Aufgabe11_GrafChat/src/ChatProgramm/util/OhmLogger.java

package ChatProgramm.util;

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import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDateTime;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
//import java.util.Properties;
import java.util.logging.*;

/**
 * Klasse zur eigens konfigurierten Log-Ausgabe in der Console
 * @author ahrens
 */
public class OhmLogger
{
  private static final String LOGGER_NAME = "OhmLogger";
  private static Logger lg = null;
  
  /**
   * privater Konstrukter -> Singleton
   */
  private OhmLogger() 
  {
  }
  
  /**
   * Public Method zum Erstellen des Loggers und zum Aufruf der Methode 
   * zum Initialisieren
   * @return Referenz auf Logger
   */
  public static Logger getLogger()
  {
    if (lg == null)
    {
      lg = Logger.getLogger(LOGGER_NAME);
      initLogger();
    }
    return lg;
  }
  
  /**
   * Methode zum Initialisieren, Suchen der Konfigurationsdatei, Anlegen eines
   * neuen Console Handlers, Löschen der bisherigen Standard Handler und 
   * Einfügen des eigenen Handler, Setzen des Levels, je nach Properties
   */
  private static void initLogger()
  {
    try (InputStream configFile = OhmLogger.class.getClassLoader().getResourceAsStream("config.properties")) {
      if (configFile != null) {
        Properties properties = new Properties();
        properties.load(configFile);
        java.util.logging.Level classLogLevel = java.util.logging.Level.parse(properties.getProperty("log.level"));
          
        
        ConsoleHandler ch = new ConsoleHandler();
        ch.setFormatter(new OhmFormatter());
        lg.setUseParentHandlers(false);
        lg.getHandlers();
        lg.addHandler(ch);


        lg.setLevel(classLogLevel);
        
        String logDirectory = properties.getProperty("log.directory");
        String logFileName = properties.getProperty("log.filename");

        FileHandler fileHandler = new FileHandler(logDirectory + "/" + logFileName, true);
        fileHandler.setFormatter(new OhmFormatter());
        lg.addHandler(fileHandler);
                      
            
      } else {
        System.err.println("Unable to find config.properties file. OhmLogger will use default settings.");
      }
    } catch (IOException | SecurityException e) {
      System.err.println("Error configuring OhmLogger: " + e.getMessage());
    }
    
  }
}

/**
 * Klasse zum Setzen des Formates des Auszugebenden Log-Strings
 * @author ahren
 */
class OhmFormatter extends Formatter
{
  @Override
  public String format(LogRecord record)
  {
    String logline = "| ";
    
    LocalDateTime ldt = LocalDateTime.now();
    logline += ldt.toString();
    logline += " | " + record.getLevel();
    logline += " | " + record.getSourceClassName();
    logline += " | " + record.getMessage();
    logline += " |\n";
    
    return logline;
  }
}