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/*
 * This file is part of Log4Jdbc.
 *
 * Log4Jdbc is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Log4Jdbc is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Log4Jdbc.  If not, see .
 *
 */
package fr.ms.sql;

import java.io.PrintWriter;
import java.sql.Driver;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.Vector;

/**
 *
 * @see Marco4J
 *
 *
 * @author Marco Semiao
 *
 */
public class JdbcDriverManagerExtended implements JdbcDriverManager {

    private final static JdbcDriverManager driverManager = new JdbcDriverManagerImpl();

    private final Vector jdbcDrivers = new Vector();

    public void setLogWriter(final PrintWriter out) {
	driverManager.setLogWriter(out);
    }

    public Enumeration getDrivers() {
	final Vector result = new Vector();

	java.sql.Driver d;
	for (int i = 0; i < jdbcDrivers.size(); i++) {
	    final DriverInfo di = (DriverInfo) jdbcDrivers.elementAt(i);
	    result.addElement(di.driver);
	}

	final Enumeration driverManagerDrivers = driverManager.getDrivers();
	while (driverManagerDrivers.hasMoreElements()) {
	    d = (java.sql.Driver) driverManagerDrivers.nextElement();

	    result.addElement(d);
	}

	return result.elements();
    }

    public synchronized void registerDriver(final Driver driver) throws SQLException {

	if (!Driver.class.equals(driver.getClass())) {
	    final DriverInfo driverInfo = new DriverInfo(driver);
	    if (!jdbcDrivers.contains(driverInfo)) {
		jdbcDrivers.addElement(driverInfo);
	    }
	}
	driverManager.registerDriver(driver);
    }

    private final static class DriverInfo {
	private final Driver driver;
	private final Class driverClass;

	public DriverInfo(final Driver driver) {
	    this.driver = driver;
	    this.driverClass = driver.getClass();
	}

	public boolean equals(final Object other) {
	    return (other instanceof DriverInfo) && this.driverClass == ((DriverInfo) other).driverClass;
	}

	public String toString() {
	    return "driver[className=" + driverClass + "]";
	}
    }
}