/*
 * 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
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
/** * 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<descriptors.length; i++ ) { descriptors[i] = new DefaultEntityAliases( persisters[i], suffixes[i] ); } CollectionPersister[] collectionPersisters = getCollectionPersisters(); List bagRoles = null; if ( collectionPersisters != null ) { String[] collectionSuffixes = getCollectionSuffixes(); collectionDescriptors = new CollectionAliases[collectionPersisters.length]; for ( int i = 0; i < collectionPersisters.length; i++ ) { if ( isBag( collectionPersisters[i] ) ) { if ( bagRoles == null ) { bagRoles = new ArrayList(); } bagRoles.add( collectionPersisters[i].getRole() ); } collectionDescriptors[i] = new GeneratedCollectionAliases( collectionPersisters[i], collectionSuffixes[i] ); } } else { collectionDescriptors = null; } if ( bagRoles != null && bagRoles.size() > 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.
Params:
  • length – The number of suffixes to generate
Returns:The array of generated suffixes (with length=length).
/** * 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 ) + "_").intern(); } return suffixes; } }