112 lines
5.1 KiB
Java
112 lines
5.1 KiB
Java
/*
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* Copyright (C) 2020 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.internal.codegen.writing;
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import static com.google.auto.common.MoreElements.asType;
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import static com.google.auto.common.MoreTypes.asDeclared;
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import static com.google.common.base.Preconditions.checkNotNull;
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import static com.google.common.collect.Iterables.getOnlyElement;
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import static dagger.internal.codegen.binding.AssistedInjectionAnnotations.assistedFactoryMethod;
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import static dagger.internal.codegen.binding.AssistedInjectionAnnotations.assistedFactoryParameterSpecs;
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import com.squareup.javapoet.ClassName;
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import com.squareup.javapoet.CodeBlock;
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import com.squareup.javapoet.MethodSpec;
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import com.squareup.javapoet.TypeName;
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import com.squareup.javapoet.TypeSpec;
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import dagger.internal.codegen.binding.BindingRequest;
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import dagger.internal.codegen.binding.ProvisionBinding;
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import dagger.internal.codegen.javapoet.Expression;
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import dagger.internal.codegen.langmodel.DaggerElements;
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import dagger.internal.codegen.langmodel.DaggerTypes;
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import dagger.model.DependencyRequest;
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import dagger.model.RequestKind;
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import javax.lang.model.element.ElementKind;
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import javax.lang.model.element.ExecutableElement;
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import javax.lang.model.element.TypeElement;
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import javax.lang.model.type.DeclaredType;
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/**
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* A {@link dagger.internal.codegen.writing.BindingExpression} for {@link
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* dagger.assisted.AssistedFactory} methods.
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*/
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final class AssistedFactoryBindingExpression extends SimpleInvocationBindingExpression {
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private final ProvisionBinding binding;
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private final ComponentBindingExpressions componentBindingExpressions;
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private final DaggerElements elements;
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private final DaggerTypes types;
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AssistedFactoryBindingExpression(
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ProvisionBinding binding,
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ComponentBindingExpressions componentBindingExpressions,
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DaggerTypes types,
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DaggerElements elements) {
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super(binding);
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this.binding = checkNotNull(binding);
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this.componentBindingExpressions = checkNotNull(componentBindingExpressions);
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this.elements = checkNotNull(elements);
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this.types = checkNotNull(types);
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}
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@Override
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Expression getDependencyExpression(ClassName requestingClass) {
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// An assisted factory binding should have a single request for an assisted injection type.
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DependencyRequest assistedInjectionRequest = getOnlyElement(binding.provisionDependencies());
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Expression assistedInjectionExpression =
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componentBindingExpressions.getDependencyExpression(
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BindingRequest.bindingRequest(assistedInjectionRequest.key(), RequestKind.INSTANCE),
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// This is kind of gross because the anonymous class doesn't really have a name we can
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// reference. The requesting class name is really only needed to determine if we need to
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// append "OwningClass.this." to the method call or not.
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// TODO(bcorso): We should probably use a non-anonymous class here instead so that we
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// actually have a proper class name.
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requestingClass.peerClass(""));
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return Expression.create(
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assistedInjectionExpression.type(),
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CodeBlock.of("$L", anonymousfactoryImpl(assistedInjectionExpression)));
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}
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private TypeSpec anonymousfactoryImpl(Expression assistedInjectionExpression) {
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TypeElement factory = asType(binding.bindingElement().get());
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DeclaredType factoryType = asDeclared(binding.key().type());
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ExecutableElement factoryMethod = assistedFactoryMethod(factory, elements);
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// We can't use MethodSpec.overriding directly because we need to control the parameter names.
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MethodSpec factoryOverride = MethodSpec.overriding(factoryMethod, factoryType, types).build();
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TypeSpec.Builder builder =
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TypeSpec.anonymousClassBuilder("")
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.addMethod(
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MethodSpec.methodBuilder(factoryMethod.getSimpleName().toString())
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.addModifiers(factoryOverride.modifiers)
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.addTypeVariables(factoryOverride.typeVariables)
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.returns(factoryOverride.returnType)
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.addAnnotations(factoryOverride.annotations)
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.addExceptions(factoryOverride.exceptions)
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.addParameters(assistedFactoryParameterSpecs(binding, elements, types))
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.addStatement("return $L", assistedInjectionExpression.codeBlock())
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.build());
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if (factory.getKind() == ElementKind.INTERFACE) {
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builder.addSuperinterface(TypeName.get(factoryType));
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} else {
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builder.superclass(TypeName.get(factoryType));
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}
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return builder.build();
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}
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}
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