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/*
* 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;
import static com.google.auto.common.MoreTypes.asDeclared;
import static com.google.common.base.Preconditions.checkState;
import static dagger.internal.codegen.langmodel.DaggerElements.closestEnclosingTypeElement;
import com.google.auto.common.MoreElements;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import dagger.assisted.AssistedInject;
import dagger.internal.codegen.binding.AssistedInjectionAnnotations;
import dagger.internal.codegen.binding.AssistedInjectionAnnotations.AssistedParameter;
import dagger.internal.codegen.langmodel.DaggerTypes;
import dagger.internal.codegen.validation.TypeCheckingProcessingStep;
import dagger.internal.codegen.validation.ValidationReport;
import java.lang.annotation.Annotation;
import java.util.HashSet;
import java.util.Set;
import javax.annotation.processing.Messager;
import javax.inject.Inject;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.type.DeclaredType;
/** An annotation processor for {@link dagger.assisted.AssistedInject}-annotated elements. */
final class AssistedInjectProcessingStep extends TypeCheckingProcessingStep<ExecutableElement> {
private final DaggerTypes types;
private final Messager messager;
@Inject
AssistedInjectProcessingStep(DaggerTypes types, Messager messager) {
super(MoreElements::asExecutable);
this.types = types;
this.messager = messager;
}
@Override
public ImmutableSet<Class<? extends Annotation>> annotations() {
return ImmutableSet.of(AssistedInject.class);
}
@Override
protected void process(
ExecutableElement assistedInjectElement,
ImmutableSet<Class<? extends Annotation>> annotations) {
new AssistedInjectValidator().validate(assistedInjectElement).printMessagesTo(messager);
}
private final class AssistedInjectValidator {
ValidationReport<ExecutableElement> validate(ExecutableElement constructor) {
checkState(constructor.getKind() == ElementKind.CONSTRUCTOR);
ValidationReport.Builder<ExecutableElement> report = ValidationReport.about(constructor);
DeclaredType assistedInjectType =
asDeclared(closestEnclosingTypeElement(constructor).asType());
ImmutableList<AssistedParameter> assistedParameters =
AssistedInjectionAnnotations.assistedInjectAssistedParameters(assistedInjectType, types);
Set<AssistedParameter> uniqueAssistedParameters = new HashSet<>();
for (AssistedParameter assistedParameter : assistedParameters) {
if (!uniqueAssistedParameters.add(assistedParameter)) {
report.addError(
"@AssistedInject constructor has duplicate @Assisted type: " + assistedParameter,
assistedParameter.variableElement());
}
}
return report.build();
}
}
}
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