org.hibernate.loader.BasicLoader Maven / Gradle / Ivy
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//$Id: BasicLoader.java 9870 2006-05-04 11:57:58Z [email protected] $
package org.hibernate.loader;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.persister.entity.Loadable;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.type.BagType;
import org.hibernate.HibernateException;
/**
* 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 HibernateException( "cannot simultaneously fetch multiple bags" );
}
}
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.
*/
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;
}
}