Add annotation processor to generate converter for VKey (#566)

processor/build.gradle

@@ -0,0 +1,25 @@
+// Copyright 2020 The Nomulus 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.
+
+plugins {
+    id 'java-library'
+}
+
+dependencies {
+    def deps = rootProject.dependencyMap
+    compile deps['com.google.code.findbugs:jsr305']
+    compile deps['com.google.guava:guava']
+    compile deps['com.squareup:javapoet']
+    compile deps['javax.persistence:javax.persistence-api']
+}

processor/gradle/dependency-locks/annotationProcessor.lockfile

@@ -0,0 +1,24 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.github.kevinstern:software-and-algorithms:1.0
+com.github.stephenc.jcip:jcip-annotations:1.0-1
+com.google.auto:auto-common:0.10
+com.google.code.findbugs:jFormatString:3.0.0
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotation:2.3.3
+com.google.errorprone:error_prone_annotations:2.3.3
+com.google.errorprone:error_prone_check_api:2.3.3
+com.google.errorprone:error_prone_core:2.3.3
+com.google.errorprone:error_prone_type_annotations:2.3.3
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:27.0.1-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.1
+com.google.protobuf:protobuf-java:3.4.0
+com.googlecode.java-diff-utils:diffutils:1.3.0
+org.checkerframework:checker-qual:2.5.3
+org.checkerframework:dataflow:2.5.3
+org.checkerframework:javacutil:2.5.3
+org.codehaus.mojo:animal-sniffer-annotations:1.17
+org.pcollections:pcollections:2.1.2

processor/gradle/dependency-locks/apt.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.

processor/gradle/dependency-locks/archives.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.

processor/gradle/dependency-locks/buildscript-classpath.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.

processor/gradle/dependency-locks/checkstyle.lockfile

@@ -0,0 +1,18 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+antlr:antlr:2.7.7
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.2
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.1-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.puppycrawl.tools:checkstyle:8.27
+commons-beanutils:commons-beanutils:1.9.4
+commons-collections:commons-collections:3.2.2
+info.picocli:picocli:4.1.1
+net.sf.saxon:Saxon-HE:9.9.1-5
+org.antlr:antlr4-runtime:4.7.2
+org.checkerframework:checker-qual:2.8.1
+org.codehaus.mojo:animal-sniffer-annotations:1.18

processor/gradle/dependency-locks/compile.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/compileClasspath.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/compileOnly.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.

processor/gradle/dependency-locks/default.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/deploy_jar.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/errorprone.lockfile

@@ -0,0 +1,24 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.github.kevinstern:software-and-algorithms:1.0
+com.github.stephenc.jcip:jcip-annotations:1.0-1
+com.google.auto:auto-common:0.10
+com.google.code.findbugs:jFormatString:3.0.0
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotation:2.3.3
+com.google.errorprone:error_prone_annotations:2.3.3
+com.google.errorprone:error_prone_check_api:2.3.3
+com.google.errorprone:error_prone_core:2.3.3
+com.google.errorprone:error_prone_type_annotations:2.3.3
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:27.0.1-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.1
+com.google.protobuf:protobuf-java:3.4.0
+com.googlecode.java-diff-utils:diffutils:1.3.0
+org.checkerframework:checker-qual:2.5.3
+org.checkerframework:dataflow:2.5.3
+org.checkerframework:javacutil:2.5.3
+org.codehaus.mojo:animal-sniffer-annotations:1.17
+org.pcollections:pcollections:2.1.2

processor/gradle/dependency-locks/errorproneJavac.lockfile

@@ -0,0 +1,4 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.errorprone:javac:9+181-r4173-1

processor/gradle/dependency-locks/jacocoAgent.lockfile

@@ -0,0 +1,4 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+org.jacoco:org.jacoco.agent:0.8.5

processor/gradle/dependency-locks/jacocoAnt.lockfile

@@ -0,0 +1,11 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+org.jacoco:org.jacoco.agent:0.8.5
+org.jacoco:org.jacoco.ant:0.8.5
+org.jacoco:org.jacoco.core:0.8.5
+org.jacoco:org.jacoco.report:0.8.5
+org.ow2.asm:asm-analysis:7.2
+org.ow2.asm:asm-commons:7.2
+org.ow2.asm:asm-tree:7.2
+org.ow2.asm:asm:7.2

processor/gradle/dependency-locks/runtime.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/runtimeClasspath.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/testAnnotationProcessor.lockfile

@@ -0,0 +1,24 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.github.kevinstern:software-and-algorithms:1.0
+com.github.stephenc.jcip:jcip-annotations:1.0-1
+com.google.auto:auto-common:0.10
+com.google.code.findbugs:jFormatString:3.0.0
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotation:2.3.3
+com.google.errorprone:error_prone_annotations:2.3.3
+com.google.errorprone:error_prone_check_api:2.3.3
+com.google.errorprone:error_prone_core:2.3.3
+com.google.errorprone:error_prone_type_annotations:2.3.3
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:27.0.1-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.1
+com.google.protobuf:protobuf-java:3.4.0
+com.googlecode.java-diff-utils:diffutils:1.3.0
+org.checkerframework:checker-qual:2.5.3
+org.checkerframework:dataflow:2.5.3
+org.checkerframework:javacutil:2.5.3
+org.codehaus.mojo:animal-sniffer-annotations:1.17
+org.pcollections:pcollections:2.1.2

processor/gradle/dependency-locks/testApt.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.

processor/gradle/dependency-locks/testCompile.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/testCompileClasspath.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/testCompileOnly.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.

processor/gradle/dependency-locks/testRuntime.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/gradle/dependency-locks/testRuntimeClasspath.lockfile

@@ -0,0 +1,12 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.
+com.google.code.findbugs:jsr305:3.0.2
+com.google.errorprone:error_prone_annotations:2.3.4
+com.google.guava:failureaccess:1.0.1
+com.google.guava:guava:28.2-jre
+com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava
+com.google.j2objc:j2objc-annotations:1.3
+com.squareup:javapoet:1.12.1
+javax.persistence:javax.persistence-api:2.2
+org.checkerframework:checker-qual:2.10.0

processor/src/main/java/google/registry/processors/AbstractVKeyProcessor.java

@@ -0,0 +1,160 @@
+// Copyright 2020 The Nomulus 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 google.registry.processors;
+
+import static com.google.common.base.Preconditions.checkState;
+import static com.google.common.collect.ImmutableList.toImmutableList;
+
+import com.squareup.javapoet.AnnotationSpec;
+import com.squareup.javapoet.ClassName;
+import com.squareup.javapoet.JavaFile;
+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.io.UncheckedIOException;
+import java.util.List;
+import java.util.Set;
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.Modifier;
+import javax.lang.model.element.TypeElement;
+import javax.lang.model.type.DeclaredType;
+import javax.lang.model.type.TypeKind;
+import javax.lang.model.type.TypeMirror;
+import javax.lang.model.util.ElementFilter;
+import javax.lang.model.util.Elements;
+import javax.lang.model.util.Types;
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+/** Abstract processor to generate {@link AttributeConverter} for VKey type. */
+public abstract class AbstractVKeyProcessor extends AbstractProcessor {
+
+  private static final String CONVERTER_CLASS_NAME_TEMP = "VKeyConverter_%s";
+  // The method with same name should be defined in StringVKey and LongVKey
+  private static final String CLASS_NAME_SUFFIX_KEY = "classNameSuffix";
+
+  abstract Class<?> getSqlColumnType();
+
+  abstract String getAnnotationSimpleName();
+
+  @Override
+  public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+    annotations.forEach(
+        vKeyAnnotationType -> {
+          ElementFilter.typesIn(roundEnv.getElementsAnnotatedWith(vKeyAnnotationType))
+              .forEach(
+                  annotatedTypeElement -> {
+                    DeclaredType entityType = getDeclaredType(annotatedTypeElement);
+
+                    List<AnnotationMirror> actualAnnotation =
+                        annotatedTypeElement.getAnnotationMirrors().stream()
+                            .filter(
+                                annotationType ->
+                                    annotationType
+                                        .getAnnotationType()
+                                        .asElement()
+                                        .equals(vKeyAnnotationType))
+                            .collect(toImmutableList());
+                    checkState(
+                        actualAnnotation.size() == 1,
+                        String.format(
+                            "type can have only 1 %s annotation", getAnnotationSimpleName()));
+                    String converterClassNameSuffix =
+                        actualAnnotation.get(0).getElementValues().entrySet().stream()
+                            .filter(
+                                entry ->
+                                    entry
+                                        .getKey()
+                                        .getSimpleName()
+                                        .toString()
+                                        .equals(CLASS_NAME_SUFFIX_KEY))
+                            .map(entry -> ((String) entry.getValue().getValue()).trim())
+                            .findFirst()
+                            .orElse("");
+                    if (converterClassNameSuffix.isEmpty()) {
+                      converterClassNameSuffix =
+                          getTypeUtils().asElement(entityType).getSimpleName().toString();
+                    }
+
+                    try {
+                      createJavaFile(
+                              getPackageName(annotatedTypeElement),
+                              String.format(CONVERTER_CLASS_NAME_TEMP, converterClassNameSuffix),
+                              entityType)
+                          .writeTo(processingEnv.getFiler());
+                    } catch (IOException e) {
+                      throw new UncheckedIOException(e);
+                    }
+                  });
+        });
+    return false;
+  }
+
+  private JavaFile createJavaFile(
+      String packageName, String converterClassName, TypeMirror entityTypeMirror) {
+    TypeName entityType = ClassName.get(entityTypeMirror);
+
+    ParameterizedTypeName attributeConverter =
+        ParameterizedTypeName.get(
+            ClassName.get("google.registry.persistence.converter", "VKeyConverter"),
+            entityType,
+            ClassName.get(getSqlColumnType()));
+
+    MethodSpec getAttributeClass =
+        MethodSpec.methodBuilder("getAttributeClass")
+            .addAnnotation(Override.class)
+            .addModifiers(Modifier.PROTECTED)
+            .returns(
+                ParameterizedTypeName.get(
+                    ClassName.get(Class.class), ClassName.get(entityTypeMirror)))
+            .addStatement("return $T.class", entityType)
+            .build();
+
+    TypeSpec vKeyConverter =
+        TypeSpec.classBuilder(converterClassName)
+            .addAnnotation(
+                AnnotationSpec.builder(ClassName.get(Converter.class))
+                    .addMember("autoApply", "true")
+                    .build())
+            .addModifiers(Modifier.FINAL)
+            .superclass(attributeConverter)
+            .addMethod(getAttributeClass)
+            .build();
+
+    return JavaFile.builder(packageName, vKeyConverter).build();
+  }
+
+  private DeclaredType getDeclaredType(Element element) {
+    checkState(element.asType().getKind() == TypeKind.DECLARED, "element is not a DeclaredType");
+    return (DeclaredType) element.asType();
+  }
+
+  private String getPackageName(Element element) {
+    return getElementUtils().getPackageOf(element).getQualifiedName().toString();
+  }
+
+  private Elements getElementUtils() {
+    return processingEnv.getElementUtils();
+  }
+
+  private Types getTypeUtils() {
+    return processingEnv.getTypeUtils();
+  }
+}

processor/src/main/java/google/registry/processors/LongVKeyProcessor.java

@@ -0,0 +1,37 @@
+// Copyright 2020 The Nomulus 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 google.registry.processors;
+
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.annotation.processing.SupportedSourceVersion;
+import javax.lang.model.SourceVersion;
+
+/** Annotation processor for entity that is annotated with WithLongVKey. */
+@SupportedAnnotationTypes("google.registry.persistence.WithLongVKey")
+@SupportedSourceVersion(SourceVersion.RELEASE_8)
+public class LongVKeyProcessor extends AbstractVKeyProcessor {
+
+  private static final String ANNOTATION_SIMPLE_NAME = "WithStringVKey";
+
+  @Override
+  Class<?> getSqlColumnType() {
+    return Long.class;
+  }
+
+  @Override
+  String getAnnotationSimpleName() {
+    return ANNOTATION_SIMPLE_NAME;
+  }
+}

processor/src/main/java/google/registry/processors/StringVKeyProcessor.java

@@ -0,0 +1,37 @@
+// Copyright 2020 The Nomulus 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 google.registry.processors;
+
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.annotation.processing.SupportedSourceVersion;
+import javax.lang.model.SourceVersion;
+
+/** Annotation processor for entity that is annotated with WithStringVKey. */
+@SupportedAnnotationTypes("google.registry.persistence.WithStringVKey")
+@SupportedSourceVersion(SourceVersion.RELEASE_8)
+public class StringVKeyProcessor extends AbstractVKeyProcessor {
+
+  private static final String ANNOTATION_SIMPLE_NAME = "WithStringVKey";
+
+  @Override
+  Class<?> getSqlColumnType() {
+    return String.class;
+  }
+
+  @Override
+  String getAnnotationSimpleName() {
+    return ANNOTATION_SIMPLE_NAME;
+  }
+}

processor/src/main/resources/META-INF/services/javax.annotation.processing.Processor

@@ -0,0 +1,2 @@
+google.registry.processors.StringVKeyProcessor
+google.registry.processors.LongVKeyProcessor