问题描述
public class Launch {
public static void main(String[] args) {
System.out.println("hello");
testAnn(15);
}
private static void testAnn(@IntRange(minValue = 1,maxValue = 10)int babyAge) {
System.out.println("babyAge is :"+babyAge);
}
}
我正在尝试创建一个自定义批注以验证整数值范围,该批注采用min
和max
值,因此,如果有人使用此范围之外的整数值调用此函数,将会出现一条消息错误,并带有一些提示,指出发生了什么问题。
我正在使用Java注释过程来获取值并将其与max/min
中包含的@IntRange
进行比较
这就是我得到的:
@Override
public boolean process(Set<? extends TypeElement> annotations,RoundEnvironment roundEnv) {
for(TypeElement annotaion: annotations) {
Set<? extends Element> annotatedElements = roundEnv.getElementsAnnotatedWith(IntRange.class);
for (Element element : annotatedElements) {
Executable methodElement= (Executable) element.asType();
ExecutableType methodExcutableType = (ExecutableType) element.asType();
String elementParamClassName = methodElement.getParameterTypes()[0].getCanonicalName();
if(!elementParamClassName.equals(ParaM_TYPE_NAME)) {
messager.printMessage(Diagnostic.Kind.ERROR,"Parameter type should be int not "+elementParamClassName);
}else {
IntRange rangeAnno = element.getAnnotation(IntRange.class);
int maxValue = rangeAnno.maxValue();
int minValue = rangeAnno.minValue();
//code to retrive argument passed to the function with
//annotated parameter (@IntRange(..))
}
}
}
return true;
}