dagger.internal.codegen.writing.SwitchingProviderInstanceSupplier Maven / Gradle / Ivy
/*
* Copyright (C) 2021 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.javapoet.TypeNames.DOUBLE_CHECK;
import static dagger.internal.codegen.javapoet.TypeNames.SINGLE_CHECK;
import com.squareup.javapoet.CodeBlock;
import dagger.assisted.Assisted;
import dagger.assisted.AssistedFactory;
import dagger.assisted.AssistedInject;
import dagger.internal.codegen.binding.Binding;
import dagger.internal.codegen.binding.BindingGraph;
import dagger.internal.codegen.binding.ProvisionBinding;
import dagger.internal.codegen.model.BindingKind;
import dagger.internal.codegen.writing.ComponentImplementation.ShardImplementation;
import dagger.internal.codegen.writing.FrameworkFieldInitializer.FrameworkInstanceCreationExpression;
/**
* An object that initializes a framework-type component field for a binding using instances created
* by switching providers.
*/
final class SwitchingProviderInstanceSupplier implements FrameworkInstanceSupplier {
private final FrameworkInstanceSupplier frameworkInstanceSupplier;
@AssistedInject
SwitchingProviderInstanceSupplier(
@Assisted ProvisionBinding binding,
BindingGraph graph,
ComponentImplementation componentImplementation,
UnscopedDirectInstanceRequestRepresentationFactory
unscopedDirectInstanceRequestRepresentationFactory) {
ShardImplementation shardImplementation = componentImplementation.shardImplementation(binding);
FrameworkInstanceCreationExpression frameworkInstanceCreationExpression =
shardImplementation
.getSwitchingProviders()
.newFrameworkInstanceCreationExpression(
binding, unscopedDirectInstanceRequestRepresentationFactory.create(binding));
this.frameworkInstanceSupplier =
new FrameworkFieldInitializer(
componentImplementation, binding, scope(binding, frameworkInstanceCreationExpression));
}
@Override
public MemberSelect memberSelect() {
return frameworkInstanceSupplier.memberSelect();
}
private FrameworkInstanceCreationExpression scope(
Binding binding, FrameworkInstanceCreationExpression unscoped) {
// Caching assisted factory provider, so that there won't be new factory created for each
// provider.get() call.
if (!binding.scope().isPresent() && !binding.kind().equals(BindingKind.ASSISTED_FACTORY)) {
return unscoped;
}
return () ->
CodeBlock.of(
"$T.provider($L)",
binding.scope().isPresent()
? (binding.scope().get().isReusable()
? SINGLE_CHECK
: DOUBLE_CHECK)
: SINGLE_CHECK,
unscoped.creationExpression());
}
@AssistedFactory
static interface Factory {
SwitchingProviderInstanceSupplier create(ProvisionBinding binding);
}
}