| /* |
| * Copyright (C) 2019 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.android.processor.internal.androidentrypoint; |
| |
| import com.google.auto.common.MoreElements; |
| import com.google.auto.common.Visibility; |
| import com.squareup.javapoet.AnnotationSpec; |
| import com.squareup.javapoet.ClassName; |
| import com.squareup.javapoet.JavaFile; |
| import com.squareup.javapoet.MethodSpec; |
| import com.squareup.javapoet.TypeSpec; |
| import com.squareup.javapoet.TypeVariableName; |
| import dagger.hilt.android.processor.internal.AndroidClassNames; |
| import dagger.hilt.processor.internal.Processors; |
| import java.io.IOException; |
| import java.util.List; |
| import javax.annotation.processing.ProcessingEnvironment; |
| import javax.lang.model.element.Element; |
| import javax.lang.model.element.ExecutableElement; |
| import javax.lang.model.element.TypeElement; |
| import javax.lang.model.element.VariableElement; |
| import javax.lang.model.type.TypeKind; |
| import javax.lang.model.type.TypeMirror; |
| import javax.lang.model.util.ElementFilter; |
| |
| /** Generates an Hilt View class for the @AndroidEntryPoint annotated class. */ |
| public final class ViewGenerator { |
| private final ProcessingEnvironment env; |
| private final AndroidEntryPointMetadata metadata; |
| private final ClassName generatedClassName; |
| |
| public ViewGenerator(ProcessingEnvironment env, AndroidEntryPointMetadata metadata) { |
| this.env = env; |
| this.metadata = metadata; |
| |
| generatedClassName = metadata.generatedClassName(); |
| } |
| |
| // @Generated("ViewGenerator") |
| // abstract class Hilt_$CLASS extends $BASE implements |
| // ComponentManagerHolder<ViewComponentManager<$CLASS_EntryPoint>> { |
| // ... |
| // } |
| public void generate() throws IOException { |
| // Note: we do not use the Generators helper methods here because injection is called |
| // from the constructor where the double-check pattern doesn't work (due to the super |
| // constructor being called before fields are initialized) and because it isn't necessary |
| // since the object isn't done constructing yet. |
| |
| TypeSpec.Builder builder = |
| TypeSpec.classBuilder(generatedClassName.simpleName()) |
| .addOriginatingElement(metadata.element()) |
| .superclass(metadata.baseClassName()) |
| .addModifiers(metadata.generatedClassModifiers()); |
| |
| Generators.addGeneratedBaseClassJavadoc(builder, AndroidClassNames.ANDROID_ENTRY_POINT); |
| Processors.addGeneratedAnnotation(builder, env, getClass()); |
| Generators.copyLintAnnotations(metadata.element(), builder); |
| |
| metadata.baseElement().getTypeParameters().stream() |
| .map(TypeVariableName::get) |
| .forEachOrdered(builder::addTypeVariable); |
| |
| Generators.addComponentOverride(metadata, builder); |
| |
| Generators.addInjectionMethods(metadata, builder); |
| |
| ElementFilter.constructorsIn(metadata.baseElement().getEnclosedElements()).stream() |
| .filter(this::isConstructorVisibleToGeneratedClass) |
| .forEach(constructor -> builder.addMethod(constructorMethod(constructor))); |
| |
| JavaFile.builder(generatedClassName.packageName(), builder.build()) |
| .build() |
| .writeTo(env.getFiler()); |
| } |
| |
| private boolean isConstructorVisibleToGeneratedClass(ExecutableElement constructorElement) { |
| if (Visibility.ofElement(constructorElement) == Visibility.DEFAULT |
| && !isInOurPackage(constructorElement)) { |
| return false; |
| } else if (Visibility.ofElement(constructorElement) == Visibility.PRIVATE) { |
| return false; |
| } |
| |
| // We extend the base class, so both protected and public methods are always accessible. |
| return true; |
| } |
| |
| /** |
| * Returns a pass-through constructor matching the base class's provided constructorElement. The |
| * generated constructor simply calls super(), then inject(). |
| * |
| * <p>Eg |
| * |
| * <pre> |
| * Hilt_$CLASS(Context context, ...) { |
| * super(context, ...); |
| * inject(); |
| * } |
| * </pre> |
| */ |
| private MethodSpec constructorMethod(ExecutableElement constructorElement) { |
| MethodSpec.Builder constructor = |
| Generators.copyConstructor(constructorElement).toBuilder(); |
| |
| if (isRestrictedApiConstructor(constructorElement)) { |
| // 4 parameter constructors are only available on @TargetApi(21). |
| constructor.addAnnotation( |
| AnnotationSpec.builder(AndroidClassNames.TARGET_API).addMember("value", "21").build()); |
| } |
| |
| constructor.addStatement("inject()"); |
| |
| return constructor.build(); |
| } |
| |
| private boolean isRestrictedApiConstructor(ExecutableElement constructor) { |
| if (constructor.getParameters().size() != 4) { |
| return false; |
| } |
| |
| List<? extends VariableElement> constructorParams = constructor.getParameters(); |
| for (int i = 0; i < constructorParams.size(); i++) { |
| TypeMirror type = constructorParams.get(i).asType(); |
| Element element = env.getTypeUtils().asElement(type); |
| switch (i) { |
| case 0: |
| if (!isFirstRestrictedParameter(element)) { |
| return false; |
| } |
| break; |
| case 1: |
| if (!isSecondRestrictedParameter(element)) { |
| return false; |
| } |
| break; |
| case 2: |
| if (!isThirdRestrictedParameter(type)) { |
| return false; |
| } |
| break; |
| case 3: |
| if (!isFourthRestrictedParameter(type)) { |
| return false; |
| } |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| private static boolean isFourthRestrictedParameter(TypeMirror type) { |
| return type.getKind().isPrimitive() |
| && Processors.getPrimitiveType(type).getKind() == TypeKind.INT; |
| } |
| |
| private static boolean isThirdRestrictedParameter(TypeMirror type) { |
| return type.getKind().isPrimitive() |
| && Processors.getPrimitiveType(type).getKind() == TypeKind.INT; |
| } |
| |
| private static boolean isSecondRestrictedParameter(Element element) { |
| return element instanceof TypeElement |
| && Processors.isAssignableFrom( |
| MoreElements.asType(element), AndroidClassNames.ATTRIBUTE_SET); |
| } |
| |
| private static boolean isFirstRestrictedParameter(Element element) { |
| return element instanceof TypeElement |
| && Processors.isAssignableFrom(MoreElements.asType(element), AndroidClassNames.CONTEXT); |
| } |
| |
| private boolean isInOurPackage(ExecutableElement constructorElement) { |
| return MoreElements.getPackage(constructorElement) |
| .equals(MoreElements.getPackage(metadata.element())); |
| } |
| } |