dagger.internal.codegen.InjectProcessingStep.java Source code

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Here is the source code for dagger.internal.codegen.InjectProcessingStep.java

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/*
 * Copyright (C) 2014 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 com.google.auto.common.BasicAnnotationProcessor;
import com.google.auto.common.MoreElements;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.SetMultimap;
import java.lang.annotation.Annotation;
import java.util.Set;
import javax.inject.Inject;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.util.ElementKindVisitor6;

/**
 * An annotation processor for generating Dagger implementation code based on the {@link Inject}
 * annotation.
 *
 * @author Gregory Kick
 * @since 2.0
 */
final class InjectProcessingStep implements BasicProcessor.ProcessingStep {
    private final InjectBindingRegistry injectBindingRegistry;

    InjectProcessingStep(InjectBindingRegistry factoryRegistrar) {
        this.injectBindingRegistry = factoryRegistrar;
    }

    @Override
    public Set<Class<? extends Annotation>> annotations() {
        return ImmutableSet.<Class<? extends Annotation>>of(Inject.class);
    }

    @Override
    public Set<Element> process(SetMultimap<Class<? extends Annotation>, Element> elementsByAnnotation,
            boolean anyElementsRejected) {
        ImmutableSet.Builder<Element> rejectedElements = ImmutableSet.builder();
        // TODO(gak): add some error handling for bad source files

        for (Element injectElement : elementsByAnnotation.get(Inject.class)) {
            try {
                injectElement.accept(new ElementKindVisitor6<Void, Void>() {
                    @Override
                    public Void visitExecutableAsConstructor(ExecutableElement constructorElement, Void v) {
                        injectBindingRegistry.tryRegisterConstructor(constructorElement);
                        return null;
                    }

                    @Override
                    public Void visitVariableAsField(VariableElement fieldElement, Void p) {
                        injectBindingRegistry.tryRegisterMembersInjectedType(
                                MoreElements.asType(fieldElement.getEnclosingElement()));
                        return null;
                    }

                    @Override
                    public Void visitExecutableAsMethod(ExecutableElement methodElement, Void p) {
                        injectBindingRegistry.tryRegisterMembersInjectedType(
                                MoreElements.asType(methodElement.getEnclosingElement()));
                        return null;
                    }
                }, null);
            } catch (TypeNotPresentException e) {
                rejectedElements.add(injectElement);
            }
        }

        return rejectedElements.build();
    }
}