97 Add dynamic-class resolution support to MutableClassDetailsRegistry

hibernate-models-jandex/src/test/java/org/hibernate/models/dynamic/SimpleDynamicModelTests.java

@@ -90,6 +90,64 @@ void testSimpleBasics() {
 		checkPersistability( entityDetails.getFields().get( 1 ) );
 	}
 
+
+	@Test
+	void testResolveClassDetails() {
+		final SourceModelBuildingContext buildingContext = SourceModelTestHelper.createBuildingContext( (Index) null );
+		final ClassDetailsRegistry classDetailsRegistry = buildingContext.getClassDetailsRegistry();
+
+		final ClassDetails integerClassDetails = classDetailsRegistry.getClassDetails( Integer.class.getName() );
+		final ClassTypeDetailsImpl integerTypeDetails = new ClassTypeDetailsImpl( integerClassDetails, TypeDetails.Kind.CLASS );
+
+		final ClassDetails stringClassDetails = classDetailsRegistry.getClassDetails( String.class.getName() );
+		final ClassTypeDetailsImpl stringTypeDetails = new ClassTypeDetailsImpl( stringClassDetails, TypeDetails.Kind.CLASS );
+
+		classDetailsRegistry.as( MutableClassDetailsRegistry.class )
+				.resolveClassDetails( "TheEntity", (name) -> new DynamicClassDetails( name, buildingContext ) );
+
+		final DynamicClassDetails entityDetails = (DynamicClassDetails) classDetailsRegistry.resolveClassDetails( "TheEntity" );
+		final Entity created = entityDetails.applyAnnotationUsage(
+				JpaAnnotations.ENTITY,
+				buildingContext
+		);
+		final Entity preExisting = entityDetails.applyAnnotationUsage(
+				JpaAnnotations.ENTITY,
+				buildingContext
+		);
+		assertThat( created ).isSameAs( preExisting );
+
+		final DynamicFieldDetails idMember = entityDetails.applyAttribute(
+				"id",
+				integerTypeDetails,
+				false,
+				false,
+				buildingContext
+		);
+		final Id first = idMember.applyAnnotationUsage(
+				JpaAnnotations.ID,
+				buildingContext
+		);
+		final Id second = idMember.applyAnnotationUsage(
+				JpaAnnotations.ID,
+				buildingContext
+		);
+		assertThat( first ).isSameAs( second );
+
+		entityDetails.applyAttribute(
+				"name",
+				stringTypeDetails,
+				false,
+				false,
+				buildingContext
+		);
+
+		assertThat( entityDetails.getFields() ).hasSize( 2 );
+		assertThat( entityDetails.getFields().get( 0 ).getName() ).isEqualTo( "id" );
+		assertThat( entityDetails.getFields().get( 0 ).hasDirectAnnotationUsage( Id.class ) ).isTrue();
+		checkPersistability( entityDetails.getFields().get( 0 ) );
+		checkPersistability( entityDetails.getFields().get( 1 ) );
+	}
+
 	private void checkPersistability(FieldDetails fieldDetails) {
 		assertThat( fieldDetails.isPersistable() ).isTrue();
 

hibernate-models/src/main/java/org/hibernate/models/internal/AbstractClassDetailsRegistry.java

@@ -15,7 +15,6 @@
 import org.hibernate.models.spi.ClassDetails;
 import org.hibernate.models.spi.ClassDetailsBuilder;
 import org.hibernate.models.spi.SourceModelBuildingContext;
-import org.hibernate.models.spi.VoidTypeDetails;
 
 /**
  * @author Steve Ebersole
@@ -126,4 +125,40 @@ public void addClassDetails(String name, ClassDetails classDetails) {
 			subTypes.add( classDetails );
 		}
 	}
+
+	@Override
+	public ClassDetails resolveClassDetails(String name, ClassDetailsCreator creator) {
+		if ( name == null ) {
+			throw new IllegalArgumentException( "`name` cannot be null" );
+		}
+
+		if ( "void".equals( name ) ) {
+			return null;
+		}
+
+		final ClassDetails existing = classDetailsMap.get( name );
+		if ( existing != null ) {
+			return existing;
+		}
+
+		return createClassDetails( name, creator );
+	}
+
+	protected ClassDetails createClassDetails(String name, ClassDetailsCreator creator) {
+		try {
+			final ClassDetails created = creator.createClassDetails( name );
+			addClassDetails( name, created );
+			return created;
+		}
+		catch (UnknownClassException e) {
+			// see if it might be a package name...
+			try {
+				return creator.createClassDetails( name + ".package-info" );
+			}
+			catch (UnknownClassException noPackage) {
+				throw e;
+			}
+		}
+	}
+
 }

hibernate-models/src/main/java/org/hibernate/models/internal/MutableClassDetailsRegistry.java

@@ -7,6 +7,7 @@
 
 package org.hibernate.models.internal;
 
+import org.hibernate.models.UnknownClassException;
 import org.hibernate.models.spi.ClassDetails;
 import org.hibernate.models.spi.ClassDetailsRegistry;
 
@@ -24,4 +25,21 @@ public interface MutableClassDetailsRegistry extends ClassDetailsRegistry {
 	 * Adds a managed-class descriptor using the given {@code name} as the registration key
 	 */
 	void addClassDetails(String name, ClassDetails classDetails);
+
+	/**
+	 * Resolve (find or create) ClassDetails by name.  If there is currently no
+	 * such registration, one is created using the specified {@code creator}.
+	 */
+	ClassDetails resolveClassDetails(String name, ClassDetailsCreator creator);
+
+	/**
+	 * Create a CLass Details
+	 */
+	@FunctionalInterface
+	interface  ClassDetailsCreator {
+		/**
+		 * @throws UnknownClassException
+		 */
+		ClassDetails createClassDetails(String name) throws UnknownClassException;
+	}
 }