62 lines
2.6 KiB
Java
62 lines
2.6 KiB
Java
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/*
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* Copyright (C) 2021 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.android.processor;
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import com.google.auto.common.MoreElements;
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import com.squareup.javapoet.ClassName;
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import java.util.Optional;
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import javax.lang.model.element.AnnotationMirror;
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import javax.lang.model.element.Element;
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import javax.lang.model.element.TypeElement;
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// TODO(bcorso): Dedupe with dagger/internal/codegen/langmodel/DaggerElements.java?
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// TODO(bcorso): Contribute upstream to auto common?
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/** Similar to auto common, but uses {@link ClassName} rather than {@link Class}. */
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final class MoreDaggerElements {
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/**
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* Returns {@code true} iff the given element has an {@link AnnotationMirror} whose {@linkplain
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* AnnotationMirror#getAnnotationType() annotation type} has the same canonical name as that of
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* {@code annotationClass}. This method is a safer alternative to calling {@link
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* Element#getAnnotation} and checking for {@code null} as it avoids any interaction with
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* annotation proxies.
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*/
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public static boolean isAnnotationPresent(Element element, ClassName annotationName) {
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return getAnnotationMirror(element, annotationName).isPresent();
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}
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/**
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* Returns an {@link AnnotationMirror} for the annotation of type {@code annotationClass} on
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* {@code element}, or {@link Optional#empty()} if no such annotation exists. This method is a
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* safer alternative to calling {@link Element#getAnnotation} as it avoids any interaction with
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* annotation proxies.
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*/
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public static Optional<AnnotationMirror> getAnnotationMirror(
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Element element, ClassName annotationName) {
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String annotationClassName = annotationName.canonicalName();
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for (AnnotationMirror annotationMirror : element.getAnnotationMirrors()) {
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TypeElement annotationTypeElement =
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MoreElements.asType(annotationMirror.getAnnotationType().asElement());
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if (annotationTypeElement.getQualifiedName().contentEquals(annotationClassName)) {
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return Optional.of(annotationMirror);
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}
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}
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return Optional.empty();
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}
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private MoreDaggerElements() {}
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}
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