feat: get patch and delete for a task

todolist/src/main/java/com/scaler/todolist/controllers/TasksController.java

@@ -1,10 +1,12 @@
 package com.scaler.todolist.controllers;
 
+import com.scaler.todolist.exceptions.ErrorMessages;
+import com.scaler.todolist.exceptions.TaskServiceException;
 import com.scaler.todolist.models.Task;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
-import java.net.http.HttpResponse;
+import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -39,5 +41,33 @@ ResponseEntity<Task> addNewTask(@RequestBody Task task) {
      *          if task 5 does not exist, send 404
      */
 
+    @GetMapping("/{id}")
+    public ResponseEntity<Task> getTask(@PathVariable int id){
+        int index = id - 1;
+        if(index >= taskList.size()) throw new TaskServiceException(ErrorMessages.INVALID_TASK_ID.getErrorMessage());
 
+        return ResponseEntity.status(200).body(taskList.get(index));
+    }
+
+    @PatchMapping("/{id}")
+    public ResponseEntity<Task> updateTask(@PathVariable int id, @RequestBody Task reqBody){
+        int index = id - 1;
+        if(index >= taskList.size()) throw new TaskServiceException(ErrorMessages.INVALID_TASK_ID.getErrorMessage());
+
+        Task toUpdate = taskList.get(index);
+        if(reqBody.getDue() != null)toUpdate.setDue(reqBody.getDue());
+        if(reqBody.getDone() != null)toUpdate.setDone(reqBody.getDone());
+        taskList.set(index, toUpdate);
+        return  ResponseEntity.status(200).body(toUpdate);
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<String> deleteTask(@PathVariable int id){
+        int index = id - 1;
+        if(index >= taskList.size()) throw new TaskServiceException(ErrorMessages.INVALID_TASK_ID.getErrorMessage());
+
+        taskList.remove(index);
+
+        return ResponseEntity.status(202).body("Task successfully deleted");
+    }
 }

todolist/src/main/java/com/scaler/todolist/exceptions/AppExceptionHandler.java

@@ -0,0 +1,24 @@
+package com.scaler.todolist.exceptions;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.context.request.WebRequest;
+
+import java.util.Date;
+
+@ControllerAdvice
+public class AppExceptionHandler {
+
+    @ExceptionHandler(value={TaskServiceException.class})
+    public ResponseEntity<Object> handleTaskServiceException(TaskServiceException ex, WebRequest request){
+        ErrorMessage errorMessage = new ErrorMessage(new Date(), ex.getMessage());
+        ResponseEntity<Object> objectResponseEntity = new ResponseEntity<>(errorMessage, new HttpHeaders(), HttpStatus.NOT_FOUND);
+
+        return  objectResponseEntity;
+    }
+
+
+}

todolist/src/main/java/com/scaler/todolist/exceptions/ErrorMessage.java

@@ -0,0 +1,16 @@
+package com.scaler.todolist.exceptions;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Date;
+
+@Setter
+@Getter
+@AllArgsConstructor
+public class ErrorMessage {
+    private Date timestamp;
+    private String message;
+
+}

todolist/src/main/java/com/scaler/todolist/exceptions/ErrorMessages.java

@@ -0,0 +1,19 @@
+package com.scaler.todolist.exceptions;
+
+import lombok.Getter;
+
+@Getter
+public enum ErrorMessages {
+    INVALID_TASK_ID("Invalid task Id");
+
+
+    private String errorMessage;
+
+    ErrorMessages(String errorMessage){
+        this.errorMessage = errorMessage;
+    }
+
+    public void setErrorMessage(String errorMessage){
+        this.errorMessage = errorMessage;
+    }
+}

todolist/src/main/java/com/scaler/todolist/exceptions/TaskServiceException.java

@@ -0,0 +1,7 @@
+package com.scaler.todolist.exceptions;
+
+public class TaskServiceException extends RuntimeException{
+    public TaskServiceException(String message) {
+        super(message);
+    }
+}