Builder模式

Posted 2020-10-12 不停的奋斗

/**抽象Product
 * Created by marcopan on 17/10/23.
 */
public abstract class CarModel {

    private List<String> sequence = new ArrayList<String>();

    protected abstract void start();
    protected abstract void stop();
    protected abstract void alarm();
    protected abstract void engineBoom();

    final public void run() {
        for (int i = 0; i < this.sequence.size(); i ++) {
            if ("start".equalsIgnoreCase(this.sequence.get(i))) {
                this.start();
            } else if ("stop".equalsIgnoreCase(this.sequence.get(i))) {
                this.stop();
            } else if ("alarm".equalsIgnoreCase(this.sequence.get(i))) {
                this.alarm();
            } else if ("engine boom".equalsIgnoreCase(this.sequence.get(i))) {
                this.engineBoom();
            }
        }
    }

    final public void setSequence(List<String> sequence) {
        this.sequence = sequence;
    }

    final public List<String> getSequence() {
        return sequence;
    }
}

/**抽象builder
 * Created by marcopan on 17/10/23.
 */
public interface CarBuilder {
    public abstract void setSequence(List<String> sequence);
    //设置完毕顺序后，就可以直接拿到这个车辆模型了
    public abstract CarModel getCarModel();
}

/**concrete builder
 * Created by marcopan on 17/10/23.
 */
public class BMWBuilder  implements CarBuilder {
    private CarModel bmw = new BMWModel();

    @Override
    public void setSequence(List<String> sequence) {
        this.bmw.setSequence(sequence);
    }

    @Override
    public CarModel getCarModel() {
        return this.bmw;
    }
}

public class BenzBuilder implements CarBuilder {
    private CarModel benz = new BenzModel(); //奔驰车模型

    @Override
    public void setSequence(List<String> sequence) {
        this.benz.setSequence(sequence);
    }

    @Override
    public CarModel getCarModel() {
        return this.benz;
    }
}

public class Director {
    private List<String> sequence = new ArrayList<String>();
    private CarBuilder benzBuilder = new BenzBuilder();
    private CarBuilder bmwBuilder = new BMWBuilder();

    //A顺序的奔驰车
    public CarModel getABenzModel() {
        this.sequence.clear();
        this.sequence.add("start");
        this.sequence.add("stop");
        this.benzBuilder.setSequence(sequence);
        return this.benzBuilder.getCarModel();
    }

    //B顺序的奔驰车
    public CarModel getBBenzModel() {
        this.sequence.clear();
        this.sequence.add("engine boom");
        this.sequence.add("start");
        this.sequence.add("stop");
        this.benzBuilder.setSequence(sequence);
        return this.benzBuilder.getCarModel();
    }

    //C顺序的宝马车
    public CarModel getCBMWModel() {
        this.sequence.clear();
        this.sequence.add("start");
        this.sequence.add("alarm");
        this.sequence.add("stop");
        this.bmwBuilder.setSequence(sequence);
        return this.bmwBuilder.getCarModel();
    }

    //D顺序的宝马车
    public CarModel getDBMWModel() {
        this.sequence.clear();
        this.sequence.add("engine boom");
        this.sequence.add("start");
        this.bmwBuilder.setSequence(sequence);
        return this.bmwBuilder.getCarModel();
    }
}

public class Client {
    public static void main(String[] args) {
        Director director = new Director();

        director.getABenzModel().run();
        director.getBBenzModel().run();
        director.getCBMWModel().run();
    }
}