/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.envers.entities.mapper.relation.lazy.initializor;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.entities.mapper.relation.MiddleComponentData;
import org.hibernate.envers.entities.mapper.relation.query.RelationQueryGenerator;
import org.hibernate.envers.reader.AuditReaderImplementor;

/**
 * Initializes a map.
 * @author Adam Warski (adam at warski dot org)
 */
public class ListCollectionInitializor extends AbstractCollectionInitializor<List> {
    private final MiddleComponentData elementComponentData;
    private final MiddleComponentData indexComponentData;

    public ListCollectionInitializor(AuditConfiguration verCfg,
                                    AuditReaderImplementor versionsReader,
                                    RelationQueryGenerator queryGenerator,
                                    Object primaryKey, Number revision,
                                    MiddleComponentData elementComponentData,
                                    MiddleComponentData indexComponentData) {
        super(verCfg, versionsReader, queryGenerator, primaryKey, revision);

        this.elementComponentData = elementComponentData;
        this.indexComponentData = indexComponentData;
    }

    @SuppressWarnings({"unchecked"})
    protected List initializeCollection(int size) {
        // Creating a list of the given capacity with all elements null initially. This ensures that we can then
        // fill the elements safely using the <code>List.set</code> method.
        List list = new ArrayList(size);
        for (int i=0; i<size; i++) { list.add(null); }
        return list;
    }

    @SuppressWarnings({"unchecked"})
    protected void addToCollection(List collection, Object collectionRow) {
        // collectionRow will be the actual object if retrieved from audit relation or middle table
        // otherwise it will be a List
        Object elementData = collectionRow;
	Object indexData = collectionRow;
	if (collectionRow instanceof java.util.List) {
            elementData = ((List) collectionRow).get(elementComponentData.getComponentIndex());
            indexData = ((List) collectionRow).get(indexComponentData.getComponentIndex());
	}
        Object element = elementData instanceof Map ?
                elementComponentData.getComponentMapper().mapToObjectFromFullMap(entityInstantiator,
                (Map<String, Object>) elementData, null, revision)
                : elementData ;

        Object indexObj = indexComponentData.getComponentMapper().mapToObjectFromFullMap(entityInstantiator,
                (Map<String, Object>) indexData, element, revision);
        int index = ((Number) indexObj).intValue();

        collection.set(index, element);
    }
}