package org.hibernate.tuple;
import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;
import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.util.FastHashMap;
/**
* Centralizes handling of {@link EntityMode} to {@link Tuplizer} mappings.
*
* @author Steve Ebersole
*/
public abstract class EntityModeToTuplizerMapping implements Serializable {
// map of EntityMode -> Tuplizer
private final Map tuplizers;
public EntityModeToTuplizerMapping() {
tuplizers = new FastHashMap();
}
public EntityModeToTuplizerMapping(Map tuplizers) {
this.tuplizers = tuplizers;
}
protected void addTuplizer(EntityMode entityMode, Tuplizer tuplizer) {
tuplizers.put( entityMode, tuplizer );
}
/**
* Given a supposed instance of an entity/component, guess its entity mode.
*
* @param object The supposed instance of the entity/component.
* @return The guessed entity mode.
*/
public EntityMode guessEntityMode(Object object) {
Iterator itr = tuplizers.entrySet().iterator();
while( itr.hasNext() ) {
Map.Entry entry = ( Map.Entry ) itr.next();
Tuplizer tuplizer = ( Tuplizer ) entry.getValue();
if ( tuplizer.isInstance( object ) ) {
return ( EntityMode ) entry.getKey();
}
}
return null;
}
/**
* Locate the contained tuplizer responsible for the given entity-mode. If
* no such tuplizer is defined on this mapping, then return null.
*
* @param entityMode The entity-mode for which the caller wants a tuplizer.
* @return The tuplizer, or null if not found.
*/
public Tuplizer getTuplizerOrNull(EntityMode entityMode) {
return ( Tuplizer ) tuplizers.get( entityMode );
}
/**
* Locate the tuplizer contained within this mapping which is responsible
* for the given entity-mode. If no such tuplizer is defined on this
* mapping, then an exception is thrown.
*
* @param entityMode The entity-mode for which the caller wants a tuplizer.
* @return The tuplizer.
* @throws HibernateException Unable to locate the requested tuplizer.
*/
public Tuplizer getTuplizer(EntityMode entityMode) {
Tuplizer tuplizer = getTuplizerOrNull( entityMode );
if ( tuplizer == null ) {
throw new HibernateException( "No tuplizer found for entity-mode [" + entityMode + "]");
}
return tuplizer;
}
}
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