code: public static boolean isLoggable(String tag, int level) {
          if (! activated && level != Constants.ASSERT) {
              return false;
          }
          Integer logLevel = getLogLevel(tag);
          if (logLevel == null) {
              logLevel = defaultLogLevel;
          }
          return level >= logLevel;
      }
docs: Checks to see whether or not a log for the specified tag is loggable at
  the specified level.
  
  The default level of any tag is set as specified in
  {@link #setDefaultLogLevel(int)}. This means that any level above and
  including that level will be logged.
  
  Use {@link #configure(Properties)} to define different log levels for
  each tag.
  
  @param tag
  The tag to check.
  @param level
  The level to check.
  @return Whether or not that this is allowed to be logged.