submission - David Bryant

pom.xml

@@ -23,10 +23,20 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-actuator</artifactId>
 		</dependency>
+<!--		<dependency>-->
+<!--			<groupId>org.springframework.boot</groupId>-->
+<!--			<artifactId>spring-boot-starter-data-jdbc</artifactId>-->
+<!--		</dependency>-->
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-data-jdbc</artifactId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<scope>provided</scope>
+		</dependency>
+
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>

src/main/java/com/zoomcare/candidatechallenge/controller/EmployeeController.java

@@ -0,0 +1,24 @@
+package com.zoomcare.candidatechallenge.controller;
+
+import com.zoomcare.candidatechallenge.model.EmployeeWithReports;
+import org.springframework.http.ResponseEntity;
+
+import java.util.List;
+
+public interface EmployeeController {
+
+    /**
+     * Returns a list of all top-level employees.
+     *
+     * @return the list of employees
+     */
+    ResponseEntity<List<EmployeeWithReports>> getAll();
+
+    /**
+     * Returns the employee with the given ID or a 404 response if no such employee exists.
+     *
+     * @param id the employee ID
+     * @return the employee
+     */
+    ResponseEntity<EmployeeWithReports> getById(Long id);
+}

src/main/java/com/zoomcare/candidatechallenge/controller/EmployeeControllerImpl.java

@@ -0,0 +1,35 @@
+package com.zoomcare.candidatechallenge.controller;
+
+import com.zoomcare.candidatechallenge.model.EmployeeWithReports;
+import com.zoomcare.candidatechallenge.service.EmployeeService;
+import lombok.AllArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+import java.util.Optional;
+
+
+@RestController
+@RequestMapping("/employees")
+@AllArgsConstructor
+public class EmployeeControllerImpl implements EmployeeController {
+
+    private EmployeeService employeeService;
+
+    @GetMapping("/all")
+    public ResponseEntity<List<EmployeeWithReports>> getAll() {
+        return ResponseEntity.ok(employeeService.getAll());
+    }
+
+    @GetMapping("/id/{id}")
+    public ResponseEntity<EmployeeWithReports> getById(@PathVariable Long id) {
+        return Optional.ofNullable(employeeService.getById(id))
+                .map(ResponseEntity::ok) // if exists, return 200 with body
+                .orElse(ResponseEntity.notFound().build()); // otherwise return a 404
+    }
+}
+

src/main/java/com/zoomcare/candidatechallenge/model/Employee.java

@@ -0,0 +1,23 @@
+package com.zoomcare.candidatechallenge.model;
+
+import lombok.Data;
+
+import javax.persistence.*;
+import java.util.HashMap;
+import java.util.Map;
+
+@Entity
+@Data
+public class Employee {
+
+    @Id
+    public Long id;
+
+    public Long supervisorId;
+
+    @ElementCollection
+    @MapKeyColumn(name = "key")
+    @Column(name = "value")
+    @CollectionTable(name = "property", joinColumns = @JoinColumn(name = "employee_id"))
+    public Map<String, String> properties = new HashMap<>();
+}

src/main/java/com/zoomcare/candidatechallenge/model/EmployeeWithReports.java

@@ -0,0 +1,18 @@
+package com.zoomcare.candidatechallenge.model;
+
+import lombok.Data;
+
+import java.util.List;
+import java.util.Map;
+
+@Data
+public class EmployeeWithReports {
+
+    private Long id;
+
+    private Long supervisorId;
+
+    private Map<String, String> properties;
+
+    private List<EmployeeWithReports> reports;
+}

src/main/java/com/zoomcare/candidatechallenge/repository/EmployeeRepository.java

@@ -0,0 +1,13 @@
+package com.zoomcare.candidatechallenge.repository;
+
+import com.zoomcare.candidatechallenge.model.Employee;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+public interface EmployeeRepository extends JpaRepository<Employee, Long> {
+
+    List<Employee> findBySupervisorId(Long supervisorId);
+
+    List<Employee> findBySupervisorIdIsNull();
+}

src/main/java/com/zoomcare/candidatechallenge/service/EmployeeService.java

@@ -0,0 +1,24 @@
+package com.zoomcare.candidatechallenge.service;
+
+import com.zoomcare.candidatechallenge.model.EmployeeWithReports;
+import org.springframework.web.bind.annotation.PathVariable;
+
+import java.util.List;
+
+public interface EmployeeService {
+
+    /**
+     * Returns all top-level employees.
+     *
+     * @return the list of employees
+     */
+    List<EmployeeWithReports> getAll();
+
+    /**
+     * Returns the employee with the given ID, or null if no such employee exists.
+     *
+     * @param id the employee ID
+     * @return the employee
+     */
+    EmployeeWithReports getById(@PathVariable Long id);
+}

src/main/java/com/zoomcare/candidatechallenge/service/EmployeeServiceImpl.java

@@ -0,0 +1,65 @@
+package com.zoomcare.candidatechallenge.service;
+
+import com.zoomcare.candidatechallenge.model.Employee;
+import com.zoomcare.candidatechallenge.model.EmployeeWithReports;
+import com.zoomcare.candidatechallenge.repository.EmployeeRepository;
+import lombok.AllArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.web.bind.annotation.PathVariable;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+@AllArgsConstructor
+public class EmployeeServiceImpl implements EmployeeService {
+
+    private EmployeeRepository employeeRepository;
+
+    public List<EmployeeWithReports> getAll() {
+        return employeeRepository
+                .findBySupervisorIdIsNull()
+                .stream()
+                .map(this::getEmployeeWithReports)
+                .collect(Collectors.toList());
+    }
+
+    public EmployeeWithReports getById(@PathVariable Long id) {
+        if (!employeeRepository.existsById(id)) {
+            return null;
+        }
+        return employeeRepository
+                .findById(id)
+                .map(this::getEmployeeWithReports)
+                .orElse(null);
+    }
+
+    /**
+     * Creates a new EmployeeWithReports object.
+     *
+     * @param employee the DAU instance to copy.
+     * @return an EmployeeWithReports object.
+     */
+    private EmployeeWithReports getEmployeeWithReports(Employee employee) {
+        EmployeeWithReports result = new EmployeeWithReports();
+        result.setId(employee.getId());
+        result.setSupervisorId(employee.getSupervisorId());
+        result.setProperties(employee.getProperties());
+        result.setReports(collectReportsFor(employee.getId()));
+        return result;
+    }
+
+    /**
+     * Recursively collects reports via findBySupervisorId.
+     *
+     * @param id the id of the superior employee.
+     * @return a list of reports.
+     */
+    private List<EmployeeWithReports> collectReportsFor(Long id) {
+        return employeeRepository
+                .findBySupervisorId(id)
+                .stream()
+                .map(this::getEmployeeWithReports)
+                .collect(Collectors.toList());
+    }
+}