Learner Lab Assignment

src/main/java/com/github/curriculeon/Classroom.java

@@ -0,0 +1,17 @@
+package com.github.curriculeon;
+
+public class Classroom {
+    private Students students = Students.getInstance();
+    private Instructors instructors = Instructors.getInstance();
+
+    public void hostLecture(Teacher teacher, Double numberOfHours){
+        teacher.lecture((Learner[])students.toArray(), numberOfHours);
+    }
+
+    public void hostLecture(long id, Double numberOfHours) {
+        Person person = instructors.findById(id);
+        Instructor instructor = (Instructor)person;
+        instructor.lecture((Learner[])students.toArray(), numberOfHours);
+    }
+
+}

src/main/java/com/github/curriculeon/Instructor.java

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+package com.github.curriculeon;
+
+public class Instructor extends Person implements Teacher{
+
+    public Instructor(Long id, String name) {
+        super(id, name);
+    }
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours){
+        learner.learn(numberOfHours);
+    }
+
+    @Override
+    public void lecture(Learner[] learners, Double numberOfHours){
+        Double numberOfHoursPerLearner = numberOfHours / learners.length;
+        for (int i = 0; i < learners.length; i++) {
+            Learner learner = learners[i];
+            learner.learn(numberOfHoursPerLearner);
+
+        }
+    }
+}

src/main/java/com/github/curriculeon/Instructors.java

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+package com.github.curriculeon;
+
+public final class Instructors extends People {
+    private static final Instructors INSTANCE = new Instructors();
+
+    public Instructors() {
+        this.add(new Instructor(0L, "Leon"));
+        this.add(new Instructor(1L, "Haseeb"));
+    }
+
+    public static Instructors getInstance() {
+        return INSTANCE;
+    }
+
+}

src/main/java/com/github/curriculeon/Learner.java

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+package com.github.curriculeon;
+
+public interface Learner {
+    public void learn(Double numberOfHours);
+
+    public Double getTotalStudyTime();
+}

src/main/java/com/github/curriculeon/People.java

@@ -0,0 +1,63 @@
+package com.github.curriculeon;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public class People implements Iterable<Person> {
+    List<Person> personList = new ArrayList<>();
+
+    public void add (Person person) {
+
+        this.personList.add(person);
+    }
+
+    public Person findById(long id) {
+        for(Person person : personList) {
+            if (person.getId() == id) {
+                return person;
+            }
+        }
+        return null;
+    }
+
+    public Boolean contains(Person person) {
+
+        return personList.contains(person);
+    }
+
+    public void remove(Person person) {
+
+        personList.remove(person);
+    }
+
+    public void remove(long id) {
+        for(Person person : personList) {
+            if (person.getId() == id) {
+                personList.remove(person);
+            }
+        }
+    }
+
+    public void removeAll() {
+
+        personList.clear();
+    }
+
+    public int count() {
+
+        return personList.size();
+    }
+
+    public Person[] toArray() {
+        int arrayLength = personList.size();
+        Person[] newArray = new Person[arrayLength];
+        return personList.toArray(newArray);
+    }
+
+    public Iterator<Person> iterator() {
+
+        return personList.iterator();
+    }
+
+}

src/main/java/com/github/curriculeon/Person.java

@@ -1,5 +1,29 @@
 package com.github.curriculeon;
 
 public class Person {
+    private final Long id;
+    private String name;
 
+    public Person() {
+        this.id = null;
+    }
+
+    public Person (Long id, String name) {
+        this.id=id;
+        this.name = name;
+    }
+
+    public Long getId() {
+
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName (String name) {
+
+        this.name = name;
+    }
 }

src/main/java/com/github/curriculeon/Student.java

@@ -0,0 +1,21 @@
+package com.github.curriculeon;
+
+public class Student extends Person implements Learner {
+    private Double totalStudyTime = 2.0;
+
+    public Student(Long id, String name) {
+        super(id, name);
+    }
+
+    @Override
+    public void learn(Double numberOfHours){
+        this.totalStudyTime = totalStudyTime + numberOfHours;
+    }
+
+    @Override
+    public Double getTotalStudyTime() {
+
+        return totalStudyTime;
+    }
+
+}

src/main/java/com/github/curriculeon/Students.java

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+package com.github.curriculeon;
+
+public final class Students extends People {
+    private static final Students INSTANCE = new Students();
+
+    private Students(){
+        super();
+        this.add(new Student(0L, "Student A"));
+        this.add(new Student(1L, "Student B"));
+        this.add(new Student(2L, "Student C"));
+
+    }
+
+    public static Students getInstance(){
+
+        return INSTANCE;
+    }
+
+
+}

src/main/java/com/github/curriculeon/Teacher.java

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+package com.github.curriculeon;
+
+public interface Teacher {
+
+    void teach(Learner learner, Double numberOfHours);
+
+    void lecture(Learner[] learners, Double numberOfHours);
+
+}

src/test/java/com/github/curriculeon/TestInstructor.java

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+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructor {
+    @Test
+    public void testImplementation(){
+        //given
+        Instructor instructor = new Instructor(null, null);
+
+        //when
+        boolean outcome = instructor instanceof Teacher;
+
+        //then
+        Assert.assertTrue(outcome);
+    }
+
+
+    @Test
+    public void testInheritance() {
+        //given
+        Instructor instructor = new Instructor(null, null);
+
+        //when
+        boolean outcome = instructor instanceof Person;
+
+        //then
+        Assert.assertTrue(outcome);
+    }
+
+
+    @Test
+    public void testTeach(){
+        //given
+        Instructor instructor = new Instructor(null, null);
+        Learner learner = new Student(null, null);
+        Double numberOfHoursToTeach = 134.0;
+        Double preStudyTime = learner.getTotalStudyTime();
+        Double expected = preStudyTime + numberOfHoursToTeach;
+
+        //when
+        instructor.teach(learner, numberOfHoursToTeach);
+        Double actual = learner.getTotalStudyTime();
+
+        //then
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testLecture() {
+        //given
+        Teacher teacher = new Instructor(null, null);
+        Student baseStudent = new Student(null, null);
+        Learner[] learners = new Learner[]{
+                new Student(0L, "John"),
+                new Student(1L, "Q"),
+                new Student(2L, "Public")
+        };
+        Double numberOfHours = 128.0;
+        Double expected = numberOfHours/learners.length + baseStudent.getTotalStudyTime();
+
+        //when
+        teacher.lecture(learners, numberOfHours);
+
+        //then
+        for (int i = 0; i < learners.length; i++) {
+            Learner learner = learners[i];
+            Double actual = learner.getTotalStudyTime();
+            Assert.assertEquals(expected, actual);
+
+        }
+    }
+}

src/test/java/com/github/curriculeon/TestInstructors.java

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+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class TestInstructors {
+
+    @Test
+    public void test() {
+        //given
+        Instructors instructors = Instructors.getInstance();
+        List<String> instructorNameList = Arrays.asList("Leon", "Haseeb");
+
+        //when
+        Person[] instructorArray = instructors.toArray();
+        for(int i = 0; i < instructorArray.length; i++) {
+            Person person = instructorArray[i];
+            String personName = person.getName();
+            boolean hasPersonWithName = instructorNameList.contains(personName);
+
+            //then
+            Assert.assertTrue(hasPersonWithName);
+        }
+    }
+}

src/test/java/com/github/curriculeon/TestPeople.java

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+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestPeople {
+
+    @Test
+    public void testAdd() {
+        //given
+    People peopleList = new People();
+    Person person1 = new Person();
+
+        //when
+    peopleList.add(person1);
+
+        //then
+        Assert.assertTrue(peopleList.contains(person1));
+    }
+
+    @Test
+    public void testRemove() {
+        //given
+        People peopleList = new People();
+        Person person1 = new Person();
+        peopleList.add(person1);
+        Boolean expected = peopleList.contains(person1);
+
+        //when
+        peopleList.remove(person1);
+
+        //then
+        Assert.assertFalse(peopleList.contains(person1));
+    }
+
+    @Test
+    public void testFindById() {
+        //given
+        People peopleList = new People();
+        Person person1 = new Person(575L, "Joe");
+        peopleList.add(person1);
+        Boolean expected = peopleList.contains(person1);
+
+        // when
+        peopleList.findById(575L);
+
+        //then
+        Assert.assertTrue(peopleList.contains(peopleList.findById(575L)));
+
+
+    }
+
+
+
+}