| /* |
| * Copyright 2020 Google LLC |
| * |
| * 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.value.extension.serializable.serializer.impl; |
| |
| import com.google.auto.common.MoreTypes; |
| import com.google.auto.service.AutoService; |
| import com.google.auto.value.extension.serializable.serializer.interfaces.Serializer; |
| import com.google.auto.value.extension.serializable.serializer.interfaces.SerializerExtension; |
| import com.google.auto.value.extension.serializable.serializer.interfaces.SerializerFactory; |
| import com.google.auto.value.extension.serializable.serializer.runtime.FunctionWithExceptions; |
| import com.google.common.collect.ImmutableList; |
| import com.squareup.javapoet.CodeBlock; |
| import java.util.Optional; |
| import javax.annotation.processing.ProcessingEnvironment; |
| import javax.lang.model.element.TypeElement; |
| import javax.lang.model.type.TypeKind; |
| import javax.lang.model.type.TypeMirror; |
| |
| /** |
| * A {@link SerializerExtension} that deserializes objects inside an {@link ImmutableList}. |
| * |
| * <p>Enables unserializable objects inside an ImmutableList to be serializable. |
| */ |
| @AutoService(SerializerExtension.class) |
| public final class ImmutableListSerializerExtension implements SerializerExtension { |
| |
| public ImmutableListSerializerExtension() {} |
| |
| @Override |
| public Optional<Serializer> getSerializer( |
| TypeMirror typeMirror, SerializerFactory factory, ProcessingEnvironment processingEnv) { |
| if (!isImmutableList(typeMirror)) { |
| return Optional.empty(); |
| } |
| |
| // Extract the T of ImmutableList<T>. |
| TypeMirror containedType = getContainedType(typeMirror); |
| Serializer containedTypeSerializer = factory.getSerializer(containedType); |
| |
| // We don't need this serializer if the T of ImmutableList<T> is serializable. |
| if (containedTypeSerializer.isIdentity()) { |
| return Optional.empty(); |
| } |
| |
| return Optional.of(new ImmutableListSerializer(containedTypeSerializer, processingEnv)); |
| } |
| |
| private static class ImmutableListSerializer implements Serializer { |
| |
| private final Serializer containedTypeSerializer; |
| private final ProcessingEnvironment processingEnv; |
| |
| ImmutableListSerializer( |
| Serializer containedTypeSerializer, ProcessingEnvironment processingEnv) { |
| this.containedTypeSerializer = containedTypeSerializer; |
| this.processingEnv = processingEnv; |
| } |
| |
| @Override |
| public TypeMirror proxyFieldType() { |
| TypeElement immutableListTypeElement = |
| processingEnv.getElementUtils().getTypeElement(ImmutableList.class.getCanonicalName()); |
| TypeMirror containedProxyType = containedTypeSerializer.proxyFieldType(); |
| return processingEnv |
| .getTypeUtils() |
| .getDeclaredType(immutableListTypeElement, containedProxyType); |
| } |
| |
| @Override |
| public CodeBlock toProxy(CodeBlock expression) { |
| CodeBlock element = CodeBlock.of("value$$"); |
| return CodeBlock.of( |
| "$L.stream().map($T.wrapper($L -> $L)).collect($T.toImmutableList())", |
| expression, |
| FunctionWithExceptions.class, |
| element, |
| containedTypeSerializer.toProxy(element), |
| ImmutableList.class); |
| } |
| |
| @Override |
| public CodeBlock fromProxy(CodeBlock expression) { |
| CodeBlock element = CodeBlock.of("value$$"); |
| return CodeBlock.of( |
| "$L.stream().map($T.wrapper($L -> $L)).collect($T.toImmutableList())", |
| expression, |
| FunctionWithExceptions.class, |
| element, |
| containedTypeSerializer.fromProxy(element), |
| ImmutableList.class); |
| } |
| } |
| |
| private static boolean isImmutableList(TypeMirror type) { |
| if (type.getKind() != TypeKind.DECLARED) { |
| return false; |
| } |
| |
| return MoreTypes.asTypeElement(type) |
| .getQualifiedName() |
| .contentEquals("com.google.common.collect.ImmutableList"); |
| } |
| |
| private static TypeMirror getContainedType(TypeMirror type) { |
| return MoreTypes.asDeclared(type).getTypeArguments().get(0); |
| } |
| } |