如何在运行时更改注释/Hibernate 验证规则？

发布于 2024-07-17 06:41:22 字数 366 浏览 12 评论 0原文

如果有一个带有某些字段的 Java 类，我想使用 Hibernate Validator 进行验证。现在我希望我的用户能够在运行时配置进行哪些验证。

例如：

public class MyPojo {
    ...

    @NotEmpty
    String void getMyField() {
        ... 
    }

    ...
}

假设我想删除 NotEmpty 检查或将其替换为 Email 或 CreditCardNumber，我该怎么做？有可能吗？我想这归结为在运行时更改注释......

原文

If have a Java class with some fields I want to validate using Hibernate Validator.
Now I want my users to be able to configure at runtime which validations take place.

For example:

public class MyPojo {
    ...

    @NotEmpty
    String void getMyField() {
        ... 
    }

    ...
}

Let's say I want to remove the NotEmpty check or replace it with Email or CreditCardNumber, how can I do it? Is it even possible? I guess it comes down to changing annotations at runtime...

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栀梦 2024-07-24 06:41:22

正常情况下你是做不到的。

以下是我通过 Hibernate Validator 获得更多动态验证所做的工作。

扩展ClassValidator 类。
重写 getInvalidVaues(Object myObj) 方法。首先，调用 super.getInvalidValues(myObj)，然后将挂钩添加到您的自定义验证中。
实例化您的自定义验证器并调用 getInvalidValues 进行验证。任何休眠注释验证都将在此时启动，并且您的自定义动态验证（注释不支持的任何内容）也将启动。

示例：

public class MyObjectValidator extends ClassValidator<MyObject>
{
    public MyObjectValidator()
    {
         super(MyObject.class);
    }

    public InvalidValue[] getInvalidValues(MyObject myObj)
    {
        List<InvalidValue> invalids = new ArrayList<InvalidValue>();
        invalids.addAll(Arrays.asList(super.getInvalidValues(myObj)));

        // add custom validations here
        invalids.addAll(validateDynamicStuff(myObj));

        InvalidValue[] results = new InvalidValue[invalids.size()];
        return invalids.toArray(results);
    }

    private List<InvalidValue> validateDynamicStuff(MyObject myObj)
    {
        // ... whatever validations you want ...
    }

}

因此，您的自定义验证代码可以包含诸如“如果用户配置了此验证，则执行此验证，否则执行此验证”等逻辑。您可能能够也可能无法利用支持休眠验证的相同代码，但是要么方式，您正在做的事情比休眠验证器的“正常”用例更加复杂。

You can't do it normally.

Here's what I've done to get more dynamic validations working via Hibernate Validator.

Extend the ClassValidator class.
Override the getInvalidVaues(Object myObj) method. First, call super.getInvalidValues(myObj), then add the hook to your customized validation.
Instantiate your custom validator and call getInvalidValues to validate. Any hibernate annotated validations will kick off at this point, and your custom dynamic validations (anything not supported by annotations) will kick off as well.

Example:

public class MyObjectValidator extends ClassValidator<MyObject>
{
    public MyObjectValidator()
    {
         super(MyObject.class);
    }

    public InvalidValue[] getInvalidValues(MyObject myObj)
    {
        List<InvalidValue> invalids = new ArrayList<InvalidValue>();
        invalids.addAll(Arrays.asList(super.getInvalidValues(myObj)));

        // add custom validations here
        invalids.addAll(validateDynamicStuff(myObj));

        InvalidValue[] results = new InvalidValue[invalids.size()];
        return invalids.toArray(results);
    }

    private List<InvalidValue> validateDynamicStuff(MyObject myObj)
    {
        // ... whatever validations you want ...
    }

}

So your custom validation code can contain logic like "Do this validation, if the user configured it, otherwise do that one", etc. You may or may not be able to leverage the same code that powers the hibernate validations, but either way, what you are doing is more involved that the 'normal' use case for hibernate validator.

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