Outsource business logic from Ui to Commands

Author: wendelinwemhoener

src/main/java/seedu/duke/flashcard/FlashcardCommandParser.java

@@ -1,16 +1,15 @@
 package seedu.duke.flashcard;
 
-import seedu.duke.flashcard.command.CreateFlashcardCommand;
-import seedu.duke.flashcard.command.FlashcardCommand;
-import seedu.duke.flashcard.command.ListFlashcardsCommand;
-import seedu.duke.flashcard.command.UnknownCommand;
+import seedu.duke.flashcard.command.*;
 
 public class FlashcardCommandParser {
     public FlashcardCommand parseInput(String input) {
         if (input.startsWith("create flashcard")) {
             return new CreateFlashcardCommand();
         } else if (input.startsWith("list flashcards")) {
             return new ListFlashcardsCommand();
+        } else if (input.startsWith("start review")) {
+            return new StartReviewCommand();
         }
 
         return new UnknownCommand();

src/main/java/seedu/duke/flashcard/FlashcardUi.java

@@ -1,8 +1,6 @@
 package seedu.duke.flashcard;
 
-import seedu.duke.flashcard.command.CreateFlashcardCommand;
 import seedu.duke.flashcard.command.FlashcardCommand;
-import seedu.duke.flashcard.command.ListFlashcardsCommand;
 
 import java.util.Scanner;
 
@@ -16,27 +14,6 @@ public FlashcardUi(FlashcardList flashcardList) {
     }
 
     public void executeCommand(FlashcardCommand command) {
-        if (command instanceof CreateFlashcardCommand) {
-            executeCreateFlashcardCommand();
-        } else if (command instanceof ListFlashcardsCommand) {
-            listFlashcards();
-        }
-    }
-
-    private void executeCreateFlashcardCommand() {
-        System.out.print("Enter the front page text: ");
-        String frontPageText = scanner.nextLine();
-        System.out.print("Enter the back page text: ");
-        String backPageText = scanner.nextLine();
-
-        Flashcard flashcard = new Flashcard(frontPageText, backPageText);
-
-        flashcardList.add(flashcard);
-    }
-
-    public void listFlashcards() {
-        for (Flashcard flashcard : flashcardList.getFlashcards()) {
-            System.out.println(flashcard);
-        }
+        command.execute(scanner, flashcardList);
     }
 }

src/main/java/seedu/duke/flashcard/command/CreateFlashcardCommand.java

@@ -1,4 +1,19 @@
 package seedu.duke.flashcard.command;
 
+import seedu.duke.flashcard.Flashcard;
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
 public class CreateFlashcardCommand extends FlashcardCommand {
+    public void execute(Scanner scanner, FlashcardList flashcardList) {
+        System.out.print("Enter the front page text: ");
+        String frontPageText = scanner.nextLine();
+        System.out.print("Enter the back page text: ");
+        String backPageText = scanner.nextLine();
+
+        Flashcard flashcard = new Flashcard(frontPageText, backPageText);
+
+        flashcardList.add(flashcard);
+    }
 }

src/main/java/seedu/duke/flashcard/command/FlashcardCommand.java

@@ -1,4 +1,9 @@
 package seedu.duke.flashcard.command;
 
-public class FlashcardCommand {
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
+public abstract class FlashcardCommand {
+    public abstract void execute(Scanner scanner, FlashcardList flashcardList);
 }

src/main/java/seedu/duke/flashcard/command/ListFlashcardsCommand.java

@@ -1,4 +1,14 @@
 package seedu.duke.flashcard.command;
 
+import seedu.duke.flashcard.Flashcard;
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
 public class ListFlashcardsCommand extends FlashcardCommand {
+    public void execute(Scanner scanner, FlashcardList flashcardList) {
+        for (Flashcard flashcard : flashcardList.getFlashcards()) {
+            System.out.println(flashcard);
+        }
+    }
 }

src/main/java/seedu/duke/flashcard/command/StartReviewCommand.java

@@ -0,0 +1,11 @@
+package seedu.duke.flashcard.command;
+
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
+public class StartReviewCommand extends FlashcardCommand {
+    public void execute(Scanner scanner, FlashcardList flashcardList) {
+        System.out.println("");
+    }
+}

src/main/java/seedu/duke/flashcard/command/UnknownCommand.java

@@ -1,4 +1,11 @@
 package seedu.duke.flashcard.command;
 
+import seedu.duke.flashcard.FlashcardList;
+
+import java.util.Scanner;
+
 public class UnknownCommand extends FlashcardCommand {
+    public void execute(Scanner scanner, FlashcardList flashcardList) {
+        System.out.println("Unknown command! Please try again.");
+    }
 }