chris@3: /*
chris@3:  *   SONEWS News Server
chris@3:  *   see AUTHORS for the list of contributors
chris@3:  *
chris@3:  *   This program is free software: you can redistribute it and/or modify
chris@3:  *   it under the terms of the GNU General Public License as published by
chris@3:  *   the Free Software Foundation, either version 3 of the License, or
chris@3:  *   (at your option) any later version.
chris@3:  *
chris@3:  *   This program is distributed in the hope that it will be useful,
chris@3:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@3:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@3:  *   GNU General Public License for more details.
chris@3:  *
chris@3:  *   You should have received a copy of the GNU General Public License
chris@3:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@3:  */
chris@3: 
chris@3: package org.sonews.config;
chris@3: 
chris@3: import java.io.FileInputStream;
chris@3: import java.io.FileNotFoundException;
chris@3: import java.io.FileOutputStream;
chris@3: import java.io.IOException;
chris@3: import java.util.Properties;
chris@3: 
chris@3: /**
chris@3:  * Manages the bootstrap configuration. It MUST contain all config values
chris@3:  * that are needed to establish a database connection.
chris@3:  * For further configuration values use the Config class instead as that class
chris@3:  * stores its values within the database.
chris@3:  * @author Christian Lins
chris@3:  * @since sonews/0.5.0
chris@3:  */
chris@3: class FileConfig extends AbstractConfig
chris@3: {
chris@3: 
chris@3:   private static final Properties defaultConfig = new Properties();
chris@3:   
chris@3:   private static FileConfig instance = null;
chris@3:   
chris@3:   static
chris@3:   {
chris@3:     // Set some default values
chris@3:     defaultConfig.setProperty(Config.STORAGE_DATABASE, "jdbc:mysql://localhost/sonews");
chris@3:     defaultConfig.setProperty(Config.STORAGE_DBMSDRIVER, "com.mysql.jdbc.Driver");
chris@3:     defaultConfig.setProperty(Config.STORAGE_USER, "sonews_user");
chris@3:     defaultConfig.setProperty(Config.STORAGE_PASSWORD, "mysecret");
chris@3:     defaultConfig.setProperty(Config.DEBUG, "false");
chris@3:   }
chris@3:   
chris@3:   /**
chris@3:    * Note: this method is not thread-safe
chris@3:    * @return A Config instance
chris@3:    */
chris@3:   public static synchronized FileConfig getInstance()
chris@3:   {
chris@3:     if(instance == null)
chris@3:     {
chris@3:       instance = new FileConfig();
chris@3:     }
chris@3:     return instance;
chris@3:   }
chris@3: 
chris@3:   // Every config instance is initialized with the default values.
chris@3:   private final Properties settings = (Properties)defaultConfig.clone();
chris@3: 
chris@3:   /**
chris@3:    * Config is a singelton class with only one instance at time.
chris@3:    * So the constructor is private to prevent the creation of more
chris@3:    * then one Config instance.
chris@3:    * @see Config.getInstance() to retrieve an instance of Config
chris@3:    */
chris@3:   private FileConfig()
chris@3:   {
chris@3:     try
chris@3:     {
chris@3:       // Load settings from file
chris@3:       load();
chris@3:     }
chris@3:     catch(IOException ex)
chris@3:     {
chris@3:       ex.printStackTrace();
chris@3:     }
chris@3:   }
chris@3: 
chris@3:   /**
chris@3:    * Loads the configuration from the config file. By default this is done
chris@3:    * by the (private) constructor but it can be useful to reload the config
chris@3:    * by invoking this method.
chris@3:    * @throws IOException
chris@3:    */
chris@3:   public void load() 
chris@3:     throws IOException
chris@3:   {
chris@3:     FileInputStream in = null;
chris@3:     
chris@3:     try
chris@3:     {
chris@3:       in = new FileInputStream(
chris@3:         Config.inst().get(Config.LEVEL_CLI, Config.CONFIGFILE, "sonews.conf"));
chris@3:       settings.load(in);
chris@3:     }
chris@3:     catch (FileNotFoundException e)
chris@3:     {
chris@3:       // MUST NOT use Log otherwise endless loop
chris@3:       System.err.println(e.getMessage());
chris@3:       save();
chris@3:     }
chris@3:     finally
chris@3:     {
chris@3:       if(in != null)
chris@3:         in.close();
chris@3:     }
chris@3:   }
chris@3: 
chris@3:   /**
chris@3:    * Saves this Config to the config file. By default this is done
chris@3:    * at program end.
chris@3:    * @throws FileNotFoundException
chris@3:    * @throws IOException
chris@3:    */
chris@3:   public void save() throws FileNotFoundException, IOException
chris@3:   {
chris@3:     FileOutputStream out = null;
chris@3:     try
chris@3:     {
chris@3:       out = new FileOutputStream(
chris@3:         Config.inst().get(Config.LEVEL_CLI, Config.CONFIGFILE, "sonews.conf"));
chris@3:       settings.store(out, "SONEWS Config File");
chris@3:       out.flush();
chris@3:     }
chris@3:     catch(IOException ex)
chris@3:     {
chris@3:       throw ex;
chris@3:     }
chris@3:     finally
chris@3:     {
chris@3:       if(out != null)
chris@3:         out.close();
chris@3:     }
chris@3:   }
chris@3:   
chris@3:   /**
chris@3:    * Returns the value that is stored within this config
chris@3:    * identified by the given key. If the key cannot be found
chris@3:    * the default value is returned.
chris@3:    * @param key Key to identify the value.
chris@3:    * @param def The default value that is returned if the key
chris@3:    * is not found in this Config.
chris@3:    * @return
chris@3:    */
chris@3:   @Override
chris@3:   public String get(String key, String def)
chris@3:   {
chris@3:     return settings.getProperty(key, def);
chris@3:   }
chris@3: 
chris@3:   /**
chris@3:    * Sets the value for a given key.
chris@3:    * @param key
chris@3:    * @param value
chris@3:    */
cli@30:   @Override
chris@3:   public void set(final String key, final String value)
chris@3:   {
chris@3:     settings.setProperty(key, value);
chris@3:   }
chris@3: 
chris@3: }