[junk-cvs-sync] junk/WEB-INF/classes/junk/plugin/database DatabasePlugin.java,NONE,1.1

[Marcus <the...@us...>]

Update of /cvsroot/junk/junk/WEB-INF/classes/junk/plugin/database
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv25598

Added Files:
	DatabasePlugin.java 
Log Message:
initial import



--- NEW FILE: DatabasePlugin.java ---
/*
 * juNK - a file search system for smb shares
 *
 * Copyright 2004 by
 *	Marcus Proest (theevilflow at users dot sf dot net)
 * 	Uwe van Heesch (tyron_e at users dot sf dot net)
 *
 *  This file is part of junk (java useful net kollektor).
 *
 *   junk 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 2 of the License, or
 *   (at your option) any later version.
 *
 *   junk 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 junk; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/*
 * DatabasePlugin.java
 *
 * Created on 23. März 2004, 20:28
 */
package junk.plugin.database;

import junk.plugin.PluginTools;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import java.util.HashMap;

import javax.servlet.ServletException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;


/**
 * plugin to provide a database connection instead of using DBCP
 * @author Marcus Proest
 */
public class DatabasePlugin implements PlugIn, ConnectionProvider {
    /**
     * context saving key
     */
    public static final String KEY_DATABASE_CON = "database-provider";

    /** the actionservlet of the struts application */
    private ActionServlet actionServlet = null;

    /**
     * plugin configuration
     */
    private HashMap conf = null;

    /** log writer */
    private Log log = LogFactory.getLog(DatabasePlugin.class);

    /**
     * database password
     */
    private String pass = null;

    /**
     * database url
     */
    private String url = null;

    /**
     * database user
     */
    private String user = null;

    /** Creates a new instance of DatabasePlugin */
    public DatabasePlugin() {
    }

    /**
     * return a valid database connection
     * @throws SQLException yupp, life's bad
     * @return a valid database connection
     */
    public Connection getConnection() throws SQLException {
        return DriverManager.getConnection(url, user, pass);
    }

    /**
     * destroy plugin
     */
    public void destroy() {
        log.info("DatabasePlugin just left the building");
    }

    /**
     * initialize plugin
     * @param a ActionServlet of the struts application
     * @param m the ModuleConfig of the struts application
     * @throws ServletException ServletException
     */
    public void init(ActionServlet a, ModuleConfig m)
        throws ServletException {
        this.actionServlet = a;
        this.conf = PluginTools.getPluginConfig(DatabasePlugin.class, m);

        if (this.conf == null) {
            log.fatal("No database configuration found.");
        }

        String driver = (String) this.conf.get("driverClass");
        this.url = (String) this.conf.get("url");
        this.user = (String) this.conf.get("user");
        this.pass = (String) this.conf.get("password");

        if ((driver == null) || (url == null) || (user == null)
                || (pass == null)) {
            log.fatal("Bad database configuration:" + "[" + driver + "][" + url
                + "][" + user + "][(pass null?)" + (pass == null) + "]",
                new IllegalArgumentException());
        }

        try {
            Class.forName(driver).newInstance();

            Connection con = DriverManager.getConnection(url, user, pass);
            con.close();
        } catch (SQLException e1) {
            log.fatal("Error while connecting to data source.", e1);
        } catch (ClassNotFoundException e2) {
            log.fatal("Could not find JDBC driver.", e2);
        } catch (InstantiationException e3) {
            log.fatal("Could not instantiate JDBC driver.", e3);
        } catch (IllegalAccessException e4) {
            log.fatal("Illegal access while instatiating JDBC driver.", e4);
        }

        this.actionServlet.getServletContext().setAttribute(DatabasePlugin.KEY_DATABASE_CON,
            (ConnectionProvider) this);
        log.info("DatabasePlugin loaded ( [" + driver + "][" + url + "]["
            + user + "] )");
    }
}