/*

  *   SONEWS 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 org.sonews.daemon;

 import org.sonews.util.Log;

 import java.sql.SQLException;

 import org.sonews.daemon.storage.Database;

 import org.sonews.util.AbstractConfig;

 import org.sonews.util.TimeoutMap;

 /**

  * Provides access to the program wide configuration that is stored within

  * the server's database.

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public final class Config extends AbstractConfig

 {

   /** Config key constant. Value is the maximum article size in kilobytes. */

   public static final String ARTICLE_MAXSIZE   = "sonews.article.maxsize";

   /** Config key constant. Value: Amount of news that are feeded per run. */

   public static final String FEED_NEWSPERRUN   = "sonews.feed.newsperrun";

   public static final String FEED_PULLINTERVAL = "sonews.feed.pullinterval";

   public static final String HOSTNAME          = "sonews.hostname";

   public static final String PORT              = "sonews.port";

   public static final String TIMEOUT           = "sonews.timeout";

   public static final String MLPOLL_DELETEUNKNOWN = "sonews.mlpoll.deleteunknown";

   public static final String MLPOLL_HOST       = "sonews.mlpoll.host";

   public static final String MLPOLL_PASSWORD   = "sonews.mlpoll.password";

   public static final String MLPOLL_USER       = "sonews.mlpoll.user";

   public static final String MLSEND_ADDRESS    = "sonews.mlsend.address";

   public static final String MLSEND_RW_FROM    = "sonews.mlsend.rewrite.from";

   public static final String MLSEND_RW_SENDER  = "sonews.mlsend.rewrite.sender";

   public static final String MLSEND_HOST       = "sonews.mlsend.host";

   public static final String MLSEND_PASSWORD   = "sonews.mlsend.password";

   public static final String MLSEND_PORT       = "sonews.mlsend.port";

   public static final String MLSEND_USER       = "sonews.mlsend.user";

   public static final String[] AVAILABLE_KEYS = {

     Config.ARTICLE_MAXSIZE,

     Config.FEED_NEWSPERRUN,

     Config.FEED_PULLINTERVAL,

     Config.HOSTNAME,

     Config.MLPOLL_DELETEUNKNOWN,

     Config.MLPOLL_HOST,

     Config.MLPOLL_PASSWORD,

     Config.MLPOLL_USER,

     Config.MLSEND_ADDRESS,

     Config.MLSEND_HOST,

     Config.MLSEND_PASSWORD,

     Config.MLSEND_PORT,

     Config.MLSEND_RW_FROM,

     Config.MLSEND_RW_SENDER,

     Config.MLSEND_USER,

     Config.PORT,

     Config.TIMEOUT

   };

   private static Config instance = new Config();

   public static Config getInstance()

   {

     return instance;

   }

   private final TimeoutMap<String, String> values 

     = new TimeoutMap<String, String>();

   private Config()

   {

     super();

   }

   /**

    * Returns the config value for the given key or the defaultValue if the

    * key is not found in config.

    * @param key

    * @param defaultValue

    * @return

    */

   public String get(String key, String defaultValue)

   {

     try

     {

       String configValue = values.get(key);

       if(configValue == null)

       {

         configValue = Database.getInstance().getConfigValue(key);

         if(configValue == null)

         {

           return defaultValue;

         }

         else

         {

           values.put(key, configValue);

           return configValue;

         }

       }

       else

       {

         return configValue;

       }

     }

     catch(SQLException ex)

     {

       Log.msg(ex.getMessage(), false);

       return defaultValue;

     }

   }

   /**

    * Sets the config value which is identified by the given key.

    * @param key

    * @param value

    */

   public void set(String key, String value)

   {

     values.put(key, value);

     try

     {

       // Write values to database

       Database.getInstance().setConfigValue(key, value);

     }

     catch(SQLException ex)

     {

       ex.printStackTrace();

     }

   }

 }