if (是否海外用戶) {
 return false;
}

if (刷單用戶) {
  return false;
}

if (未付費(fèi)用戶 && 不再服務(wù)時(shí)段) {
  return false
}

if (轉(zhuǎn)介紹用戶 || 付費(fèi)用戶 || 內(nèi)推用戶) {
  return true;
}

// 業(yè)務(wù)數(shù)據(jù)
@Data
public class RuleDto {
  private String address;
 private int age;
}

// 規(guī)則抽象
public interface BaseRule {

    boolean execute(RuleDto dto);
}

// 規(guī)則模板
public abstract class AbstractRule implements BaseRule {

    protected <T> T convert(RuleDto dto) {
        return (T) dto;
    }

    @Override
    public boolean execute(RuleDto dto) {
        return executeRule(convert(dto));
    }
  
    protected <T> boolean executeRule(T t) {
        return true;
    }
}

// 具體規(guī)則- 例子1
public class AddressRule extends AbstractRule {

    @Override
    public boolean execute(RuleDto dto) {
        System.out.println("AddressRule invoke!");
        if (dto.getAddress().startsWith(MATCH_ADDRESS_START)) {
            return true;
        }
        return false;
    }
}

// 具體規(guī)則- 例子2
public class NationalityRule extends AbstractRule {

    @Override
    protected <T> T convert(RuleDto dto) {
        NationalityRuleDto nationalityRuleDto = new NationalityRuleDto();
        if (dto.getAddress().startsWith(MATCH_ADDRESS_START)) {
            nationalityRuleDto.setNationality(MATCH_NATIONALITY_START);
        }
        return (T) nationalityRuleDto;
    }


    @Override
    protected <T> boolean executeRule(T t) {
        System.out.println("NationalityRule invoke!");
        NationalityRuleDto nationalityRuleDto = (NationalityRuleDto) t;
        if (nationalityRuleDto.getNationality().startsWith(MATCH_NATIONALITY_START)) {
            return true;
        }
        return false;
    }
}

// 常量定義
public class RuleConstant {
    public static final String MATCH_ADDRESS_START= "北京";
    public static final String MATCH_NATIONALITY_START= "中國(guó)";
}

public class RuleService {

    private Map<Integer, List<BaseRule>> hashMap = new HashMap<>();
    private static final int AND = 1;
    private static final int OR = 0;

    public static RuleService create() {
        return new RuleService();
    }


    public RuleService and(List<BaseRule> ruleList) {
        hashMap.put(AND, ruleList);
        return this;
    }

    public RuleService or(List<BaseRule> ruleList) {
        hashMap.put(OR, ruleList);
        return this;
    }

    public boolean execute(RuleDto dto) {
        for (Map.Entry<Integer, List<BaseRule>> item : hashMap.entrySet()) {
            List<BaseRule> ruleList = item.getValue();
            switch (item.getKey()) {
                case AND:
                    // 如果是 and 關(guān)系，同步執(zhí)行
                    System.out.println("execute key = " + 1);
                    if (!and(dto, ruleList)) {
                        return false;
                    }
                    break;
                case OR:
                    // 如果是 or 關(guān)系，并行執(zhí)行
                    System.out.println("execute key = " + 0);
                    if (!or(dto, ruleList)) {
                        return false;
                    }
                    break;
                default:
                    break;
            }
        }
        return true;
    }

    private boolean and(RuleDto dto, List<BaseRule> ruleList) {
        for (BaseRule rule : ruleList) {
            boolean execute = rule.execute(dto);
            if (!execute) {
                // and 關(guān)系匹配失敗一次，返回 false
                return false;
            }
        }
        // and 關(guān)系全部匹配成功，返回 true
        return true;
    }

    private boolean or(RuleDto dto, List<BaseRule> ruleList) {
        for (BaseRule rule : ruleList) {
            boolean execute = rule.execute(dto);
            if (execute) {
                // or 關(guān)系匹配到一個(gè)就返回 true
                return true;
            }
        }
        // or 關(guān)系一個(gè)都匹配不到就返回 false
        return false;
    }
}

public class RuleServiceTest {

    @org.junit.Test
    public void execute() {
        //規(guī)則執(zhí)行器
        //優(yōu)點(diǎn)：比較簡(jiǎn)單，每個(gè)規(guī)則可以獨(dú)立，將規(guī)則，數(shù)據(jù)，執(zhí)行器拆分出來，調(diào)用方比較規(guī)整
        //缺點(diǎn)：數(shù)據(jù)依賴公共傳輸對(duì)象 dto

        //1. 定義規(guī)則  init rule
        AgeRule ageRule = new AgeRule();
        NameRule nameRule = new NameRule();
        NationalityRule nationalityRule = new NationalityRule();
        AddressRule addressRule = new AddressRule();
        SubjectRule subjectRule = new SubjectRule();

        //2. 構(gòu)造需要的數(shù)據(jù) create dto
        RuleDto dto = new RuleDto();
        dto.setAge(5);
        dto.setName("張三");
        dto.setAddress("北京");
        dto.setSubject("數(shù)學(xué)");;

        //3. 通過以鏈?zhǔn)秸{(diào)用構(gòu)建和執(zhí)行 rule execute
        boolean ruleResult = RuleService
                .create()
                .and(Arrays.asList(nationalityRule, nameRule, addressRule))
                .or(Arrays.asList(ageRule, subjectRule))
                .execute(dto);
        System.out.println("this student rule execute result :" + ruleResult);
    }
}