//$Id: ManyToOneType.java 10020 2006-06-15 16:38:03Z [email protected] $
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.EntityKey;
import org.hibernate.engine.ForeignKeys;
import org.hibernate.engine.Mapping;
import org.hibernate.engine.SessionImplementor;
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;
public ManyToOneType(String className) {
this( className, false );
}
public ManyToOneType(String className, boolean lazy) {
super( className, null, !lazy, true, false );
this.ignoreNotFound = false;
}
public ManyToOneType(
String entityName,
String uniqueKeyPropertyName,
boolean lazy,
boolean unwrapProxy,
boolean isEmbeddedInXML,
boolean ignoreNotFound) {
super( entityName, uniqueKeyPropertyName, !lazy, isEmbeddedInXML, unwrapProxy );
this.ignoreNotFound = ignoreNotFound;
}
protected boolean isNullable() {
return ignoreNotFound;
}
public boolean isAlwaysDirtyChecked() {
// If we have <tt>not-found="ignore"</tt> association mapped to a
// formula, we always need to dirty check it, so we can update the
// second-level cache
return ignoreNotFound;
}
public boolean isOneToOne() {
return false;
}
public int getColumnSpan(Mapping mapping) throws MappingException {
// our column span is the number of columns in the PK
return getIdentifierOrUniqueKeyType( mapping ).getColumnSpan( mapping );
}
public int[] sqlTypes(Mapping mapping) throws MappingException {
return getIdentifierOrUniqueKeyType( mapping ).sqlTypes( mapping );
}
public void nullSafeSet(
PreparedStatement st,
Object value,
int index,
boolean[] settable,
SessionImplementor session) throws HibernateException, SQLException {
getIdentifierOrUniqueKeyType( session.getFactory() )
.nullSafeSet( st, getIdentifier( value, session ), index, settable, session );
}
public void nullSafeSet(
PreparedStatement st,
Object value,
int index,
SessionImplementor session) throws HibernateException, SQLException {
getIdentifierOrUniqueKeyType( session.getFactory() )
.nullSafeSet( st, getIdentifier( value, session ), index, session );
}
public ForeignKeyDirection getForeignKeyDirection() {
return ForeignKeyDirection.FOREIGN_KEY_FROM_PARENT;
}
public Object hydrate(
ResultSet rs,
String[] names,
SessionImplementor 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!
Serializable id = (Serializable) getIdentifierOrUniqueKeyType( session.getFactory() )
.nullSafeGet( rs, names, session, null );
scheduleBatchLoadIfNeeded( id, session );
return id;
}
/**
* Register the entity as batch loadable, if enabled
*/
private void scheduleBatchLoadIfNeeded(
Serializable id,
SessionImplementor session) throws MappingException {
//cannot batch fetch by unique key (property-ref associations)
if ( uniqueKeyPropertyName == null && id != null ) {
EntityPersister persister = session.getFactory().getEntityPersister( getAssociatedEntityName() );
EntityKey entityKey = new EntityKey( id, persister, session.getEntityMode() );
if ( !session.getPersistenceContext().containsEntity( entityKey ) ) {
session.getPersistenceContext()
.getBatchFetchQueue()
.addBatchLoadableEntityKey( entityKey );
}
}
}
public boolean useLHSPrimaryKey() {
return false;
}
public boolean isModified(
Object old,
Object current,
boolean[] checkable,
SessionImplementor 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 );
}
public Serializable disassemble(
Object value,
SessionImplementor session,
Object owner) throws HibernateException {
if ( isNotEmbedded( session ) ) {
return getIdentifierType( session ).disassemble( value, session, owner );
}
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 );
}
}
public Object assemble(
Serializable oid,
SessionImplementor 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 ( isNotEmbedded( session ) ) {
return id;
}
if ( id == null ) {
return null;
}
else {
return resolveIdentifier( id, session );
}
}
private Serializable assembleId(Serializable oid, SessionImplementor session) {
//the owner of the association is not the owner of the id
return ( Serializable ) getIdentifierType( session ).assemble( oid, session, null );
}
public void beforeAssemble(Serializable oid, SessionImplementor session) {
scheduleBatchLoadIfNeeded( assembleId( oid, session ), session );
}
public boolean[] toColumnNullness(Object value, Mapping mapping) {
boolean[] result = new boolean[ getColumnSpan( mapping ) ];
if ( value != null ) {
Arrays.fill( result, true );
}
return result;
}
public boolean isDirty(
Object old,
Object current,
SessionImplementor session) throws HibernateException {
if ( isSame( old, current, session.getEntityMode() ) ) {
return false;
}
Object oldid = getIdentifier( old, session );
Object newid = getIdentifier( current, session );
return getIdentifierType( session ).isDirty( oldid, newid, session );
}
public boolean isDirty(
Object old,
Object current,
boolean[] checkable,
SessionImplementor session) throws HibernateException {
if ( isAlwaysDirtyChecked() ) {
return isDirty( old, current, session );
}
else {
if ( isSame( old, current, session.getEntityMode() ) ) {
return false;
}
Object oldid = getIdentifier( old, session );
Object newid = getIdentifier( current, session );
return getIdentifierType( session ).isDirty( oldid, newid, checkable, session );
}
}
}
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