public @interface CustomAnnotation {
String value();
}
@SupportedAnnotationTypes("CustomAnnotation")
@SupportedSourceVersion(SourceVersion.RELEASE_8)
public class CustomAnnotationProcessor extends AbstractProcessor {
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
for (TypeElement annotation : annotations) {
for (Element element : roundEnv.getElementsAnnotatedWith(annotation)) {
String code = generateCode(element);
insertCode(element, code);
}
}
return true;
}
private String generateCode(Element element) {
CustomAnnotation annotation = element.getAnnotation(CustomAnnotation.class);
String value = annotation.value();
return String.format("System.out.println(\"%s\");", value);
}
private void insertCode(Element element, String code) {
// ...
}
}
<build>
<plugins>
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<configuration>
<processors>
<processor>com.example.CustomAnnotationProcessor</processor>
</processors>
</configuration>
<dependencies>
<dependency>
<groupId>com.example</groupId>
<artifactId>alchemy-annotations</artifactId>
<version>1.0.0</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
@CustomAnnotation("Hello, Alchemy Annotations!")
public class MyClass {
// ...
}
shell
mvn clean compile
