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Add builders for messages with optional fields
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103 changes: 103 additions & 0 deletions
103
generator/src/main/java/org/sudu/protogen/generator/message/MessageBuilderGenerator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package org.sudu.protogen.generator.message; | ||
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| import com.squareup.javapoet.*; | ||
| import org.jetbrains.annotations.NotNull; | ||
| import org.sudu.protogen.descriptors.Message; | ||
| import org.sudu.protogen.generator.DescriptorGenerator; | ||
| import org.sudu.protogen.generator.GenerationContext; | ||
| import org.sudu.protogen.generator.field.FieldGenerationHelper; | ||
| import org.sudu.protogen.generator.field.FieldProcessingResult; | ||
| import org.sudu.protogen.utils.Name; | ||
| import org.sudu.protogen.utils.Poem; | ||
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| import javax.lang.model.element.Modifier; | ||
| import java.util.List; | ||
| import java.util.function.Predicate; | ||
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| public class MessageBuilderGenerator implements DescriptorGenerator<Message, TypeSpec> { | ||
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| private final GenerationContext context; | ||
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| public MessageBuilderGenerator(@NotNull GenerationContext context) { | ||
| this.context = context; | ||
| } | ||
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| @Override | ||
| public TypeSpec generate(Message descriptor) { | ||
| TypeSpec.Builder builder = TypeSpec.classBuilder(getBuilderName(descriptor)) | ||
| .addModifiers(Modifier.PUBLIC, Modifier.STATIC); | ||
| addFields(descriptor, builder); | ||
| addConstructor(descriptor, builder); | ||
| addSetters(descriptor, builder); | ||
| addBuildMethod(descriptor, builder); | ||
| return builder.build(); | ||
| } | ||
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| private void addBuildMethod(Message descriptor, TypeSpec.Builder builder) { | ||
| ClassName messageType = descriptor.getDomainTypeName(context.configuration().namingManager()); | ||
| MethodSpec buildMethod = MethodSpec.methodBuilder("build") | ||
| .addModifiers(Modifier.PUBLIC) | ||
| .addAnnotation(NotNull.class) | ||
| .returns(messageType) | ||
| .addStatement("return new $T($L)", messageType, | ||
| Poem.separatedSequence( | ||
| FieldGenerationHelper.processAllFields(descriptor, context) | ||
| .map(FieldProcessingResult::field) | ||
| .map(field -> CodeBlock.of("$N", field)) | ||
| .toList(), | ||
| ", " | ||
| )) | ||
| .build(); | ||
| builder.addMethod(buildMethod); | ||
| } | ||
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| private void addSetters(Message descriptor, TypeSpec.Builder builder) { | ||
| String builderName = getBuilderName(descriptor); | ||
| FieldGenerationHelper.processAllFields(descriptor, context) | ||
| .filter(FieldProcessingResult::isNullable) | ||
| .map(FieldProcessingResult::field) | ||
| .map(field -> setterForField(field, builderName)) | ||
| .forEach(builder::addMethod); | ||
| } | ||
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| @NotNull | ||
| private MethodSpec setterForField(FieldSpec fieldSpec, String builderName) { | ||
| return MethodSpec.methodBuilder("set" + Name.toCamelCase(fieldSpec.name)) | ||
| .addModifiers(Modifier.PUBLIC) | ||
| .returns(ClassName.get("",builderName)) | ||
| .addStatement("this.$N = $N", fieldSpec, fieldSpec) | ||
| .addStatement("return this") | ||
| .build(); | ||
| } | ||
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| private void addConstructor(Message descriptor, TypeSpec.Builder builder) { | ||
| List<FieldSpec> nonNullFields = FieldGenerationHelper.processAllFields(descriptor, context) | ||
| .filter(Predicate.not(FieldProcessingResult::isNullable)) | ||
| .map(FieldProcessingResult::field) | ||
| .map(field -> field.toBuilder().clearAnnotations().build()) | ||
| .toList(); | ||
| MethodSpec constructor = MethodSpec.constructorBuilder().addParameters( | ||
| nonNullFields.stream() | ||
| .map(Poem::fieldToParameter) | ||
| .toList() | ||
| ).addModifiers(Modifier.PRIVATE).addCode( | ||
| nonNullFields.stream() | ||
| .map(field -> CodeBlock.of("this.$N = $N;", field, field)) | ||
| .collect(Poem.joinCodeBlocks("\n")) | ||
| ).build(); | ||
| builder.addMethod(constructor); | ||
| } | ||
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| private void addFields(Message descriptor, TypeSpec.Builder builder) { | ||
| FieldGenerationHelper.processAllFields(descriptor, context) | ||
| .map(FieldProcessingResult::field) | ||
| .map(field -> field.toBuilder().clearAnnotations().addModifiers(Modifier.PRIVATE).build()) | ||
| .forEach(builder::addField); | ||
| } | ||
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| @NotNull | ||
| private String getBuilderName(Message descriptor) { | ||
| return descriptor.getDomainTypeName(context.configuration().namingManager()).simpleName() + "Builder"; | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -70,4 +70,5 @@ message GrpcWithOneofs { | |
| int32 a = 2; | ||
| int32 b= 3; | ||
| } | ||
| option (.protogen.builder_for_nullable) = false; | ||
| } | ||