Group Management

src/main/java/longah/LongAh.java

@@ -29,8 +29,9 @@ public static void main(String[] args) {
 
         Logging.logInfo("Starting Pre-program preparations.");
         try {
-            group = new Group("group"); // Give a temporary name for now
             new PINHandler();
+            String groupName = UI.getGroupName();
+            group = new Group(groupName);
         } catch (LongAhException e) {
             LongAhException.printException(e);
         }
@@ -46,6 +47,10 @@ public static void main(String[] args) {
                 Command c = InputHandler.parseInput(command);
                 c.execute(group);
 
+                if (c.isSwitch()) {
+                    group = new Group(c.getTaskExpression());
+                    UI.showMessage("Switched to group: " + group.getGroupName());
+                }
                 // Check will not be reached if exception is thrown
                 if (c.isExit()) {
                     System.exit(0);

src/main/java/longah/commands/Command.java

@@ -34,6 +34,12 @@ public boolean isExit() {
         return false;
     }
 
+    /**
+     * Returns whether the current command is a switch command or not.
+     */
+    public boolean isSwitch() {
+        return false;
+    }
     /**
      * Returns the command string.
      * 

src/main/java/longah/commands/SwitchCommand.java

@@ -0,0 +1,38 @@
+package longah.commands;
+
+import longah.exception.ExceptionMessage;
+import longah.exception.LongAhException;
+import longah.node.Group;
+
+public class SwitchCommand extends Command {
+    /**
+     * Constructor for SwitchCommand.
+     *
+     * @param commandString The command string.
+     * @param taskExpression The task expression.
+     */
+    public SwitchCommand(String commandString, String taskExpression) {
+        super(commandString, taskExpression);
+    }
+
+    /**
+     * Executes the switch command.
+     *
+     * @param group The group to execute the command on.
+     */
+    public void execute(Group group) throws LongAhException {
+        if (this.taskExpression.isEmpty()) {
+            throw new LongAhException(ExceptionMessage.INVALID_SWITCH_GROUP_COMMAND);
+        }
+    }
+
+    /**
+     * Returns whether the current command is a switch command or not.
+     *
+     * @return True if the command is a switch command, false otherwise.
+     */
+    @Override
+    public boolean isSwitch() {
+        return true;
+    }
+}

src/main/java/longah/exception/ExceptionMessage.java

@@ -64,7 +64,9 @@ public enum ExceptionMessage {
     INVALID_EXIT_COMMAND ("Invalid command format." +
             " Use 'exit'", ExceptionType.INFO),
     INVALID_HELP_COMMAND ("Invalid command format." +
-            " Use 'help'", ExceptionType.INFO);
+            " Use 'help'", ExceptionType.INFO),
+    INVALID_SWITCH_GROUP_COMMAND ("Invalid command format." +
+            " Use 'switchgroup GROUP_NAME'", ExceptionType.INFO);
 
     private final String message;
     private final ExceptionType type;

src/main/java/longah/handler/InputHandler.java

@@ -1,16 +1,17 @@
 package longah.handler;
 
-import longah.commands.ClearCommand;
 import longah.commands.Command;
-import longah.commands.ExitCommand;
-import longah.commands.HelpCommand;
-import longah.commands.PINCommand;
-import longah.commands.SettleCommand;
 import longah.commands.add.AddCommand;
 import longah.commands.delete.DeleteCommand;
 import longah.commands.edit.EditCommand;
 import longah.commands.find.FindCommand;
 import longah.commands.list.ListCommand;
+import longah.commands.SettleCommand;
+import longah.commands.ClearCommand;
+import longah.commands.ExitCommand;
+import longah.commands.PINCommand;
+import longah.commands.SwitchCommand;
+import longah.commands.HelpCommand;
 import longah.exception.ExceptionMessage;
 import longah.exception.LongAhException;
 
@@ -63,6 +64,8 @@ public static Command parseCommand(String commandString, String taskExpression)
             // Fallthrough
         case "chart":
             throw new LongAhException(ExceptionMessage.COMMAND_NOT_IMPLEMENTED);
+        case "switchgroup":
+            return new SwitchCommand(commandString, taskExpression);
         default:
             throw new LongAhException(ExceptionMessage.INVALID_COMMAND);
         }

src/main/java/longah/handler/StorageHandler.java

@@ -43,7 +43,11 @@ public class StorageHandler {
     /**
      * Initializes a new StorageHandler instance.
      * Each instance handles the data storage requirements of each group of members.
-     * 
+     *
+     * @param members The MemberList object to store the members data
+     * @param transactions The TransactionList object to store the transactions data
+     * @param groupName The name of the group to store the data
+     *
      * @throws LongAhException If the data files are not created
      */
     public StorageHandler(MemberList members, TransactionList transactions, String groupName)

src/main/java/longah/handler/UI.java

@@ -87,4 +87,8 @@ public static void printSeparator() {
         System.out.println(SEPARATOR);
     }
 
+    public static String getGroupName() {
+        showMessage("Create a new group or enter the name of your group to manage:");
+        return getUserInput();
+    }
 }

src/main/java/longah/node/Transaction.java

@@ -193,7 +193,7 @@ public boolean isLender(String memberName) {
      * @param memberName String representation of member name to check
      * @return a boolean value determining whether the input name is a borrower in the transaction
      */
-    public boolean isBorrower(String memberName) {
+    public boolean checkIsBorrower(String memberName) {
         for (Subtransaction subtransaction : this.subtransactions) {
             if (subtransaction.getBorrower().isName(memberName)) {
                 return true;
@@ -209,7 +209,7 @@ public boolean isBorrower(String memberName) {
      * @return a boolean value determining whether the input name is involved in the transaction
      */
     public boolean isInvolved(String memberName) {
-        return isLender(memberName) || isBorrower(memberName);
+        return isLender(memberName) || checkIsBorrower(memberName);
     }
 
     /**

src/main/java/longah/util/TransactionList.java

@@ -125,7 +125,7 @@ public String findBorrower(String borrowerName) throws LongAhException {
         int index = 1;
         String outString = String.format("%s owns the following list of transactions.", borrowerName) + "\n";
         for (Transaction transaction : this.transactions) {
-            if (transaction.isBorrower(borrowerName)) {
+            if (transaction.checkIsBorrower(borrowerName)) {
                 outString = outString + String.format("%d.\n%s", index, transaction) + "\n";
                 index++;
             }
@@ -193,7 +193,7 @@ public String findDebts(String borrowerName) throws LongAhException {
                 , borrowerName) + "\n";
         int index = 1;
         for (Transaction transaction : this.transactions) {
-            if (transaction.isBorrower(borrowerName)) {
+            if (transaction.checkIsBorrower(borrowerName)) {
                 outString = outString + String.format("%d.\n%s", index, transaction) + "\n";
                 index++;
             }

text-ui-test/EXPECTED.TXT

@@ -2,6 +2,7 @@ Welcome to LongAh!
 Error reading saved PIN and authentication enabled state.
 Create your 6-digit PIN:
 PIN saved successfully! You can enter 'pin disable' to login automatically upon startup.
+Create a new group or enter the name of your group to manage:
 Enter command: Invalid command. Use 'help' to see the list of commands.
 Enter command: Enter command: Enter command: Amy: $0.0
 Brandon: $0.0

text-ui-test/input.txt

@@ -1,5 +1,6 @@
 123456
-123456
+test group
+test
 add member Amy
 add member Brandon
 list members