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/*
* Copyright 2017 Google LLC
*
* 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.google.auto.value.extension.memoized.processor;
import static com.google.auto.value.extension.memoized.processor.ClassNames.MEMOIZED_NAME;
import static javax.lang.model.util.ElementFilter.methodsIn;
import static javax.tools.Diagnostic.Kind.ERROR;
import com.google.auto.common.MoreTypes;
import com.google.auto.service.AutoService;
import java.util.Optional;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Messager;
import javax.annotation.processing.Processor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import net.ltgt.gradle.incap.IncrementalAnnotationProcessor;
import net.ltgt.gradle.incap.IncrementalAnnotationProcessorType;
/**
* An annotation {@link Processor} that reports errors for {@code @Memoized} methods that are not
* inside {@code AutoValue}-annotated classes.
*/
@AutoService(Processor.class)
@IncrementalAnnotationProcessor(IncrementalAnnotationProcessorType.ISOLATING)
@SupportedAnnotationTypes(MEMOIZED_NAME)
public final class MemoizedValidator extends AbstractProcessor {
@Override
public final boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
Messager messager = processingEnv.getMessager();
TypeElement memoized = processingEnv.getElementUtils().getTypeElement(MEMOIZED_NAME);
for (ExecutableElement method : methodsIn(roundEnv.getElementsAnnotatedWith(memoized))) {
if (!isAutoValue(method.getEnclosingElement())) {
messager.printMessage(
ERROR,
"@Memoized methods must be declared only in @AutoValue classes",
method,
getAnnotationMirror(method, MEMOIZED_NAME).get());
}
}
return false;
}
@Override
public SourceVersion getSupportedSourceVersion() {
return SourceVersion.latestSupported();
}
private static boolean isAutoValue(Element element) {
return element.getAnnotationMirrors().stream()
.map(annotation -> MoreTypes.asTypeElement(annotation.getAnnotationType()))
.anyMatch(type -> type.getQualifiedName().contentEquals("com.google.auto.value.AutoValue"));
}
static Optional<AnnotationMirror> getAnnotationMirror(Element element, String annotationName) {
for (AnnotationMirror annotation : element.getAnnotationMirrors()) {
TypeElement annotationElement = MoreTypes.asTypeElement(annotation.getAnnotationType());
if (annotationElement.getQualifiedName().contentEquals(annotationName)) {
return Optional.of(annotation);
}
}
return Optional.empty();
}
}
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