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src/main/java/florizz/command/AddFlowerCommand.java

@@ -7,10 +7,11 @@
 import florizz.objects.Flower;
 
 import java.util.ArrayList;
+import java.util.logging.Logger;
 
 public class AddFlowerCommand extends Command{
+    private static Logger logger = Logger.getLogger(AddFlowerCommand.class.getName());
     private String flowerName;
-
     private Integer quantity;
     private String bouquetName;
     private boolean enableUi;
@@ -24,6 +25,7 @@ public AddFlowerCommand(String flowerName, int quantity, String bouquetName, boo
 
     @Override
     public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzException {
+        logger.entering(AddFlowerCommand.class.getName(), "execute");
         boolean doesBouquetExist = false;
         Bouquet bouquetToAddFlower = new Bouquet();
         for (int i = 0; !doesBouquetExist && i < bouquetList.size(); i++) {
@@ -34,8 +36,7 @@ public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzExce
         }
 
         if (!doesBouquetExist) {
-            throw new FlorizzException("ERROR: No such bouquet is found." + System.lineSeparator() +
-                                       "Create a bouquet by using 'new <bouquetName>`");
+            throw new FlorizzException("No such bouquet is found.");
         }
 
         boolean doesFlowerExist = false;
@@ -58,6 +59,8 @@ public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzExce
         if (enableUi) {
             ui.printAddFlowerSuccess(bouquetList, flowerName, quantity, bouquetName);
         }
+
+        logger.exiting(AddFlowerCommand.class.getName(), "execute");
         return true;
     }
 }

src/main/java/florizz/command/ExitCommand.java

@@ -4,12 +4,16 @@
 import florizz.objects.Bouquet;
 
 import java.util.ArrayList;
+import java.util.logging.Logger;
 
 public class ExitCommand extends Command {
+    private Logger logger = Logger.getLogger(ExitCommand.class.getName());
 
     @Override
     public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) {
+        logger.entering(ExitCommand.class.getName(), "execute");
         ui.printExitMessage();
+        logger.exiting(ExitCommand.class.getName(), "execute");
         return false;
     }
 }

src/main/java/florizz/command/RecommendCommand.java

@@ -8,10 +8,13 @@
 import florizz.objects.Flower;
 
 import java.util.ArrayList;
+import java.util.logging.Logger;
 
 public class RecommendCommand extends Command{
+    private Logger logger = Logger.getLogger(RecommendCommand.class.getName());
     @Override
     public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzException {
+        logger.entering(RecommendCommand.class.getName(), "execute");
         // ask for occasion
         Flower.Occasion occasion = askOccasion(ui);
 
@@ -40,6 +43,7 @@ public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzExce
         // ask if they want to save bouquet to array
         askSaveBouquet(ui, bouquetList, recommendedBouquet);
 
+        logger.exiting(RecommendCommand.class.getName(), "execute");
         return true;
     }
 
@@ -48,27 +52,31 @@ public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzExce
      * @param eligibleFlowers list of flowers to choose from
      * @param recommendedBouquet bouquet to add flowers to
      */
-    private static void addRandomFlowers(ArrayList<Flower> eligibleFlowers, Bouquet recommendedBouquet) {
+    private void addRandomFlowers(ArrayList<Flower> eligibleFlowers, Bouquet recommendedBouquet) {
+        logger.entering(RecommendCommand.class.getName(), "addRandomFlowers");
         // [TEMPORARY CODE]
         // generate random combination of flowers from eligible flowers totaling to 5
         for (int i = 0; i < 5; i++) {
             int randomIndex = (int) (Math.random() * eligibleFlowers.size());
             recommendedBouquet.addFlower(eligibleFlowers.get(randomIndex), 1);
         }
+        logger.exiting(RecommendCommand.class.getName(), "addRandomFlowers");
     }
 
     /**
      * Asks user for occasion
      * @return Occasion enum
      */
     private Flower.Occasion askOccasion(Ui ui) throws FlorizzException {
+        logger.entering(RecommendCommand.class.getName(), "askOccasion");
         String occasionInput = Parser.parseOccasion(ui.printAskOccasion());
 
         // check if occasion is in our dictionary
         if (!Flower.isValidOccasion(occasionInput)) {
             throw new FlorizzException("This occasion does not exist. Type 'occasion' to get a list of occasions");
         }
 
+        logger.exiting(RecommendCommand.class.getName(), "askOccasion");
         // convert string to Occasion enum
         return Flower.stringToOccasion(occasionInput);
     }
@@ -79,18 +87,22 @@ private Flower.Occasion askOccasion(Ui ui) throws FlorizzException {
      * @return Colour enum
      */
     private Flower.Colour askColour(Ui ui, ArrayList<Flower> eligibleFlowers) throws FlorizzException {
+        assert !eligibleFlowers.isEmpty() : "Eligible flowers should not be empty";
+        logger.entering(RecommendCommand.class.getName(), "askColour");
         String colourInput = Parser.parseColour(ui.printAskColour(eligibleFlowers));
 
         // check if colour is in our dictionary
         if (!Flower.isValidColour(colourInput)) {
             throw new FlorizzException("This colour does not exist. Type 'colour' to get a list of colours");
         }
 
+        logger.exiting(RecommendCommand.class.getName(), "askColour");
         return Flower.stringToColour(colourInput);
     }
 
     private void askSaveBouquet(Ui ui, ArrayList<Bouquet> bouquetList,
                                 Bouquet recommendedBouquet) throws FlorizzException {
+        logger.entering(RecommendCommand.class.getName(), "askSaveBouquet");
         String saveInput = Parser.parseSaveBouquet(ui.printAskSaveBouquet(recommendedBouquet));
 
         if (saveInput.equals("yes")) {
@@ -103,5 +115,6 @@ private void askSaveBouquet(Ui ui, ArrayList<Bouquet> bouquetList,
             ui.printBouquetAdded(recommendedBouquet);
             assert !bouquetList.isEmpty() : "Bouquet list should not be empty";
         }
+        logger.exiting(RecommendCommand.class.getName(), "askSaveBouquet");
     }
 }

src/main/java/florizz/command/RemoveFlowerCommand.java

@@ -7,8 +7,10 @@
 import florizz.objects.Flower;
 
 import java.util.ArrayList;
+import java.util.logging.Logger;
 
 public class RemoveFlowerCommand extends Command {
+    private static Logger logger = Logger.getLogger(RemoveFlowerCommand.class.getName());
     private String flowerName;
     private Integer quantity;
     private String bouquetName;
@@ -21,6 +23,8 @@ public RemoveFlowerCommand(String flowerName, int quantity, String bouquetName)
 
     @Override
     public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzException {
+        logger.entering(RemoveFlowerCommand.class.getName(), "execute");
+        assert !bouquetList.isEmpty() : "Bouquet list should not be empty";
         boolean doesBouquetExist = false;
         Bouquet bouquetToRemoveFlower = new Bouquet();
         for (int i = 0; !doesBouquetExist && i < bouquetList.size(); i++) {
@@ -56,6 +60,7 @@ public boolean execute(ArrayList<Bouquet> bouquetList, Ui ui) throws FlorizzExce
             ui.printRemoveFlowerUnsuccessful(bouquetList, flowerName, bouquetName);
         }
 
+        logger.exiting(RemoveFlowerCommand.class.getName(), "execute");
         return true;
     }
 }