徒手撸设计模式解释器模式

概念

解释器模式（Interpreter Pattern）提供了评估语言的语法或表达式的方式，它属于行为型模式。这种模式实现了一个表达式接口，该接口解释一个特定的上下文。这种模式被用在 SQL 解析、符号处理引擎等。

参考链接: https://www.runoob.com/design-pattern/interpreter-pattern.html

代码案例

新增表达式接口

/**
 * 表达式接口
 */
public interface Expression {
    boolean interpreter(String type);
}

表达式实现类

生产表达式

/**
 * 生产表达式
 */
public class ProductionExpression implements Expression {
    private String data;

    public ProductionExpression(String data) {
        this.data = data;
    }

    @Override
    public boolean interpreter(String type) {
        if (type.contains(data)){
            return true;
        }
        return false;
    }
}

自行车或红色表达式

/**
 * 自行车或红色表达式
 */
public class BicycleOrRedExpression implements Expression {
    Expression expression1= null;
    Expression expression2= null;

    public BicycleOrRedExpression(Expression expression1, Expression expression2) {
        this.expression1 = expression1;
        this.expression2 = expression2;
    }

    @Override
    public boolean interpreter(String type) {
        return expression1.interpreter(StFlag.BICYCLE.toLowerCase()) || expression2.interpreter(StFlag.RED.toLowerCase()) ;
    }
}

蓝色汽车表达式

/**
 * 蓝色汽车表达式
 */
public class CarAndBlueExpression implements Expression {
    Expression expression1= null;
    Expression expression2= null;

    public CarAndBlueExpression(Expression expression1, Expression expression2) {
        this.expression1 = expression1;
        this.expression2 = expression2;
    }

    @Override
    public boolean interpreter(String type) {
        return expression1.interpreter(StFlag.CAR.toLowerCase()) && expression2.interpreter(StFlag.BLUE.toLowerCase()) ;
    }
}

表达式实体类

@Setter
@Getter
public class InterpreterEntity {
    private String type;
    private String colour;
}

测试主类

/**
 * 设计模式控制器
 */
@RestController
@RequestMapping("/designPattern")
@Slf4j
public class DesignController {

    @PostMapping("/interpreter")
    public ResponseModel interpreter(@RequestBody List<InterpreterEntity> interpreterEntityList) {
        log.info("interpreter   ---- start ");
        List list= new ArrayList();
        for (InterpreterEntity interpreterEntity : interpreterEntityList) {
            String type = interpreterEntity.getType();
            ProductionExpression typeExpression = new ProductionExpression(type);
            String colour = interpreterEntity.getColour();
            ProductionExpression colourExpression = new ProductionExpression(colour);
            BicycleOrRedExpression bicycleOrRedExpression = new BicycleOrRedExpression(typeExpression, colourExpression);
            boolean interpreter = bicycleOrRedExpression.interpreter(type+colour);
            list.add(type+" or "+colour+"===bicycleOrRed==="+"---------"+interpreter);
            CarAndBlueExpression carAndBlueExpression = new CarAndBlueExpression(typeExpression, colourExpression);
            boolean interpreter1 = carAndBlueExpression.interpreter(type+colour);
            list.add(type+" And "+colour+"===carAndBlue==="+"---------"+interpreter1);
        }

        log.info("interpreter   ---- end ");
        return new ResponseModel("解释器模式完成", 200, list);
    }
}

测试案例

2022-06-29 01:12:59.273 INFO  interpreter   ---- start  【http-nio-8081-exec-4】【DesignController:74】
2022-06-29 01:12:59.273 INFO  bicycle Or 白色===bicycleOrRed===---------true 【http-nio-8081-exec-4】【DesignController:84】
2022-06-29 01:12:59.274 INFO  bicycle And 白色===carAndBlue===---------false 【http-nio-8081-exec-4】【DesignController:88】
2022-06-29 01:12:59.274 INFO  car Or blue===bicycleOrRed===---------false 【http-nio-8081-exec-4】【DesignController:84】
2022-06-29 01:12:59.274 INFO  car And blue===carAndBlue===---------true 【http-nio-8081-exec-4】【DesignController:88】
2022-06-29 01:12:59.274 INFO  interpreter   ---- end  【http-nio-8081-exec-4】【DesignController:91】