/*

  *   StarOffice News Server

  *   see AUTHORS for the list of contributors

  *

  *   This program 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.

  *

  *   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

  */

 package com.so.news;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.util.Properties;

 /**

  * Manages the n3tpd configuration.

  * @author Christian Lins

  */

 public class Config

 {

   /** The filename of the logfile */

   public static final String CONFIG_N3TPD_LOGFILE = "n3tpd.logfile";

   /** The filename of the config file that is loaded on startup */

   public static final String FILE                 = "n3tpd.conf";

   private static final Properties defaultConfig = new Properties();

   private static Config instance = null;

   static

   {

     // Set some default values

     defaultConfig.setProperty("n3tpd.article.lifetime", "300"); // 300 days

     defaultConfig.setProperty("n3tpd.article.maxsize", "100");  // 100 kbyte

     defaultConfig.setProperty("n3tpd.port", "119");

     defaultConfig.setProperty("n3tpd.auxport", "8080");

     defaultConfig.setProperty("n3tpd.server.backlog", "10");

     defaultConfig.setProperty("n3tpd.hostname", "localhost");

     defaultConfig.setProperty("n3tpd.storage.database", "jdbc:mysql://localhost/n3tpd_data");

     defaultConfig.setProperty("n3tpd.storage.dbmsdriver", "com.mysql.jdbc.Driver");

     defaultConfig.setProperty("n3tpd.storage.user", "n3tpd_user");

     defaultConfig.setProperty("n3tpd.storage.password", "mysecret");

     instance = new Config();

   }

   /**

    * @return A Config instance

    */

   public static Config getInstance()

   {

     return instance;

   }

   // Every config instance is initialized with the default values.

   private Properties settings = (Properties)defaultConfig.clone();

   /**

    * Config is a singelton class with only one instance at time.

    * So the constructor is private to prevent the creation of more

    * then one Config instance.

    * @see Config.getInstance() to retrieve an instance of Config

    */

   private Config()

   {

     try

     {

       // Load settings from file

       load();

     }

     catch(IOException e)

     {

       e.printStackTrace();

     }

   }

   /**

    * Loads the configuration from the config file. By default this is done

    * by the (private) constructor but it can be useful to reload the config

    * by invoking this method.

    * @throws IOException

    */

   public void load() throws IOException

   {

     try

     {

       settings.load(new FileInputStream(FILE));

     }

     catch (FileNotFoundException e)

     {

       save();

     }

   }

   /**

    * Saves this Config to the config file. By default this is done

    * at program end.

    * @throws FileNotFoundException

    * @throws IOException

    */

   public void save() throws FileNotFoundException, IOException

   {

     settings.store(new FileOutputStream(FILE), "N3TPD Config File");

   }

   /**

    * Returns the value that is stored within this config

    * identified by the given key. If the key cannot be found

    * the default value is returned.

    * @param key Key to identify the value.

    * @param def The default value that is returned if the key

    * is not found in this Config.

    * @return

    */

   public String get(String key, String def)

   {

     return settings.getProperty(key, def);

   }

   /**

    * Returns the value that is stored within this config

    * identified by the given key. If the key cannot be found

    * the default value is returned.

    * @param key Key to identify the value.

    * @param def The default value that is returned if the key

    * is not found in this Config.

    * @return

    */

   public int get(String key, int def)

   {

     try

     {

       String val = get(key);

       return Integer.parseInt(val);

     }

     catch(Exception e)

     {

       return def;

     }

   }

   /**

    * Returns the value that is stored within this config

    * identified by the given key. If the key cannot be found

    * the default value is returned.

    * @param key Key to identify the value.

    * @param def The default value that is returned if the key

    * is not found in this Config.

    * @return

    */

   public long get(String key, long def)

   {

     try

     {

       String val = get(key);

       return Long.parseLong(val);

     }

     catch(Exception e)

     {

       return def;

     }

   }

   /**

    * Returns the value for the given key or null if the

    * key is not found in this Config.

    * @param key

    * @return

    */

   private String get(String key)

   {

     return settings.getProperty(key);

   }

   /**

    * Sets the value for a given key.

    * @param key

    * @param value

    */

   public void set(String key, String value)

   {

     settings.setProperty(key, value);

   }

 }