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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 com.android.dialer.inject.DialerRootComponent;
import com.android.dialer.inject.DialerVariant;
import com.android.dialer.inject.GenerateDaggerApp;
import com.android.dialer.inject.HasRootComponent;
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.ClassName;
import com.squareup.javapoet.FieldSpec;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;
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.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
/**
* Generates an application class with dagger component instance for a type annotated with {@link
* GenerateDaggerApp}.
*
* <p>Generated code example:
*
* <p><code>
* @DialerRootComponent(variant = DialerVariant.DIALER_TEST)
* class GeneratedApplication extends Application implements HasRootComponent {
* private volatile Object rootComponent;
*
* @Override
* @NonNull
* public final Object component() {
* Object result = rootComponent;
* if (result == null) {
* synchronized (this) {
* result = rootComponent;
* if (result == null) {
* rootComponent =
* result = DaggerDialerTest.builder().contextModule(new ContextModule(this)).build();
* }
* }
* }
* return result;
* }
* }
* </code>
*/
public class DaggerApplicationGeneratingStep implements ProcessingStep {
private static final ClassName ANDROID_APPLICATION_CLASS_NAME =
ClassName.get("android.app", "Application");
private final ProcessingEnvironment processingEnv;
public DaggerApplicationGeneratingStep(ProcessingEnvironment processingEnv) {
this.processingEnv = processingEnv;
}
@Override
public Set<? extends Class<? extends Annotation>> annotations() {
return ImmutableSet.of(GenerateDaggerApp.class);
}
@Override
public Set<? extends Element> process(
SetMultimap<Class<? extends Annotation>, Element> elementsByAnnotation) {
for (Element element : elementsByAnnotation.get(GenerateDaggerApp.class)) {
GenerateDaggerApp generateDaggerApp = element.getAnnotation(GenerateDaggerApp.class);
RootComponentUtils.writeJavaFile(
processingEnv,
ClassName.get(MoreElements.asType(element)).packageName(),
generateDaggerApplication(generateDaggerApp.name(), generateDaggerApp.variant()));
}
return Collections.emptySet();
}
private TypeSpec generateDaggerApplication(String name, DialerVariant variant) {
return TypeSpec.classBuilder(name)
.addAnnotation(
AnnotationSpec.builder(DialerRootComponent.class)
.addMember("variant", "$T.$L", DialerVariant.class, variant.name())
.build())
.superclass(ANDROID_APPLICATION_CLASS_NAME)
.addSuperinterface(HasRootComponent.class)
.addField(
FieldSpec.builder(TypeName.OBJECT, "rootComponent", Modifier.PRIVATE, Modifier.VOLATILE)
.build())
.addMethod(generateComponentMethod(variant))
.build();
}
private MethodSpec generateComponentMethod(DialerVariant dialerVariant) {
return MethodSpec.overriding(getComponentMethodFromHasRootComponent())
.addModifiers(Modifier.FINAL)
.addAnnotation(ClassName.get("android.support.annotation", "NonNull"))
.addStatement("$T result = rootComponent", TypeName.OBJECT)
.beginControlFlow("if (result == null)")
.beginControlFlow("synchronized (this)")
.addStatement("result = rootComponent")
.beginControlFlow("if (result == null)")
.addStatement(
"rootComponent = result = Dagger$L.builder().contextModule(new $T(this)).build()",
dialerVariant,
ClassName.get("com.android.dialer.inject", "ContextModule"))
.endControlFlow()
.endControlFlow()
.endControlFlow()
.addStatement("return result")
.build();
}
private ExecutableElement getComponentMethodFromHasRootComponent() {
TypeElement hasRootComponentInterafce =
processingEnv.getElementUtils().getTypeElement(HasRootComponent.class.getTypeName());
for (Element element : hasRootComponentInterafce.getEnclosedElements()) {
if (element.getSimpleName().contentEquals("component")) {
return MoreElements.asExecutable(element);
}
}
throw new RuntimeException("No component method inside HasRootComponent!");
}
}
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