streamlined logging

- log via logger, if stdout, just wrap in Handler
- logger instance property since handlers are being removed/ added
- java bundled logger uses MessageFormat, so add indexes in curly braces

FabianUtil.java

@@ -11,8 +11,10 @@ import java.time.Duration;
 import java.time.ZonedDateTime;
 import java.time.temporal.ChronoUnit;
 import java.util.concurrent.TimeUnit;
-import java.util.function.Supplier;
+import java.util.logging.Handler;
 import java.util.logging.Level;
+import java.util.logging.SimpleFormatter;
+import java.util.logging.StreamHandler;
 
 @SuppressWarnings("unused")
 public class FabianUtil {
@@ -116,17 +118,16 @@ public class FabianUtil {
 
    public static class ProgressHandler {
 
-      private static final Logger LOG = new Logger(ProgressHandler.class);
       private static final DecimalFormat TIME_DECIMAL_FORMAT = new DecimalFormat("00");
       protected static final int DEFAULT_LOG_DISTANCE = 50;
       protected static final int DEFAULT_TIME_LOG_DISTANCE = 15;
 
+      protected final Logger log;
       private final ZonedDateTime startTime;
       private final BigDecimal logDistance;
       private final int timeLogDistance;
       private BigDecimal counter = BigDecimal.ZERO;
       private ZonedDateTime lastLoggedAt;
-      protected final PrintStream printer;
 
 
       public ProgressHandler() {
@@ -144,11 +145,17 @@ public class FabianUtil {
       }
 
 
-      public ProgressHandler(int logDistance, int timeLogDistance, PrintStream printer) {
+      public ProgressHandler(int logDistance, int timeLogDistance, OutputStream printer) {
          startTime = ZonedDateTime.now();
          this.logDistance = validateBD(logDistance, "Log-Distanz");
          this.timeLogDistance = validateInt(timeLogDistance, "Zeitbasierte Log-Distanz");
-         this.printer = printer;
+         log = new Logger(getClass());
+         if (printer != null) {
+            for (Handler handler : log.getHandlers()) {
+               log.removeHandler(handler);
+            }
+            log.addHandler(new StreamHandler(printer, new SimpleFormatter()));
+         }
       }
 
 
@@ -165,11 +172,6 @@ public class FabianUtil {
       }
 
 
-      protected Logger logger() {
-         return LOG;
-      }
-
-
       protected final synchronized BigDecimal counter() {
          return counter;
       }
@@ -205,7 +207,7 @@ public class FabianUtil {
 
 
       protected synchronized boolean shouldLog() {
-         return (printer != null || logger().isLoggable(Level.INFO)) && (counter.remainder(logDistance).signum() == 0 || isBored());
+         return log.isLoggable(Level.INFO) && (counter.remainder(logDistance).signum() == 0 || isBored());
       }
 
 
@@ -222,11 +224,7 @@ public class FabianUtil {
 
       public synchronized void log() {
          Duration timePassed = getTimePassed();
-         if (printer != null) {
+         log.info("{0} Stück erledigt. {1} vergangen.", counter, formatDuration(timePassed));
-            printer.println(counter + " Stück erledigt. " + formatDuration(timePassed) + " vergangen.");
-         } else {
-            logger().info("{} Stück erledigt. {} vergangen.", counter, formatDuration(timePassed));
-         }
          updateLastLoggedAt();
       }
 
@@ -253,18 +251,13 @@ public class FabianUtil {
 
       public synchronized void logFinal() {
          Duration timePassed = getTimePassed();
-         if (printer != null) {
+         log.info("{0} Stück (100 %) erledigt. {1} vergangen.", counter, formatDuration(timePassed));
-            printer.println(counter + " Stück (100 %) erledigt. " + formatDuration(timePassed) + " vergangen.");
-         } else {
-            logger().info("{} Stück (100 %) erledigt. {} vergangen.", counter, formatDuration(timePassed));
-         }
       }
    }
 
 
    public static class ProgressHandlerWithTotal extends ProgressHandler {
 
-      private static final Logger LOG = new Logger(ProgressHandlerWithTotal.class);
       private static final DecimalFormat PERCENTAGE_FORMAT = new DecimalFormat("00.00");
       private static final BigDecimal ONE_HUNDRED_PERCENT = BigDecimal.valueOf(100);
 
@@ -286,18 +279,12 @@ public class FabianUtil {
       }
 
 
-      public ProgressHandlerWithTotal(int logDistance, int timeLogDistance, int total, PrintStream printer) {
+      public ProgressHandlerWithTotal(int logDistance, int timeLogDistance, int total, OutputStream printer) {
          super(logDistance, timeLogDistance, printer);
          this.total = validateBD(total, "Gesamt-Anzahl");
       }
 
 
-      @Override
-      protected Logger logger() {
-         return LOG;
-      }
-
-
       @Override
       protected synchronized boolean shouldLog() {
          return super.shouldLog() && counter().compareTo(total) <= 0;
@@ -320,13 +307,8 @@ public class FabianUtil {
          }
 
          String counterPrint = total.compareTo(BigDecimal.TEN) >= 0 ? formatNumber(counter) : counter.toString();
-         if (printer != null) {
+         log.info("{0} Stück von {1} ({2} %) erledigt. {3} vergangen{4}.",
-            printer.println(counterPrint + " Stück von " + total + " (" + PERCENTAGE_FORMAT.format(percentage) + " %) erledigt. "
-                + formatDuration(timePassed) + " vergangen" + remainingTimePart + ".");
-         } else {
-            logger().info("{} Stück von {} ({} %) erledigt. {} vergangen{}.",
              counterPrint, total, PERCENTAGE_FORMAT.format(percentage), formatDuration(timePassed), remainingTimePart);
-         }
          updateLastLoggedAt();
       }