HSEARCH-4482 Avoid uses of Hibernate ORM's org.hibernate.tuple.entity…

….EntityMetamodel internally where possible

mapper/orm/src/main/java/org/hibernate/search/mapper/orm/common/impl/HibernateOrmUtils.java

@@ -23,6 +23,7 @@
 import org.hibernate.engine.spi.SessionImplementor;
 import org.hibernate.mapping.Property;
 import org.hibernate.metamodel.MappingMetamodel;
+import org.hibernate.metamodel.mapping.EntityMappingType;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.search.mapper.orm.logging.impl.Log;
 import org.hibernate.search.util.common.annotation.impl.SuppressForbiddenApis;
@@ -83,8 +84,7 @@ public static EntityPersister toRootEntityType(SessionFactoryImplementor session
 		return metamodel.getEntityDescriptor( rootEntityName );
 	}
 
-	public static EntityPersister toMostSpecificCommonEntitySuperType(MappingMetamodel metamodel,
-			EntityPersister type1, EntityPersister type2) {
+	public static EntityPersister toMostSpecificCommonEntitySuperType(EntityPersister type1, EntityPersister type2) {
 		/*
 		 * We need to rely on Hibernate ORM's SPIs: this is complex stuff.
 		 * For example there may be class hierarchies such as A > B > C
@@ -94,10 +94,9 @@ public static EntityPersister toMostSpecificCommonEntitySuperType(MappingMetamod
 		 */
 		EntityPersister superTypeCandidate = type1;
 		while ( superTypeCandidate != null && !isSuperTypeOf( superTypeCandidate, type2 ) ) {
-			String superSuperTypeEntityName = superTypeCandidate.getEntityMetamodel().getSuperclass();
-			superTypeCandidate = superSuperTypeEntityName == null
-					? null
-					: metamodel.getEntityDescriptor( superSuperTypeEntityName ).getEntityPersister();
+			EntityMappingType superSuperType = superTypeCandidate.getSuperMappingType();
+			superTypeCandidate = superSuperType == null
+					? null : superSuperType.getEntityPersister();
 		}
 		if ( superTypeCandidate == null ) {
 			throw new AssertionFailure(
@@ -121,7 +120,7 @@ public static boolean targetsAllConcreteSubTypes(SessionFactoryImplementor sessi
 		MappingMetamodel metamodel = sessionFactory.getMappingMetamodel();
 		int concreteSubTypesCount = 0;
 		for ( String subClassEntityName : subClassEntityNames ) {
-			if ( !metamodel.getEntityDescriptor( subClassEntityName ).getEntityMetamodel().isAbstract() ) {
+			if ( !metamodel.getEntityDescriptor( subClassEntityName ).isAbstract() ) {
 				++concreteSubTypesCount;
 			}
 		}

mapper/orm/src/main/java/org/hibernate/search/mapper/orm/loading/impl/HibernateOrmEntityIdEntityLoadingStrategy.java

@@ -12,7 +12,6 @@
 import org.hibernate.AssertionFailure;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.engine.spi.SessionImplementor;
-import org.hibernate.metamodel.MappingMetamodel;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.search.mapper.orm.common.impl.HibernateOrmUtils;
 import org.hibernate.search.mapper.orm.search.loading.EntityLoadingCacheLookupStrategy;
@@ -151,15 +150,14 @@ private PojoSelectionEntityLoader<?> doCreate(EntityPersister entityPersister,
 
 	private static EntityPersister toMostSpecificCommonEntitySuperType(SessionImplementor session,
 			Iterable<? extends LoadingTypeContext<?>> targetEntityTypeContexts) {
-		MappingMetamodel metamodel = session.getSessionFactory().getMappingMetamodel();
 		EntityPersister result = null;
 		for ( LoadingTypeContext<?> targetTypeContext : targetEntityTypeContexts ) {
 			EntityPersister type = targetTypeContext.entityPersister();
 			if ( result == null ) {
 				result = type;
 			}
 			else {
-				result = HibernateOrmUtils.toMostSpecificCommonEntitySuperType( metamodel, result, type );
+				result = HibernateOrmUtils.toMostSpecificCommonEntitySuperType( result, type );
 			}
 		}
 		return result;