Best validation method for a dynamic class in java (Micronaut)-CodePudding

I have a class A (listed below) which can have many different types of attributes saved to it. Naturally these attributes can be of different types. Based on the type of attribute I want to apply some validations to it.

What would be the best way of doing it in Micronaut?

Here is an example of what I want to achieve:

public class A {
    
    private String type;
    private String value;

    // getter/setter omitted…
}

Some example instances of class A:

{type: "type1", value: "examplevalue1"}

{type: "type2", value: "examplevalue2"}

{type: "type2", value: "examplevalue3"}

Then I have some set of validation rules which are relevant to the respective types. Each type (type1, type2, type3) have separate set of validation rules. These rules are not just restricted to String validation but also semantic and business validation.

CodePudding user response：

I would solve this using specific class per type. You can introduce an interface A

interface A {
   String getType();
}

and then implement the concrete types.

public class Type1 implements A {

    @NotBlank
    private String value;

    @Override
    public String getValue() { return this.value; }

    public void setValue(String v) { this.value = v; }
}

public class Type2 implements A {

    @YourCustomValidator
    private String value;

    @Override
    public String getValue() { return this.value; }

    public void setValue(String v) { this.value = v; }
}

and then implement a custom Jackson Deserializer which is able to build an instance of A by inspecting the JSON string field type.

I don't think that Drools has anything to do with this question.