org.zrgs.spring.statemachine.cdplayer.CdPlayer.java Source code

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Here is the source code for org.zrgs.spring.statemachine.cdplayer.CdPlayer.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.zrgs.spring.statemachine.cdplayer;

import org.springframework.messaging.support.MessageBuilder;
import org.springframework.statemachine.ExtendedState;
import org.springframework.statemachine.StateMachine;
import org.springframework.statemachine.annotation.OnTransition;
import org.springframework.statemachine.annotation.WithStateMachine;

import javax.inject.Inject;
import java.text.SimpleDateFormat;
import java.util.Date;

@WithStateMachine
public class CdPlayer {

    @Inject
    private StateMachine<Application.States, Application.Events> stateMachine;

    private String cdStatus = "No CD";
    private String trackStatus = "";

    public void load(Cd cd) {
        stateMachine.sendEvent(MessageBuilder.withPayload(Application.Events.LOAD)
                .setHeader(Application.Variables.CD.toString(), cd).build());
    }

    public void play() {
        stateMachine.sendEvent(Application.Events.PLAY);
    }

    public void stop() {
        stateMachine.sendEvent(Application.Events.STOP);
    }

    public void pause() {
        stateMachine.sendEvent(Application.Events.PAUSE);
    }

    public void eject() {
        stateMachine.sendEvent(Application.Events.EJECT);
    }

    public void forward() {
        stateMachine.sendEvent(MessageBuilder.withPayload(Application.Events.FORWARD)
                .setHeader(Application.Headers.TRACKSHIFT.toString(), 1).build());
    }

    public void back() {
        stateMachine.sendEvent(MessageBuilder.withPayload(Application.Events.BACK)
                .setHeader(Application.Headers.TRACKSHIFT.toString(), -1).build());
    }

    public String getLdcStatus() {
        return cdStatus + " " + trackStatus;
    }

    //tag::snippetA[]
    @OnTransition(target = "BUSY")
    public void busy(ExtendedState extendedState) {
        Object cd = extendedState.getVariables().get(Application.Variables.CD);
        if (cd != null) {
            cdStatus = ((Cd) cd).getName();
        }
    }
    //end::snippetA[]

    @Application.StatesOnTransition(target = Application.States.PLAYING)
    public void playing(ExtendedState extendedState) {
        Object elapsed = extendedState.getVariables().get(Application.Variables.ELAPSEDTIME);
        Object cd = extendedState.getVariables().get(Application.Variables.CD);
        Object track = extendedState.getVariables().get(Application.Variables.TRACK);
        if (elapsed instanceof Long && track instanceof Integer && cd instanceof Cd) {
            SimpleDateFormat format = new SimpleDateFormat("mm:ss");
            trackStatus = ((Cd) cd).getTracks()[((Integer) track)] + " " + format.format(new Date((Long) elapsed));
        }
    }

    @Application.StatesOnTransition(target = Application.States.OPEN)
    public void open(ExtendedState extendedState) {
        cdStatus = "Open";
    }

    //tag::snippetB[]
    @Application.StatesOnTransition(target = { Application.States.CLOSED, Application.States.IDLE })
    public void closed(ExtendedState extendedState) {
        Object cd = extendedState.getVariables().get(Application.Variables.CD);
        if (cd != null) {
            cdStatus = ((Cd) cd).getName();
        } else {
            cdStatus = "No CD";
        }
        trackStatus = "";
    }
    //end::snippetB[]
}