Implemented @Parent

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/EmbeddableValuedModelPart.java

@@ -8,6 +8,7 @@ package org.hibernate.metamodel.mapping;
 
 import java.util.List;
 
+import org.hibernate.property.access.spi.PropertyAccess;
 import org.hibernate.query.sqm.sql.SqmToSqlAstConverter;
 import org.hibernate.sql.ast.Clause;
 import org.hibernate.sql.ast.spi.SqlAstCreationState;
@@ -46,7 +47,9 @@ public interface EmbeddableValuedModelPart extends ModelPart, Fetchable, Fetchab
 	/**
 	 * @see org.hibernate.annotations.Parent
 	 */
-	SingularAttributeMapping getParentInjectionAttributeMapping();
+	default PropertyAccess getParentInjectionAttributePropertyAccess() {
+		return null;
+	}
 
 	Expression toSqlExpression(
 			TableGroup tableGroup,

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/EmbeddedAttributeMapping.java

@@ -22,9 +22,9 @@ import org.hibernate.metamodel.mapping.EntityMappingType;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.ManagedMappingType;
 import org.hibernate.metamodel.mapping.ModelPart;
-import org.hibernate.metamodel.mapping.SingularAttributeMapping;
 import org.hibernate.metamodel.mapping.StateArrayContributorMetadataAccess;
 import org.hibernate.metamodel.model.domain.NavigableRole;
+import org.hibernate.property.access.internal.PropertyAccessStrategyBasicImpl;
 import org.hibernate.property.access.spi.PropertyAccess;
 import org.hibernate.query.NavigablePath;
 import org.hibernate.query.sqm.sql.SqmToSqlAstConverter;
@@ -62,6 +62,7 @@ public class EmbeddedAttributeMapping
 	private final String tableExpression;
 	private final String[] attrColumnNames;
 	private final EmbeddableMappingType embeddableMappingType;
+	private final PropertyAccess parentInjectionAttributeProperyAccess;
 
 	@SuppressWarnings("WeakerAccess")
 	public EmbeddedAttributeMapping(
@@ -71,6 +72,7 @@ public class EmbeddedAttributeMapping
 			String tableExpression,
 			String[] attrColumnNames,
 			StateArrayContributorMetadataAccess attributeMetadataAccess,
+			String parentInjectionAttributeName,
 			FetchStrategy mappedFetchStrategy,
 			EmbeddableMappingType embeddableMappingType,
 			ManagedMappingType declaringType,
@@ -83,6 +85,15 @@ public class EmbeddedAttributeMapping
 				declaringType,
 				propertyAccess
 		);
+		if ( parentInjectionAttributeName != null ) {
+			parentInjectionAttributeProperyAccess = PropertyAccessStrategyBasicImpl.INSTANCE.buildPropertyAccess(
+					embeddableMappingType.getMappedJavaTypeDescriptor().getJavaType(),
+					parentInjectionAttributeName
+			);
+		}
+		else {
+			parentInjectionAttributeProperyAccess = null;
+		}
 		this.navigableRole = navigableRole;
 		this.tableExpression = tableExpression;
 		this.attrColumnNames = attrColumnNames;
@@ -99,12 +110,6 @@ public class EmbeddedAttributeMapping
 		return embeddableMappingType;
 	}
 
-	@Override
-	public SingularAttributeMapping getParentInjectionAttributeMapping() {
-		// todo (6.0) : implement
-		return null;
-	}
-
 	@Override
 	public String getContainingTableExpression() {
 		return tableExpression;
@@ -115,6 +120,11 @@ public class EmbeddedAttributeMapping
 		return Arrays.asList( attrColumnNames );
 	}
 
+	@Override
+	public PropertyAccess getParentInjectionAttributePropertyAccess() {
+		return parentInjectionAttributeProperyAccess;
+	}
+
 	@Override
 	public void visitJdbcTypes(
 			Consumer<JdbcMapping> action,

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/EmbeddedCollectionPart.java

@@ -22,9 +22,10 @@ import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.MappingType;
 import org.hibernate.metamodel.mapping.ModelPart;
 import org.hibernate.metamodel.mapping.PluralAttributeMapping;
-import org.hibernate.metamodel.mapping.SingularAttributeMapping;
 import org.hibernate.metamodel.model.domain.NavigableRole;
 import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.property.access.internal.PropertyAccessStrategyBasicImpl;
+import org.hibernate.property.access.spi.PropertyAccess;
 import org.hibernate.query.NavigablePath;
 import org.hibernate.query.sqm.sql.SqmToSqlAstConverter;
 import org.hibernate.sql.ast.Clause;
@@ -59,7 +60,7 @@ public class EmbeddedCollectionPart implements CollectionPart, EmbeddableValuedF
 
 	private final String containingTableExpression;
 
-	private final SingularAttributeMapping parentInjectionAttribute;
+	private final PropertyAccess parentInjectionAttributeProperyAccess;
 	private final List<String> columnExpressions;
 	private final String sqlAliasStem;
 
@@ -68,15 +69,24 @@ public class EmbeddedCollectionPart implements CollectionPart, EmbeddableValuedF
 			CollectionPersister collectionDescriptor,
 			Nature nature,
 			EmbeddableMappingType embeddableMappingType,
-			SingularAttributeMapping parentInjectionAttribute,
+			String parentInjectionAttributeName,
 			String containingTableExpression,
 			List<String> columnExpressions,
 			String sqlAliasStem) {
 		this.navigableRole = collectionDescriptor.getNavigableRole().appendContainer( nature.getName() );
 		this.collectionDescriptor = collectionDescriptor;
 		this.nature = nature;
+		if ( parentInjectionAttributeName != null ) {
+			parentInjectionAttributeProperyAccess = PropertyAccessStrategyBasicImpl.INSTANCE.buildPropertyAccess(
+					embeddableMappingType.getMappedJavaTypeDescriptor().getJavaType(),
+					parentInjectionAttributeName
+			);
+		}
+		else {
+			parentInjectionAttributeProperyAccess = null;
+		}
 		this.embeddableMappingType = embeddableMappingType;
-		this.parentInjectionAttribute = parentInjectionAttribute;
+
 		this.containingTableExpression = containingTableExpression;
 		this.columnExpressions = columnExpressions;
 		this.sqlAliasStem = sqlAliasStem;
@@ -108,8 +118,8 @@ public class EmbeddedCollectionPart implements CollectionPart, EmbeddableValuedF
 	}
 
 	@Override
-	public SingularAttributeMapping getParentInjectionAttributeMapping() {
+	public PropertyAccess getParentInjectionAttributePropertyAccess() {
-		return parentInjectionAttribute;
+		return parentInjectionAttributeProperyAccess;
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/MappingModelCreationHelper.java

@@ -413,8 +413,9 @@ public class MappingModelCreationHelper {
 				creationProcess
 		);
 
+		final Component component = (Component) bootProperty.getValue();
 		final EmbeddableMappingType embeddableMappingType = EmbeddableMappingType.from(
-				(Component) bootProperty.getValue(),
+				component,
 				attrType,
 				attributeMappingType -> new EmbeddedAttributeMapping(
 						attrName,
@@ -423,6 +424,7 @@ public class MappingModelCreationHelper {
 						tableExpression,
 						attrColumnNames,
 						attributeMetadataAccess,
+						component.getParentProperty(),
 						FetchStrategy.IMMEDIATE_JOIN,
 						attributeMappingType,
 						declaringType,
@@ -1115,7 +1117,7 @@ public class MappingModelCreationHelper {
 							CollectionPart.Nature.INDEX,
 							inflightDescriptor,
 							// parent-injection
-							null,
+							component.getParentProperty(),
 							tableExpression,
 							columnExpressions,
 							sqlAliasStem
@@ -1206,7 +1208,7 @@ public class MappingModelCreationHelper {
 							CollectionPart.Nature.ELEMENT,
 							embeddableMappingType,
 							// parent-injection
-							null,
+							component.getParentProperty(),
 							tableExpression,
 							columnExpressions,
 							sqlAliasStem

hibernate-core/src/main/java/org/hibernate/sql/results/graph/embeddable/AbstractEmbeddableInitializer.java

@@ -9,16 +9,20 @@ package org.hibernate.sql.results.graph.embeddable;
 import java.util.IdentityHashMap;
 import java.util.Map;
 
+import org.hibernate.NotYetImplementedFor6Exception;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
 import org.hibernate.metamodel.mapping.EmbeddableValuedModelPart;
-import org.hibernate.metamodel.mapping.SingularAttributeMapping;
 import org.hibernate.metamodel.mapping.StateArrayContributorMapping;
+import org.hibernate.property.access.spi.PropertyAccess;
 import org.hibernate.query.NavigablePath;
 import org.hibernate.sql.results.graph.AbstractFetchParentAccess;
 import org.hibernate.sql.results.graph.AssemblerCreationState;
 import org.hibernate.sql.results.graph.DomainResultAssembler;
 import org.hibernate.sql.results.graph.Fetch;
 import org.hibernate.sql.results.graph.FetchParentAccess;
+import org.hibernate.sql.results.graph.Initializer;
+import org.hibernate.sql.results.graph.collection.CollectionInitializer;
+import org.hibernate.sql.results.graph.entity.EntityInitializer;
 import org.hibernate.sql.results.internal.NullValueAssembler;
 import org.hibernate.sql.results.jdbc.spi.RowProcessingState;
 
@@ -28,7 +32,7 @@ import org.hibernate.sql.results.jdbc.spi.RowProcessingState;
 public abstract class AbstractEmbeddableInitializer extends AbstractFetchParentAccess implements EmbeddableInitializer {
 	private final NavigablePath navigablePath;
 	private final EmbeddableValuedModelPart embeddedModelPartDescriptor;
-	private final FetchParentAccess fetchParentAccess;
+	private FetchParentAccess fetchParentAccess;
 
 	private final Map<StateArrayContributorMapping, DomainResultAssembler> assemblerMap;
 
@@ -92,9 +96,10 @@ public abstract class AbstractEmbeddableInitializer extends AbstractFetchParentA
 		// todo (6.0) : register "parent resolution listener" if the composite is defined for `@Parent`
 		//		something like:
 
-		final SingularAttributeMapping parentInjectionTarget = embeddedModelPartDescriptor.getParentInjectionAttributeMapping();
+		final PropertyAccess parentInjectionPropertyAccess = embeddedModelPartDescriptor.getParentInjectionAttributePropertyAccess();
 
-		if ( parentInjectionTarget != null ) {
+		if ( parentInjectionPropertyAccess != null ) {
+			if ( getFetchParentAccess() != null ) {
 				getFetchParentAccess().findFirstEntityDescriptorAccess().registerResolutionListener(
 						// todo (6.0) : this is the legacy behavior
 						// 		- the first entity is injected as the parent, even if the composite
@@ -103,7 +108,7 @@ public abstract class AbstractEmbeddableInitializer extends AbstractFetchParentA
 							if ( compositeInstance == null ) {
 								return;
 							}
-						parentInjectionTarget.getPropertyAccess().getSetter().set(
+							parentInjectionPropertyAccess.getSetter().set(
 									compositeInstance,
 									owner,
 									rowProcessingState.getSession().getFactory()
@@ -111,7 +116,7 @@ public abstract class AbstractEmbeddableInitializer extends AbstractFetchParentA
 						}
 				);
 			}
-
+		}
 	}
 
 	@Override
@@ -130,6 +135,33 @@ public abstract class AbstractEmbeddableInitializer extends AbstractFetchParentA
 	@Override
 	public void initializeInstance(RowProcessingState rowProcessingState) {
 
+		final PropertyAccess parentInjectionPropertyAccess = embeddedModelPartDescriptor.getParentInjectionAttributePropertyAccess();
+
+		if ( parentInjectionPropertyAccess != null && getFetchParentAccess() == null ) {
+			Initializer initializer = rowProcessingState.resolveInitializer( navigablePath.getParent() );
+			final Object owner;
+			if ( initializer instanceof CollectionInitializer ) {
+				owner = ( (CollectionInitializer) initializer ).getCollectionInstance().getOwner();
+			}
+			else if ( initializer instanceof EntityInitializer ) {
+				owner = ( (EntityInitializer) initializer ).getEntityInstance();
+
+				parentInjectionPropertyAccess.getSetter().set(
+						compositeInstance,
+						owner,
+						rowProcessingState.getSession().getFactory()
+				);
+			}
+			else {
+				throw new NotYetImplementedFor6Exception( getClass() );
+			}
+			parentInjectionPropertyAccess.getSetter().set(
+					compositeInstance,
+					owner,
+					rowProcessingState.getSession().getFactory()
+			);
+		}
+
 		EmbeddableLoadingLogger.INSTANCE.debugf(
 				"Initializing composite instance [%s] : %s",
 				navigablePath,

hibernate-core/src/test/java/org/hibernate/orm/test/bootstrap/binding/annotations/embedded/EmbeddedTest.java

@@ -484,7 +484,6 @@ public class EmbeddedTest {
 	}
 
 	@Test
-	@FailureExpected(reason = "@Parent annotation mapping has not yet been implemented")
 	public void testParent(SessionFactoryScope scope) {
 		Book book = new Book();
 		scope.inTransaction(