Java 使用注释处理器获取已注释类的声明字段
我有一个注释处理器,需要获取与元素关联的类,以便检索其声明的字段:Java 使用注释处理器获取已注释类的声明字段,java,annotations,processor,Java,Annotations,Processor,我有一个注释处理器,需要获取与元素关联的类,以便检索其声明的字段: @Override public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { String className = null; String packageName = null; String fqClassName = null; List&
@Override
public boolean process(Set<? extends TypeElement> annotations,
RoundEnvironment roundEnv) {
String className = null;
String packageName = null;
String fqClassName = null;
List<String> fields = new LinkedList<String>();
for (Element elem : roundEnv.getElementsAnnotatedWith(FieldConstant.class)) {
if (elem.getKind() == ElementKind.CLASS) {
// Encrypt encrypt = elem.getAnnotation(Encrypt.class);
// String message = "annotation found in " + elem.getSimpleName();
// processingEnv.getMessager().printMessage(Kind.NOTE, message);
TypeElement classElement = (TypeElement) elem;
PackageElement packageElement = (PackageElement) classElement.getEnclosingElement();
className = classElement.getSimpleName().toString();
for(Field field : classElement.getClass().getDeclaredFields()){
do something...
}
.....
@覆盖
公共布尔过程(Set您不能对正常编译的代码使用反射,因为代码可能在前一个过程中被修改或生成(如何将它们添加到类路径??)
但是好消息是,您可以使用javax.lang.model
中的包来获取字段的属性
以下示例将所有字段定义打印到System.out
(可能缺少一些关键字,例如transient
):
@覆盖
public boolean process(SET)不太清楚您正在尝试执行的操作。您有一个类列表,并尝试查找使用注释注释的类?
@Override
public boolean process(Set<? extends TypeElement> annotations,
RoundEnvironment roundEnv) {
for (Element elem : roundEnv.getElementsAnnotatedWith(FieldConstant.class)) {
if (elem.getKind() == ElementKind.CLASS) {
// print fields
for (Element enclosedElement : elem.getEnclosedElements()) {
if (enclosedElement.getKind() == ElementKind.FIELD) {
Set<Modifier> modifiers = enclosedElement.getModifiers();
StringBuilder sb = new StringBuilder();
if (modifiers.contains(Modifier.PRIVATE)) {
sb.append("private ");
} else if (modifiers.contains(Modifier.PROTECTED)) {
sb.append("protected ");
} else if (modifiers.contains(Modifier.PUBLIC)) {
sb.append("public ");
}
if (modifiers.contains(Modifier.STATIC))
sb.append("static ");
if (modifiers.contains(Modifier.FINAL))
sb.append("final ");
sb.append(enclosedElement.asType()).append(" ").append(enclosedElement.getSimpleName());
System.out.println(sb);
}
}
}
}
...