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The framework library contains utility classes that are generic and useful for building applications that introspect a database via JDBC. These are not intended to be SQuirreLSQL-specific and could be used by other projects JDBC front-end applications. This project is guaranteed to have no code dependencies on other SQuirreLSQL projects and could therefore be used when building a different JDBC front-end application.

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package net.sourceforge.squirrel_sql.fw.sql;
/*
 * Copyright (C) 2001-2004 Colin Bell
 * [email protected]
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
import java.io.File;
import java.lang.reflect.Modifier;
import java.net.MalformedURLException;
import java.net.URL;
import java.sql.Driver;
import java.util.ArrayList;
import java.util.List;

import net.sourceforge.squirrel_sql.fw.util.MyURLClassLoader;
import net.sourceforge.squirrel_sql.fw.util.log.ILogger;
import net.sourceforge.squirrel_sql.fw.util.log.LoggerController;

public class SQLDriverClassLoader extends MyURLClassLoader
{
    
    /** Logger for this class. */
    private final static ILogger s_log =
                LoggerController.createLogger(SQLDriverClassLoader.class);    
    
	public SQLDriverClassLoader(ISQLDriver sqlDriver) throws MalformedURLException
	{
		super(createURLs(sqlDriver.getName(), sqlDriver.getJarFileNames()));
	}

	public SQLDriverClassLoader(URL[] urls)
	{
		super(urls);
	}

	public SQLDriverClassLoader(URL url)
	{
		super(url);
	}

	public Class[] getDriverClasses(ILogger logger)
	{
		final Class[] classes = getAssignableClasses(Driver.class, logger);
		final List> list = new ArrayList>();
		for (int i = 0; i < classes.length; ++i)
		{
			Class clazz = classes[i];
			if (!Modifier.isAbstract(clazz.getModifiers()))
			{
				list.add(clazz);
			}
		}
		return list.toArray(new Class[list.size()]);
	}

	private static URL[] createURLs(String driverName, String[] fileNames)
		throws MalformedURLException
	{
		if (fileNames == null)
		{
			fileNames = new String[0];
		}
		URL[] urls = new URL[fileNames.length];
		for (int i = 0; i < fileNames.length; ++i)
		{
            File f = new File(fileNames[i]);
            if (!f.exists()) {
                s_log.info(
                    "For driver '"+driverName+"', the JVM says file doesn't exist: "+
                    fileNames[i]);
            }
            if (f.isDirectory()) {
                s_log.info(
                    "For driver '"+driverName+"', the JVM says the file is a directory: "+
                    fileNames[i]);
            }
            if (!f.canRead()) {
                s_log.info(
                    "For driver '"+driverName+"', the JVM says the file can't be read: "+
                    fileNames[i]);
            }
            urls[i] = f.toURI().toURL();
            
		}
		return urls;
	}
}