Finally made backend for undo and redo!

src/main/java/com/nighthawk/spring_portfolio/mvc/classPeriod/ActionData.java

@@ -0,0 +1,64 @@
+package com.nighthawk.spring_portfolio.mvc.classPeriod;
+
+public class ActionData {
+    private String type; // Type of action (e.g., ADD_STUDENT, ADD_INSTRUCTOR)
+    private String id; // ID of the action (e.g., student ID, instructor ID)
+    private String name; // Name associated with the action (e.g., student name, instructor name)
+    private String email; // Email associated with the action (e.g., student email, instructor email)
+
+    // Constructors, getters, and setters
+    public ActionData() {
+        // Default constructor
+    }
+
+    public ActionData(String type, String id, String name, String email) {
+        this.type = type;
+        this.id = id;
+        this.name = name;
+        this.email = email;
+    }
+
+    // Getters and setters for each field
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    // toString method for debugging or logging
+    @Override
+    public String toString() {
+        return "ActionData{" +
+                "type='" + type + '\'' +
+                ", id='" + id + '\'' +
+                ", name='" + name + '\'' +
+                ", email='" + email + '\'' +
+                '}';
+    }
+}

src/main/java/com/nighthawk/spring_portfolio/mvc/classPeriod/UndoRedo.java

@@ -0,0 +1,55 @@
+package com.nighthawk.spring_portfolio.mvc.classPeriod;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+import java.util.Stack;
+import java.util.LinkedList;
+import java.util.Queue;
+
+@RestController
+public class UndoRedo {
+    private Stack<ActionData> undoStack;
+    private Stack<ActionData> redoStack;
+    private Queue<ActionData> actionsQueue;
+
+    public UndoRedo() {
+        undoStack = new Stack<>();
+        redoStack = new Stack<>();
+        actionsQueue = new LinkedList<>();
+    }
+
+    @PostMapping("/addAction")
+    public String addAction(@RequestBody ActionData actionData) {
+        undoStack.push(actionData);
+        redoStack.clear(); // Clear redo stack on new action
+        actionsQueue.add(actionData);
+        return "Action added: " + actionData.getType(); // Example: Assuming ActionData has a getType() method
+    }
+
+    @GetMapping("/undo")
+    public String undo() {
+        if (!undoStack.isEmpty()) {
+            ActionData actionData = undoStack.pop();
+            redoStack.push(actionData);
+            return "Undo action: " + actionData.getType();
+        }
+        return "No actions to undo";
+    }
+
+    @GetMapping("/redo")
+    public String redo() {
+        if (!redoStack.isEmpty()) {
+            ActionData actionData = redoStack.pop();
+            undoStack.push(actionData);
+            return "Redo action: " + actionData.getType();
+        }
+        return "No actions to redo";
+    }
+
+    @GetMapping("/getActionsQueue")
+    public Queue<ActionData> getActionsQueue() {
+        return actionsQueue;
+    }
+}