add some error handling

1 files changed, 43 insertions, 20 deletions

diff --git a/src/Q10/TrainTimeTable.java b/src/Q10/TrainTimeTable.java
index 52992e4..a28952b 100644
--- a/src/Q10/TrainTimeTable.java
+++ b/src/Q10/TrainTimeTable.java
@@ -16,11 +16,12 @@ public class TrainTimeTable {
 
   public void delay(String city, int minutes) {
     Station station = stationIn(city);
-    if (station != null) {
-      station.delayBy(minutes);
-      for (int i = schedule.indexOf(station) + 1; i < schedule.size(); i++) {
-        schedule.get(i).delayBy(minutes);
-      }
+    if (station == null)
+      throw new IllegalArgumentException(String.format("`%s` is not on the schedule", city));
+
+    station.delayBy(minutes);
+    for (int i = schedule.indexOf(station) + 1; i < schedule.size(); i++) {
+      schedule.get(i).delayBy(minutes);
     }
   }
 
@@ -68,23 +69,45 @@ public class TrainTimeTable {
       if (selection == null) {
         System.out.println();
         System.out.println("Enter command (Show, Delay, Quit):");
-        selection = in.nextLine().toLowerCase();
+        selection = in.nextLine();
       }
-
-      if (selection.equals("quit")) return;
-
-      if (selection.equals("show")) {
-        schedule.displaySchedule(System.out);
-      } else {
-        String[] tokens = selection.split(" ");
-
-        if (tokens.length < 3) continue;
-
-        String city = "";
-        for (int i = 1; i < tokens.length - 1; i++) city += tokens[i];
-        schedule.delay(city, Integer.parseInt(tokens[tokens.length - 1]));
+      String[] tokens = selection.split(" ");
+      switch (tokens[0].toLowerCase()) {
+        case "quit":
+          System.exit(0);
+          return;
+        case "show":
+          schedule.displaySchedule(System.out);
+          break;
+        case "delay":
+          if (tokens.length < 3) break;
+
+          String city = "";
+          for (int i = 1; i < tokens.length - 1; i++) city += tokens[i];
+
+          try {
+            String enteredMinutes = tokens[tokens.length - 1];
+
+            if (!enteredMinutes.matches("\\d+")) {
+              System.out.println("Invalid minutes entered");
+              break;
+            }
+
+            int minutes = Integer.parseInt(enteredMinutes);
+            if (minutes > (48 * 60)) {
+              System.out.println("Invalid minutes entered");
+              break;
+            }
+            schedule.delay(city, minutes);
+          } catch (IllegalArgumentException error) {
+            System.out.println(error.getMessage());
+          }
+
+          break;
+        default:
+          System.out.println("Unknown command");
+          break;
       }
-
       selection = null;
     }
   }