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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.skyframe.serialization.autocodec;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.skyframe.serialization.DeserializationContext;
import com.google.devtools.build.lib.skyframe.serialization.ObjectCodec;
import com.google.devtools.build.lib.skyframe.serialization.SerializationContext;
import com.google.devtools.build.lib.skyframe.serialization.SerializationException;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.ParameterizedTypeName;
import com.squareup.javapoet.TypeName;
import com.squareup.javapoet.TypeSpec;
import java.io.IOException;
import java.util.stream.Collectors;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
/** Static utilities for AutoCodec processors. */
class AutoCodecUtil {
// Synthesized classes will have `_AutoCodec` suffix added.
public static final String GENERATED_CLASS_NAME_SUFFIX = "AutoCodec";
static final Class<AutoCodec> ANNOTATION = AutoCodec.class;
/**
* Initializes a builder for a class of the appropriate type.
*
* @param encodedType type being serialized
*/
static TypeSpec.Builder initializeCodecClassBuilder(TypeElement encodedType) {
TypeSpec.Builder builder = TypeSpec.classBuilder(getCodecName(encodedType));
return builder.addSuperinterface(
ParameterizedTypeName.get(
ClassName.get(ObjectCodec.class), TypeName.get(encodedType.asType())));
}
static MethodSpec.Builder initializeGetEncodedClassMethod(TypeElement encodedType) {
return MethodSpec.methodBuilder("getEncodedClass")
.addModifiers(Modifier.PUBLIC)
.addAnnotation(Override.class)
.returns(
ParameterizedTypeName.get(
ClassName.get(Class.class), TypeName.get(encodedType.asType())));
}
/**
* Initializes the deserialize method.
*
* @param encodedType type being serialized
*/
static MethodSpec.Builder initializeSerializeMethodBuilder(TypeElement encodedType) {
MethodSpec.Builder builder =
MethodSpec.methodBuilder("serialize")
.addModifiers(Modifier.PUBLIC)
.returns(void.class)
.addAnnotation(Override.class)
.addException(SerializationException.class)
.addException(IOException.class);
return builder
.addParameter(SerializationContext.class, "context")
.addParameter(TypeName.get(encodedType.asType()), "input")
.addParameter(CodedOutputStream.class, "codedOut");
}
/**
* Initializes the deserialize method.
*
* @param encodedType type being serialized
*/
static MethodSpec.Builder initializeDeserializeMethodBuilder(TypeElement encodedType) {
MethodSpec.Builder builder =
MethodSpec.methodBuilder("deserialize")
.addModifiers(Modifier.PUBLIC)
.returns(TypeName.get(encodedType.asType()))
.addAnnotation(Override.class)
.addException(SerializationException.class)
.addException(IOException.class);
return builder
.addParameter(DeserializationContext.class, "context")
.addParameter(CodedInputStream.class, "codedIn");
}
/**
* Name of the generated codec class.
*
* <p>For {@code Foo.Bar} this is {@code Foo_Bar_AutoCodec}.
*/
private static String getCodecName(Element element) {
ImmutableList.Builder<String> classNamesBuilder = new ImmutableList.Builder<>();
classNamesBuilder.add(GENERATED_CLASS_NAME_SUFFIX);
do {
classNamesBuilder.add(element.getSimpleName().toString());
element = element.getEnclosingElement();
} while (element instanceof TypeElement);
return classNamesBuilder.build().reverse().stream().collect(Collectors.joining("_"));
}
}
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