Hibernate example source code file (MetadataContext.java)
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The Hibernate MetadataContext.java source code
/*
* Copyright (c) 2009, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.ejb.metamodel;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.IdentifiableType;
import javax.persistence.metamodel.SingularAttribute;
import org.hibernate.annotations.common.AssertionFailure;
import org.hibernate.ejb.internal.EntityManagerMessageLogger;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.mapping.Component;
import org.hibernate.mapping.KeyValue;
import org.hibernate.mapping.MappedSuperclass;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.Property;
import org.jboss.logging.Logger;
/**
* Defines a context for storing information during the building of the {@link MetamodelImpl}.
* <p/>
* This contextual information includes data needing to be processed in a second pass as well as
* cross-references into the built metamodel classes.
* <p/>
* At the end of the day, clients are interested in the {@link #getEntityTypeMap} and {@link #getEmbeddableTypeMap}
* results, which represent all the registered {@linkplain #registerEntityType entities} and
* {@linkplain #registerEmbeddedableType embeddables} respectively.
*
* @author Steve Ebersole
* @author Emmanuel Bernard
*/
class MetadataContext {
private static final EntityManagerMessageLogger LOG = Logger.getMessageLogger(EntityManagerMessageLogger.class,
MetadataContext.class.getName());
private final SessionFactoryImplementor sessionFactory;
private final AttributeFactory attributeFactory = new AttributeFactory( this );
private Map<Class> entityTypes
= new HashMap<Class>();
private Map<String,EntityTypeImpl entityTypesByEntityName
= new HashMap<String, EntityTypeImpl();
private Map<PersistentClass,EntityTypeImpl entityTypesByPersistentClass
= new HashMap<PersistentClass,EntityTypeImpl();
private Map<Class> embeddables
= new HashMap<Class>();
private Map<MappedSuperclass, MappedSuperclassTypeImpl mappedSuperclassByMappedSuperclassMapping
= new HashMap<MappedSuperclass,MappedSuperclassTypeImpl();
//this list contains MappedSuperclass and EntityTypes ordered by superclass first
private List<Object> orderedMappings = new ArrayList();
/**
* Stack of PersistentClass being process. Last in the list is the highest in the stack.
*
*/
private List<PersistentClass> stackOfPersistentClassesBeingProcessed
= new ArrayList<PersistentClass>();
private Map<MappedSuperclassTypeImpl mappedSuperClassTypeToPersistentClass
= new HashMap<MappedSuperclassTypeImpl();
public MetadataContext(SessionFactoryImplementor sessionFactory) {
this.sessionFactory = sessionFactory;
}
/*package*/ SessionFactoryImplementor getSessionFactory() {
return sessionFactory;
}
/**
* Retrieves the {@linkplain Class java type} to {@link EntityTypeImpl} map.
*
* @return The {@linkplain Class java type} to {@link EntityTypeImpl} map.
*/
public Map<Class> getEntityTypeMap() {
return Collections.unmodifiableMap( entityTypes );
}
public Map<Class> getEmbeddableTypeMap() {
return Collections.unmodifiableMap( embeddables );
}
/*package*/ void registerEntityType(PersistentClass persistentClass, EntityTypeImpl<?> entityType) {
entityTypes.put( entityType.getBindableJavaType(), entityType );
entityTypesByEntityName.put( persistentClass.getEntityName(), entityType );
entityTypesByPersistentClass.put( persistentClass, entityType );
orderedMappings.add( persistentClass );
}
/*package*/ void registerEmbeddedableType(EmbeddableTypeImpl<?> embeddableType) {
embeddables.put( embeddableType.getJavaType(), embeddableType );
}
/*package*/ void registerMappedSuperclassType(MappedSuperclass mappedSuperclass,
MappedSuperclassTypeImpl<?> mappedSuperclassType) {
mappedSuperclassByMappedSuperclassMapping.put( mappedSuperclass, mappedSuperclassType );
orderedMappings.add( mappedSuperclass );
mappedSuperClassTypeToPersistentClass.put( mappedSuperclassType, getEntityWorkedOn() );
}
/**
* Given a Hibernate {@link PersistentClass}, locate the corresponding JPA {@link org.hibernate.type.EntityType}
* implementation. May retur null if the given {@link PersistentClass} has not yet been processed.
*
* @param persistentClass The Hibernate (config time) metamodel instance representing an entity.
* @return Tne corresponding JPA {@link org.hibernate.type.EntityType}, or null if not yet processed.
*/
public EntityTypeImpl<?> locateEntityType(PersistentClass persistentClass) {
return entityTypesByPersistentClass.get( persistentClass );
}
/**
* Given a Java {@link Class}, locate the corresponding JPA {@link org.hibernate.type.EntityType}. May
* return null which could means that no such mapping exists at least at this time.
*
* @param javaType The java class.
* @return The corresponding JPA {@link org.hibernate.type.EntityType}, or null.
*/
public EntityTypeImpl<?> locateEntityType(Class javaType) {
return entityTypes.get( javaType );
}
/**
* Given an entity-name, locate the corresponding JPA {@link org.hibernate.type.EntityType}. May
* return null which could means that no such mapping exists at least at this time.
*
* @param entityName The entity-name.
* @return The corresponding JPA {@link org.hibernate.type.EntityType}, or null.
*/
public EntityTypeImpl<?> locateEntityType(String entityName) {
return entityTypesByEntityName.get( entityName );
}
@SuppressWarnings({ "unchecked" })
public void wrapUp() {
LOG.trace("Wrapping up metadata context...");
//we need to process types from superclasses to subclasses
for (Object mapping : orderedMappings) {
if ( PersistentClass.class.isAssignableFrom( mapping.getClass() ) ) {
@SuppressWarnings( "unchecked" )
final PersistentClass safeMapping = (PersistentClass) mapping;
LOG.trace("Starting entity [" + safeMapping.getEntityName() + "]");
try {
final EntityTypeImpl<?> jpa2Mapping = entityTypesByPersistentClass.get( safeMapping );
applyIdMetadata( safeMapping, jpa2Mapping );
applyVersionAttribute( safeMapping, jpa2Mapping );
Iterator<Property> properties = safeMapping.getDeclaredPropertyIterator();
while ( properties.hasNext() ) {
final Property property = properties.next();
if ( property.getValue() == safeMapping.getIdentifierMapper() ) {
// property represents special handling for id-class mappings but we have already
// accounted for the embedded property mappings in #applyIdMetadata &&
// #buildIdClassAttributes
continue;
}
if ( safeMapping.isVersioned() && property == safeMapping.getVersion() ) {
// skip the version property, it was already handled previously.
continue;
}
final Attribute attribute = attributeFactory.buildAttribute( jpa2Mapping, property );
if ( attribute != null ) {
jpa2Mapping.getBuilder().addAttribute( attribute );
}
}
jpa2Mapping.lock();
populateStaticMetamodel( jpa2Mapping );
}
finally {
LOG.trace("Completed entity [" + safeMapping.getEntityName() + "]");
}
}
else if ( MappedSuperclass.class.isAssignableFrom( mapping.getClass() ) ) {
@SuppressWarnings( "unchecked" )
final MappedSuperclass safeMapping = (MappedSuperclass) mapping;
LOG.trace("Starting mapped superclass [" + safeMapping.getMappedClass().getName() + "]");
try {
final MappedSuperclassTypeImpl<?> jpa2Mapping = mappedSuperclassByMappedSuperclassMapping.get(
safeMapping
);
applyIdMetadata( safeMapping, jpa2Mapping );
applyVersionAttribute( safeMapping, jpa2Mapping );
Iterator<Property> properties = safeMapping.getDeclaredPropertyIterator();
while ( properties.hasNext() ) {
final Property property = properties.next();
if ( safeMapping.isVersioned() && property == safeMapping.getVersion() ) {
// skip the version property, it was already handled previously.
continue;
}
final Attribute attribute = attributeFactory.buildAttribute( jpa2Mapping, property );
if ( attribute != null ) {
jpa2Mapping.getBuilder().addAttribute( attribute );
}
}
jpa2Mapping.lock();
populateStaticMetamodel( jpa2Mapping );
}
finally {
LOG.trace("Completed mapped superclass [" + safeMapping.getMappedClass().getName() + "]");
}
}
else {
throw new AssertionFailure( "Unexpected mapping type: " + mapping.getClass() );
}
}
for ( EmbeddableTypeImpl embeddable : embeddables.values() ) {
populateStaticMetamodel( embeddable );
}
}
private <X> void applyIdMetadata(PersistentClass persistentClass, EntityTypeImpl jpaEntityType) {
if ( persistentClass.hasIdentifierProperty() ) {
final Property declaredIdentifierProperty = persistentClass.getDeclaredIdentifierProperty();
if (declaredIdentifierProperty != null) {
jpaEntityType.getBuilder().applyIdAttribute(
attributeFactory.buildIdAttribute( jpaEntityType, declaredIdentifierProperty )
);
}
}
else if ( persistentClass.hasIdentifierMapper() ) {
jpaEntityType.getBuilder().applyIdClassAttributes( buildIdClassAttributes( jpaEntityType, persistentClass ) );
}
else {
final KeyValue value = persistentClass.getIdentifier();
if (value instanceof Component ) {
final Component component = ( Component ) value;
if ( component.getPropertySpan() > 1 ) {
//FIXME we are an Hibernate embedded id (ie not type)
}
else {
//FIXME take care of declared vs non declared property
jpaEntityType.getBuilder().applyIdAttribute(
attributeFactory.buildIdAttribute(
jpaEntityType,
(Property) component.getPropertyIterator().next() )
);
}
}
}
}
private <X> void applyIdMetadata(MappedSuperclass mappingType, MappedSuperclassTypeImpl jpaMappingType) {
if ( mappingType.hasIdentifierProperty() ) {
final Property declaredIdentifierProperty = mappingType.getDeclaredIdentifierProperty();
if (declaredIdentifierProperty != null) {
jpaMappingType.getBuilder().applyIdAttribute(
attributeFactory.buildIdAttribute( jpaMappingType, declaredIdentifierProperty )
);
}
}
//an MappedSuperclass can have no identifier if the id is set below in the hierarchy
else if ( mappingType.getIdentifierMapper() != null ){
final Set<SingularAttribute attributes = buildIdClassAttributes(
jpaMappingType, mappingType
);
jpaMappingType.getBuilder().applyIdClassAttributes( attributes );
}
}
private <X> void applyVersionAttribute(PersistentClass persistentClass, EntityTypeImpl jpaEntityType) {
final Property declaredVersion = persistentClass.getDeclaredVersion();
if (declaredVersion != null) {
jpaEntityType.getBuilder().applyVersionAttribute(
attributeFactory.buildVersionAttribute( jpaEntityType, declaredVersion )
);
}
}
private <X> void applyVersionAttribute(MappedSuperclass mappingType, MappedSuperclassTypeImpl jpaMappingType) {
final Property declaredVersion = mappingType.getDeclaredVersion();
if ( declaredVersion != null ) {
jpaMappingType.getBuilder().applyVersionAttribute(
attributeFactory.buildVersionAttribute( jpaMappingType, declaredVersion )
);
}
}
private <X> Set> buildIdClassAttributes(
EntityTypeImpl<X> jpaEntityType,
PersistentClass persistentClass) {
Set<SingularAttribute attributes = new HashSet>();
@SuppressWarnings( "unchecked")
Iterator<Property> properties = persistentClass.getIdentifierMapper().getPropertyIterator();
while ( properties.hasNext() ) {
attributes.add( attributeFactory.buildIdAttribute( jpaEntityType, properties.next() ) );
}
return attributes;
}
private <X> Set> buildIdClassAttributes(
MappedSuperclassTypeImpl<X> jpaMappingType,
MappedSuperclass mappingType) {
LOG.trace("Building old-school composite identifier [" + mappingType.getMappedClass().getName() + "]");
Set<SingularAttribute attributes = new HashSet>();
@SuppressWarnings( "unchecked" )
Iterator<Property> properties = mappingType.getIdentifierMapper().getPropertyIterator();
while ( properties.hasNext() ) {
attributes.add( attributeFactory.buildIdAttribute( jpaMappingType, properties.next() ) );
}
return attributes;
}
private <X> void populateStaticMetamodel(AbstractManagedType managedType) {
final Class<X> managedTypeClass = managedType.getJavaType();
final String metamodelClassName = managedTypeClass.getName() + "_";
try {
final Class metamodelClass = Class.forName( metamodelClassName, true, managedTypeClass.getClassLoader() );
// we found the class; so populate it...
registerAttributes( metamodelClass, managedType );
}
catch ( ClassNotFoundException ignore ) {
// nothing to do...
}
// todo : this does not account for @MappeSuperclass, mainly because this is not being tracked in our
// internal metamodel as populated from the annotatios properly
AbstractManagedType<? super X> superType = managedType.getSupertype();
if ( superType != null ) {
populateStaticMetamodel( superType );
}
}
private final Set<Class> processedMetamodelClasses = new HashSet();
private <X> void registerAttributes(Class metamodelClass, AbstractManagedType managedType) {
if ( ! processedMetamodelClasses.add( metamodelClass ) ) {
return;
}
// push the attributes on to the metamodel class...
for ( Attribute<X, ?> attribute : managedType.getDeclaredAttributes() ) {
registerAttribute( metamodelClass, attribute );
}
if ( IdentifiableType.class.isInstance( managedType ) ) {
final AbstractIdentifiableType<X> entityType = ( AbstractIdentifiableType ) managedType;
// handle version
if ( entityType.hasDeclaredVersionAttribute() ) {
registerAttribute( metamodelClass, entityType.getDeclaredVersion() );
}
// handle id-class mappings specially
if ( ! entityType.hasSingleIdAttribute() ) {
final Set<SingularAttribute attributes = entityType.getIdClassAttributes();
if ( attributes != null ) {
for ( SingularAttribute<? super X, ?> attribute : attributes ) {
registerAttribute( metamodelClass, attribute );
}
}
}
}
}
private <X> void registerAttribute(Class metamodelClass, Attribute attribute) {
final String name = attribute.getName();
try {
Field field = metamodelClass.getDeclaredField( name );
try {
if ( ! field.isAccessible() ) {
// should be public anyway, but to be sure...
field.setAccessible( true );
}
field.set( null, attribute );
}
catch ( IllegalAccessException e ) {
// todo : exception type?
throw new AssertionFailure(
"Unable to inject static metamodel attribute : " + metamodelClass.getName() + '#' + name,
e
);
}
catch ( IllegalArgumentException e ) {
// most likely a mismatch in the type we are injecting and the defined field; this represents a
// mismatch in how the annotation processor interpretted the attribute and how our metamodel
// and/or annotation binder did.
// This is particularly the case as arrays are nto handled propery by the StaticMetamodel generator
// throw new AssertionFailure(
// "Illegal argument on static metamodel field injection : " + metamodelClass.getName() + '#' + name
// + "; expected type : " + attribute.getClass().getName()
// + "; encountered type : " + field.getType().getName()
// );
LOG.illegalArgumentOnStaticMetamodelFieldInjection(metamodelClass.getName(),
name,
attribute.getClass().getName(),
field.getType().getName());
}
}
catch ( NoSuchFieldException e ) {
LOG.unableToLocateStaticMetamodelField(metamodelClass.getName(), name);
// throw new AssertionFailure(
// "Unable to locate static metamodel field : " + metamodelClass.getName() + '#' + name
// );
}
}
public MappedSuperclassTypeImpl<?> locateMappedSuperclassType(MappedSuperclass mappedSuperclass) {
return mappedSuperclassByMappedSuperclassMapping.get(mappedSuperclass);
}
public void pushEntityWorkedOn(PersistentClass persistentClass) {
stackOfPersistentClassesBeingProcessed.add(persistentClass);
}
public void popEntityWorkedOn(PersistentClass persistentClass) {
final PersistentClass stackTop = stackOfPersistentClassesBeingProcessed.remove(
stackOfPersistentClassesBeingProcessed.size() - 1
);
if (stackTop != persistentClass) {
throw new AssertionFailure( "Inconsistent popping: "
+ persistentClass.getEntityName() + " instead of " + stackTop.getEntityName() );
}
}
private PersistentClass getEntityWorkedOn() {
return stackOfPersistentClassesBeingProcessed.get(
stackOfPersistentClassesBeingProcessed.size() - 1
);
}
public PersistentClass getPersistentClassHostingProperties(MappedSuperclassTypeImpl<?> mappedSuperclassType) {
final PersistentClass persistentClass = mappedSuperClassTypeToPersistentClass.get( mappedSuperclassType );
if (persistentClass == null) {
throw new AssertionFailure( "Could not find PersistentClass for MappedSuperclassType: "
+ mappedSuperclassType.getJavaType() );
}
return persistentClass;
}
}
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