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/*
* Copyright (C) 2020 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 com.google.auto.common.MoreElements.asType;
import static com.google.auto.common.MoreTypes.asDeclared;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Iterables.getOnlyElement;
import static dagger.internal.codegen.binding.AssistedInjectionAnnotations.assistedFactoryMethod;
import static dagger.internal.codegen.binding.AssistedInjectionAnnotations.assistedFactoryParameterSpecs;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;
import com.squareup.javapoet.TypeSpec;
import dagger.internal.codegen.binding.BindingRequest;
import dagger.internal.codegen.binding.ProvisionBinding;
import dagger.internal.codegen.javapoet.Expression;
import dagger.internal.codegen.langmodel.DaggerElements;
import dagger.internal.codegen.langmodel.DaggerTypes;
import dagger.model.DependencyRequest;
import dagger.model.RequestKind;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
/**
* A {@link dagger.internal.codegen.writing.BindingExpression} for {@link
* dagger.assisted.AssistedFactory} methods.
*/
final class AssistedFactoryBindingExpression extends SimpleInvocationBindingExpression {
private final ProvisionBinding binding;
private final ComponentBindingExpressions componentBindingExpressions;
private final DaggerElements elements;
private final DaggerTypes types;
AssistedFactoryBindingExpression(
ProvisionBinding binding,
ComponentBindingExpressions componentBindingExpressions,
DaggerTypes types,
DaggerElements elements) {
super(binding);
this.binding = checkNotNull(binding);
this.componentBindingExpressions = checkNotNull(componentBindingExpressions);
this.elements = checkNotNull(elements);
this.types = checkNotNull(types);
}
@Override
Expression getDependencyExpression(ClassName requestingClass) {
// An assisted factory binding should have a single request for an assisted injection type.
DependencyRequest assistedInjectionRequest = getOnlyElement(binding.provisionDependencies());
Expression assistedInjectionExpression =
componentBindingExpressions.getDependencyExpression(
BindingRequest.bindingRequest(assistedInjectionRequest.key(), RequestKind.INSTANCE),
// This is kind of gross because the anonymous class doesn't really have a name we can
// reference. The requesting class name is really only needed to determine if we need to
// append "OwningClass.this." to the method call or not.
// TODO(bcorso): We should probably use a non-anonymous class here instead so that we
// actually have a proper class name.
requestingClass.peerClass(""));
return Expression.create(
assistedInjectionExpression.type(),
CodeBlock.of("$L", anonymousfactoryImpl(assistedInjectionExpression)));
}
private TypeSpec anonymousfactoryImpl(Expression assistedInjectionExpression) {
TypeElement factory = asType(binding.bindingElement().get());
DeclaredType factoryType = asDeclared(binding.key().type());
ExecutableElement factoryMethod = assistedFactoryMethod(factory, elements);
// We can't use MethodSpec.overriding directly because we need to control the parameter names.
MethodSpec factoryOverride = MethodSpec.overriding(factoryMethod, factoryType, types).build();
TypeSpec.Builder builder =
TypeSpec.anonymousClassBuilder("")
.addMethod(
MethodSpec.methodBuilder(factoryMethod.getSimpleName().toString())
.addModifiers(factoryOverride.modifiers)
.addTypeVariables(factoryOverride.typeVariables)
.returns(factoryOverride.returnType)
.addAnnotations(factoryOverride.annotations)
.addExceptions(factoryOverride.exceptions)
.addParameters(assistedFactoryParameterSpecs(binding, elements, types))
.addStatement("return $L", assistedInjectionExpression.codeBlock())
.build());
if (factory.getKind() == ElementKind.INTERFACE) {
builder.addSuperinterface(TypeName.get(factoryType));
} else {
builder.superclass(TypeName.get(factoryType));
}
return builder.build();
}
}
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