设计模式之建造者模式-案例代码

1、类图

 

 

 2、代码实例

public abstract class ConditionBuilder {

    public abstract void buildOrderId();

    public abstract void buildOrderType();

    public abstract SearchCondition getResult();
}

public class SearchCondition {

    private String orderId;

    private Integer orderType;

    public String getOrderId() {
        return orderId;
    }

    public void setOrderId(String orderId) {
        this.orderId = orderId;
    }

    public Integer getOrderType() {
        return orderType;
    }

    public void setOrderType(Integer orderType) {
        this.orderType = orderType;
    }

    public String showSearchCondition(){
        return "SearchCondition{" +
                "orderId='" + orderId + '\'' +
                ", orderType=" + orderType +
                '}';
    }
}

public class SearchConditionBuilder extends ConditionBuilder{

    private SearchCondition searchCondition = new SearchCondition();

    private Map<String,Object> reqParams;

    public SearchConditionBuilder(Map<String, Object> reqParams) {
        if(reqParams!=null){
            this.reqParams = reqParams;
        }else{
            this.reqParams= new HashMap<>();
        }

    }

    @Override
    public void buildOrderId() {
        searchCondition.setOrderId(reqParams.get("orderId")!=null?(String)reqParams.get("orderId"):null);
    }

    @Override
    public void buildOrderType() {
        searchCondition.setOrderType(reqParams.get("orderType")!=null?(Integer) reqParams.get("orderType"):null);
    }

    @Override
    public SearchCondition getResult() {
        return searchCondition;
    }
}

public class ConditionDirector {

    public void constructCondition(ConditionBuilder conditionBuilder){
        conditionBuilder.buildOrderId();
        conditionBuilder.buildOrderType();
    }
}


测试代码main()：

public class TestBuilder {

    public static void main(String[] args) {
        ConditionDirector conditionDirector = new ConditionDirector();

        Map<String,Object> reqParams= new HashMap<>();
        reqParams.put("orderId","123456");
        reqParams.put("orderType",0);

        SearchConditionBuilder searchConditionBuilder = new SearchConditionBuilder(reqParams);
        conditionDirector.constructCondition(searchConditionBuilder);

        SearchCondition result = searchConditionBuilder.getResult();
        System.out.println(result.showSearchCondition());

    }
}