java - 检查java中的多个 boolean 条件

Question

我有一个场景，我必须检查模板是否已存在于数据库中。如果存在，我必须根据现有模板返回一条消息。

我有几个模板:电子邮件、信件、短信。如果它们全部存在，我必须返回“所有模板都已存在。”

如果仅存在电子邮件模板，我必须返回仅存在电子邮件模板，信函和短信模板也是如此。

代码:

for (EventVO eventVO: eventModuleList) {
    List <EmailTemplateMaster> emailTemplateList = communicationDAO
        .checkEmailTemplateExist(eventVO.getEventCode());
    if (CollectionUtils.isNotEmpty(emailTemplateList)) {
        emailTemplateExist = true;
    }
    List <LetterTemplateMaster> letterTemplateList = communicationDAO
        .checkLetterTemplateExist(eventVO.getEventCode());
    if (CollectionUtils.isNotEmpty(letterTemplateList)) {
        letterTemplateExist = true;
    }
    List <SmsTemplateMaster> smsTemplateList = communicationDAO
        .checkSmsTemplateExist(eventVO.getEventCode());
    if (CollectionUtils.isNotEmpty(smsTemplateList)) {
        smsTemplateExist = true;
    }
    if (emailTemplateExist && letterTemplateExist && smsTemplateExist) {
        templateExist = CommunicationConstants.ALL_TEMPLATE_EXIST;
    }
    if (emailTemplateExist || !letterTemplateExist && !smsTemplateExist) {
        templateExist = CommunicationConstants.EMAIL_TEMPLATE_EXIST;
    }
    if (!emailTemplateExist && letterTemplateExist && !smsTemplateExist) {
        templateExist = CommunicationConstants.LETTER_TEMPLATE_EXIST;
    }
    if (!emailTemplateExist && !letterTemplateExist && smsTemplateExist) {
        templateExist = CommunicationConstants.SMS_TEMPLATE_EXIST;
    }
}

我能知道检查退出模板的 boolean 值是否存在的最简单方法吗？

基于退出，我必须发送相应的消息。

public static final String ALL_TEMPLATE_EXIST = "Email, Letter and Sms Template already exist for the selected event."; 
public static final String EMAIL_TEMPLATE_EXIST = "Email Template already exist for the selected event.";
public static final String SMS_TEMPLATE_EXIST = "Sms Template already exist for the selected event.";
public static final String LETTER_TEMPLATE_EXIST = "Email Letter Template already exist for the selected event.";
public static final String EMAIL_SMS_TEMPLATE_EXIST = "Email and Sms Template already exist for the selected event.";
public static final String EMAIL_LETTER_TEMPLATE_EXIST = "Email and Letter Template already exist for the selected event.";
public static final String SMS_LETTER_TEMPLATE_EXIST = "Sms and Letter Template already exist for the selected event.";

Answer 1

您可以在 CommunicationConstants 类中“准备” boolean 值和消息之间的映射:

public class CommunicationConstants
{
    private static final Map<List<Boolean>, String> CONSTANTS = new HashMap<>();
    static
    {
        CONSTANTS.put(Arrays.asList(true, true, true), "Email, Letter and Sms Template already exist for the selected event.");
        CONSTANTS.put(Arrays.asList(true, true, false), "Email and Sms Template already exist for the selected event.");
        CONSTANTS.put(Arrays.asList(true, false, true), "Email and Letter Template already exist for the selected event.");
        CONSTANTS.put(Arrays.asList(false, true, true), "Sms and Letter Template already exist for the selected event.");
        CONSTANTS.put(Arrays.asList(true, false, false), "Email Template already exist for the selected event.");
        CONSTANTS.put(Arrays.asList(false, true, false), "Sms Template already exist for the selected event.");
        CONSTANTS.put(Arrays.asList(false, false, true), "Letter Template already exist for the selected event.");
    }

    public static String getMessage(boolean emailExists, boolean smsExists, boolean letterExists)
    {
        return CONSTANTS.get(Arrays.asList(emailExists, smsExists, letterExists));
    }
} 

检索它的代码将是一行代码:

System.out.println(CommunicationConstants.getMessage(true, false, true));