package org.fax4j.common;
   
   import java.util.Map;
   import org.fax4j.util.LibraryConfigurationLoader;
   import org.fax4j.util.ReflectionHelper;
   
   /**
    * Manages the internal fax4j logger.
    *
   * @author Sagie Gur-Ari
   * @version 1.04
   * @since 0.40.6
   */
  public final class LoggerManager {
      /** The fax4j logger */
      private Logger logger;
      /** The global instance */
      private static final LoggerManagererManager">LoggerManager INSTANCE = new LoggerManager();
      /** The logger class name property key */
      public static final String LOGGER_CLASS_NAME_PROPERTY_KEY = "org.fax4j.logger.class.name";
      /** The logger log level property key */
      public static final String LOGGER_LOG_LEVEL_PROPERTY_KEY = "org.fax4j.logger.log.level";
  
      /**
       * This is the class constructor.
       */
      private LoggerManager() {
          super();
  
          // initialize logger
          this.initializeLogger();
      }
  
      /**
       * This function returns the global instance.
       *
       * @return The global instance
       */
      public static LoggerManager getInstance() {
          return LoggerManager.INSTANCE;
      }
  
      /**
       * This function initializes the fax4j global logger.
       */
      private void initializeLogger() {
          // get system configuration
          Map<String, String> systemConfiguration = LibraryConfigurationLoader.getSystemConfiguration();
  
          // create new logger
          this.createLogger(systemConfiguration);
      }
  
      /**
       * This function returns the fax4j internal logger.
       *
       * @return The fax4j internal logger
       */
      public Logger getLogger() {
          return this.logger;
      }
  
      /**
       * This function creates the logger used by the fax4j framework.<br>
       * The logger must extend org.fax4j.util.Logger and it's class name is defined by the org.fax4j.logger.class.name
       * property in the fax4j configuration.<br>
       * The org.fax4j.logger.log.level property is used to set the intial log level of the logger.
       *
       * @param systemConfiguration
       *            The system configuration
       */
      private void createLogger(Map<String, String> systemConfiguration) {
          // get class name
          String className = systemConfiguration.get(LoggerManager.LOGGER_CLASS_NAME_PROPERTY_KEY);
          if (className == null || className.length() == 0) {
              className = SimpleLogger.class.getName();
          }
  
          // create new instance
          Logger/org/fax4j/common/Logger.html#Logger">Logger loggerInstance = (Logger) ReflectionHelper.createInstance(className);
  
          // set default log level as NONE
          loggerInstance.setLogLevel(LogLevel.NONE);
  
          // get log level
          String logLevelName = systemConfiguration.get(LoggerManager.LOGGER_LOG_LEVEL_PROPERTY_KEY);
  
          // set log level (ignore invalid log level)
          if (logLevelName != null) {
              if (logLevelName.equalsIgnoreCase(LogLevel.ERROR.getName())) {
                  loggerInstance.setLogLevel(LogLevel.ERROR);
              } else if (logLevelName.equalsIgnoreCase(LogLevel.INFO.getName())) {
                  loggerInstance.setLogLevel(LogLevel.INFO);
              } else if (logLevelName.equalsIgnoreCase(LogLevel.DEBUG.getName())) {
                  loggerInstance.setLogLevel(LogLevel.DEBUG);
              }
          }
  
          // get reference
         this.logger = loggerInstance;
     }
 }