MyAnnotationProcessor.java

package study.java.jdks.version1_6.pluggable_annotation;

import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.ElementFilter;
import javax.tools.Diagnostic;

import jdk.nashorn.internal.runtime.regexp.RegExp;
import jdk.nashorn.internal.runtime.regexp.RegExpMatcher;

@SupportedAnnotationTypes("study.java.jdks.version1_6.pluggable_annotation.ToBeTested")//可以用"*"表示支持所有Annotations
//@SupportedAnnotationTypes("*")
@SupportedSourceVersion(SourceVersion.RELEASE_8)
public class MyAnnotationProcessor extends AbstractProcessor {
   private void note(String msg) {
       processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, msg);
   }
   public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
       //annotations的值是通过@SupportedAnnotationTypes声明的且目标源代码拥有的所有Annotations
       for(TypeElement te:annotations){
           note("annotation:"+te.toString());
       }
       Set<? extends Element> elements = roundEnv.getRootElements();//获取源代码的映射对象
      // elements.add(null);
       for(Element e:elements){
           //获取源代码对象的成员
           List<? extends Element> enclosedElems = e.getEnclosedElements();
           //留下方法成员,过滤掉其他成员
           List<? extends ExecutableElement> ees = ElementFilter.methodsIn(enclosedElems);
           for(ExecutableElement ee:ees){
        	   //if(methodName.tr)
        	   
               note("--ExecutableElement name is "+ee.getSimpleName());
               List<? extends AnnotationMirror> as = ee.getAnnotationMirrors();//获取方法的Annotations
               note("--as="+as); 
               for(AnnotationMirror am:as){
                   //获取Annotation的值
                   Map<? extends ExecutableElement, ? extends AnnotationValue> map= am.getElementValues();
                   Set<? extends ExecutableElement> ks = map.keySet();
                   for(ExecutableElement k:ks){//打印Annotation的每个值
                       AnnotationValue av = map.get(k);
                       note("----"+ee.getSimpleName()+"."+k.getSimpleName()+"="+av.getValue());
                   }
               }
           }
       }
       return false;
   }
}