589 lines
29 KiB
Java
589 lines
29 KiB
Java
package io.gitlab.jfronny.gson.compile.processor;
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import com.squareup.javapoet.*;
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import io.gitlab.jfronny.commons.StringFormatter;
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import io.gitlab.jfronny.gson.compile.annotations.GSerializable;
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import io.gitlab.jfronny.gson.compile.processor.util.AbstractProcessor2;
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import io.gitlab.jfronny.gson.compile.processor.util.SupportedAnnotationTypes2;
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import io.gitlab.jfronny.gson.compile.processor.util.valueprocessor.*;
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import io.gitlab.jfronny.gson.compile.processor.util.valueprocessor.Properties;
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import org.jetbrains.annotations.Nullable;
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import javax.annotation.processing.*;
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import javax.lang.model.SourceVersion;
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import javax.lang.model.element.*;
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import javax.lang.model.type.*;
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import javax.lang.model.util.*;
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import javax.tools.Diagnostic;
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import java.io.*;
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import java.lang.reflect.ParameterizedType;
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import java.util.*;
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import java.util.stream.Collectors;
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//TODO support for records
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@SupportedSourceVersion(SourceVersion.RELEASE_17)
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@SupportedAnnotationTypes2({GSerializable.class})
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public class GsonCompileProcessor extends AbstractProcessor2 {
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private Messager message;
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private Types typeUtils;
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private Filer filer;
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private Set<ClassName> seen;
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private ValueCreator valueCreator;
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private Elements elements;
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@Override
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public synchronized void init(ProcessingEnvironment processingEnv) {
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super.init(processingEnv);
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message = processingEnv.getMessager();
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filer = processingEnv.getFiler();
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typeUtils = processingEnv.getTypeUtils();
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elements = processingEnv.getElementUtils();
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seen = new LinkedHashSet<>();
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valueCreator = new ValueCreator(processingEnv);
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}
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@Override
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public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnvironment) {
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Set<ToProcess> toProcesses = new LinkedHashSet<>();
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for (TypeElement annotation : annotations) {
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for (Element element : roundEnvironment.getElementsAnnotatedWith(annotation)) {
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for (AnnotationMirror mirror : element.getAnnotationMirrors()) {
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if (mirror.getAnnotationType().toString().equals(GSerializable.class.getCanonicalName())) {
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var bld = new Object() {
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TypeMirror with = null;
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Boolean generateAdapter = null;
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};
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elements.getElementValuesWithDefaults(mirror).forEach((executableElement, value) -> {
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String name = executableElement.getSimpleName().toString();
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switch (name) {
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case "with" -> {
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if (bld.with != null) throw new IllegalArgumentException("Duplicate annotation parameter: with");
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bld.with = (TypeMirror) value.getValue();
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}
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case "generateAdapter" -> {
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if (bld.generateAdapter != null) throw new IllegalArgumentException("Duplicate annotation parameter: generateAdapter");
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bld.generateAdapter = (Boolean) value.getValue();
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}
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default -> throw new IllegalArgumentException("Unexpected annotation parameter: " + name);
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}
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});
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if (bld.with == null) throw new IllegalArgumentException("Missing annotation parameter: with");
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if (bld.generateAdapter == null) throw new IllegalArgumentException("Missing annotation parameter: generateAdapter");
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if (bld.with.toString().equals("void")) bld.with = null;
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if (bld.with != null && bld.generateAdapter) throw new IllegalArgumentException("Adapter for " + element + " already exists, not generating another!");
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toProcesses.add(new ToProcess((TypeElement) element, bld.with, bld.generateAdapter));
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}
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}
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}
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}
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for (ToProcess toProcess : toProcesses) {
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try {
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process(toProcess.element, toProcess.adapter, toProcess.generateAdapter);
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} catch (IOException | ElementException e) {
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message.printMessage(Diagnostic.Kind.ERROR, "GsonCompile threw an exception: " + StringFormatter.toString(e), toProcess.element);
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}
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}
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return false;
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}
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record ToProcess(TypeElement element, @Nullable TypeMirror adapter, boolean generateAdapter) {}
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private void process(TypeElement classElement, @Nullable TypeMirror adapter, boolean generateAdapter) throws IOException, ElementException {
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ClassName className = ClassName.get(classElement);
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if (!seen.add(className)) return; // Don't process the same class more than once
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ClassName generatedClassName = ClassName.get(className.packageName(), Const.PREFIX + String.join("_", className.simpleNames()));
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TypeName classType = TypeName.get(classElement.asType());
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List<TypeVariableName> typeVariables = new ArrayList<>();
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if (classType instanceof ParameterizedTypeName type) {
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for (TypeName argument : type.typeArguments) {
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typeVariables.add(TypeVariableName.get(argument.toString()));
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}
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}
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TypeSpec.Builder spec = TypeSpec.classBuilder(generatedClassName.simpleName())
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.addOriginatingElement(classElement)
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.addTypeVariables(typeVariables)
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.addModifiers(Modifier.PUBLIC);
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if (adapter != null) {
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generateDelegateToAdapter(spec, classType, adapter);
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} else {
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if (generateAdapter) {
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generateDelegatingAdapter(spec, classType, generatedClassName);
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}
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generateSerialisation(spec, classType, classElement, typeVariables);
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}
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generateAuxiliary(spec, classType);
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//TODO register adapter as available and use in generated adapters
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JavaFile javaFile = JavaFile.builder(className.packageName(), spec.build())
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.skipJavaLangImports(true)
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.indent(" ")
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.build();
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javaFile.writeTo(filer);
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message.printMessage(Diagnostic.Kind.NOTE, "Processed " + className);
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}
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private static void generateDelegatingAdapter(TypeSpec.Builder spec, TypeName classType, ClassName generatedClassName) {
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spec.addType(
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TypeSpec.classBuilder("Adapter")
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.superclass(ParameterizedTypeName.get(Const.TYPE_ADAPTER, classType))
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.addMethod(MethodSpec.methodBuilder("write")
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.addAnnotation(Override.class)
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.addModifiers(Modifier.PUBLIC)
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.addParameter(Const.GSON_WRITER, "writer")
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.addParameter(classType, "value")
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.addException(IOException.class)
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.addCode(generatedClassName.simpleName() + ".write(writer, value);")
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.build())
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.addMethod(MethodSpec.methodBuilder("read")
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.addAnnotation(Override.class)
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.addModifiers(Modifier.PUBLIC)
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.addParameter(Const.GSON_READER, "reader")
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.addException(IOException.class)
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.returns(classType)
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.addCode("return " + generatedClassName.simpleName() + ".read(reader);")
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.build())
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.build()
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);
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}
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private static void generateDelegateToAdapter(TypeSpec.Builder spec, TypeName classType, TypeMirror adapter) {
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TypeName adapterType = TypeName.get(adapter);
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spec.addField(
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FieldSpec.builder(adapterType, "ADAPTER", Modifier.PUBLIC, Modifier.STATIC, Modifier.FINAL)
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.initializer("new $T()", adapterType)
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.build()
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);
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spec.addMethod(
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MethodSpec.methodBuilder(Const.READ)
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(Const.GSON_READER, "reader")
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.addException(IOException.class)
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.returns(classType)
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.addCode("return ADAPTER.read(reader);")
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.build()
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);
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spec.addMethod(
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MethodSpec.methodBuilder(Const.READ)
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(Const.GSON_READER, "writer")
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.addParameter(classType, "value")
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.addException(IOException.class)
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.returns(classType)
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.addCode("ADAPTER.write(reader, value);")
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.build()
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);
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}
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private static void generateAuxiliary(TypeSpec.Builder spec, TypeName classType) {
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spec.addMethod(
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MethodSpec.methodBuilder(Const.READ)
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(TypeName.get(Reader.class), "in")
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.addException(IOException.class)
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.returns(classType)
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.addCode("""
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try ($1T reader = new $1T(in)) {
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return read(reader);
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}""", Const.GSON_READER)
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.build()
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);
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spec.addMethod(
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MethodSpec.methodBuilder(Const.READ)
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(TypeName.get(String.class), "json")
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.addException(IOException.class)
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.returns(classType)
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.addCode("""
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try ($1T reader = new $1T(json)) {
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return read(reader);
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}""", StringReader.class)
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.build()
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);
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spec.addMethod(
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MethodSpec.methodBuilder(Const.READ)
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(Const.GSON_ELEMENT, "tree")
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.addException(IOException.class)
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.returns(classType)
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.addCode("""
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try ($1T reader = new $1T(tree)) {
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return read(reader);
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}""", Const.GSON_TREE_READER)
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.build()
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);
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spec.addMethod(
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MethodSpec.methodBuilder(Const.WRITE)
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(Writer.class, "out")
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.addParameter(classType, "value")
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.addException(IOException.class)
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.addCode("""
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try ($1T writer = new $1T(out)) {
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write(writer, value);
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}""", Const.GSON_WRITER)
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.build()
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);
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spec.addMethod(
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MethodSpec.methodBuilder("toJson")
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(classType, "value")
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.addException(IOException.class)
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.returns(String.class)
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.addCode("""
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try ($1T writer = new $1T()) {
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write(writer, value);
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return writer.toString();
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}""", StringWriter.class)
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.build()
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);
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spec.addMethod(
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MethodSpec.methodBuilder("toJsonTree")
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(classType, "value")
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.addException(IOException.class)
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.returns(Const.GSON_ELEMENT)
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.addCode("""
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try ($1T writer = new $1T()) {
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write(writer, value);
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return writer.get();
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}""", Const.GSON_TREE_WRITER)
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.build()
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);
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}
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private void generateSerialisation(TypeSpec.Builder spec, TypeName classType, TypeElement classElement, List<TypeVariableName> typeVariables) throws ElementException {
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Value value = valueCreator.from(classElement);
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ConstructionSource constructionSource = value.getConstructionSource();
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Properties properties = value.getProperties();
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// public static void write(JsonWriter writer, T value) throws IOException
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{
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CodeBlock.Builder code = CodeBlock.builder();
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code.beginControlFlow("if (value == null)")
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.addStatement("writer.nullValue()")
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.addStatement("return")
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.endControlFlow();
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code.addStatement("writer.beginObject()");
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for (Property.Field field : properties.fields) {
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code.addStatement("writer.name($S)", getSerializedName(field));
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generateWrite(field, spec, code, "writer", "value.$N", typeVariables);
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}
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for (Property.Getter getter : properties.getters) {
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code.addStatement("writer.name($S)", getSerializedName(getter));
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generateWrite(getter, spec, code, "writer", "value.$N()", typeVariables);
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}
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code.addStatement("writer.endObject()");
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spec.addMethod(MethodSpec.methodBuilder("write")
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.addParameter(Const.GSON_WRITER, "writer")
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.addParameter(classType, "value")
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.addException(IOException.class)
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.addCode(code.build())
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.build());
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}
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// public static T read(JsonReader reader) throws IOException
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{
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CodeBlock.Builder code = CodeBlock.builder();
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code.beginControlFlow("if (reader.peek() == $T.NULL)", Const.GSON_TOKEN)
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.addStatement("reader.nextNull()")
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.addStatement("return null")
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.endControlFlow();
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boolean isEmpty = true;
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for (Property<?> param : properties.names) {
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isEmpty = false;
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code.addStatement("$T $L = $L", param.getType(), Const.ARG_PREFIX + param.getName(), getDefaultValue(param.getType()));
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}
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if (isEmpty) {
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code.addStatement("reader.skipValue()");
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} else {
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code.addStatement("reader.beginObject()")
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.beginControlFlow("while (reader.hasNext())")
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.beginControlFlow("switch (reader.nextName())");
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for (Property<?> param : properties.names) {
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String read = generateRead(param, spec, "reader", typeVariables);
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if (param.getType().getKind().isPrimitive()) {
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code.add("case $S -> ", getSerializedName(param));
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code.addStatement("$L = $L", Const.ARG_PREFIX + param.getName(), read);
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} else {
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code.beginControlFlow("case $S ->", getSerializedName(param))
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.beginControlFlow("if (reader.peek() == $T.NULL)", Const.GSON_TOKEN)
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.addStatement("reader.nextNull()")
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.addStatement("$L = null", Const.ARG_PREFIX + param.getName())
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.endControlFlow("else $L = $L", Const.ARG_PREFIX + param.getName(), read)
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.endControlFlow();
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}
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}
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code.add("default -> ")
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.addStatement("reader.skipValue()");
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code.endControlFlow()
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.endControlFlow()
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.addStatement("reader.endObject()");
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}
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ClassName creatorName = ClassName.get((TypeElement) constructionSource.getConstructionElement().getEnclosingElement());
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if (constructionSource instanceof ConstructionSource.Builder builder) {
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String args = properties.constructorParams.stream().map(s -> Const.ARG_PREFIX + s.getName()).collect(Collectors.joining(", "));
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if (constructionSource.isConstructor()) {
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code.add("return new $T($L)", builder.getBuilderClass(), args);
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} else {
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code.add("return $T.$L($L)", creatorName, classElement.getSimpleName(), args);
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}
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code.add("\n").indent();
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for (Property.BuilderParam param : properties.builderParams) {
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code.add(".$L($L)\n", param.getCallableName(), Const.ARG_PREFIX + param.getName());
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}
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code.add(".$L();\n", builder.getBuildMethod().getSimpleName()).unindent();
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} else {
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String args = properties.params.stream().map(s -> Const.ARG_PREFIX + s.getName()).collect(Collectors.joining(", "));
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if (constructionSource.isConstructor()) {
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code.addStatement("return new $T($L)", classType, args);
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} else {
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code.addStatement("return $T.$L($L)", creatorName, constructionSource.getConstructionElement().getSimpleName(), args);
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}
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}
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spec.addMethod(MethodSpec.methodBuilder("read")
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.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
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.returns(classType)
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.addParameter(Const.GSON_READER, "reader")
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.addException(IOException.class)
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.addCode(code.build())
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.build());
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}
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}
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private void generateWrite(Property<?> prop, TypeSpec.Builder klazz, CodeBlock.Builder code, String writer, String get, List<TypeVariableName> typeVariables) {
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TypeMirror unboxed = unbox(prop.getType());
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if (unbox(prop.getType()).getKind().isPrimitive() || prop.getType().toString().equals(String.class.getCanonicalName())) {
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if (prop.getType().equals(unboxed)) {
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code.addStatement("$L.value(" + get + ")", writer, prop.getCallableName());
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} else {
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String pName = Const.ARG_PREFIX + prop.getName();
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code.addStatement("$T $L = " + get, prop.getType(), pName, prop.getCallableName())
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.beginControlFlow("if ($L == null)", pName)
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.addStatement("$L.nullValue()", writer)
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.endControlFlow("else $L.value($L)", writer, pName);
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}
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return;
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}
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//TODO handle lists, sets, arrays, other common types (-> https://github.com/bluelinelabs/LoganSquare/blob/development/docs/TypeConverters.md)
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//TODO support comment annotations
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code.addStatement(getAdapter(prop, klazz, typeVariables) + ".write(" + writer + ", " + get + ")", prop.getCallableName());
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}
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private String generateRead(Property<?> prop, TypeSpec.Builder klazz, String reader, List<TypeVariableName> typeVariables) {
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TypeMirror unboxed = unbox(prop.getType());
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if (unboxed.getKind().isPrimitive()) {
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return switch (unboxed.getKind()) {
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case BOOLEAN -> reader + ".nextBoolean()";
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case BYTE -> "(byte) " + reader + ".nextInt()";
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case SHORT -> "(short) " + reader + ".nextInt()";
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case INT -> reader + ".nextInt()";
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case LONG -> reader + ".nextLong()";
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case CHAR -> "(char) " + reader + ".nextInt()";
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case FLOAT -> "(float) " + reader + ".nextDouble()";
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case DOUBLE -> reader + ".nextDouble()";
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default -> throw new IllegalArgumentException("Unsupported primitive: " + unboxed.getKind());
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};
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}
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if (prop.getType().toString().equals(String.class.getCanonicalName())) {
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return reader + ".nextString()";
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}
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//TODO handle lists, sets, arrays, other common types (-> https://github.com/bluelinelabs/LoganSquare/blob/development/docs/TypeConverters.md)
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return getAdapter(prop, klazz, typeVariables) + ".read(" + reader + ")";
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}
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private String getAdapter(Property<?> prop, TypeSpec.Builder klazz, List<TypeVariableName> typeVariables) {
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String typeAdapterName = Const.ADAPTER_PREFIX + prop.getName();
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for (FieldSpec spec : klazz.fieldSpecs) {
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if (spec.name.equals(typeAdapterName)) return typeAdapterName;
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}
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DeclaredType typeAdapterClass = findTypeAdapterClass(prop.getAnnotations());
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if (typeAdapterClass != null) {
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if (isInstance(typeAdapterClass, Const.TYPE_ADAPTER.toString())) {
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klazz.addField(
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FieldSpec.builder(TypeName.get(typeAdapterClass), typeAdapterName)
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.addModifiers(Modifier.PRIVATE, Modifier.STATIC, Modifier.FINAL)
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.initializer("new $T()", typeAdapterClass)
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.build()
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);
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} else if (isInstance(typeAdapterClass, Const.TYPE_ADAPTER_FACTORY.toString())) {
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TypeName typeAdapterType = ParameterizedTypeName.get(Const.TYPE_ADAPTER, TypeName.get(prop.getType()).box());
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CodeBlock.Builder block = CodeBlock.builder();
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block.add("new $T().create($T.HOLDER.getGson(), ", typeAdapterClass, Const.CCORE);
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appendFieldTypeToken(block, prop, typeVariables, false);
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block.add(")");
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klazz.addField(
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FieldSpec.builder(typeAdapterType, typeAdapterName)
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.addModifiers(Modifier.PRIVATE, Modifier.STATIC, Modifier.FINAL)
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.initializer(block.build())
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.build()
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);
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} else message.printMessage(Diagnostic.Kind.ERROR, "@JsonAdapter value must by TypeAdapter or TypeAdapterFactory reference.", prop.getElement());
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} else {
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//TODO handle known custom type adapters and return proper static class
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TypeName typeAdapterType = ParameterizedTypeName.get(Const.TYPE_ADAPTER, TypeName.get(prop.getType()).box());
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CodeBlock.Builder block = CodeBlock.builder();
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block.add("$T.HOLDER.getGson().getAdapter(", Const.CCORE);
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appendFieldTypeToken(block, prop, typeVariables, true);
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block.add(")");
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klazz.addField(
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FieldSpec.builder(typeAdapterType, typeAdapterName)
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.addModifiers(Modifier.PRIVATE, Modifier.STATIC, Modifier.FINAL)
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.initializer(block.build())
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.build()
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|
);
|
|
}
|
|
return typeAdapterName;
|
|
}
|
|
|
|
private void appendFieldTypeToken(CodeBlock.Builder block, Property<?> property, List<TypeVariableName> typeVariables, boolean allowClassType) {
|
|
TypeMirror type = property.getType();
|
|
TypeName typeName = TypeName.get(type);
|
|
|
|
if (isComplexType(type)) {
|
|
TypeName typeTokenType = ParameterizedTypeName.get(Const.TYPE_TOKEN, typeName);
|
|
List<? extends TypeMirror> typeParams = getGenericTypes(type);
|
|
if (typeParams.isEmpty()) {
|
|
block.add("new $T() {}", typeTokenType);
|
|
} else {
|
|
block.add("($T) $T.getParameterized($T.class, ", typeTokenType, Const.TYPE_TOKEN, typeUtils.erasure(type));
|
|
for (Iterator<? extends TypeMirror> iterator = typeParams.iterator(); iterator.hasNext(); ) {
|
|
TypeMirror typeParam = iterator.next();
|
|
int typeIndex = typeVariables.indexOf(TypeVariableName.get(typeParam.toString()));
|
|
block.add("(($T)typeToken.getType()).getActualTypeArguments()[$L]", ParameterizedType.class, typeIndex);
|
|
if (iterator.hasNext()) {
|
|
block.add(", ");
|
|
}
|
|
}
|
|
block.add(")");
|
|
}
|
|
} else if (isGenericType(type)) {
|
|
TypeName typeTokenType = ParameterizedTypeName.get(Const.TYPE_TOKEN, typeName);
|
|
int typeIndex = typeVariables.indexOf(TypeVariableName.get(property.getType().toString()));
|
|
block.add("($T) $T.get((($T)typeToken.getType()).getActualTypeArguments()[$L])",
|
|
typeTokenType, Const.TYPE_TOKEN, ParameterizedType.class, typeIndex);
|
|
} else {
|
|
if (allowClassType) {
|
|
block.add("$T.class", typeName);
|
|
} else {
|
|
block.add("TypeToken.get($T.class)", typeName);
|
|
}
|
|
}
|
|
}
|
|
|
|
private boolean isComplexType(TypeMirror type) {
|
|
Element element = typeUtils.asElement(type);
|
|
if (!(element instanceof TypeElement typeElement)) return false;
|
|
return !typeElement.getTypeParameters().isEmpty();
|
|
}
|
|
|
|
private boolean isGenericType(TypeMirror type) {
|
|
return type.getKind() == TypeKind.TYPEVAR;
|
|
}
|
|
|
|
private List<? extends TypeMirror> getGenericTypes(TypeMirror type) {
|
|
DeclaredType declaredType = asDeclaredType(type);
|
|
if (declaredType == null) {
|
|
return Collections.emptyList();
|
|
}
|
|
ArrayList<TypeMirror> result = new ArrayList<>();
|
|
for (TypeMirror argType : declaredType.getTypeArguments()) {
|
|
if (argType.getKind() == TypeKind.TYPEVAR) {
|
|
result.add(argType);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private static String getDefaultValue(TypeMirror type) {
|
|
switch (type.getKind()) {
|
|
case BYTE:
|
|
case SHORT:
|
|
case INT:
|
|
case LONG:
|
|
case FLOAT:
|
|
case CHAR:
|
|
case DOUBLE:
|
|
return "0";
|
|
case BOOLEAN:
|
|
return "false";
|
|
default:
|
|
return "null";
|
|
}
|
|
}
|
|
|
|
private TypeMirror unbox(TypeMirror type) {
|
|
try {
|
|
return typeUtils.unboxedType(type);
|
|
} catch (IllegalArgumentException e) {
|
|
return type;
|
|
}
|
|
}
|
|
|
|
private static String getSerializedName(Property<?> property) {
|
|
for (AnnotationMirror annotationMirror : property.getAnnotations()) {
|
|
if (annotationMirror.getAnnotationType().asElement().toString().equals("com.google.gson.annotations.SerializedName")) {
|
|
return (String) annotationMirror.getElementValues().values().iterator().next().getValue();
|
|
}
|
|
}
|
|
return property.getName();
|
|
}
|
|
|
|
private DeclaredType findTypeAdapterClass(List<? extends AnnotationMirror> annotations) {
|
|
for (AnnotationMirror annotation : annotations) {
|
|
String typeName = annotation.getAnnotationType().toString();
|
|
if (typeName.equals(Const.JSON_ADAPTER.toString())) {
|
|
Map<? extends ExecutableElement, ? extends AnnotationValue> elements = annotation.getElementValues();
|
|
if (!elements.isEmpty()) {
|
|
AnnotationValue value = elements.values().iterator().next();
|
|
return (DeclaredType) value.getValue();
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
private boolean isInstance(DeclaredType type, String parentClassName) {
|
|
if (type == null) return false;
|
|
TypeElement element = (TypeElement) type.asElement();
|
|
for (TypeMirror interfaceType : element.getInterfaces()) {
|
|
if (typeUtils.erasure(interfaceType).toString().equals(parentClassName)) return true;
|
|
}
|
|
TypeMirror superclassType = element.getSuperclass();
|
|
if (superclassType != null) {
|
|
if (typeUtils.erasure(superclassType).toString().equals(parentClassName)) {
|
|
return true;
|
|
} else {
|
|
return isInstance(asDeclaredType(superclassType), parentClassName);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
private static DeclaredType asDeclaredType(TypeMirror type) {
|
|
return type.accept(new SimpleTypeVisitor14<>() {
|
|
@Override
|
|
public DeclaredType visitDeclared(DeclaredType t, Object o) {
|
|
return t;
|
|
}
|
|
}, null);
|
|
}
|
|
}
|