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design patterns : state

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haerong22
2021-12-20 23:57:14 +09:00
parent 6e569b43f9
commit 15bcfc4b02
10 changed files with 298 additions and 0 deletions
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23
design-pattern/gof/src/state/after/Client.java Normal file
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package state.after;
public class Client {
public static void main(String[] args) {
OnlineCourse onlineCourse = new OnlineCourse();
Student kim = new Student("kim");
onlineCourse.addStudent(kim);
onlineCourse.addReview("hello", kim);
onlineCourse.changeState(new Private(onlineCourse));
onlineCourse.addReview("hello", kim);
Student lee = new Student("lee");
onlineCourse.addStudent(lee);
lee.addPrivate(onlineCourse);
onlineCourse.addStudent(lee);
System.out.println(onlineCourse);
}
}

24
design-pattern/gof/src/state/after/Draft.java Normal file
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package state.after;
public class Draft implements State {
private OnlineCourse onlineCourse;
public Draft(OnlineCourse onlineCourse) {
this.onlineCourse = onlineCourse;
}
@Override
public void addReview(String review, Student student) {
System.out.println("드래프트 상태에서는 리뷰를 남길 수 없습니다.");
// throw new UnsupportedOperationException("드래프트 상태에서는 리뷰를 남길 수 없습니다.");
}
@Override
public void addStudent(Student student) {
this.onlineCourse.getStudents().add(student);
if (this.onlineCourse.getStudents().size() > 1) {
this.onlineCourse.changeState(new Private(this.onlineCourse));
}
}
}

47
design-pattern/gof/src/state/after/OnlineCourse.java Normal file
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package state.after;
import java.util.ArrayList;
import java.util.List;
public class OnlineCourse {
private State state = new Draft(this);
private List<Student> students = new ArrayList<>();
private List<String> reviews = new ArrayList<>();
public void addStudent(Student student) {
this.state.addStudent(student);
}
public void addReview(String review, Student student) {
this.state.addReview(review, student);
}
public State getState() {
return state;
}
public List<Student> getStudents() {
return students;
}
public List<String> getReviews() {
return reviews;
}
public void changeState(State state) {
this.state = state;
}
@Override
public String toString() {
return "OnlineCourse{" +
"state=" + state +
", students=" + students +
", reviews=" + reviews +
'}';
}
}

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design-pattern/gof/src/state/after/Private.java Normal file
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package state.after;
public class Private implements State {
private OnlineCourse onlineCourse;
public Private(OnlineCourse onlineCourse) {
this.onlineCourse = onlineCourse;
}
@Override
public void addReview(String review, Student student) {
if (this.onlineCourse.getStudents().contains(student)) {
this.onlineCourse.getReviews().add(review);
} else {
System.out.println("프라이빗 코스를 수강하는 학생만 리뷰를 남길 수 있습니다.");
// throw new UnsupportedOperationException("프라이빗 코스를 수강하는 학생만 리뷰를 남길 수 있습니다.");
}
}
@Override
public void addStudent(Student student) {
if (student.isAvailable(this.onlineCourse)) {
this.onlineCourse.getStudents().add(student);
} else {
System.out.println("프라이빗 코스를 수강할 수 없습니다.");
// throw new UnsupportedOperationException("프라이빗 코스를 수강할 수 없습니다.");
}
}
}

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design-pattern/gof/src/state/after/Published.java Normal file
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package state.after;
public class Published implements State {
private OnlineCourse onlineCourse;
public Published(OnlineCourse onlineCourse) {
this.onlineCourse = onlineCourse;
}
@Override
public void addReview(String review, Student student) {
this.onlineCourse.getReviews().add(review);
}
@Override
public void addStudent(Student student) {
this.onlineCourse.getStudents().add(student);
}
}

8
design-pattern/gof/src/state/after/State.java Normal file
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package state.after;
public interface State {
void addReview(String review, Student student);
void addStudent(Student student);
}

30
design-pattern/gof/src/state/after/Student.java Normal file
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package state.after;
import java.util.HashSet;
import java.util.Set;
public class Student {
private String name;
public Student(String name) {
this.name = name;
}
private Set<OnlineCourse> onlineCourses = new HashSet<>();
public boolean isAvailable(OnlineCourse onlineCourse) {
return this.onlineCourses.contains(onlineCourse);
}
public void addPrivate(OnlineCourse onlineCourse) {
this.onlineCourses.add(onlineCourse);
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
'}';
}
}

23
design-pattern/gof/src/state/before/Client.java Normal file
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package state.before;
public class Client {
public static void main(String[] args) {
Student student = new Student("whiteship");
OnlineCourse onlineCourse = new OnlineCourse();
Student keesun = new Student("keesun");
keesun.addPrivateCourse(onlineCourse);
onlineCourse.addStudent(student);
onlineCourse.changeState(OnlineCourse.State.PRIVATE);
onlineCourse.addStudent(keesun);
onlineCourse.addReview("hello", student);
System.out.println(onlineCourse.getState());
System.out.println(onlineCourse.getStudents());
System.out.println(onlineCourse.getReviews());
}
}

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design-pattern/gof/src/state/before/OnlineCourse.java Normal file
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package state.before;
import java.util.ArrayList;
import java.util.List;
public class OnlineCourse {
public enum State {
DRAFT, PUBLISHED, PRIVATE
}
private State state = State.DRAFT;
private List<String> reviews = new ArrayList<>();
private List<Student> students = new ArrayList<>();
public void addReview(String review, Student student) {
if (this.state == State.PUBLISHED) {
this.reviews.add(review);
} else if (this.state == State.PRIVATE && this.students.contains(student)) {
this.reviews.add(review);
} else {
throw new UnsupportedOperationException("리뷰를 작성할 수 없습니다.");
}
}
public void addStudent(Student student) {
if (this.state == State.DRAFT || this.state == State.PUBLISHED) {
this.students.add(student);
} else if (this.state == State.PRIVATE && availableTo(student)) {
this.students.add(student);
} else {
throw new UnsupportedOperationException("학생을 해당 수업에 추가할 수 없습니다.");
}
if (this.students.size() > 1) {
this.state = State.PRIVATE;
}
}
public void changeState(State newState) {
this.state = newState;
}
public State getState() {
return state;
}
public List<String> getReviews() {
return reviews;
}
public List<Student> getStudents() {
return students;
}
private boolean availableTo(Student student) {
return student.isEnabledForPrivateClass(this);
}
}

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design-pattern/gof/src/state/before/Student.java Normal file
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package state.before;
import java.util.ArrayList;
import java.util.List;
public class Student {
private String name;
public Student(String name) {
this.name = name;
}
private List<OnlineCourse> privateCourses = new ArrayList<>();
public boolean isEnabledForPrivateClass(OnlineCourse onlineCourse) {
return privateCourses.contains(onlineCourse);
}
public void addPrivateCourse(OnlineCourse onlineCourse) {
this.privateCourses.add(onlineCourse);
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
'}';
}
}