learn_java-design-patterns/CommandPattern/BasicRemote/CeilingFanOn.java at main · ForeverAProgrammer/learn_java-design-patterns · GitHub

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package CommandPattern.BasicRemote;

public class CeilingFanOn implements Command{
    CeilingFan ceilingFan;
    int prevSpeed;

    public CeilingFanOn(CeilingFan ceilingFan) {
        this.ceilingFan = ceilingFan;
    }

    public void execute() {
        prevSpeed = ceilingFan.getSpeed();
        ceilingFan.high();
    }

    public void undo() {
         if(prevSpeed == CeilingFan.HIGH){
            ceilingFan.high();
        } else if (prevSpeed == CeilingFan.MEDIUM){
            ceilingFan.medium();
        } else if (prevSpeed == CeilingFan.LOW){
            ceilingFan.low();
        } else if (prevSpeed == CeilingFan.OFF){
            ceilingFan.off();
        }
    }

    public String toString() {
        return "CeilingFanOn";
    }
}