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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;
import static javax.tools.Diagnostic.Kind.ERROR;
import com.android.dialer.inject.IncludeInDialerRoot;
import com.android.dialer.inject.InstallIn;
import com.android.dialer.inject.RootComponentGeneratorMetadata;
import com.google.auto.common.BasicAnnotationProcessor.ProcessingStep;
import com.google.auto.common.MoreElements;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.SetMultimap;
import com.squareup.javapoet.AnnotationSpec;
import com.squareup.javapoet.TypeSpec;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.Set;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
/**
* Genereates metadata for every type annotated by {@link InstallIn} and {@link
* IncludeInDialerRoot}.
*
* <p>The metadata has the information where the annotated types are and it is used by annotation
* processor when the processor tries to generate root component.
*/
final class MetadataGeneratingStep implements ProcessingStep {
private final ProcessingEnvironment processingEnv;
MetadataGeneratingStep(ProcessingEnvironment processingEnv) {
this.processingEnv = processingEnv;
}
@Override
public Set<? extends Class<? extends Annotation>> annotations() {
return ImmutableSet.of(IncludeInDialerRoot.class, InstallIn.class);
}
@Override
public Set<? extends Element> process(
SetMultimap<Class<? extends Annotation>, Element> elementsByAnnotation) {
for (Element element : elementsByAnnotation.get(IncludeInDialerRoot.class)) {
generateMetadataFor(IncludeInDialerRoot.class, MoreElements.asType(element));
}
for (Element element : elementsByAnnotation.get(InstallIn.class)) {
if (element.getAnnotation(InstallIn.class).variants().length == 0) {
processingEnv
.getMessager()
.printMessage(
ERROR, String.format("@InstallIn %s must have at least one variant", element));
continue;
}
generateMetadataFor(InstallIn.class, MoreElements.asType(element));
}
return Collections.emptySet();
}
private void generateMetadataFor(
Class<? extends Annotation> annotation, TypeElement annotatedElement) {
TypeSpec.Builder metadataClassBuilder =
TypeSpec.classBuilder(
annotatedElement.getQualifiedName().toString().replace('.', '_') + "Metadata");
metadataClassBuilder.addAnnotation(
AnnotationSpec.builder(RootComponentGeneratorMetadata.class)
.addMember("tag", "$S", annotation.getSimpleName())
.addMember("annotatedClass", "$T.class", annotatedElement.asType())
.build());
TypeSpec metadataClass = metadataClassBuilder.build();
RootComponentUtils.writeJavaFile(
processingEnv, RootComponentUtils.METADATA_PACKAGE_NAME, metadataClass);
}
}
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