Hacking about... #2164
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package build.tools.valueclasses; | ||
|
|
||
| import javax.annotation.processing.AbstractProcessor; | ||
| import javax.annotation.processing.RoundEnvironment; | ||
| import javax.annotation.processing.SupportedAnnotationTypes; | ||
| import javax.annotation.processing.SupportedSourceVersion; | ||
| import javax.lang.model.SourceVersion; | ||
| import javax.lang.model.element.Element; | ||
| import javax.lang.model.element.Name; | ||
| import javax.lang.model.element.TypeElement; | ||
| import java.util.Optional; | ||
| import java.util.Set; | ||
| import java.util.TreeSet; | ||
|
|
||
| /** | ||
| * <ul> | ||
| * <li>{@code @jdk.internal.ValueBased} appears on concrete value classes. | ||
| * <li>{@code @jdk.internal.MigratedValueClass} appears on concrete and abstract value classes. | ||
| * </ul> | ||
| */ | ||
| @SupportedAnnotationTypes({"jdk.internal.*"}) | ||
| public final class GenValueClassList extends AbstractProcessor { | ||
| /** | ||
| * Override to return latest version, since the runtime in which this is | ||
| * compiled doesn't know about development source versions. | ||
| */ | ||
| @Override | ||
| public SourceVersion getSupportedSourceVersion() { | ||
| return SourceVersion.latest(); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment env) { | ||
| // We don't have direct access to ValueBased or MigratedValueClass | ||
| // classes here, but we can find the matching type elements. | ||
| Optional<? extends TypeElement> migratedValueClass = | ||
| getAnnotation(annotations, "jdk.internal.MigratedValueClass"); | ||
| Optional<? extends TypeElement> valueBased = | ||
| getAnnotation(annotations, "jdk.internal.ValueBased"); | ||
| if (migratedValueClass.isPresent() && valueBased.isPresent()) { | ||
| Set<String> valueClasses = getAnnotatedTypeNames(env, migratedValueClass.get()); | ||
| Set<String> abstractClasses = getAnnotatedTypeNames(env, valueBased.get()); | ||
| //valueClasses.forEach(n -> System.out.format("---> %s (%s)", n, abstractClasses.contains(n) ? "abstract" : "concrete")); | ||
| } | ||
| return true; | ||
| } | ||
|
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| private static Optional<? extends TypeElement> getAnnotation(Set<? extends TypeElement> annotations, String name) { | ||
| return annotations.stream() | ||
| .filter(e -> e.getQualifiedName().toString().equals(name)) | ||
| .findFirst(); | ||
| } | ||
|
|
||
| private static Set<String> getAnnotatedTypeNames(RoundEnvironment env, TypeElement annotation) { | ||
| Set<String> typeNames = new TreeSet<>(); | ||
| for (Element e : env.getElementsAnnotatedWith(annotation)) { | ||
| if (!e.getKind().isClass()) { | ||
| throw new IllegalStateException( | ||
| "Unexpected element kind (" + e.getKind() + ") for element: " + e); | ||
| } | ||
| Name fqn = ((TypeElement) e).getQualifiedName(); | ||
| if (fqn.isEmpty()) { | ||
| throw new IllegalStateException( | ||
| "Unexpected empty name for element: " + e); | ||
| } | ||
| typeNames.add(fqn.toString()); | ||
| } | ||
| return typeNames; | ||
| } | ||
| } |
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Lots of this is unrelated to annotation processing per se, just renaming "value class" stuff when it's really just "preview" stuff more generally.