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java - 如何访问 APT 中的@XmlElement 值?

转载 作者:行者123 更新时间:2023-11-30 09:34:30 26 4
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我在编译时用APT处理注解,我需要在某些类中获取@XmlElement注解的值。该类看起来像这样:

public class ComponentConfig {

@XmlElements({
@XmlElement(type = Sample1.class, name = "sample-1-config"),
@XmlElement(type = Sample2.class, name = "sample-2-config"),
@XmlElement(type = Sample3.class, name = "sample-3-config"),
})

//...
}

我想获取 @XmlElementname 值,但以下处理器代码无法为我获取它:

List<? extends AnnotationMirror> annotationMirrors = element.getAnnotationMirrors();
for (AnnotationMirror mirror : annotationMirrors) {
if (mirror.getAnnotationType().toString().equals(XML_ELEMENT)) {
System.out.println(getAnnotationValueMapValueOfName(mirror));
nodes.add(getAnnotationValueMapValueOfName(mirror));
}
}

最佳答案

它不是 APT,但它适用于 AbstractProcessor JDK6+的:

@Override
public boolean process(final Set<? extends TypeElement> annotations,
final RoundEnvironment roundEnv) {
checkEnvironmentChange();
System.out.println(" > ---- process2 method starts " + hashCode());
System.out.println(" > annotations: " + annotations);

for (final TypeElement annotation: annotations) {
System.out.println(" > annotation: " + annotation.toString());
processAnnotation(roundEnv, annotation);
}
System.out.println(" > processingOver: " + roundEnv.processingOver());
System.out.println(" > ---- process2 method ends " + hashCode());
return false;
}

private void processAnnotation(final RoundEnvironment roundEnv,
final TypeElement annotation) {
final Set<? extends Element> annotateds =
roundEnv.getElementsAnnotatedWith(annotation);
for (final Element element: annotateds) {
processElement(element);
}
}

private void processElement(final Element element) {
System.out.println(" > class: " + element);
System.out.println(" > class2: " + element.getClass());
final List<? extends Element> enclosedElements =
element.getEnclosedElements();
for (final Element enclosedElement: enclosedElements) {
processEnclosedElement(enclosedElement);
}
}

private void processEnclosedElement(final Element enclosedElement) {
final XmlElements xmlElements =
enclosedElement.getAnnotation(XmlElements.class);
if (xmlElements == null) {
return;
}
final XmlElement[] xmlElemntValues = xmlElements.value();
for (final XmlElement xmlElementValue: xmlElemntValues) {
System.out.println(" > name: " + xmlElementValue.name());
}
}

输出:

[...]
> annotations: [hu.palacsint.annotation.MyAnnotation]
> annotation: hu.palacsint.annotation.MyAnnotation
> class: hu.palacsint.annotation.p2.ClassTwo
> class2: class com.sun.tools.javac.code.Symbol$ClassSymbol
> name: sample-1-config
> name: sample-2-config
> name: sample-3-config
> processingOver: false
[...]

我之前的问题也有帮助:Processing different annotations with the same Processor instance

关于java - 如何访问 APT 中的@XmlElement 值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11772516/

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