1 /* 2 * Copyright (C) 2020 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.internal.codegen.writing; 18 19 import static com.google.common.base.Preconditions.checkArgument; 20 import static com.google.common.base.Preconditions.checkNotNull; 21 import static com.google.common.collect.Iterables.getOnlyElement; 22 import static dagger.internal.codegen.binding.AssistedInjectionAnnotations.assistedFactoryMethod; 23 import static dagger.internal.codegen.writing.AssistedInjectionParameters.assistedFactoryParameterSpecs; 24 import static dagger.internal.codegen.xprocessing.MethodSpecs.overriding; 25 import static dagger.internal.codegen.xprocessing.XElements.asTypeElement; 26 27 import androidx.room.compiler.processing.XMethodElement; 28 import androidx.room.compiler.processing.XType; 29 import androidx.room.compiler.processing.XTypeElement; 30 import com.squareup.javapoet.ClassName; 31 import com.squareup.javapoet.CodeBlock; 32 import com.squareup.javapoet.MethodSpec; 33 import com.squareup.javapoet.TypeSpec; 34 import dagger.assisted.Assisted; 35 import dagger.assisted.AssistedFactory; 36 import dagger.assisted.AssistedInject; 37 import dagger.internal.codegen.binding.Binding; 38 import dagger.internal.codegen.binding.BindingGraph; 39 import dagger.internal.codegen.binding.ProvisionBinding; 40 import dagger.internal.codegen.javapoet.Expression; 41 import dagger.internal.codegen.model.DependencyRequest; 42 import java.util.Optional; 43 44 /** 45 * A {@link dagger.internal.codegen.writing.RequestRepresentation} for {@link 46 * dagger.assisted.AssistedFactory} methods. 47 */ 48 final class AssistedFactoryRequestRepresentation extends RequestRepresentation { 49 private final ProvisionBinding binding; 50 private final BindingGraph graph; 51 private final SimpleMethodRequestRepresentation.Factory simpleMethodRequestRepresentationFactory; 52 private final ComponentImplementation componentImplementation; 53 54 @AssistedInject AssistedFactoryRequestRepresentation( @ssisted ProvisionBinding binding, BindingGraph graph, ComponentImplementation componentImplementation, SimpleMethodRequestRepresentation.Factory simpleMethodRequestRepresentationFactory)55 AssistedFactoryRequestRepresentation( 56 @Assisted ProvisionBinding binding, 57 BindingGraph graph, 58 ComponentImplementation componentImplementation, 59 SimpleMethodRequestRepresentation.Factory simpleMethodRequestRepresentationFactory) { 60 this.binding = checkNotNull(binding); 61 this.graph = graph; 62 this.componentImplementation = componentImplementation; 63 this.simpleMethodRequestRepresentationFactory = simpleMethodRequestRepresentationFactory; 64 } 65 66 @Override getDependencyExpression(ClassName requestingClass)67 Expression getDependencyExpression(ClassName requestingClass) { 68 // An assisted factory binding should have a single request for an assisted injection type. 69 DependencyRequest assistedInjectionRequest = getOnlyElement(binding.provisionDependencies()); 70 // Get corresponding assisted injection binding. 71 Optional<Binding> localBinding = graph.localContributionBinding(assistedInjectionRequest.key()); 72 checkArgument( 73 localBinding.isPresent(), 74 "assisted factory should have a dependency on an assisted injection binding"); 75 Expression assistedInjectionExpression = 76 simpleMethodRequestRepresentationFactory 77 .create((ProvisionBinding) localBinding.get()) 78 .getDependencyExpression(requestingClass.peerClass("")); 79 return Expression.create( 80 assistedInjectionExpression.type(), 81 CodeBlock.of("$L", anonymousfactoryImpl(localBinding.get(), assistedInjectionExpression))); 82 } 83 anonymousfactoryImpl( Binding assistedBinding, Expression assistedInjectionExpression)84 private TypeSpec anonymousfactoryImpl( 85 Binding assistedBinding, Expression assistedInjectionExpression) { 86 XTypeElement factory = asTypeElement(binding.bindingElement().get()); 87 XType factoryType = binding.key().type().xprocessing(); 88 XMethodElement factoryMethod = assistedFactoryMethod(factory); 89 90 // We can't use MethodSpec.overriding directly because we need to control the parameter names. 91 MethodSpec factoryOverride = overriding(factoryMethod, factoryType).build(); 92 TypeSpec.Builder builder = 93 TypeSpec.anonymousClassBuilder("") 94 .addMethod( 95 // We're overriding the method so we have to use the jvm name here. 96 MethodSpec.methodBuilder(factoryMethod.getJvmName()) 97 .addModifiers(factoryOverride.modifiers) 98 .addTypeVariables(factoryOverride.typeVariables) 99 .returns(factoryOverride.returnType) 100 .addAnnotations(factoryOverride.annotations) 101 .addExceptions(factoryOverride.exceptions) 102 .addParameters( 103 assistedFactoryParameterSpecs( 104 binding, componentImplementation.shardImplementation(assistedBinding))) 105 .addStatement("return $L", assistedInjectionExpression.codeBlock()) 106 .build()); 107 108 if (factory.isInterface()) { 109 builder.addSuperinterface(factoryType.getTypeName()); 110 } else { 111 builder.superclass(factoryType.getTypeName()); 112 } 113 114 return builder.build(); 115 } 116 117 @AssistedFactory 118 static interface Factory { create(ProvisionBinding binding)119 AssistedFactoryRequestRepresentation create(ProvisionBinding binding); 120 } 121 } 122