[R3] Find doctor by id use case class

src/main/java/com/mirna/hospitalmanagementapi/application/usecase/doctor/FindDoctorByIdUseCase.java

@@ -0,0 +1,32 @@
+package com.mirna.hospitalmanagementapi.application.usecase.doctor;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import com.mirna.hospitalmanagementapi.domain.entities.Doctor;
+import com.mirna.hospitalmanagementapi.domain.repositories.DoctorRepository;
+
+/**
+ * This class is used to execute the findById method 
+ * 
+ * @author Mirna Gama
+ * @version 1.0
+ */
+@Component
+public class FindDoctorByIdUseCase {
+
+	@Autowired
+	private DoctorRepository doctorRepository;
+	
+	/**
+	 * Executes the findById method from Doctor repository
+	 * 
+	 * @param id A long representing the doctor's unique identifier
+	 * 
+	 * @return The corresponding doctor if successful, or null if it is non-existent
+	 *
+	 */
+	public Doctor execute(Long id) {
+		return doctorRepository.findById(id).orElse(null);
+	}
+}