new project structure

- use objects and inheritance
- enabled combined version for drinking and loading bar without impacting any of them

zeitlaeufer/src/main/java/de/szimnau/AbstractProgressBar.java

@@ -0,0 +1,50 @@
+package de.szimnau;
+
+import de.szimnau.tools.FormatTools;
+import java.math.BigDecimal;
+import java.math.MathContext;
+import java.time.LocalTime;
+
+
+public abstract class AbstractProgressBar extends AbstractLoadingBar {
+
+   protected static final int LINE_LENGTH = 100;
+   protected static final BigDecimal ONE_HUNDRED_PERCENT = BigDecimal.valueOf(100);
+
+
+   protected AbstractProgressBar(LocalTime startTime) {
+      super(startTime);
+   }
+
+
+   protected AbstractProgressBar(LocalTime startTime, LocalTime endTime) {
+      super(startTime, endTime);
+   }
+
+
+   @Override
+   protected String fillLoadingBar(long passedMinutes, boolean progressive) {
+      var nonNegativePassedMinutes = BigDecimal.valueOf(passedMinutes < 0 ? 0 : passedMinutes);
+      BigDecimal wholePercentage = ONE_HUNDRED_PERCENT
+         // kind of reverse dreisatz to avoid having e.g. 99.9999 instead of 100 %
+         .multiply(nonNegativePassedMinutes)
+         .divide(getTotalMinutesBD(), MathContext.DECIMAL64);
+      int numberOfEquals = wholePercentage.intValue();
+      var sb = new StringBuilder("[");
+      for (int i = 0; i < LINE_LENGTH; i++) {
+         if (i < numberOfEquals) {
+            sb.append("=");
+         } else {
+            sb.append("-");
+         }
+      }
+      BigDecimal remainingMinutes = getTotalMinutesBD().subtract(nonNegativePassedMinutes);
+      sb.append("] ").append(FormatTools.PERCENTAGE_FORMAT.format(wholePercentage)).append("% ")
+          .append(FormatTools.minutesToTimeString(nonNegativePassedMinutes)).append(" - ")
+          .append(FormatTools.minutesToTimeString(remainingMinutes));
+      if (progressive) {
+         sb.append("\r");
+      }
+      return sb.toString();
+   }
+}