注釈プロセッサにネストされた注釈からクラス[]値を読み取る方法

アフマドBawaneh：

私は親注釈の値は、子注釈の配列であるネストされた注釈を持って、アノテーション処理ツールを使用して、いくつかのコードを生成しようとしている、と子注釈値はクラスの配列です。

注釈：

public @interface ParentAnnotation {
    ChildAnnotation[] value();
}
public @interface ChildAnnotation {
    Class<?>[] value();
}

使用法：

@ParentAnnotation(
{
      @ChildAnnotation({Foo.class, Bar.class}),
      @ChildAnnotation({Goo.class, Doo.class})
})
public class Sample{
}

呼び出しvalue()私と注釈にProcessorサブタイプはこの例外で失敗します。

Error:java: error while creating source file javax.lang.model.type.MirroredTypeException: Attempt to access Class object for TypeMirror org.dominokit.samples.layout.shared.extension.LayoutEvent
    at com.sun.tools.javac.model.AnnotationProxyMaker$MirroredTypeExceptionProxy.generateException(AnnotationProxyMaker.java:308)
    at sun.reflect.annotation.AnnotationInvocationHandler.invoke(AnnotationInvocationHandler.java:84)
    at com.sun.proxy.$Proxy28.value(Unknown Source)
    at org.dominokit.domino.apt.client.processors.module.client.presenters.PresenterProxySourceWriter.generateFireActivationEvent(PresenterProxySourceWriter.java:238)
    at org.dominokit.domino.apt.client.processors.module.client.presenters.PresenterProxySourceWriter.asTypeBuilder(PresenterProxySourceWriter.java:64)
    at org.dominokit.domino.apt.client.processors.module.client.presenters.PresenterProxyProcessingStep.generateProxy(PresenterProxyProcessingStep.java:66)
    at org.dominokit.domino.apt.client.processors.module.client.presenters.PresenterProxyProcessingStep.process(PresenterProxyProcessingStep.java:53)
    at org.dominokit.domino.apt.client.processors.module.client.presenters.PresenterProxyProcessor.process(PresenterProxyProcessor.java:61)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
    at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
    at com.sun.tools.javac.main.Main.compile(Main.java:523)
    at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
    at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
    at org.jetbrains.jps.javac.JavacMain.compile(JavacMain.java:196)
    at org.jetbrains.jps.incremental.java.JavaBuilder.compileJava(JavaBuilder.java:448)
    at org.jetbrains.jps.incremental.java.JavaBuilder.compile(JavaBuilder.java:318)
    at org.jetbrains.jps.incremental.java.JavaBuilder.doBuild(JavaBuilder.java:243)
    at org.jetbrains.jps.incremental.java.JavaBuilder.build(JavaBuilder.java:201)
    at org.jetbrains.jps.incremental.IncProjectBuilder.runModuleLevelBuilders(IncProjectBuilder.java:1327)
    at org.jetbrains.jps.incremental.IncProjectBuilder.runBuildersForChunk(IncProjectBuilder.java:1007)
    at org.jetbrains.jps.incremental.IncProjectBuilder.buildTargetsChunk(IncProjectBuilder.java:1074)
    at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunkIfAffected(IncProjectBuilder.java:968)
    at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunks(IncProjectBuilder.java:797)
    at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:375)
    at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:178)
    at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:138)
    at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:302)
    at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:135)
    at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:229)
    at org.jetbrains.jps.service.impl.SharedThreadPoolImpl.lambda$executeOnPooledThread$0(SharedThreadPoolImpl.java:42)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

ので、どのように私は、注釈からこれらのクラスを読み込むことができますかList<TypeMirror>？

アフマドBawaneh：

、アイデアは使用方法で、デバッグ、一度に一つのことをしようと、多くの後、私はこのための解決策を見つけたAnnotationMirror得るためにAnnotationValue、期待リターンタイプはすべきいくつかの点での混乱のいくつかの並べ替えがあったAnnotationValue[]実際ましたがList<AnnotationValue>以下です、私のようにクラスを読み取るために書いたユーティリティメソッドList<List<TypeMirror>>：

private List<List<TypeMirror>> getNestedAnnotationClassesValue(Element element){

        List<List<TypeMirror>> classesInAnntation = new ArrayList<>();
        if (nonNull(element.getAnnotation(ParentAnnotation.class))) {
            List<? extends AnnotationMirror> annotations = element.getAnnotationMirrors();
            for (AnnotationMirror annotationMirror : annotations) {
                if (types.isSameType(annotationMirror.getAnnotationType(), elements.getTypeElement(ParentAnnotation.class.getName()).asType())) {
                    Map<? extends ExecutableElement, ? extends AnnotationValue> elementValues = annotationMirror.getElementValues();

                    elementValues.values()
                            .stream()
                            .findFirst()
                            .ifPresent(annotationValue -> {
                                List<AnnotationMirror> childAnnotations = (List<AnnotationMirror>) annotationValue.getValue();
                                childAnnotations.stream()
                                        .forEach(childAnnotationMirror -> {
                                            Collection<? extends AnnotationValue> values = childAnnotationMirror.getElementValues()
                                                    .values();
                                            AnnotationValue childAnnotationValue = values.stream().findFirst().get();
                                            List<AnnotationValue> classesInNestedAnnotation = (List<AnnotationValue>) childAnnotationValue.getValue();
                                            Iterator<? extends AnnotationValue> iterator = classesInNestedAnnotation.iterator();

                                            List<TypeMirror> typeMirrorsInNestedAnnotation = new ArrayList<>();

                                            while (iterator.hasNext()) {
                                                AnnotationValue next = iterator.next();
                                                typeMirrorsInNestedAnnotation.add((TypeMirror) next.getValue());
                                            }

                                            if (!typeMirrorsInNestedAnnotation.isEmpty()) {
                                                classesInAnntation.add(typeMirrorsInNestedAnnotation);
                                            }
                                        });
                            });
                }
            }
        }
        return classesInAnntation;
    }