95 lines
3.9 KiB
Java
95 lines
3.9 KiB
Java
/*
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* Copyright (C) 2017 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.common.collect.Iterables.getOnlyElement;
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import static dagger.internal.codegen.binding.BindingRequest.bindingRequest;
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import static dagger.internal.codegen.langmodel.Accessibility.isTypeAccessibleFrom;
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import com.squareup.javapoet.ClassName;
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import com.squareup.javapoet.CodeBlock;
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import dagger.internal.codegen.base.OptionalType;
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import dagger.internal.codegen.base.OptionalType.OptionalKind;
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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.DaggerTypes;
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import dagger.model.DependencyRequest;
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import javax.inject.Inject;
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import javax.lang.model.SourceVersion;
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/** A binding expression for optional bindings. */
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final class OptionalBindingExpression extends SimpleInvocationBindingExpression {
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private final ProvisionBinding binding;
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private final ComponentBindingExpressions componentBindingExpressions;
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private final DaggerTypes types;
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private final SourceVersion sourceVersion;
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@Inject
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OptionalBindingExpression(
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ProvisionBinding binding,
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ComponentBindingExpressions componentBindingExpressions,
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DaggerTypes types,
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SourceVersion sourceVersion) {
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super(binding);
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this.binding = binding;
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this.componentBindingExpressions = componentBindingExpressions;
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this.types = types;
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this.sourceVersion = sourceVersion;
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}
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@Override
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Expression getDependencyExpression(ClassName requestingClass) {
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OptionalType optionalType = OptionalType.from(binding.key());
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OptionalKind optionalKind = optionalType.kind();
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if (binding.dependencies().isEmpty()) {
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if (sourceVersion.compareTo(SourceVersion.RELEASE_7) <= 0) {
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// When compiling with -source 7, javac's type inference isn't strong enough to detect
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// Futures.immediateFuture(Optional.absent()) for keys that aren't Object. It also has
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// issues
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// when used as an argument to some members injection proxy methods (see
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// https://github.com/google/dagger/issues/916)
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if (isTypeAccessibleFrom(binding.key().type(), requestingClass.packageName())) {
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return Expression.create(
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binding.key().type(), optionalKind.parameterizedAbsentValueExpression(optionalType));
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}
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}
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return Expression.create(binding.key().type(), optionalKind.absentValueExpression());
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}
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DependencyRequest dependency = getOnlyElement(binding.dependencies());
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CodeBlock dependencyExpression =
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componentBindingExpressions
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.getDependencyExpression(bindingRequest(dependency), requestingClass)
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.codeBlock();
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// If the dependency type is inaccessible, then we have to use Optional.<Object>of(...), or else
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// we will get "incompatible types: inference variable has incompatible bounds.
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return isTypeAccessibleFrom(dependency.key().type(), requestingClass.packageName())
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? Expression.create(
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binding.key().type(), optionalKind.presentExpression(dependencyExpression))
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: Expression.create(
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types.erasure(binding.key().type()),
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optionalKind.presentObjectExpression(dependencyExpression));
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}
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@Override
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boolean requiresMethodEncapsulation() {
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// TODO(dpb): Maybe require it for present bindings.
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return false;
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}
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}
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