src/main/java/nl/andrewlalis/Main.java

@@ -1,11 +1,10 @@
 package nl.andrewlalis;
 
-import nl.andrewlalis.database.Database;
+import nl.andrewlalis.model.database.Database;
 import nl.andrewlalis.git_api.GithubManager;
 import nl.andrewlalis.model.Student;
 import nl.andrewlalis.model.StudentTeam;
 import nl.andrewlalis.util.CommandLine;
-import nl.andrewlalis.util.FileUtils;
 import nl.andrewlalis.util.Logging;
 import nl.andrewlalis.util.TeamGenerator;
 

src/main/java/nl/andrewlalis/git_api/GithubManager.java

@@ -2,6 +2,7 @@ package nl.andrewlalis.git_api;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import jdk.nashorn.internal.ir.annotations.Ignore;
 import nl.andrewlalis.model.Student;
 import nl.andrewlalis.model.StudentTeam;
 import org.apache.http.HttpResponse;
@@ -88,7 +89,7 @@ public class GithubManager {
 
         StudentTeam t = new StudentTeam();
         Student s = new Student(3050831, "Andrew Lalis", "andrewlalisofficial@gmail.com", "andrewlalis", null);
-        t.addStudent(s);
+        t.addMember(s);
         t.setId(42);
 
         this.setupStudentTeam(t, teamAll);
@@ -99,6 +100,7 @@ public class GithubManager {
      * @param allTeachingAssistants A team consisting of all teaching assistants.
      * @throws IOException If an HTTP request failed.
      */
+    @SuppressWarnings("deprecation")
     private void setupAssignmentsRepo(GHTeam allTeachingAssistants) throws IOException {
         // Check if the repository already exists.
         GHRepository existingRepo = this.organization.getRepository(this.assignmentsRepoName);
@@ -139,10 +141,11 @@ public class GithubManager {
      * @param taTeam The team of teaching assistants that is responsible for these students.
      * @throws IOException If an HTTP request fails.
      */
+    @SuppressWarnings("deprecation")
     private void setupStudentTeam(StudentTeam team, GHTeam taTeam) throws IOException {
         String teamRepoName = team.generateUniqueName(this.studentRepoPrefix);
 
-        List<Student> students = team.getStudents();
+        Student[] students = team.getStudents();
         StringBuilder description = new StringBuilder("Group ");
         description.append(team.getId()).append(": ");
 

src/main/java/nl/andrewlalis/model/Storable.java

@@ -0,0 +1,18 @@
+package nl.andrewlalis.model;
+
+import java.sql.Connection;
+
+/**
+ * Defines objects which may be stored in the database, and requires that they implement methods for both storage and
+ * retrieval of the objects.
+ */
+public interface Storable {
+
+    /**
+     * Stores the object in the database.
+     * @param connection The connection to the database which can be used for preparation of and execution of queries.
+     * @return True if the object is successfully stored, false if an error occurred.
+     */
+    boolean store(Connection connection);
+
+}

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

@@ -39,9 +39,9 @@ public class Student extends Person {
     public StudentTeam getPreferredTeam(Map<Integer, Student> studentMap) {
         StudentTeam t = new StudentTeam();
         for (int partnerNumber : this.getPreferredPartners()) {
-            t.addStudent(studentMap.get(partnerNumber));
+            t.addMember(studentMap.get(partnerNumber));
         }
-        t.addStudent(this);
+        t.addMember(this);
         return t;
     }
 }

src/main/java/nl/andrewlalis/model/StudentTeam.java

@@ -1,74 +1,22 @@
 package nl.andrewlalis.model;
 
-import java.util.ArrayList;
+import java.util.Arrays;
-import java.util.List;
 
 /**
  * Represents one or more students' collective information.
  */
-public class StudentTeam {
+public class StudentTeam extends Team{
-
-    /**
-     * The list of students in this team.
-     */
-    private List<Student> students;
-
-    /**
-     * The team identification number.
-     */
-    private int id;
 
     public StudentTeam() {
-        this.students = new ArrayList<>();
+        super(-1);
-        this.id = -1;
     }
 
     /**
-     * Determines if a student is already included in this team.
+     * Gets a list of students, casted from the original Person[].
-     * @param student A student.
+     * @return An array of Students.
-     * @return True if the student is in this team, false otherwise.
      */
-    public boolean hasStudent(Student student) {
+    public Student[] getStudents() {
-        for (Student s : this.students) {
+        return Arrays.copyOf(this.getMembers(), this.memberCount(), Student[].class);
-            if (s.equals(student)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    public int getStudentCount() {
-        return this.students.size();
-    }
-
-    public int getId() {
-        return this.id;
-    }
-
-    public void setId(int id) {
-        this.id = id;
-    }
-
-    public void setStudents(List<Student> students) {
-        this.students = students;
-    }
-
-    public List<Student> getStudents() {
-        return this.students;
-    }
-
-    /**
-     * Adds a student to this team.
-     * @param student The student to add.
-     * @return True if the student could be added, false otherwise.
-     */
-    public boolean addStudent(Student student) {
-        if (!this.hasStudent(student)) {
-            this.students.add(student);
-            return true;
-        } else {
-            return false;
-        }
     }
 
     /**
@@ -81,10 +29,9 @@ public class StudentTeam {
      * @return True if the team is valid, and false otherwise.
      */
     public boolean isValid(int teamSize) {
-        if (this.getStudentCount() == teamSize) {
+        if (this.memberCount() == teamSize) {
-            List<Integer> encounteredIds = new ArrayList<>();
+            for (Student studentA : this.getStudents()) {
-            for (Student studentA : this.students) {
+                for (Student studentB : this.getStudents()) {
-                for (Student studentB : this.students) {
                     if (!studentA.equals(studentB) && !studentA.getPreferredPartners().contains(studentB.getNumber())) {
                         return false;
                     }
@@ -105,48 +52,9 @@ public class StudentTeam {
     public String generateUniqueName(String prefix) {
         StringBuilder sb = new StringBuilder(prefix);
         sb.append("_team_").append(this.id);
-        for (Student s : this.students) {
+        for (Student s : (Student[]) this.getMembers()) {
             sb.append('_').append(s.getNumber());
         }
         return sb.toString();
     }
-
-    /**
-     * Returns a pretty formatting of this team so that it can be viewed in the command line. This is mainly for
-     * debugging purposes.
-     * @return A string representing the team.
-     */
-    @Override
-    public String toString() {
-        StringBuilder sb = new StringBuilder("StudentTeam: ");
-        sb.append(this.id).append('\n');
-        for (Student s : this.students) {
-            sb.append('\t').append(s.toString()).append('\n');
-        }
-        return sb.toString();
-    }
-
-    /**
-     * Determines if one team is equivalent to another. This is determined by if the two teams are comprised of the same
-     * students, in any order.
-     * @param o The object to compare to this team.
-     * @return True if the teams contain the same students, false otherwise.
-     */
-    @Override
-    public boolean equals(Object o) {
-        if (o instanceof StudentTeam) {
-            StudentTeam t = (StudentTeam) o;
-            if (t.getStudentCount() != this.getStudentCount()) {
-                return false;
-            }
-            for (Student s : this.students) {
-                if (!t.hasStudent(s)) {
-                    return false;
-                }
-            }
-            return true;
-        } else {
-            return false;
-        }
-    }
 }

src/main/java/nl/andrewlalis/model/Team.java

@@ -0,0 +1,153 @@
+package nl.andrewlalis.model;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * An abstract Team object from which both Teaching Assistant and Student teams can be built.
+ */
+public abstract class Team {
+
+    /**
+     * An identification number unique to this team alone.
+     */
+    protected int id;
+
+    /**
+     * A list of members of this team.
+     */
+    private List<Person> members;
+
+    /**
+     * Constructs this team with the given id.
+     * @param id The id to assign to this team.
+     */
+    public Team(int id) {
+        this.id = id;
+        this.members = new ArrayList<>();
+    }
+
+    /**
+     * @param newId The new id number to assign to this team.
+     */
+    public void setId(int newId) {
+        this.id = newId;
+    }
+
+    /**
+     * @return This team's id number.
+     */
+    public int getId() {
+        return this.id;
+    }
+
+    /**
+     * Adds a new person to this team, only if they do not exist in this team yet.
+     * @param newMember The new member to add.
+     */
+    public void addMember(Person newMember) {
+        for (Person person : this.members) {
+            if (person.equals(newMember)) {
+                return;
+            }
+        }
+        this.members.add(newMember);
+    }
+
+    /**
+     * Removes a person from this team.
+     * @param person The person to remove.
+     */
+    public void removeMember(Person person) {
+        this.members.remove(person);
+    }
+
+    /**
+     * Checks if this team contains the given person.
+     * @param person The person to check for.
+     * @return True if the person is a member of this team, false otherwise.
+     */
+    public boolean containsMember(Person person) {
+        for (Person p : this.members) {
+            if (p.equals(person)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Sets the team to be comprised of only the members given in the array.
+     * @param people The people which will make up the members of this team.
+     */
+    public void setMembers(Person[] people) {
+        this.members = new ArrayList<>(Arrays.asList(people));
+    }
+
+    /**
+     * Gets a list of people in this team.
+     * @return A list of people in this team.
+     */
+    public Person[] getMembers() {
+        Person[] people = new Person[this.memberCount()];
+        this.members.toArray(people);
+        return people;
+    }
+
+    /**
+     * Gets the number of people in this team.
+     * @return The number of people in this team.
+     */
+    public int memberCount() {
+        return this.members.size();
+    }
+
+    /**
+     * Determines if another team has the same members as this team.
+     * @param team The team to compare to this team.
+     * @return True if the other team has all the same members as this team.
+     */
+    public boolean hasSameMembers(Team team) {
+        if (this.memberCount() == team.memberCount()) {
+            for (Person person : this.members) {
+                if (!team.containsMember(person)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Checks if an object is equal to this team. First checks if the other object is a Team, and then if it has the
+     * same id and team size. If both of those conditions are met, then it will check that all team members are the
+     * same.
+     * @param obj The object to check for equality.
+     * @return True if the two objects represent the same team, or false otherwise.
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof Team) {
+            Team team = (Team) obj;
+            if (team.getId() == this.getId() && this.hasSameMembers(team)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * @return A String containing a line for each member in the team.
+     */
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for (Person person : this.members) {
+            sb.append(person.toString()).append('\n');
+        }
+        return sb.toString();
+    }
+
+}

src/main/java/nl/andrewlalis/model/database/Database.java

@@ -1,11 +1,11 @@
-package nl.andrewlalis.database;
+package nl.andrewlalis.model.database;
 
 import nl.andrewlalis.model.Person;
 import nl.andrewlalis.model.Student;
 import nl.andrewlalis.model.TeachingAssistant;
-import nl.andrewlalis.util.FileUtils;
 
 import java.sql.*;
+import java.util.List;
 import java.util.logging.Logger;
 
 /**
@@ -53,20 +53,15 @@ public class Database {
      * @return True, if successful, false if not.
      */
     public boolean initialize() {
-        String sql = FileUtils.readStringFromFile("/sql/table_init.sql");
+        List<PreparedStatement> statements = Utils.prepareStatementsFromFile("/sql/table_init.sql", this.connection);
-        String[] commands = sql.split(";");
+        for (PreparedStatement statement : statements) {
-        for (String command : commands) {
-            logger.finest("Executing command: " + command);
-            if (command.trim().length() > 1) {
             try {
-                    PreparedStatement statement = this.connection.prepareStatement(command);
                 statement.execute();
             } catch (SQLException e) {
-                    logger.severe("SQLException: " + e.getErrorCode());
+                logger.severe("SQLException while executing prepared statement: " + statement.toString() + ". Code: " + e.getErrorCode());
                 return false;
             }
         }
-        }
         logger.fine("Database initialized.");
         return true;
     }

src/main/java/nl/andrewlalis/model/database/Utils.java

@@ -0,0 +1,52 @@
+package nl.andrewlalis.model.database;
+
+import nl.andrewlalis.util.FileUtils;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Logger;
+
+/**
+ * Contains some methods which make database actions much easier.
+ */
+public class Utils {
+
+    /**
+     * The logger for outputting debug info.
+     */
+    private static final Logger logger = Logger.getLogger(Utils.class.getName());
+    static {
+        logger.setParent(Logger.getGlobal());
+    }
+
+    /**
+     * Gets an ordered list of prepared statements from a file which contains multiple statements separated by a
+     * semicolon. This method separates those statements into their own strings, and prepares them individually to be
+     * executed later.
+     * @param filename The name of the file which contains the statements.
+     * @param connection The connection to a database; used to prepare statements.
+     * @return An ordered list of prepared statements which are based on the contents of the file provided.
+     */
+    public static List<PreparedStatement> prepareStatementsFromFile(String filename, Connection connection) {
+        String string = FileUtils.readStringFromFile(filename);
+        if (string == null || string.isEmpty()) {
+            return new ArrayList<>();
+        }
+        String[] splits = string.split(";");
+        List<PreparedStatement> statements = new ArrayList<>();
+        for (String split : splits) {
+            if (split.trim().length() > 1) {
+                try {
+                    statements.add(connection.prepareStatement(split));
+                } catch (SQLException e) {
+                    logger.severe("SQLException while preparing a statement:\n" + split + "\nError Code: " + e.getErrorCode());
+                }
+            }
+        }
+        return statements;
+    }
+
+}

src/main/java/nl/andrewlalis/util/TeamGenerator.java

@@ -80,15 +80,15 @@ public class TeamGenerator {
         // For each student, try to make a team from its preferred partners.
         for (Map.Entry<Integer, Student> e : studentMap.entrySet()) {
             StudentTeam newTeam = e.getValue().getPreferredTeam(studentMap);
-            logger.finest("Checking if student's preferred team is valid: " + newTeam.getStudents());
+            logger.finest("Checking if student's preferred team is valid:\n" + newTeam);
             // Check if the team is of a valid size, and is not a duplicate.
             // Note that at this stage, singles are treated as studentTeams of 1, and thus not valid for any teamSize > 1.
             if (newTeam.isValid(teamSize) && !studentTeams.contains(newTeam)) {
                 // Once we know this team is completely valid, we remove all the students in it from the list of singles.
                 newTeam.setId(teamCount++);
-                singleStudents.removeAll(newTeam.getStudents());
+                singleStudents.removeAll(Arrays.asList(newTeam.getStudents()));
                 studentTeams.add(newTeam);
-                logger.fine("Created team: " + newTeam);
+                logger.fine("Created team:\n" + newTeam);
             }
         }
 
@@ -109,11 +109,11 @@ public class TeamGenerator {
         while (!singleStudents.isEmpty()) {
             StudentTeam t = new StudentTeam();
             t.setId(teamIndex++);
-            logger.fine("Creating new team of single students: " + t);
+            logger.fine("Creating new team of single students:\n" + t);
-            while (t.getStudentCount() < teamSize && !singleStudents.isEmpty()) {
+            while (t.memberCount() < teamSize && !singleStudents.isEmpty()) {
                 Student s = singleStudents.remove(0);
                 logger.finest("Single student: " + s);
-                t.addStudent(s);
+                t.addMember(s);
             }
             studentTeams.add(t);
             logger.fine("Created team: " + t);