状态模式

.idea/.gitignore

@@ -0,0 +1,2 @@
+# Default ignored files
+/workspace.xml

.idea/Design-pattern.iml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />

.idea/encodings.xml

@@ -2,5 +2,6 @@
 <project version="4">
   <component name="Encoding">
     <file url="file://$PROJECT_DIR$" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
   </component>
 </project>

.idea/jarRepositories.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>

.idea/misc.xml

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
   <component name="MavenProjectsManager">
     <option name="originalFiles">
       <list>

pom.xml

@@ -134,6 +134,12 @@
             <artifactId>commons-pool2</artifactId>
             <version>2.4.2</version>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/com.sun.faces/jsf-api -->
+        <dependency>
+            <groupId>com.sun.faces</groupId>
+            <artifactId>jsf-api</artifactId>
+            <version>2.2.20</version>
+        </dependency>
 
         <dependency>
             <groupId>mysql</groupId>

src/main/java/top/fjy8018/designpattern/pattern/behavior/state/CourseVideoContext.java

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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();
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/state/CourseVideoState.java

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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();
+
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/state/PauseState.java

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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);
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/state/PlayState.java

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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);
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/state/SpeedState.java

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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);
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/state/StopState.java

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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");
+    }
+}

src/test/java/top/fjy8018/designpattern/pattern/behavior/state/PlayStateTest.java

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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();
+    }
+}