/* * Copyright (c) Facebook, Inc. and its affiliates. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.facebook.litho.specmodels.processor; import com.facebook.litho.specmodels.internal.ImmutableList; import com.squareup.javapoet.AnnotationSpec; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.util.ArrayList; import java.util.List; import javax.lang.model.element.AnnotationMirror; import javax.lang.model.element.TypeElement; /** Helper for extracting annotations from a given {@link TypeElement}. */ public class AnnotationExtractor { public static ImmutableList<AnnotationSpec> extractValidAnnotations(TypeElement element) { final List<AnnotationSpec> annotations = new ArrayList<>(); for (AnnotationMirror annotationMirror : element.getAnnotationMirrors()) { if (isValidAnnotation(annotationMirror)) { annotations.add(AnnotationSpec.get(annotationMirror)); } } return ImmutableList.copyOf(annotations); } /** * We consider an annotation to be valid for extraction if it's not an internal annotation (i.e. * is in the <code>com.facebook.litho</code> package and is not a source-only annotation. * * <p>We also do not consider the kotlin.Metadata annotation to be valid as it represents the * metadata of the Spec class and not of the class that we are generating. * * @return Whether or not to extract the given annotation. */ private static boolean isValidAnnotation(AnnotationMirror annotation) { final Retention retention = annotation.getAnnotationType().asElement().getAnnotation(Retention.class); if (retention != null && retention.value() == RetentionPolicy.SOURCE) { return false; } String annotationName = annotation.getAnnotationType().toString(); return !annotationName.startsWith("com.facebook.") && !annotationName.equals("kotlin.Metadata"); } }