对域模型执行验证 [英] Perform validation on domain model
问题描述
我们的业务领域模型具有复杂的验证规则,只有在模型更新后才能执行。
Our business domain model has complex validation rules, which can only be executed when the model has been updated.
这样的事情:
public classs MyDomainModel {
public DomainValidationContext getValidationContext() {
...
}
}
我们不想提取这些,因为:
We don't want to extract these, since:
- 这意味着重复验证规则。
- 列表项某些规则只是软规则,应该会在不停止进一步处理的情况下产生警告消息。
我们考虑重复Validationr中的DomainModel更新值并检查验证错误/警告。
We considered duplicating the DomainModel in the Validationr updating the value and checking for validation errors/warnings.
public class SomeValidator implements Validator {
@Inject
private DomainEditContext domainEditContext;
public void validate(final FacesContext context, final UIComponent component, final Object value) {
MyDomainModel validationModel = domainWorkContext.getDomainModel().clone();
validationModel.setSomeValue(value);
DomainValidationContext dvc = validationModel.getValidationContext();
...
}
}
然而这是公平的容易出错和处理密集,因为每次验证都必须为域模型提供完整的深层副本。
However this is fairly error prone and processing intensive since a full deep copy of the domain model has to be made for every validation.
在模型更新/调用后是否有更好的方法来执行验证-application或渲染响应之前?
Is there any better way to perform validations post model update/invoke-application or prior to render-response?
任何其他想法都非常受欢迎。
Any other ideas are more than welcome.
推荐答案
查看 JsfWarn ,它会在模型更新和调用应用程序后执行验证。
Have a look at JsfWarn it performs validations after model-update and invoke application.
使您能够直接从更新的模型中检索验证上下文。
您的警告验证器将如下所示:
Enabling you to retrieve the validation context straight from the updated model. Your warning validator will look something like this:
public class SomeValidator implements WarningValidator {
@Inject
private DomainEditContext domainEditContext;
public void validate(FacesContext context, UIComponent component, ValidationResult validationResult) {
MyDomainModel myModel = domainEditContext.getMyDomainModel();
DomainValidationContext dvc = myModel.getValidationContext();
if(dvc.isSomeValueInvalid()) {
validationResult.setFacesMessage(....);
}
}
}
与f:validator类似必须向目标组件添加jw:warning。
Similar to f:validator you have to add jw:warning to the targeted component.
<h:inputText id="someValue">
<jw:warning validator="#{someValidator}" />
<f:ajax event="change" render="..." />
</h:inputText>
<h:message for="someValue" />
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