| /* |
| * Copyright (C) 2018 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.internal.codegen.writing; |
| |
| import static dagger.internal.codegen.writing.ComponentImplementation.FieldSpecKind.FRAMEWORK_FIELD; |
| import static javax.lang.model.element.Modifier.PRIVATE; |
| |
| import com.squareup.javapoet.CodeBlock; |
| import com.squareup.javapoet.FieldSpec; |
| import com.squareup.javapoet.TypeName; |
| import dagger.internal.codegen.binding.ComponentDescriptor.ComponentMethodDescriptor; |
| import dagger.internal.codegen.javapoet.Expression; |
| import dagger.internal.codegen.langmodel.DaggerTypes; |
| import dagger.model.RequestKind; |
| import dagger.producers.Producer; |
| import dagger.producers.internal.CancellationListener; |
| import dagger.producers.internal.Producers; |
| import java.util.Optional; |
| import javax.lang.model.type.TypeMirror; |
| |
| /** |
| * A factory of {@linkplain Producers#entryPointViewOf(Producer, CancellationListener) entry point |
| * views} of {@link Producer}s. |
| */ |
| final class ProducerEntryPointView { |
| private final DaggerTypes types; |
| |
| ProducerEntryPointView(DaggerTypes types) { |
| this.types = types; |
| } |
| |
| /** |
| * Returns an expression for an {@linkplain Producers#entryPointViewOf(Producer, |
| * CancellationListener) entry point view} of a producer if the component method returns a {@link |
| * Producer} or {@link com.google.common.util.concurrent.ListenableFuture}. |
| * |
| * <p>This is intended to be a replacement implementation for {@link |
| * dagger.internal.codegen.writing.BindingExpression#getDependencyExpressionForComponentMethod(ComponentMethodDescriptor, |
| * ComponentImplementation)}, and in cases where {@link Optional#empty()} is returned, callers |
| * should call {@code super.getDependencyExpressionForComponentMethod()}. |
| */ |
| Optional<Expression> getProducerEntryPointField( |
| BindingExpression producerExpression, |
| ComponentMethodDescriptor componentMethod, |
| ComponentImplementation component) { |
| if (component.componentDescriptor().isProduction() |
| && (componentMethod.dependencyRequest().get().kind().equals(RequestKind.FUTURE) |
| || componentMethod.dependencyRequest().get().kind().equals(RequestKind.PRODUCER))) { |
| return Optional.of( |
| Expression.create( |
| fieldType(componentMethod), |
| "$N", |
| createField(producerExpression, componentMethod, component))); |
| } else { |
| // If the component isn't a production component, it won't implement CancellationListener and |
| // as such we can't create an entry point. But this binding must also just be a Producer from |
| // Provider anyway in that case, so there shouldn't be an issue. |
| // TODO(b/116855531): Is it really intended that a non-production component can have Producer |
| // entry points? |
| return Optional.empty(); |
| } |
| } |
| |
| private FieldSpec createField( |
| BindingExpression producerExpression, |
| ComponentMethodDescriptor componentMethod, |
| ComponentImplementation component) { |
| // TODO(cgdecker): Use a FrameworkFieldInitializer for this? |
| // Though I don't think we need the once-only behavior of that, since I think |
| // getComponentMethodImplementation will only be called once anyway |
| String methodName = componentMethod.methodElement().getSimpleName().toString(); |
| FieldSpec field = |
| FieldSpec.builder( |
| TypeName.get(fieldType(componentMethod)), |
| component.getUniqueFieldName(methodName + "EntryPoint"), |
| PRIVATE) |
| .build(); |
| component.addField(FRAMEWORK_FIELD, field); |
| |
| CodeBlock fieldInitialization = |
| CodeBlock.of( |
| "this.$N = $T.entryPointViewOf($L, this);", |
| field, |
| Producers.class, |
| producerExpression.getDependencyExpression(component.name()).codeBlock()); |
| component.addInitialization(fieldInitialization); |
| |
| return field; |
| } |
| |
| // TODO(cgdecker): Can we use producerExpression.getDependencyExpression().type() instead of |
| // needing to (re)compute this? |
| private TypeMirror fieldType(ComponentMethodDescriptor componentMethod) { |
| return types.wrapType(componentMethod.dependencyRequest().get().key().type(), Producer.class); |
| } |
| } |