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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, Red Hat Inc. 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 Inc.
*
* 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.engine.internal;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.internal.util.StringHelper;
import org.hibernate.internal.util.collections.ArrayHelper;
import org.hibernate.persister.entity.Joinable;
import org.hibernate.persister.entity.OuterJoinLoadable;
import org.hibernate.persister.entity.PropertyMapping;
import org.hibernate.type.AssociationType;
/**
* @author Gavin King
*/
public final class JoinHelper {
private JoinHelper() {}
/**
* Get the aliased columns of the owning entity which are to
* be used in the join
*/
public static String[] getAliasedLHSColumnNames(
AssociationType type,
String alias,
int property,
OuterJoinLoadable lhsPersister,
Mapping mapping
) {
return getAliasedLHSColumnNames(type, alias, property, 0, lhsPersister, mapping);
}
/**
* Get the columns of the owning entity which are to
* be used in the join
*/
public static String[] getLHSColumnNames(
AssociationType type,
int property,
OuterJoinLoadable lhsPersister,
Mapping mapping
) {
return getLHSColumnNames(type, property, 0, lhsPersister, mapping);
}
/**
* Get the aliased columns of the owning entity which are to
* be used in the join
*/
public static String[] getAliasedLHSColumnNames(
AssociationType associationType,
String columnQualifier,
int propertyIndex,
int begin,
OuterJoinLoadable lhsPersister,
Mapping mapping) {
if ( associationType.useLHSPrimaryKey() ) {
return StringHelper.qualify( columnQualifier, lhsPersister.getIdentifierColumnNames() );
}
else {
String propertyName = associationType.getLHSPropertyName();
if ( propertyName == null ) {
return ArrayHelper.slice(
toColumns( lhsPersister, columnQualifier, propertyIndex ),
begin,
associationType.getColumnSpan( mapping )
);
}
else {
return ( (PropertyMapping) lhsPersister ).toColumns(columnQualifier, propertyName); //bad cast
}
}
}
private static String[] toColumns(OuterJoinLoadable persister, String columnQualifier, int propertyIndex) {
if ( propertyIndex >= 0 ) {
return persister.toColumns( columnQualifier, propertyIndex );
}
else {
final String[] cols = persister.getIdentifierColumnNames();
final String[] result = new String[cols.length];
for ( int j = 0; j < cols.length; j++ ) {
result[j] = StringHelper.qualify( columnQualifier, cols[j] );
}
return result;
}
}
/**
* Get the columns of the owning entity which are to
* be used in the join
*/
public static String[] getLHSColumnNames(
AssociationType type,
int property,
int begin,
OuterJoinLoadable lhsPersister,
Mapping mapping
) {
if ( type.useLHSPrimaryKey() ) {
//return lhsPersister.getSubclassPropertyColumnNames(property);
return lhsPersister.getIdentifierColumnNames();
}
else {
String propertyName = type.getLHSPropertyName();
if (propertyName==null) {
//slice, to get the columns for this component
//property
return ArrayHelper.slice(
property < 0
? lhsPersister.getIdentifierColumnNames()
: lhsPersister.getSubclassPropertyColumnNames(property),
begin,
type.getColumnSpan(mapping)
);
}
else {
//property-refs for associations defined on a
//component are not supported, so no need to slice
return lhsPersister.getPropertyColumnNames(propertyName);
}
}
}
public static String getLHSTableName(
AssociationType type,
int propertyIndex,
OuterJoinLoadable lhsPersister) {
if ( type.useLHSPrimaryKey() || propertyIndex < 0 ) {
return lhsPersister.getTableName();
}
else {
String propertyName = type.getLHSPropertyName();
if (propertyName==null) {
//if there is no property-ref, assume the join
//is to the subclass table (ie. the table of the
//subclass that the association belongs to)
return lhsPersister.getSubclassPropertyTableName(propertyIndex);
}
else {
//handle a property-ref
String propertyRefTable = lhsPersister.getPropertyTableName(propertyName);
if (propertyRefTable==null) {
//it is possible that the tree-walking in OuterJoinLoader can get to
//an association defined by a subclass, in which case the property-ref
//might refer to a property defined on a subclass of the current class
//in this case, the table name is not known - this temporary solution
//assumes that the property-ref refers to a property of the subclass
//table that the association belongs to (a reasonable guess)
//TODO: fix this, add: OuterJoinLoadable.getSubclassPropertyTableName(String propertyName)
propertyRefTable = lhsPersister.getSubclassPropertyTableName(propertyIndex);
}
return propertyRefTable;
}
}
}
/**
* Get the columns of the associated table which are to
* be used in the join
*/
public static String[] getRHSColumnNames(AssociationType type, SessionFactoryImplementor factory) {
String uniqueKeyPropertyName = type.getRHSUniqueKeyPropertyName();
Joinable joinable = type.getAssociatedJoinable(factory);
if (uniqueKeyPropertyName==null) {
return joinable.getKeyColumnNames();
}
else {
return ( (OuterJoinLoadable) joinable ).getPropertyColumnNames(uniqueKeyPropertyName);
}
}
}
