HHH-19958 Implement the custom orm.xml <generated> tag

hibernate-core/src/main/java/org/hibernate/boot/models/xml/internal/XmlAnnotationHelper.java

@@ -20,6 +20,7 @@
 import java.time.OffsetTime;
 import java.time.ZonedDateTime;
 import java.util.ArrayList;
+import java.util.EnumSet;
 import java.util.List;
 import java.util.UUID;
 import java.util.function.Consumer;
@@ -32,6 +33,7 @@
 import org.hibernate.annotations.ResultCheckStyle;
 import org.hibernate.annotations.SecondaryRow;
 import org.hibernate.boot.internal.LimitedCollectionClassification;
+import org.hibernate.boot.jaxb.mapping.GenerationTiming;
 import org.hibernate.boot.jaxb.mapping.spi.JaxbAssociationOverrideImpl;
 import org.hibernate.boot.jaxb.mapping.spi.JaxbAttributeOverrideImpl;
 import org.hibernate.boot.jaxb.mapping.spi.JaxbBasicMapping;
@@ -90,6 +92,7 @@
 import org.hibernate.boot.models.xml.spi.XmlDocument;
 import org.hibernate.boot.models.xml.spi.XmlDocumentContext;
 import org.hibernate.engine.spi.ExecuteUpdateResultCheckStyle;
+import org.hibernate.generator.EventType;
 import org.hibernate.internal.util.StringHelper;
 import org.hibernate.internal.util.collections.CollectionHelper;
 import org.hibernate.models.ModelsException;
@@ -479,6 +482,27 @@ public static void applyNationalized(
 		memberDetails.applyAnnotationUsage( HibernateAnnotations.NATIONALIZED, xmlDocumentContext.getModelBuildingContext() );
 	}
 
+	public static void applyGenerated(
+			GenerationTiming timing,
+			MutableMemberDetails memberDetails,
+			XmlDocumentContext xmlDocumentContext) {
+		if ( timing == null ) {
+			return;
+		}
+
+		EnumSet<EventType> eventTypes = timing.getEventTypes();
+		if ( eventTypes == null ) {
+			return;
+		}
+
+		final GeneratedAnnotation generatedAnn = (GeneratedAnnotation) memberDetails.applyAnnotationUsage(
+				HibernateAnnotations.GENERATED,
+				xmlDocumentContext.getModelBuildingContext()
+		);
+
+		generatedAnn.event( eventTypes.toArray( new EventType[0] ) );
+	}
+
 	public static void applyGeneratedValue(
 			JaxbGeneratedValueImpl jaxbGeneratedValue,
 			MutableMemberDetails memberDetails,

hibernate-core/src/main/java/org/hibernate/boot/models/xml/internal/attr/BasicAttributeProcessing.java

@@ -78,8 +78,8 @@ else if ( jaxbBasic.getColumn() != null ) {
 		XmlAnnotationHelper.applyLob( jaxbBasic.getLob(), memberDetails, xmlDocumentContext );
 		XmlAnnotationHelper.applyEnumerated( jaxbBasic.getEnumerated(), memberDetails, xmlDocumentContext );
 		XmlAnnotationHelper.applyNationalized( jaxbBasic.getNationalized(), memberDetails, xmlDocumentContext );
+		XmlAnnotationHelper.applyGenerated( jaxbBasic.getGenerated(), memberDetails, xmlDocumentContext );
 
-		// todo : value generation
 		// todo : ...
 
 		return memberDetails;

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/various/OrmXmlGeneratedTest.java

@@ -0,0 +1,52 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.annotations.various;
+
+import org.hibernate.boot.Metadata;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.spi.MetadataImplementor;
+import org.hibernate.generator.EventType;
+import org.hibernate.mapping.GeneratorCreator;
+import org.hibernate.mapping.PersistentClass;
+import org.hibernate.testing.ServiceRegistryBuilder;
+import org.hibernate.testing.orm.junit.BaseUnitTest;
+import org.hibernate.testing.util.uuid.IdGeneratorCreationContext;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@BaseUnitTest
+class OrmXmlGeneratedTest {
+
+	@Test
+	void testOrmXmlDefinedGenerated() {
+		StandardServiceRegistry ssr = ServiceRegistryBuilder.buildServiceRegistry();
+
+		try {
+			MetadataSources ms = new MetadataSources( ssr );
+			ms.addResource( "org/hibernate/orm/test/annotations/generated/ormXml/orm.xml" );
+
+			Metadata metadata = ms.buildMetadata();
+
+			PersistentClass entityBinding = metadata.getEntityBinding( Tractor.class.getName() );
+			GeneratorCreator generator = entityBinding
+					.getProperty( "serialNumber" )
+					.getValueGeneratorCreator();
+
+			assertThat( generator )
+					.extracting( creator -> creator.createGenerator(
+							new IdGeneratorCreationContext( (MetadataImplementor) metadata, entityBinding.getRootClass() )
+					) )
+					.satisfies( gen ->
+							assertThat( gen.getEventTypes() )
+									.containsExactly( EventType.INSERT, EventType.UPDATE, EventType.FORCE_INCREMENT )
+					);
+		}
+		finally {
+			ServiceRegistryBuilder.destroy( ssr );
+		}
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/various/Tractor.java

@@ -0,0 +1,13 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.annotations.various;
+
+public class Tractor {
+
+	public Long id;
+	public String model;
+	public int serialNumber;
+
+}

hibernate-core/src/test/resources/org/hibernate/orm/test/annotations/generated/ormXml/orm.xml

@@ -0,0 +1,17 @@
+<!--
+  ~ SPDX-License-Identifier: Apache-2.0
+  ~ Copyright Red Hat Inc. and Hibernate Authors
+  -->
+<entity-mappings xmlns="http://www.hibernate.org/xsd/orm/mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                 version="7.0">
+
+    <entity name="tractor" class="org.hibernate.orm.test.annotations.various.Tractor" access="FIELD" metadata-complete="true">
+        <attributes>
+            <id name="id" />
+            <basic name="model"/>
+            <basic name="serialNumber">
+                <generated>ALWAYS</generated>
+            </basic>
+        </attributes>
+    </entity>
+</entity-mappings>