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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.android.dialer.rootcomponentgenerator.processor;
import static com.google.auto.common.AnnotationMirrors.getAnnotationValue;
import static com.google.auto.common.MoreElements.getAnnotationMirror;
import static com.google.auto.common.MoreElements.isAnnotationPresent;
import com.android.dialer.rootcomponentgenerator.annotation.DialerComponent;
import com.android.dialer.rootcomponentgenerator.annotation.DialerRootComponent;
import com.android.dialer.rootcomponentgenerator.annotation.DialerVariant;
import com.android.dialer.rootcomponentgenerator.annotation.InstallIn;
import com.android.dialer.rootcomponentgenerator.annotation.RootComponentGeneratorMetadata;
import com.google.auto.common.BasicAnnotationProcessor.ProcessingStep;
import com.google.auto.common.MoreElements;
import com.google.common.base.Optional;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.SetMultimap;
import com.squareup.javapoet.AnnotationSpec;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.TypeSpec;
import dagger.Component;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import javax.annotation.processing.ProcessingEnvironment;
import javax.inject.Singleton;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;
/** Generates root component for a java type annotated with {@link DialerRootComponent}. */
final class RootComponentGeneratingStep implements ProcessingStep {
private final ProcessingEnvironment processingEnv;
public RootComponentGeneratingStep(ProcessingEnvironment processingEnv) {
this.processingEnv = processingEnv;
}
@Override
public Set<? extends Class<? extends Annotation>> annotations() {
return ImmutableSet.of(DialerRootComponent.class);
}
@Override
public Set<? extends Element> process(
SetMultimap<Class<? extends Annotation>, Element> elementsByAnnotation) {
for (Element element : elementsByAnnotation.get(DialerRootComponent.class)) {
generateRootComponent(MoreElements.asType(element));
}
return Collections.emptySet();
}
/**
* Generates a root component.
*
* @param rootElement the annotated type with {@link DialerRootComponent} used in annotation
* processor.
*/
private void generateRootComponent(TypeElement rootElement) {
DialerRootComponent dialerRootComponent = rootElement.getAnnotation(DialerRootComponent.class);
ListMultimap<DialerVariant, TypeElement> componentModuleMap = generateComponentModuleMap();
List<TypeElement> componentList = generateComponentList();
DialerVariant dialerVariant = dialerRootComponent.variant();
TypeSpec.Builder rootComponentClassBuilder =
TypeSpec.interfaceBuilder(dialerVariant.toString())
.addModifiers(Modifier.PUBLIC)
.addAnnotation(Singleton.class);
for (TypeElement componentWithSuperInterface : componentList) {
rootComponentClassBuilder.addSuperinterface(
ClassName.get(componentWithSuperInterface)
.peerClass(
RootComponentUtils.GENERATED_COMPONENT_PREFIX
+ componentWithSuperInterface.getSimpleName())
.nestedClass("HasComponent"));
}
AnnotationSpec.Builder componentAnnotation = AnnotationSpec.builder(Component.class);
for (TypeElement annotatedElement : componentModuleMap.get(dialerVariant)) {
componentAnnotation.addMember("modules", "$T.class", annotatedElement.asType());
}
rootComponentClassBuilder.addAnnotation(componentAnnotation.build());
TypeSpec rootComponentClass = rootComponentClassBuilder.build();
RootComponentUtils.writeJavaFile(
processingEnv, ClassName.get(rootElement).packageName(), rootComponentClass);
}
private List<TypeElement> generateComponentList() {
List<TypeElement> list = new ArrayList<>();
extractInfoFromMetadata(DialerComponent.class, list::add);
return list;
}
private ListMultimap<DialerVariant, TypeElement> generateComponentModuleMap() {
ListMultimap<DialerVariant, TypeElement> map = ArrayListMultimap.create();
extractInfoFromMetadata(
InstallIn.class,
(annotatedElement) -> {
for (DialerVariant rootComponentName :
annotatedElement.getAnnotation(InstallIn.class).variants()) {
map.put(rootComponentName, annotatedElement);
}
});
return map;
}
private void extractInfoFromMetadata(
Class<? extends Annotation> annotation, MetadataProcessor metadataProcessor) {
PackageElement cachePackage =
processingEnv.getElementUtils().getPackageElement(RootComponentUtils.METADATA_PACKAGE_NAME);
for (Element element : cachePackage.getEnclosedElements()) {
Optional<AnnotationMirror> metadataAnnotation =
getAnnotationMirror(element, RootComponentGeneratorMetadata.class);
if (isAnnotationPresent(element, RootComponentGeneratorMetadata.class)
&& getAnnotationValue(metadataAnnotation.get(), "tag")
.getValue()
.equals(annotation.getSimpleName())) {
TypeMirror annotatedClass =
(TypeMirror) getAnnotationValue(metadataAnnotation.get(), "annotatedClass").getValue();
TypeElement annotatedElement =
processingEnv.getElementUtils().getTypeElement(annotatedClass.toString());
metadataProcessor.process(annotatedElement);
}
}
}
private interface MetadataProcessor {
void process(TypeElement typeElement);
}
}
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