Added a ton of entities.

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/BasicEntity.java

@@ -0,0 +1,36 @@
+package nl.andrewlalis.teaching_assistant_assistant.model;
+
+import org.hibernate.annotations.CreationTimestamp;
+
+import javax.persistence.*;
+import java.util.Date;
+
+/**
+ * The basic entity properties which any entity in this system should have: an id and a creation timestamp. Every entity
+ * in this system should extend from BasicEntity.
+ */
+@MappedSuperclass
+public class BasicEntity {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @Temporal(
+            value = TemporalType.TIMESTAMP
+    )
+    @CreationTimestamp
+    @Column
+    private Date createdOn;
+
+    protected BasicEntity() {}
+
+    public Long getId() {
+        return this.id;
+    }
+
+    public Date getCreatedOn() {
+        return this.createdOn;
+    }
+
+}

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/Course.java

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+package nl.andrewlalis.teaching_assistant_assistant.model;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Inheritance;
+import javax.persistence.InheritanceType;
+
+/**
+ * Represents a course, containing many students and teaching assistants, as well as a collection of assignments.
+ */
+@Entity
+@Inheritance(
+        strategy = InheritanceType.JOINED
+)
+public class Course extends BasicEntity {
+
+    @Column(unique = true, nullable = false)
+    private String name;
+
+    @Column(unique = true, nullable = false)
+    private String code;
+
+    /**
+     * Default constructor for JPA.
+     */
+    protected Course() {}
+
+}

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/assignments/Assignment.java

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+package nl.andrewlalis.teaching_assistant_assistant.model.assignments;
+
+import nl.andrewlalis.teaching_assistant_assistant.model.BasicEntity;
+import nl.andrewlalis.teaching_assistant_assistant.model.Course;
+
+import javax.persistence.*;
+import java.util.List;
+
+/**
+ * Represents a single assignment for a course.
+ */
+@Entity
+@Inheritance(
+        strategy = InheritanceType.JOINED
+)
+public class Assignment extends BasicEntity {
+
+    /**
+     * The parent course to which this assignment belongs.
+     */
+    @ManyToOne(
+            fetch = FetchType.LAZY,
+            optional = false
+    )
+    private Course course;
+
+    /**
+     * The list of sections which comprise this assignment.
+     */
+    @OneToMany(
+            fetch = FetchType.EAGER,
+            orphanRemoval = true
+    )
+    private List<AssignmentSection> sections;
+
+
+}

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/assignments/AssignmentSection.java

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+package nl.andrewlalis.teaching_assistant_assistant.model.assignments;
+
+import nl.andrewlalis.teaching_assistant_assistant.model.BasicEntity;
+
+import javax.persistence.*;
+
+/**
+ * An Assignment is comprised of one or more sections, each of which has its own grade and feedback.
+ */
+@Entity
+@Inheritance(
+        strategy = InheritanceType.JOINED
+)
+public class AssignmentSection extends BasicEntity {
+
+    /**
+     * The parent assignment to which this section belongs.
+     */
+    @ManyToOne(
+            fetch = FetchType.LAZY,
+            optional = false
+    )
+    private Assignment assignment;
+
+}

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/assignments/Feedback.java

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+package nl.andrewlalis.teaching_assistant_assistant.model.assignments;
+
+import nl.andrewlalis.teaching_assistant_assistant.model.BasicEntity;
+
+import javax.persistence.*;
+
+/**
+ * The feedback given by a teaching assistant to a student or group regarding a particular section of an assignment.
+ */
+@Entity
+@Inheritance(
+        strategy = InheritanceType.JOINED
+)
+public abstract class Feedback extends BasicEntity {
+
+    /**
+     * The section to which this feedback belongs.
+     */
+    @ManyToOne(
+            fetch = FetchType.LAZY,
+            optional = false
+    )
+    private AssignmentSection assignmentSection;
+
+
+
+}

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/people/Person.java

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+package nl.andrewlalis.teaching_assistant_assistant.model.people;
+
+import nl.andrewlalis.teaching_assistant_assistant.model.BasicEntity;
+
+import javax.persistence.*;
+
+/**
+ * Represents any person (teaching assistant, student, or other) that exists in this application.
+ */
+@Entity
+@Inheritance(
+        strategy = InheritanceType.JOINED
+)
+public class Person extends BasicEntity {
+
+    @Column(nullable = false)
+    private String firstName;
+
+    @Column(nullable = false)
+    private String lastName;
+
+    @Column
+    private String emailAddress;
+
+    /**
+     * Default constructor for JPA.
+     */
+    protected Person () {}
+
+    /**
+     * Constructs a new Person.
+     * @param firstName The person's first name.
+     * @param lastName The person's last name.
+     * @param emailAddress The person's email address.
+     */
+    public Person(String firstName, String lastName, String emailAddress) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.emailAddress = emailAddress;
+    }
+
+}

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/people/Student.java

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+package nl.andrewlalis.teaching_assistant_assistant.model.people;
+
+import javax.persistence.Entity;
+
+/**
+ * Represents a student, or someone enrolled and submitting assignments for a course.
+ */
+@Entity
+public class Student extends Person {
+
+}

src/main/java/nl/andrewlalis/teaching_assistant_assistant/model/people/TeachingAssistant.java

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+package nl.andrewlalis.teaching_assistant_assistant.model.people;
+
+import javax.persistence.Entity;
+
+/**
+ * Represents a teaching assistant of a course, or in other words, a grader and administrator.
+ */
+@Entity
+public class TeachingAssistant extends Person {
+}