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/*
* 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.ImmutableMap;
import com.squareup.javapoet.CodeBlock;
import java.util.Optional;
import java.util.function.Function;
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 ImmutableMap}.
*
* <p>Enables unserializable objects inside an ImmutableMap to be serializable.
*/
@AutoService(SerializerExtension.class)
public final class ImmutableMapSerializerExtension implements SerializerExtension {
public ImmutableMapSerializerExtension() {}
@Override
public Optional<Serializer> getSerializer(
TypeMirror typeMirror, SerializerFactory factory, ProcessingEnvironment processingEnv) {
if (!isImmutableMap(typeMirror)) {
return Optional.empty();
}
// Extract the K, V of ImmutableMap<K, V>.
TypeMirror keyType = getKeyType(typeMirror);
TypeMirror valueType = getValueType(typeMirror);
Serializer keyTypeSerializer = factory.getSerializer(keyType);
Serializer valueTypeSerializer = factory.getSerializer(valueType);
// We don't need this serializer if the K and V of ImmutableMap<K, V> are serializable.
if (keyTypeSerializer.isIdentity() && valueTypeSerializer.isIdentity()) {
return Optional.empty();
}
return Optional.of(
new ImmutableMapSerializer(
keyType, valueType, keyTypeSerializer, valueTypeSerializer, processingEnv));
}
private static class ImmutableMapSerializer implements Serializer {
private final TypeMirror keyType;
private final TypeMirror valueType;
private final TypeMirror keyProxyType;
private final TypeMirror valueProxyType;
private final Serializer keyTypeSerializer;
private final Serializer valueTypeSerializer;
private final ProcessingEnvironment processingEnv;
ImmutableMapSerializer(
TypeMirror keyType,
TypeMirror valueType,
Serializer keyTypeSerializer,
Serializer valueTypeSerializer,
ProcessingEnvironment processingEnv) {
this.keyType = keyType;
this.valueType = valueType;
this.keyProxyType = keyTypeSerializer.proxyFieldType();
this.valueProxyType = valueTypeSerializer.proxyFieldType();
this.keyTypeSerializer = keyTypeSerializer;
this.valueTypeSerializer = valueTypeSerializer;
this.processingEnv = processingEnv;
}
@Override
public TypeMirror proxyFieldType() {
TypeElement immutableMapTypeElement =
processingEnv.getElementUtils().getTypeElement(ImmutableMap.class.getCanonicalName());
return processingEnv
.getTypeUtils()
.getDeclaredType(immutableMapTypeElement, keyProxyType, valueProxyType);
}
@Override
public CodeBlock toProxy(CodeBlock expression) {
return CodeBlock.of(
"$L.entrySet().stream().collect($T.toImmutableMap($L, $L))",
expression,
ImmutableMap.class,
generateKeyMapFunction(keyType, keyProxyType, keyTypeSerializer::toProxy),
generateValueMapFunction(valueType, valueProxyType, valueTypeSerializer::toProxy));
}
@Override
public CodeBlock fromProxy(CodeBlock expression) {
return CodeBlock.of(
"$L.entrySet().stream().collect($T.toImmutableMap($L, $L))",
expression,
ImmutableMap.class,
generateKeyMapFunction(keyProxyType, keyType, keyTypeSerializer::fromProxy),
generateValueMapFunction(valueProxyType, valueType, valueTypeSerializer::fromProxy));
}
private static CodeBlock generateKeyMapFunction(
TypeMirror originalType,
TypeMirror transformedType,
Function<CodeBlock, CodeBlock> proxyMap) {
CodeBlock element = CodeBlock.of("element$$");
return CodeBlock.of(
"value$$ -> $T.<$T, $T>wrapper($L -> $L).apply(value$$.getKey())",
FunctionWithExceptions.class,
originalType,
transformedType,
element,
proxyMap.apply(element));
}
private static CodeBlock generateValueMapFunction(
TypeMirror originalType,
TypeMirror transformedType,
Function<CodeBlock, CodeBlock> proxyMap) {
CodeBlock element = CodeBlock.of("element$$");
return CodeBlock.of(
"value$$ -> $T.<$T, $T>wrapper($L -> $L).apply(value$$.getValue())",
FunctionWithExceptions.class,
originalType,
transformedType,
element,
proxyMap.apply(element));
}
}
private static boolean isImmutableMap(TypeMirror type) {
if (type.getKind() != TypeKind.DECLARED) {
return false;
}
return MoreTypes.asTypeElement(type)
.getQualifiedName()
.contentEquals("com.google.common.collect.ImmutableMap");
}
private static TypeMirror getKeyType(TypeMirror type) {
return MoreTypes.asDeclared(type).getTypeArguments().get(0);
}
private static TypeMirror getValueType(TypeMirror type) {
return MoreTypes.asDeclared(type).getTypeArguments().get(1);
}
}
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