
	public static final String GENERIC = "GENERIC";
    public static final String ORACLE = "ORACLE";
    public static final String POSTGRES = "POSTGRES";
    public static final String MYSQL = "MYSQL";
    public static final String DB2 = "DB2";
    public static final String DB2AS400 = "DB2AS400";
	public static final String ADABASD = "ADABASD";

    private static AdapterFactory instance;
    
    private ArrayList drivers;
    
    private AdapterFactory() {
    	loadDrivers();
    }
    public static synchronized AdapterFactory getInstance() {
    	if (instance == null) {
    		instance = new AdapterFactory();
    	}
    	return instance;
    }

    /**
     * Master list of supported drivers
     */
    private void loadDrivers() {
    	drivers = new ArrayList();

		DriverInfo generic = new DriverInfo(GENERIC, Messages.getString("adapters.generic"), new GenericAdapter());
		DriverInfo oracle = new DriverInfo(ORACLE, Messages.getString("adapters.oracle"), new OracleAdapter());
		DriverInfo db2 = new DriverInfo(DB2,  Messages.getString("adapters.db2"), new DB2Adapter());
		DriverInfo db2as400 = new DriverInfo(DB2AS400,  Messages.getString("adapters.db2as400"), new DB2AS400Adapter());
		DriverInfo postgres = new DriverInfo(POSTGRES,  Messages.getString("adapters.postgres"), new PostgresAdapter());
		DriverInfo mysql = new DriverInfo(MYSQL,  Messages.getString("adapters.mysql"), new MySQLAdapter());
		DriverInfo adabasd = new DriverInfo(ADABASD, Messages.getString("adapters.adabasd"), new AdabasDAdapter());

    	drivers.add(generic);
    	drivers.add(oracle);
    	drivers.add(db2);
    	drivers.add(db2as400);
    	drivers.add(postgres);
    	drivers.add(mysql);
		drivers.add(adabasd);
    }
    
    public synchronized DatabaseAdapter getAdapter(String type) throws NoSuchAdapterException {
    	if (drivers == null) {
    		loadDrivers();
    	}
    	for (int i = 0; i < drivers.size(); i++) {
    		DriverInfo info = (DriverInfo) drivers.get(i);
    		if (type.equals(info.getDriverType())) {
    			return info.getAdapter().getInstance();
    		}
    	}
         throw new NoSuchAdapterException(type);
    }
    
    public synchronized DriverInfo[] getDriverList() {
    	DriverInfo[] driverList = new DriverInfo[drivers.size()];
    	for (int i = 0; i < drivers.size(); i++) {
    		DriverInfo info = (DriverInfo) drivers.get(i);
    		driverList[i] = info;
    	}
    	return driverList;
    }
}