74 lines
2.8 KiB
Java
74 lines
2.8 KiB
Java
/*
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* Copyright (C) 2018 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.base.Preconditions.checkNotNull;
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import static dagger.internal.codegen.binding.BindingRequest.bindingRequest;
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import com.google.common.util.concurrent.Futures;
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import com.google.common.util.concurrent.ListenableFuture;
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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.javapoet.Expression;
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import dagger.internal.codegen.langmodel.DaggerTypes;
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import dagger.model.Key;
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import dagger.model.RequestKind;
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import javax.lang.model.SourceVersion;
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final class ImmediateFutureBindingExpression extends BindingExpression {
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private final Key key;
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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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ImmediateFutureBindingExpression(
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Key key,
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ComponentBindingExpressions componentBindingExpressions,
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DaggerTypes types,
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SourceVersion sourceVersion) {
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this.key = key;
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this.componentBindingExpressions = checkNotNull(componentBindingExpressions);
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this.types = checkNotNull(types);
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this.sourceVersion = checkNotNull(sourceVersion);
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}
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@Override
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Expression getDependencyExpression(ClassName requestingClass) {
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return Expression.create(
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types.wrapType(key.type(), ListenableFuture.class),
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CodeBlock.of("$T.immediateFuture($L)", Futures.class, instanceExpression(requestingClass)));
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}
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private CodeBlock instanceExpression(ClassName requestingClass) {
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Expression expression =
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componentBindingExpressions.getDependencyExpression(
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bindingRequest(key, RequestKind.INSTANCE), requestingClass);
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if (sourceVersion.compareTo(SourceVersion.RELEASE_7) <= 0) {
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// Java 7 type inference is not as strong as in Java 8, and therefore some generated code must
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// cast.
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//
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// For example, javac7 cannot detect that Futures.immediateFuture(ImmutableSet.of("T"))
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// can safely be assigned to ListenableFuture<Set<T>>.
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if (!types.isSameType(expression.type(), key.type())) {
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return CodeBlock.of(
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"($T) $L", types.accessibleType(key.type(), requestingClass), expression.codeBlock());
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}
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}
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return expression.codeBlock();
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}
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}
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