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/*
* Copyright (C) 2017 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.common.collect.Iterables.getOnlyElement;
import static dagger.internal.codegen.binding.BindingRequest.bindingRequest;
import static dagger.internal.codegen.langmodel.Accessibility.isTypeAccessibleFrom;
import static dagger.internal.codegen.xprocessing.XProcessingEnvs.isPreJava8SourceVersion;
import androidx.room.compiler.processing.XProcessingEnv;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import com.squareup.javapoet.TypeName;
import dagger.assisted.Assisted;
import dagger.assisted.AssistedFactory;
import dagger.assisted.AssistedInject;
import dagger.internal.codegen.base.OptionalType;
import dagger.internal.codegen.base.OptionalType.OptionalKind;
import dagger.internal.codegen.binding.ProvisionBinding;
import dagger.internal.codegen.javapoet.Expression;
import dagger.internal.codegen.model.DependencyRequest;
import dagger.internal.codegen.model.RequestKind;
/** A binding expression for optional bindings. */
final class OptionalRequestRepresentation extends RequestRepresentation {
private final ProvisionBinding binding;
private final ComponentRequestRepresentations componentRequestRepresentations;
private final XProcessingEnv processingEnv;
@AssistedInject
OptionalRequestRepresentation(
@Assisted ProvisionBinding binding,
ComponentImplementation componentImplementation,
ComponentRequestRepresentations componentRequestRepresentations,
XProcessingEnv processingEnv) {
this.binding = binding;
this.componentRequestRepresentations = componentRequestRepresentations;
this.processingEnv = processingEnv;
}
@Override
Expression getDependencyExpression(ClassName requestingClass) {
OptionalType optionalType = OptionalType.from(binding.key());
OptionalKind optionalKind = optionalType.kind();
if (binding.dependencies().isEmpty()) {
if (isPreJava8SourceVersion(processingEnv)) {
// When compiling with -source 7, javac's type inference isn't strong enough to detect
// Futures.immediateFuture(Optional.absent()) for keys that aren't Object. It also has
// issues
// when used as an argument to some members injection proxy methods (see
// https://github.com/google/dagger/issues/916)
if (isTypeAccessibleFrom(
binding.key().type().xprocessing(), requestingClass.packageName())) {
return Expression.create(
binding.key().type().xprocessing(),
optionalKind.parameterizedAbsentValueExpression(optionalType));
}
}
return Expression.create(
binding.key().type().xprocessing(), optionalKind.absentValueExpression());
}
DependencyRequest dependency = getOnlyElement(binding.dependencies());
CodeBlock dependencyExpression =
componentRequestRepresentations
.getDependencyExpression(bindingRequest(dependency), requestingClass)
.codeBlock();
boolean needsObjectExpression = !isTypeAccessibleFrom(
dependency.key().type().xprocessing(), requestingClass.packageName())
|| (isPreJava8SourceVersion(processingEnv) && dependency.kind() == RequestKind.PROVIDER);
return !needsObjectExpression
? Expression.create(
binding.key().type().xprocessing(),
optionalKind.presentExpression(dependencyExpression))
// If the dependency type is inaccessible, then we have to use Optional.<Object>of(...), or
// else we will get "incompatible types: inference variable has incompatible bounds.
: Expression.create(
processingEnv.getDeclaredType(
processingEnv.findTypeElement(optionalKind.className()),
processingEnv.findType(TypeName.OBJECT)),
optionalKind.presentObjectExpression(dependencyExpression));
}
@AssistedFactory
static interface Factory {
OptionalRequestRepresentation create(ProvisionBinding binding);
}
}
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