/*
* Copyright (C) 2015 Red Hat, Inc. and/or its affiliates.
*
* 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.jboss.errai.jpa.client.local;
import javax.persistence.metamodel.PluralAttribute;
/**
* Extends the JPA PluralAttribute interface with methods required by Errai
* persistence but missing from the JPA metamodel. Most importantly, this
* interface provides methods for reading and writing the attribute value.
*
* @param <X>
* The type containing the represented attribute
* @param <C>
* The collection type of the represented attribute
* @param <E>
* The element type of the represented collection attribute
* @author Jonathan Fuerth <jfuerth@gmail.com>
*/
public interface ErraiPluralAttribute<X, C, E> extends ErraiAttribute<X, C>, PluralAttribute<X, C, E> {
/**
* Creates a new, empty collection of a type that is assignable to this
* attribute via the {@link #set(Object, Object)} method. Note that the
* returned type is not necessarily a subtype of java.util.Collection: it
* could also be a java.util.Map.
*
* @return A new collection instance that is type-compatible with this
* attribute's collection type.
* @see #getCollectionType()
*/
C createEmptyCollection();
}