java - 具有 validator 继承的流畅 API - 输入 validator 实例似乎被识别为父类

Question

我正在编写一个流畅的 API 来验证 Map 中的 key:value 对。我有 validator 类型的层次结构。我引用了Fluent API with inheritance and generics的一个答案.

public interface IValidator {
    IValidator assertValue(String key, String expectedValue) throws Exception;

    abstract class Abstract implements IValidator {

        protected final Map<String, String> resultMap = new HashMap<>();

        @Override
        public <T extends IValidator> T assertValue(String key, String expectedValue) throws Exception {
            ...
            return (T) this;
    }
}

第二级抽象子类重新定义父类型，如下所示。

public abstract class AbstractValidator
extends IValidator.Abstract {
    // other logic not related to assertion
}

具体子类类似地重新定义父类型。

public class ExampleValidator
extends AbstractValidator
{
    public ExampleValidator assertPromptId(String expectedValue) throws Exception{
        assertValue(PROMPT_ID, expectedValue);
        return  this;
    }

    public ExampleValidator assertNameSpace(String expectedValue ) throws Exception{
        assertValue(NAMESPACE, expectedValue);
        return this;
    }

    @Override
    public ExampleValidator assertValue(String key, String  expectedVlaue) throws Exception {
        super.assertValue(key, expectedVlaue);
        return this;
    }

现在，我的测试用例如下。我的问题是 .withValidator(Ivalidator validator) 无法找到 assertPromptId() 和 assertNameSpace() 的方法，但只能找到 assertValue ()。那么如何解决呢？

public class AssertionContext {
    public <T extends IValidator> T withValidator(IValidator validator) throws Exception {
        return (T) validator;
    }
} 

// test method in main
public void invocationTest() throws Throwable {
        AssertionContext verify = new AssertionContext();
        verify.withValidator(new ExampleValidator()).assertNameSpace("...");
    }

Answer 1

其实我发现解决办法很简单。

public <T extends IValidator> T withValidator(T t) throws Exception {
    ...
    return t;
}