/*
* Copyright 2002-2011 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.flex.hibernate4;
import org.hibernate.Hibernate;
import org.hibernate.collection.spi.PersistentCollection;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.ConverterFactory;
/**
* {@link ConverterFactory} implementation that supplies a {@link Converter} instance that can convert {@link PersistentCollection}
* instances from Hibernate. Given a specific {@code PersistentCollection} instance, the converter will:
*
* <ul>
* <li>Convert to null if the {@code PersistentCollection} instance is uninitialized</li>
* <li>Convert to the wrapped collection class if the {@code PersistentCollection} is initialized</li>
* </ul>
*
* @author Jeremy Grelle
*/
public class PersistentCollectionConverterFactory implements ConverterFactory<PersistentCollection, Object> {
public <T> Converter<PersistentCollection, T> getConverter(Class<T> targetType) {
return new Converter<PersistentCollection, T>() {
@SuppressWarnings("unchecked")
public T convert(PersistentCollection source) {
if (!Hibernate.isInitialized(source)) {
return null;
} else {
return (T) source.getValue();
}
}
};
}
}