枚举字段的JSR-303 Bean验证 [英] JSR-303 Bean Validation for enum fields

问题描述

我有一个简单的bean，枚举字段

 公共类TestBean {
 @Pattern（regexp =A | B）//不起作用
 private TestEnum testField; 
 // getters + setters 
} 
 
 enum TestEnum {
 A，B，C，D 
} 
  

我想使用Bean Validation验证 testField 。具体来说，我想确保只允许A和B值（对于特定的calidation gropus）。似乎枚举没有处理JSR 303（我试图使用@Pattern验证器）或者我正在以错误的方式做某事。

我得到例外：

  javax.validation.UnexpectedTypeException：找不到类型的验证器：packagename.TestEnum 
  

有没有办法在不编写自定义验证器的情况下验证枚举字段？

解决方案

如果要将约束放在 testField 上，则需要自定义验证器。没有默认值处理枚举。

作为一种解决方法，您可以添加一个getter方法，该方法返回枚举的字符串值

  public class TestBean {
 private TestEnum testField; 
 // getters + setters 
 
 @Pattern（regexp =A | B）//不起作用
 private String getTestFieldName（）{
 return testField。名称（）; 
} 
} 
  

自定义验证器可能是更清晰的解决方案。 / p>

I have a simple bean with enum field

public class TestBean{
   @Pattern(regexp = "A|B") //does not work
   private TestEnum testField;
   //getters + setters
}

enum TestEnum{
  A, B, C, D
}

I would like to validate testField using Bean Validation. Specifically I would like to make sure that only A and B values are allowed (for a particular calidation gropus). It seems that enums are not handled JSR 303 (I was trying to use @Pattern validator) or I am doing something in a wrong way.

I am getting exception:

javax.validation.UnexpectedTypeException: No validator could be found for type: packagename.TestEnum

Is there any way to validate enum fields without writing custom validator?

解决方案

If you want to put the constraint on testField you need a custom validator. None of the default ones handle enums.

As a workaround you could add a getter method which returns the string value of the enum

public class TestBean{
   private TestEnum testField;
   //getters + setters

   @Pattern(regexp = "A|B") //does not work
   private String getTestFieldName() {
       return testField.name();
   }
}

A custom validator is probably the cleaner solution though.

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