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This Jackrabbit subproject is an object/JCR persistence and query service. This tools lets you to persist java objects into a JCR compliant repository - including association, inheritance, polymorphism, composition, and the Java collections framework. Furthermore, this jcr-mapping allows you to express queries in Java-based Criteria, as well as in JCR query language. It offers also features like version support and object locking.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.jackrabbit.ocm.manager.collectionconverter;

import javax.jcr.Node;
import javax.jcr.Session;

import org.apache.jackrabbit.ocm.exception.ObjectContentManagerException;
import org.apache.jackrabbit.ocm.mapper.model.CollectionDescriptor;

/**
 * Convert any kind of {@link ManageableObjects} into severals JCR nodes.
 *
 * @author Lombart Christophe 
 *
 */
public interface CollectionConverter
{

	/**
	 * Insert/convert collection elements (a Collection or a Map) into some JCR nodes
	 * @param session The JCR session
	 * @param parentNode the node which will contains the collection element
	 * @param collectionDescriptor The collection descriptor
	 * @param objects The objects to insert
	 *
	 * @throws ObjectContentManagerException when it is not possible to insert the collection
	 *
	 */
	public void insertCollection(Session session, Node parentNode,
			                     CollectionDescriptor collectionDescriptor, ManageableObjects objects) throws ObjectContentManagerException;

	/**
	 * Update collection elements (a Collection or a Map) already present in the JCR repository
	 * @param session The JCR session
	 * @param parentNode the node which will contains the collection element
	 * @param collectionDescriptor The collection descriptor
	 * @param objects The objects to update
	 *
	 * @throws ObjectContentManagerException when it is not possible to update the collection
	 */
	public void updateCollection(Session session, Node parentNode,
			                     CollectionDescriptor collectionDescriptor, ManageableObjects objects) throws ObjectContentManagerException;

	/**
	 * Get a {@link ManageableObjects} from the JCR repository
	 * @param session The JCR session
	 * @param parentNode the node which contains the collection element
	 * @param collectionDescriptor The collection descriptor
	 * @param collectionFieldClass The collection class to used (ArrayList, Vector, ..)
	 * @return The collection or a map populates with all elements found in the JCR repository
	 *
	 * @throws ObjectContentManagerException when it is not possible to retrieve the collection
	 */
	public ManageableObjects getCollection(Session session, Node parentNode,
			                                  CollectionDescriptor collectionDescriptor, Class collectionFieldClass) throws ObjectContentManagerException;


	/**
	 * Check if the collection is null. This method is mainly used in the Proxy manager to return a null value or a proxy object
	 * Without proxy proxy, this method is never called.
	 *
	 * @param session The JCR session
	 * @param parentNode the node which contains the collection element
	 * @param collectionDescriptor The collection descriptor
	 * @param collectionFieldClass The collection class to used (ArrayList, Vector, ..)
	 * @return true if the collection contains elements.
	 *
	 *
	 * @throws ObjectContentManagerException when it is not possible to retrieve the collection
	 */
	public boolean isNull(Session session, Node parentNode,
                                      CollectionDescriptor collectionDescriptor, Class collectionFieldClass) throws ObjectContentManagerException;
}