100 lines
3.9 KiB
Java
100 lines
3.9 KiB
Java
/*
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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.hilt.processor.internal;
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import static dagger.internal.codegen.extension.DaggerStreams.toImmutableSet;
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import static javax.lang.model.element.Modifier.PUBLIC;
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import com.google.auto.common.MoreElements;
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import com.google.common.collect.ImmutableSet;
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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.PackageElement;
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import javax.lang.model.element.TypeElement;
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import javax.lang.model.util.Elements;
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/** Utility class for aggregating metadata. */
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public final class AggregatedElements {
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/** Returns the class name of the proxy or {@link Optional#empty()} if a proxy is not needed. */
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public static Optional<ClassName> aggregatedElementProxyName(TypeElement aggregatedElement) {
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if (aggregatedElement.getModifiers().contains(PUBLIC)) {
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// Public aggregated elements do not have proxies.
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return Optional.empty();
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}
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ClassName name = ClassName.get(aggregatedElement);
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// To avoid going over the class name size limit, just prepend a single character.
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return Optional.of(name.peerClass("_" + name.simpleName()));
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}
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/** Returns back the set of input {@code aggregatedElements} with all proxies unwrapped. */
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public static ImmutableSet<TypeElement> unwrapProxies(
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ImmutableSet<TypeElement> aggregatedElements, Elements elements) {
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return aggregatedElements.stream()
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.map(aggregatedElement -> unwrapProxy(aggregatedElement, elements))
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.collect(toImmutableSet());
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}
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private static TypeElement unwrapProxy(TypeElement element, Elements elements) {
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return Processors.hasAnnotation(element, ClassNames.AGGREGATED_ELEMENT_PROXY)
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? Processors.getAnnotationClassValue(
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elements,
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Processors.getAnnotationMirror(element, ClassNames.AGGREGATED_ELEMENT_PROXY),
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"value")
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: element;
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}
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/** Returns all aggregated elements in the aggregating package after validating them. */
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public static ImmutableSet<TypeElement> from(
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String aggregatingPackage, ClassName aggregatingAnnotation, Elements elements) {
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PackageElement packageElement = elements.getPackageElement(aggregatingPackage);
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if (packageElement == null) {
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return ImmutableSet.of();
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}
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ImmutableSet<TypeElement> aggregatedElements =
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packageElement.getEnclosedElements().stream()
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.map(MoreElements::asType)
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// We're only interested in returning the original deps here. Proxies will be generated
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// (if needed) and swapped just before generating @ComponentTreeDeps.
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.filter(
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element -> !Processors.hasAnnotation(element, ClassNames.AGGREGATED_ELEMENT_PROXY))
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.collect(toImmutableSet());
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ProcessorErrors.checkState(
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!aggregatedElements.isEmpty(),
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packageElement,
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"No dependencies found. Did you remove code in package %s?",
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packageElement);
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for (TypeElement aggregatedElement : aggregatedElements) {
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ProcessorErrors.checkState(
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Processors.hasAnnotation(aggregatedElement, aggregatingAnnotation),
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aggregatedElement,
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"Expected element, %s, to be annotated with @%s, but only found: %s.",
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aggregatedElement.getSimpleName(),
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aggregatingAnnotation,
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aggregatedElement.getAnnotationMirrors());
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}
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return aggregatedElements;
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}
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private AggregatedElements() {}
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}
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