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状态模式

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F嘉阳
2020-07-22 16:29:21 +08:00
parent 52b24d0111
commit dd1da27b7c
13 changed files with 256 additions and 0 deletions
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49
src/main/java/top/fjy8018/designpattern/pattern/behavior/state/CourseVideoContext.java Normal file
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package top.fjy8018.designpattern.pattern.behavior.state;
/**
* 视频上下文
*
* @author F嘉阳
* @date 2020/7/22 15:20
*/
public class CourseVideoContext {
/**
* 存储当前状态
*/
private CourseVideoState courseVideoState;
/**
* 结合享元模式设置为内存共享
*/
public final static PlayState PLAY_STATE = new PlayState();
public final static StopState STOP_STATE = new StopState();
public final static PauseState PAUSE_STATE = new PauseState();
public final static SpeedState SPEED_STATE = new SpeedState();
public CourseVideoState getCourseVideoState() {
return courseVideoState;
}
public void setCourseVideoState(CourseVideoState courseVideoState) {
this.courseVideoState = courseVideoState;
// 把自己本身设置到实例上下文中
this.courseVideoState.setCourseVideoContext(this);
}
public void play() {
this.courseVideoState.play();
}
public void speed() {
this.courseVideoState.speed();
}
public void stop() {
this.courseVideoState.stop();
}
public void pause() {
this.courseVideoState.pause();
}
}

32
src/main/java/top/fjy8018/designpattern/pattern/behavior/state/CourseVideoState.java Normal file
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package top.fjy8018.designpattern.pattern.behavior.state;
import javax.faces.lifecycle.Lifecycle;
/**
* 视频播放状态转换场景
* <p>
* {@link Lifecycle#execute(javax.faces.context.FacesContext)} 该方法通过外部状态控制改变行为
* {@link javax.faces.webapp.FacesServlet} 状态控制
*
* @author F嘉阳
* @date 2020/7/22 15:20
*/
public abstract class CourseVideoState {
/**
* 视频上下文
*/
protected CourseVideoContext courseVideoContext;
public void setCourseVideoContext(CourseVideoContext courseVideoContext) {
this.courseVideoContext = courseVideoContext;
}
public abstract void play();
public abstract void speed();
public abstract void pause();
public abstract void stop();
}

28
src/main/java/top/fjy8018/designpattern/pattern/behavior/state/PauseState.java Normal file
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package top.fjy8018.designpattern.pattern.behavior.state;
/**
* @author F嘉阳
* @date 2020/7/22 15:20
*/
public class PauseState extends CourseVideoState {
@Override
public void play() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.PLAY_STATE);
}
@Override
public void speed() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.SPEED_STATE);
}
@Override
public void pause() {
System.out.println("暂停播放课程视频状态");
}
@Override
public void stop() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.STOP_STATE);
}
}

28
src/main/java/top/fjy8018/designpattern/pattern/behavior/state/PlayState.java Normal file
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package top.fjy8018.designpattern.pattern.behavior.state;
/**
* @author F嘉阳
* @date 2020/7/22 15:20
*/
public class PlayState extends CourseVideoState {
@Override
public void play() {
System.out.println("正常播放课程视频状态");
}
@Override
public void speed() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.SPEED_STATE);
}
@Override
public void pause() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.PAUSE_STATE);
}
@Override
public void stop() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.STOP_STATE);
}
}

27
src/main/java/top/fjy8018/designpattern/pattern/behavior/state/SpeedState.java Normal file
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package top.fjy8018.designpattern.pattern.behavior.state;
/**
* @author F嘉阳
* @date 2020/7/22 15:20
*/
public class SpeedState extends CourseVideoState {
@Override
public void play() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.PLAY_STATE);
}
@Override
public void speed() {
System.out.println("快进播放课程视频状态");
}
@Override
public void pause() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.PAUSE_STATE);
}
@Override
public void stop() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.STOP_STATE);
}
}

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src/main/java/top/fjy8018/designpattern/pattern/behavior/state/StopState.java Normal file
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package top.fjy8018.designpattern.pattern.behavior.state;
/**
* @author F嘉阳
* @date 2020/7/22 15:20
*/
public class StopState extends CourseVideoState {
@Override
public void play() {
super.courseVideoContext.setCourseVideoState(CourseVideoContext.PLAY_STATE);
}
@Override
public void speed() {
System.out.println("ERROR 停止状态不能快进!!");
}
@Override
public void pause() {
System.out.println("ERROR 停止状态不能暂停!!");
}
@Override
public void stop() {
System.out.println("停止播放课程视频状态");
}
}

31
src/test/java/top/fjy8018/designpattern/pattern/behavior/state/PlayStateTest.java Normal file
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package top.fjy8018.designpattern.pattern.behavior.state;
import org.junit.jupiter.api.Test;
/**
* @author F嘉阳
* @date 2020/7/22 16:19
*/
class PlayStateTest {
@Test
void play() {
CourseVideoContext courseVideoContext = new CourseVideoContext();
courseVideoContext.setCourseVideoState(new PlayState());
System.out.println("当前状态:" + courseVideoContext.getCourseVideoState().getClass().getSimpleName());
courseVideoContext.pause();
System.out.println("当前状态:" + courseVideoContext.getCourseVideoState().getClass().getSimpleName());
courseVideoContext.speed();
System.out.println("当前状态:" + courseVideoContext.getCourseVideoState().getClass().getSimpleName());
courseVideoContext.stop();
System.out.println("当前状态:" + courseVideoContext.getCourseVideoState().getClass().getSimpleName());
courseVideoContext.speed();
}
}