| /* |
| * Copyright (C) 2020 The Dagger Authors. |
| * |
| * 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 dagger.hilt.processor.internal.aliasof; |
| |
| import static com.google.common.base.Suppliers.memoize; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.base.Supplier; |
| import com.google.common.collect.ImmutableMultimap; |
| import com.google.common.collect.ImmutableSet; |
| import com.squareup.javapoet.ClassName; |
| import dagger.hilt.processor.internal.ClassNames; |
| import dagger.hilt.processor.internal.ProcessorErrors; |
| import dagger.hilt.processor.internal.Processors; |
| import java.util.List; |
| import javax.annotation.processing.ProcessingEnvironment; |
| import javax.lang.model.element.AnnotationMirror; |
| import javax.lang.model.element.Element; |
| import javax.lang.model.element.ElementKind; |
| import javax.lang.model.element.PackageElement; |
| import javax.lang.model.element.TypeElement; |
| import javax.lang.model.util.Elements; |
| |
| /** |
| * Extracts a multimap of aliases annotated with {@link dagger.hilt.migration.AliasOf} mapping them |
| * to scopes they are alias of. |
| */ |
| public final class AliasOfs { |
| static final String AGGREGATING_PACKAGE = AliasOfs.class.getPackage().getName() + ".codegen"; |
| |
| private final ProcessingEnvironment processingEnvironment; |
| private final ImmutableSet<ClassName> defineComponentScopes; |
| private final Supplier<ImmutableMultimap<ClassName, ClassName>> aliases = |
| memoize(() -> getAliases()); |
| |
| public AliasOfs( |
| ProcessingEnvironment processingEnvironment, ImmutableSet<ClassName> defineComponentScopes) { |
| this.defineComponentScopes = defineComponentScopes; |
| this.processingEnvironment = processingEnvironment; |
| } |
| |
| public ImmutableSet<ClassName> getAliasesFor(ClassName defineComponentScope) { |
| return ImmutableSet.copyOf(aliases.get().get(defineComponentScope)); |
| } |
| |
| private ImmutableMultimap<ClassName, ClassName> getAliases() { |
| Elements elements = processingEnvironment.getElementUtils(); |
| PackageElement packageElement = elements.getPackageElement(AGGREGATING_PACKAGE); |
| if (packageElement == null) { |
| return ImmutableMultimap.of(); |
| } |
| List<? extends Element> scopeAliasElements = packageElement.getEnclosedElements(); |
| Preconditions.checkState( |
| !scopeAliasElements.isEmpty(), "No scope aliases Found in package %s.", packageElement); |
| |
| ImmutableMultimap.Builder<ClassName, ClassName> builder = ImmutableMultimap.builder(); |
| for (Element element : scopeAliasElements) { |
| ProcessorErrors.checkState( |
| element.getKind() == ElementKind.CLASS, |
| element, |
| "Only classes may be in package %s. Did you add custom code in the package?", |
| packageElement); |
| |
| AnnotationMirror annotationMirror = |
| Processors.getAnnotationMirror(element, ClassNames.ALIAS_OF_PROPAGATED_DATA); |
| |
| ProcessorErrors.checkState( |
| annotationMirror != null, |
| element, |
| "Classes in package %s must be annotated with @%s: %s." |
| + " Found: %s. Files in this package are generated, did you add custom code in the" |
| + " package? ", |
| packageElement, |
| ClassNames.ALIAS_OF_PROPAGATED_DATA, |
| element.getSimpleName(), |
| element.getAnnotationMirrors()); |
| |
| TypeElement defineComponentScope = |
| Processors.getAnnotationClassValue(elements, annotationMirror, "defineComponentScope"); |
| TypeElement alias = Processors.getAnnotationClassValue(elements, annotationMirror, "alias"); |
| |
| Preconditions.checkState( |
| defineComponentScopes.contains(ClassName.get(defineComponentScope)), |
| "The scope %s cannot be an alias for %s. You can only have aliases of a scope defined" |
| + " directly on a @DefineComponent type.", |
| ClassName.get(alias), |
| ClassName.get(defineComponentScope)); |
| |
| builder.put(ClassName.get(defineComponentScope), ClassName.get(alias)); |
| } |
| |
| return builder.build(); |
| } |
| } |