Lesson 5 is done

app/src/main/java/com/example/paktalin/agilejava/BasicGradingStrategy.java

+package com.example.paktalin.agilejava;
+
+/**
+ * Created by Paktalin on 18/05/2018.
+ */
+
+class BasicGradingStrategy implements GradingStrategy {
+    @Override
+    public int getGradePointsFor(Student.Grade grade) {
+        if(grade == Student.Grade.A) return 4;
+        if(grade == Student.Grade.B) return 3;
+        if(grade == Student.Grade.C) return 2;
+        if(grade == Student.Grade.D) return 1;
+        return 0;
+    }
+}

app/src/main/java/com/example/paktalin/agilejava/CourseReport.java

+package com.example.paktalin.agilejava;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Created by Paktalin on 18/05/2018.
+ */
+
+class CourseReport {
+    private List<CourseSession> sessions = new ArrayList<>();
+
+    void add(CourseSession session) {
+        sessions.add(session);
+        Collections.sort(sessions);
+    }
+
+    public String text() {
+        StringBuilder buffer = new StringBuilder();
+
+        for (CourseSession session : sessions) {
+            buffer.append(session.getDepartment());
+            buffer.append(" ");
+            buffer.append(session.getNumber());
+            buffer.append(RosterReporter.NEW_LINE);
+        }
+        return buffer.toString();
+    }
+}

app/src/main/java/com/example/paktalin/agilejava/CourseSession.java

 package com.example.paktalin.agilejava;
 
+import android.support.annotation.NonNull;
+
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.GregorianCalendar;
+import java.util.List;
 
 /**
  * Created by Paktalin on 16/05/2018.
  */
 
-class CourseSession {
+class CourseSession implements Comparable<CourseSession>{
     private String department;
     private String number;
-    private ArrayList<Student> students = new ArrayList<>();
+    private List<Student> students = new ArrayList<>();
     private Date startDate;
     private static int count = 0;
     private int numberOfCredits;
@@ -70,7 +73,7 @@ class CourseSession {
         return sessionLength * daysInWeek - daysFromFridayToMonday;
     }
 
-    ArrayList<Student> getAllStudents() {
+    List<Student> getAllStudents() {
         return students;
     }
 
@@ -89,4 +92,12 @@ class CourseSession {
     void setNumberOfCredits(int numberOfCredits) {
         this.numberOfCredits = numberOfCredits;
     }
+
+    @Override
+    public int compareTo(@NonNull CourseSession that) {
+        int compare = this.getDepartment().compareTo(that.getDepartment());
+        if (compare != 0)
+            return compare;
+        return this.getNumber().compareTo(that.getNumber());
+    }
 }

app/src/main/java/com/example/paktalin/agilejava/GradingStrategy.java

+package com.example.paktalin.agilejava;
+
+/**
+ * Created by Paktalin on 18/05/2018.
+ */
+
+interface GradingStrategy {
+    int getGradePointsFor(Student.Grade grade);
+}

app/src/main/java/com/example/paktalin/agilejava/HonorsGradingStrategy.java

+package com.example.paktalin.agilejava;
+
+/**
+ * Created by Paktalin on 18/05/2018.
+ */
+
+class HonorsGradingStrategy implements GradingStrategy {
+    @Override
+    public int getGradePointsFor(Student.Grade grade) {
+        int points = new BasicGradingStrategy().getGradePointsFor(grade);
+        if (points != 0)
+            points++;
+        return points;
+    }
+}

app/src/main/java/com/example/paktalin/agilejava/Student.java

 package com.example.paktalin.agilejava;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Created by Paktalin on 15/05/2018.
  */
@@ -10,6 +13,10 @@ class Student {
     static final int CREDITS_REQUIRED_FOR_FULL_TIME = 12;
     static final String IN_STATE = "CO";
     private String state = "";
+    private List<Grade> grades = new ArrayList<>();
+    private GradingStrategy gradingStrategy = new BasicGradingStrategy();
+
+    enum Grade {A, B, C, D, F};
 
     Student(String name) {
         this.name = name;
@@ -39,4 +46,21 @@ class Student {
     void setState(String state) {
         this.state = state.toUpperCase();
     }
+
+    void addGrade(Grade grade) {
+       grades.add(grade);
+    }
+
+    double getGpa() {
+        if (grades.isEmpty())
+            return 0.0;
+        double total = 0.0;
+        for (Grade grade : grades)
+            total += gradingStrategy.getGradePointsFor(grade);
+        return total/grades.size();
+    }
+
+    void setGradingStrategy(HonorsGradingStrategy gradingStrategy) {
+        this.gradingStrategy = gradingStrategy;
+    }
 }

app/src/test/java/com/example/paktalin/agilejava/AllTests.java

@@ -14,6 +14,7 @@ public class AllTests extends TestSuite {
         suite.addTestSuite(CourseSessionTest.class);
         suite.addTestSuite(RosterReporterTest.class);
         suite.addTestSuite(DateUtilTest.class);
+        suite.addTestSuite(CourseReportTest.class);
         return suite;
     }
 }

app/src/test/java/com/example/paktalin/agilejava/CourseReportTest.java

+package com.example.paktalin.agilejava;
+
+import junit.framework.TestCase;
+
+import java.util.Date;
+
+import static com.example.paktalin.agilejava.RosterReporter.NEW_LINE;
+
+/**
+ * Created by Paktalin on 18/05/2018.
+ */
+
+public class CourseReportTest extends TestCase {
+
+    public void testReport() {
+        final Date date = new Date();
+
+        CourseReport report = new CourseReport();
+        report.add(CourseSession.create("ENGL", "101", date));
+        report.add(CourseSession.create("CZEC", "200", date));
+        report.add(CourseSession.create("ITAL", "410", date));
+        report.add(CourseSession.create("CZEC", "220", date));
+        report.add(CourseSession.create("ITAL", "330", date));
+
+        assertEquals(
+                "CZEC 200" + NEW_LINE +
+                        "CZEC 220" + NEW_LINE +
+                "ENGL 101" + NEW_LINE +
+                "ITAL 330" + NEW_LINE +
+                "ITAL 410" + NEW_LINE,
+            report.text());
+    }
+}

app/src/test/java/com/example/paktalin/agilejava/CourseSessionTest.java

@@ -58,4 +58,19 @@ public class CourseSessionTest extends TestCase {
         session.setNumberOfCredits(CREDITS);
         return session;
     }
+
+    public void testComparable() {
+        Date date = new Date();
+        CourseSession sessionA = CourseSession.create("CMSC", "101", date);
+        CourseSession sessionB = CourseSession.create("ENGL", "101", date);
+        assertTrue(sessionA.compareTo(sessionB) < 0);
+        assertTrue(sessionB.compareTo(sessionA) > 0);
+
+        CourseSession sessionC = CourseSession.create("CMSC", "101", date);
+        assertEquals(0, sessionA.compareTo(sessionC));
+
+        CourseSession sessionD = CourseSession.create("CMSC", "210", date);
+        assertTrue(sessionC.compareTo(sessionD) < 0);
+        assertTrue(sessionD.compareTo(sessionC) > 0);
+    }
 }

app/src/test/java/com/example/paktalin/agilejava/ExampleUnitTest.java

-package com.example.paktalin.agilejava;
-
-import org.junit.Test;
-
-import static org.junit.Assert.*;
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
- */
-public class ExampleUnitTest {
-    @Test
-    public void addition_isCorrect() throws Exception {
-        assertEquals(4, 2 + 2);
-    }
-}
\ No newline at end of file

app/src/test/java/com/example/paktalin/agilejava/LanguageTests.java

@@ -2,6 +2,9 @@ package com.example.paktalin.agilejava;
 
 import junit.framework.TestCase;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Created by Paktalin on 17/05/2018.
  */
@@ -32,4 +35,24 @@ public class LanguageTests extends TestCase {
         assertEquals(6, i);
     }
 
+    public void testCollectionsSort() {
+        List<String> list = new ArrayList<>();
+        list.add("Heller");
+        list.add("Kafka");
+        list.add("Camus");
+        list.add("Boyle");
+
+        java.util.Collections.sort(list);
+        assertEquals("Boyle", list.get(0));
+        assertEquals("Camus", list.get(1));
+        assertEquals("Heller", list.get(2));
+        assertEquals("Kafka", list.get(3));
+    }
+
+    public void testCompareTo() {
+        assertTrue("A".compareTo("B") < 0);
+        assertEquals(0, "A".compareTo("A"));
+        assertTrue("B".compareTo("A") > 0);
+    }
+
 }

app/src/test/java/com/example/paktalin/agilejava/StudentTest.java

@@ -45,4 +45,47 @@ public class StudentTest extends TestCase {
         student.setState("MD");
         assertFalse(student.isInState());
     }
+
+    public void testCalculateGpa() {
+        Student student = new Student("a");
+
+        assertGpa(student, 0.0);
+        student.addGrade(Student.Grade.A);
+        assertGpa(student, 4.0);
+        student.addGrade(Student.Grade.B);
+        assertGpa(student, 3.5);
+        student.addGrade(Student.Grade.C);
+        assertGpa(student, 3.0);
+        student.addGrade(Student.Grade.D);
+        assertGpa(student, 2.5);
+        student.addGrade(Student.Grade.F);
+        assertGpa(student, 2.0);
+    }
+
+    public void testCalculateHonorsStudentGpa() {
+        Student student = createHonorsStudent();
+
+        assertGpa(student, 0.0);
+        student.addGrade(Student.Grade.A);
+        assertGpa(student, 5.0);
+        student.addGrade(Student.Grade.B);
+        assertGpa(student, 4.5);
+        student.addGrade(Student.Grade.C);
+        assertGpa(student, 4.0);
+        student.addGrade(Student.Grade.D);
+        assertGpa(student, 3.5);
+        student.addGrade(Student.Grade.F);
+        assertGpa(student, 2.8);
+    }
+
+    private void assertGpa(Student student, double expectedGpa) {
+        final double GRADE_TOLERANCE = 0.05;
+        assertEquals(expectedGpa, student.getGpa(), GRADE_TOLERANCE);
+    }
+
+    private Student createHonorsStudent() {
+        Student student = new Student("a");
+        student.setGradingStrategy(new HonorsGradingStrategy());
+        return student;
+    }
 }