org.hibernate.loader.BasicLoader Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, 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.loader;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.persister.entity.Loadable;
import org.hibernate.type.BagType;
/**
* Uses the default mapping from property to result set column
* alias defined by the entities' persisters. Used when Hibernate
* is generating result set column aliases.
*
* @author Gavin King
*/
public abstract class BasicLoader extends Loader {
protected static final String[] NO_SUFFIX = {""};
private EntityAliases[] descriptors;
private CollectionAliases[] collectionDescriptors;
public BasicLoader(SessionFactoryImplementor factory) {
super(factory);
}
protected final EntityAliases[] getEntityAliases() {
return descriptors;
}
protected final CollectionAliases[] getCollectionAliases() {
return collectionDescriptors;
}
protected abstract String[] getSuffixes();
protected abstract String[] getCollectionSuffixes();
protected void postInstantiate() {
Loadable[] persisters = getEntityPersisters();
String[] suffixes = getSuffixes();
descriptors = new EntityAliases[persisters.length];
for ( int i=0; i 1 ) {
throw new MultipleBagFetchException( bagRoles );
}
}
private boolean isBag(CollectionPersister collectionPersister) {
return collectionPersister.getCollectionType().getClass().isAssignableFrom( BagType.class );
}
/**
* Utility method that generates 0_, 1_ suffixes. Subclasses don't
* necessarily need to use this algorithm, but it is intended that
* they will in most cases.
*
* @param length The number of suffixes to generate
*
* @return The array of generated suffixes (with length=length).
*/
public static String[] generateSuffixes(int length) {
return generateSuffixes( 0, length );
}
public static String[] generateSuffixes(int seed, int length) {
if ( length == 0 ) return NO_SUFFIX;
String[] suffixes = new String[length];
for ( int i = 0; i < length; i++ ) {
suffixes[i] = Integer.toString( i + seed ) + "_";
}
return suffixes;
}
}