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The core O/RM functionality as provided by Hibernate
/*
* 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 .
*/
package org.hibernate.type;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.hibernate.HibernateException;
import org.hibernate.collection.internal.PersistentMap;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.persister.collection.CollectionPersister;
public class MapType extends CollectionType {
public MapType(TypeFactory.TypeScope typeScope, String role, String propertyRef) {
super( typeScope, role, propertyRef );
}
@Override
public PersistentCollection instantiate(
SharedSessionContractImplementor session,
CollectionPersister persister,
Serializable key) {
return new PersistentMap( session );
}
@Override
public Class getReturnedClass() {
return Map.class;
}
@Override
public Iterator getElementsIterator(Object collection) {
return ( (java.util.Map) collection ).values().iterator();
}
@Override
public PersistentCollection wrap(SharedSessionContractImplementor session, Object collection) {
return new PersistentMap( session, (java.util.Map) collection );
}
@Override
public Object instantiate(int anticipatedSize) {
return anticipatedSize <= 0
? new HashMap()
: new HashMap( anticipatedSize + (int) ( anticipatedSize * .75f ), .75f );
}
@Override
public Object replaceElements(
final Object original,
final Object target,
final Object owner,
final java.util.Map copyCache,
final SharedSessionContractImplementor session) throws HibernateException {
CollectionPersister cp = session.getFactory().getMetamodel().collectionPersister( getRole() );
java.util.Map result = (java.util.Map) target;
result.clear();
for ( Object o : ( (Map) original ).entrySet() ) {
Map.Entry me = (Map.Entry) o;
Object key = cp.getIndexType().replace( me.getKey(), null, session, owner, copyCache );
Object value = cp.getElementType().replace( me.getValue(), null, session, owner, copyCache );
result.put( key, value );
}
return result;
}
@Override
public Object indexOf(Object collection, Object element) {
for ( Object o : ( (Map) collection ).entrySet() ) {
Map.Entry me = (Map.Entry) o;
//TODO: proxies!
if ( me.getValue() == element ) {
return me.getKey();
}
}
return null;
}
}