比较Java中的状态

Question

在我的项目中，我们必须创建一个系统来创建一个对象Facility，我们必须对其进行检查和维护，以检查它是否正常工作。我们创建了一个Facility对象，然后我们创建了一个状态机，可以将Facility的状态更改为休息，工作，维护或工作。

这是SuperFacility类：

import java.util.Map;

public interface SuperFacility {
    public void setName(String name);
    public void setAddress(String address);
    public void setDescription(String description);
    public void setRefNumber(int refNumber);
    public void setCapacity(int capacity);
    public void setCost(double cost);
    public void setProblemRate(int problemRate);
    public String getName();
    public String getAddress();
    public String getDescription();
    public int getRefNumber();
    public int getCapacity();
    public double getCost();
    public int getProblemRate();
    public void oxygenator(boolean oxygenator);
    public void nuclearReactor(boolean nuclearReactor);
    public void innerAirlocks(boolean innerAirlocks);
    public void externalAirlocks(boolean externalAirlocks);
    public void comms(boolean comms);
    public void waterMaking(boolean waterMaking);
    public void startMachines();
    public Map getMap();
    public void getFacilityStatus();
    public void getFacilityStatus(Map<String, Boolean> map);
} 

这是Facility类：

import java.util.*;

public class Facility extends StateMachine implements SuperFacility {

    public String name, address, description;
    public int refNumber, capacity, problemRate;
    private double cost;
    private Map<String, Boolean> map = new HashMap<String, Boolean>();
    private boolean[] machines = new boolean[6];
    private boolean oxygenator, innerAirlocks, externalAirlocks,
            comms, nuclearReactor, waterMaking;
    private final int numberOfMachines = 6; // Number of Machines inside Facility

    // Setters
    public void setName(String name){
        this.name = name;
    }

    public void setAddress(String address){
        this.address = address;
    }

    public void setDescription(String description){
        this.description = description;
    }

    public void setRefNumber(int refNumber){
        this.refNumber = refNumber;
    }

    public void setCapacity(int capacity){
        this.capacity = capacity;
    }

    public void setCost(double cost){
        this.cost = cost;
    }

    public void setProblemRate(int problemRate){
        this.problemRate = problemRate;
    }

    // Getters
    public String getName(){
        return name;
    }

    public String getAddress(){
        return address;
    }

    public String getDescription(){
        return description;
    }

    public int getRefNumber(){
        return refNumber;
    }

    public int getCapacity(){
        return capacity;
    }

    public double getCost(){
        return cost;
    }

    public int getProblemRate(){
        return problemRate;
    }

    public void oxygenator(boolean oxygenator){
        this.oxygenator = oxygenator;
    }

    public void nuclearReactor(boolean nuclearReactor){
        this.nuclearReactor = nuclearReactor;
    }

    public void innerAirlocks(boolean innerAirlocks){
        this.innerAirlocks = innerAirlocks;
    }

    public void externalAirlocks(boolean externalAirlocks){
        this.externalAirlocks = externalAirlocks;
    }

    public void comms(boolean comms){
        this.comms = comms;
    }

    public void waterMaking(boolean waterMaking){
        this.waterMaking = waterMaking;
    }

    public boolean[] getMachines(){
        machines[0] = oxygenator;
        machines[1] = nuclearReactor;
        machines[2] = innerAirlocks;
        machines[3] = externalAirlocks;
        machines[4] = comms;
        machines[5] = waterMaking;
        return machines;
    }

    // Set machines to false
    public void breakMachines(){
        oxygenator(false);
        nuclearReactor(false);
        innerAirlocks(false);
        externalAirlocks(false);
        comms(false);
        waterMaking(false);

        map.clear();
        initializeMap(map);
    }

    public void startMachines(){
        // Set all of the booleans from this Facility to true;
        // This booleans are what we call "the machines from the Facility"
        oxygenator(true);
        nuclearReactor(true);
        innerAirlocks(true);
        externalAirlocks(true);
        comms(true);
        waterMaking(true);

        map.clear();
        initializeMap(map);
    }

    public void initializeMap(Map<String, Boolean> map){
        this.map.put("Oxygenator", oxygenator);
        this.map.put("Inner Airlocks", innerAirlocks);
        this.map.put("External Airlocks", externalAirlocks);
        this.map.put("Nuclear Reactor", nuclearReactor);
        this.map.put("Comms", comms);
        this.map.put("WaterMaking", waterMaking);
    }

    public Map<String, Boolean> getMap(){
        return map;
    }

    public void getFacilityStatus(){ // The status of the map in this object
        for (Map.Entry<String, Boolean> i: map.entrySet()){
            System.out.println(i.getKey() + ": " + i.getValue());
        }
    }

    public void getFacilityStatus(Map<String, Boolean> map){ // The status of any Facility map
        for (Map.Entry<String, Boolean> i: map.entrySet()){
            System.out.println(i.getKey() + ": " + i.getValue());
        }
    }
} 

这是StateMachine类：

 public class StateMachine {

    public State state = State.RESTING;

    enum State {
        WORKING, RESTING, MAINTENANCE, BROKEN
    }

    public State getFacilityState(){
        return state;
    }

    public void setStateWorking(Facility fac){
        fac.state = State.WORKING;
    }

    public void setStateResting(Facility fac){
        fac.state = State.RESTING;
    }

    public void setStateMaintenance(Facility fac){
        fac.state = State.MAINTENANCE;
    }

    public void setStateBroken(Facility fac) { fac.state = State.BROKEN;}

    public State getState(){
        return state;
    }
}

在我的Inspection类中，我有两个方法必须检查Facility的状态以查看它是否正常工作，但是我的if语句出现问题：

 import java.util.*;

public class Inspection {

    private Facility fac;

    public boolean isBroken(){

        if (fac.state == State.BROKEN)
            return true;
        else
            return false;
    }

    public void makeMaintenanceRequest(Control c){

        if (fac.state == State.BROKEN){
            c.scheduleMaintenance(fac);
        }
    } 

我希望这些方法能够将Facility的当前状态与Broken状态进行比较。我应该如何比较各州？我一直收到State.BROKEN的“找不到符号”错误

Answer 1

虽然我不能很好地理解你想要做什么，但我可以告诉你，Inspection课程可能已经按你的意愿运作了。

我看到你注释掉了构造函数，为什么？可以在Facility中注入一个Inspection实例。但是，你应该接受StateMachine。

public class Inspection {
   private final StateMachine stateMachine;

   public Inspection(final StateMachine stateMachine) {
      this.stateMachine = stateMachine;
   }

   ...
}

然后，在你的Inspection#isBroken方法里面

public boolean isBroken() {
   return this.stateMachine.getFacilityState() == State.BROKEN; // "this" not necessary
}

由于Facility延伸StateMachine，它暴露了getFacilityState()方法。 因为Facility延伸StateMachine，Inspection能够接受它。

final Facility facility = new Facility(...);
final Inspection inspection = new Inspection(facility);
final boolean isBroken = inspection.isBroken();

Answer 2

一个简单的解决方案是用StateMachine.State.BROKEN替换State.BROKEN

public boolean isBroken（）{

    if (fac.state == StateMachine.State.BROKEN)
        return true;
    else
        return false;
}