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org.hibernate.type.ManyToOneType Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.type;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import org.hibernate.AssertionFailure;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.engine.internal.ForeignKeys;
import org.hibernate.engine.jdbc.Size;
import org.hibernate.engine.spi.EntityKey;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.persister.entity.EntityPersister;
/**
* A many-to-one association to an entity.
*
* @author Gavin King
*/
public class ManyToOneType extends EntityType {
private final boolean ignoreNotFound;
private boolean isLogicalOneToOne;
/**
* Creates a many-to-one association type with the given referenced entity.
*
* @param scope The scope for this instance.
* @param referencedEntityName The name iof the referenced entity
*/
public ManyToOneType(TypeFactory.TypeScope scope, String referencedEntityName) {
this( scope, referencedEntityName, false );
}
/**
* Creates a many-to-one association type with the given referenced entity and the
* given laziness characteristic
*
* @param scope The scope for this instance.
* @param referencedEntityName The name iof the referenced entity
* @param lazy Should the association be handled lazily
*/
public ManyToOneType(TypeFactory.TypeScope scope, String referencedEntityName, boolean lazy) {
this( scope, referencedEntityName, true, null, lazy, true, false, false );
}
/**
* @deprecated Use {@link #ManyToOneType(TypeFactory.TypeScope, String, boolean, String, boolean, boolean, boolean, boolean ) } instead.
*/
@Deprecated
public ManyToOneType(
TypeFactory.TypeScope scope,
String referencedEntityName,
String uniqueKeyPropertyName,
boolean lazy,
boolean unwrapProxy,
boolean isEmbeddedInXML,
boolean ignoreNotFound,
boolean isLogicalOneToOne) {
this( scope, referencedEntityName, uniqueKeyPropertyName == null, uniqueKeyPropertyName, lazy, unwrapProxy, ignoreNotFound, isLogicalOneToOne );
}
public ManyToOneType(
TypeFactory.TypeScope scope,
String referencedEntityName,
boolean referenceToPrimaryKey,
String uniqueKeyPropertyName,
boolean lazy,
boolean unwrapProxy,
boolean ignoreNotFound,
boolean isLogicalOneToOne) {
super( scope, referencedEntityName, referenceToPrimaryKey, uniqueKeyPropertyName, !lazy, unwrapProxy );
this.ignoreNotFound = ignoreNotFound;
this.isLogicalOneToOne = isLogicalOneToOne;
}
@Override
protected boolean isNullable() {
return ignoreNotFound;
}
@Override
public boolean isAlwaysDirtyChecked() {
// always need to dirty-check, even when non-updateable;
// this ensures that when the association is updated,
// the entity containing this association will be updated
// in the cache
return true;
}
@Override
public boolean isOneToOne() {
return false;
}
@Override
public boolean isLogicalOneToOne() {
return isLogicalOneToOne;
}
@Override
public int getColumnSpan(Mapping mapping) throws MappingException {
return requireIdentifierOrUniqueKeyType( mapping ).getColumnSpan( mapping );
}
private Type requireIdentifierOrUniqueKeyType(Mapping mapping) {
final Type fkTargetType = getIdentifierOrUniqueKeyType( mapping );
if ( fkTargetType == null ) {
throw new MappingException(
"Unable to determine FK target Type for many-to-one mapping: " +
"referenced-entity-name=[" + getAssociatedEntityName() +
"], referenced-entity-attribute-name=[" + getLHSPropertyName() + "]"
);
}
return fkTargetType;
}
@Override
public int[] sqlTypes(Mapping mapping) throws MappingException {
return requireIdentifierOrUniqueKeyType( mapping ).sqlTypes( mapping );
}
@Override
public Size[] dictatedSizes(Mapping mapping) throws MappingException {
return requireIdentifierOrUniqueKeyType( mapping ).dictatedSizes( mapping );
}
@Override
public Size[] defaultSizes(Mapping mapping) throws MappingException {
return requireIdentifierOrUniqueKeyType( mapping ).defaultSizes( mapping );
}
@Override
public void nullSafeSet(
PreparedStatement st,
Object value,
int index,
boolean[] settable,
SharedSessionContractImplementor session) throws HibernateException, SQLException {
requireIdentifierOrUniqueKeyType( session.getFactory() )
.nullSafeSet( st, getIdentifier( value, session ), index, settable, session );
}
@Override
public void nullSafeSet(
PreparedStatement st,
Object value,
int index,
SharedSessionContractImplementor session) throws HibernateException, SQLException {
requireIdentifierOrUniqueKeyType( session.getFactory() )
.nullSafeSet( st, getIdentifier( value, session ), index, session );
}
@Override
public ForeignKeyDirection getForeignKeyDirection() {
return ForeignKeyDirection.FROM_PARENT;
}
@Override
public Object hydrate(
ResultSet rs,
String[] names,
SharedSessionContractImplementor session,
Object owner) throws HibernateException, SQLException {
// return the (fully resolved) identifier value, but do not resolve
// to the actual referenced entity instance
// NOTE: the owner of the association is not really the owner of the id!
final Serializable id = (Serializable) getIdentifierOrUniqueKeyType( session.getFactory() )
.nullSafeGet( rs, names, session, null );
scheduleBatchLoadIfNeeded( id, session );
return id;
}
/**
* Register the entity as batch loadable, if enabled
*/
@SuppressWarnings({ "JavaDoc" })
private void scheduleBatchLoadIfNeeded(Serializable id, SharedSessionContractImplementor session) throws MappingException {
//cannot batch fetch by unique key (property-ref associations)
if ( uniqueKeyPropertyName == null && id != null ) {
final EntityPersister persister = getAssociatedEntityPersister( session.getFactory() );
if ( persister.isBatchLoadable() ) {
final EntityKey entityKey = session.generateEntityKey( id, persister );
if ( !session.getPersistenceContext().containsEntity( entityKey ) ) {
session.getPersistenceContext().getBatchFetchQueue().addBatchLoadableEntityKey( entityKey );
}
}
}
}
@Override
public boolean useLHSPrimaryKey() {
return false;
}
@Override
public boolean isModified(
Object old,
Object current,
boolean[] checkable,
SharedSessionContractImplementor session) throws HibernateException {
if ( current == null ) {
return old!=null;
}
if ( old == null ) {
// we already know current is not null...
return true;
}
// the ids are fully resolved, so compare them with isDirty(), not isModified()
return getIdentifierOrUniqueKeyType( session.getFactory() )
.isDirty( old, getIdentifier( current, session ), session );
}
@Override
public Serializable disassemble(
Object value,
SharedSessionContractImplementor session,
Object owner) throws HibernateException {
if ( value == null ) {
return null;
}
else {
// cache the actual id of the object, not the value of the
// property-ref, which might not be initialized
Object id = ForeignKeys.getEntityIdentifierIfNotUnsaved(
getAssociatedEntityName(),
value,
session
);
if ( id == null ) {
throw new AssertionFailure(
"cannot cache a reference to an object with a null id: " +
getAssociatedEntityName()
);
}
return getIdentifierType( session ).disassemble( id, session, owner );
}
}
@Override
public Object assemble(
Serializable oid,
SharedSessionContractImplementor session,
Object owner) throws HibernateException {
//TODO: currently broken for unique-key references (does not detect
// change to unique key property of the associated object)
Serializable id = assembleId( oid, session );
if ( id == null ) {
return null;
}
else {
return resolveIdentifier( id, session );
}
}
private Serializable assembleId(Serializable oid, SharedSessionContractImplementor session) {
//the owner of the association is not the owner of the id
return ( Serializable ) getIdentifierType( session ).assemble( oid, session, null );
}
@Override
public void beforeAssemble(Serializable oid, SharedSessionContractImplementor session) {
scheduleBatchLoadIfNeeded( assembleId( oid, session ), session );
}
@Override
public boolean[] toColumnNullness(Object value, Mapping mapping) {
boolean[] result = new boolean[ getColumnSpan( mapping ) ];
if ( value != null ) {
Arrays.fill( result, true );
}
return result;
}
@Override
public boolean isDirty(
Object old,
Object current,
SharedSessionContractImplementor session) throws HibernateException {
if ( isSame( old, current ) ) {
return false;
}
Object oldid = getIdentifier( old, session );
Object newid = getIdentifier( current, session );
return getIdentifierType( session ).isDirty( oldid, newid, session );
}
@Override
public boolean isDirty(
Object old,
Object current,
boolean[] checkable,
SharedSessionContractImplementor session) throws HibernateException {
if ( isAlwaysDirtyChecked() ) {
return isDirty( old, current, session );
}
else {
if ( isSame( old, current ) ) {
return false;
}
Object oldid = getIdentifier( old, session );
Object newid = getIdentifier( current, session );
return getIdentifierType( session ).isDirty( oldid, newid, checkable, session );
}
}
}
