/*
* Copyright (C) 2013 Google, Inc.
*
* 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 com.google.auto.factory.processor;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Messager;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.Processor;
import javax.annotation.processing.RoundEnvironment;
import javax.inject.Inject;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.ExecutableType;
import javax.lang.model.util.ElementFilter;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import javax.tools.Diagnostic.Kind;
import com.google.auto.factory.AutoFactory;
import com.google.auto.factory.Provided;
import com.google.auto.service.AutoService;
import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multimaps;
import dagger.ObjectGraph;
/**
* The annotation processor that generates factories for {@link AutoFactory} annotations.
*
* @author Gregory Kick
*/
@AutoService(Processor.class)
public final class AutoFactoryProcessor extends AbstractProcessor {
@Inject FactoryDescriptorGenerator factoryDescriptorGenerator;
@Inject AutoFactoryDeclaration.Factory declarationFactory;
@Inject ProvidedChecker providedChecker;
@Inject Messager messager;
@Inject Elements elements;
@Inject Types types;
@Inject FactoryWriter factoryWriter;
@Override
public synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
ObjectGraph.create(new ProcessorModule(processingEnv), new AutoFactoryProcessorModule())
.inject(this);
}
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
try {
doProcess(annotations, roundEnv);
} catch (Throwable e) {
messager.printMessage(Kind.ERROR, "Failed to process @AutoFactory annotations:\n"
+ Throwables.getStackTraceAsString(e));
}
return false;
}
private void doProcess(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
for (Element element : roundEnv.getElementsAnnotatedWith(Provided.class)) {
providedChecker.checkProvidedParameter(element);
}
ImmutableListMultimap.Builder<String, FactoryMethodDescriptor> indexedMethods =
ImmutableListMultimap.builder();
ImmutableSet.Builder<ImplemetationMethodDescriptor> implemetationMethodDescriptors =
ImmutableSet.builder();
for (Element element : roundEnv.getElementsAnnotatedWith(AutoFactory.class)) {
Optional<AutoFactoryDeclaration> declaration = declarationFactory.createIfValid(element);
if (declaration.isPresent()) {
TypeElement extendingType = declaration.get().extendingType();
List<ExecutableElement> supertypeMethods =
ElementFilter.methodsIn(elements.getAllMembers(extendingType));
for (ExecutableElement supertypeMethod : supertypeMethods) {
if (supertypeMethod.getModifiers().contains(Modifier.ABSTRACT)) {
ExecutableType methodType = Elements2.getExecutableElementAsMemberOf(
types, supertypeMethod, extendingType);
implemetationMethodDescriptors.add(new ImplemetationMethodDescriptor.Builder()
.name(supertypeMethod.getSimpleName().toString())
.returnType(getAnnotatedType(element).getQualifiedName().toString())
.publicMethod()
.passedParameters(Parameter.forParameterList(
supertypeMethod.getParameters(), methodType.getParameterTypes()))
.build());
}
}
for (TypeElement implementingType : declaration.get().implementingTypes()) {
List<ExecutableElement> interfaceMethods =
ElementFilter.methodsIn(elements.getAllMembers(implementingType));
for (ExecutableElement interfaceMethod : interfaceMethods) {
if (interfaceMethod.getModifiers().contains(Modifier.ABSTRACT)) {
ExecutableType methodType = Elements2.getExecutableElementAsMemberOf(
types, interfaceMethod, implementingType);
implemetationMethodDescriptors.add(new ImplemetationMethodDescriptor.Builder()
.name(interfaceMethod.getSimpleName().toString())
.returnType(getAnnotatedType(element).getQualifiedName().toString())
.publicMethod()
.passedParameters(Parameter.forParameterList(
interfaceMethod.getParameters(), methodType.getParameterTypes()))
.build());
}
}
}
}
ImmutableSet<FactoryMethodDescriptor> descriptors =
factoryDescriptorGenerator.generateDescriptor(element);
indexedMethods.putAll(
Multimaps.index(descriptors, new Function<FactoryMethodDescriptor, String>() {
@Override public String apply(FactoryMethodDescriptor descriptor) {
return descriptor.factoryName();
}
}));
}
for (Entry<String, Collection<FactoryMethodDescriptor>> entry
: indexedMethods.build().asMap().entrySet()) {
ImmutableSet.Builder<String> extending = ImmutableSet.builder();
ImmutableSortedSet.Builder<String> implementing = ImmutableSortedSet.naturalOrder();
boolean publicType = false;
for (FactoryMethodDescriptor methodDescriptor : entry.getValue()) {
extending.add(methodDescriptor.declaration().extendingType().getQualifiedName().toString());
for (TypeElement implementingType : methodDescriptor.declaration().implementingTypes()) {
implementing.add(implementingType.getQualifiedName().toString());
}
publicType |= methodDescriptor.publicMethod();
}
try {
factoryWriter.writeFactory(
new FactoryDescriptor(
entry.getKey(),
Iterables.getOnlyElement(extending.build()),
implementing.build(),
publicType,
ImmutableSet.copyOf(entry.getValue()),
// TODO(gak): this needs to be indexed too
implemetationMethodDescriptors.build()));
} catch (IOException e) {
messager.printMessage(Kind.ERROR, "failed");
}
}
}
private TypeElement getAnnotatedType(Element element) {
List<TypeElement> types = ImmutableList.of();
while (types.isEmpty()) {
types = ElementFilter.typesIn(Arrays.asList(element));
element = element.getEnclosingElement();
}
return Iterables.getOnlyElement(types);
}
@Override
public Set<String> getSupportedAnnotationTypes() {
return ImmutableSet.of(AutoFactory.class.getName(), Provided.class.getName());
}
@Override
public SourceVersion getSupportedSourceVersion() {
return SourceVersion.latestSupported();
}
}