/*
 * (c) Copyright 2007-2011 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.databene.platform.db;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.databene.commons.IOUtil;
import org.databene.model.data.ComplexTypeDescriptor;
import org.databene.model.data.Entity;
import org.databene.webdecs.DataContainer;
import org.databene.webdecs.DataIterator;

/**
 * Iterates a ResultSet returning Entity objects.
 * 
 * @author Volker Bergmann
 * |since 0.3.04
 */
public class ResultSetEntityIterator implements DataIterator<Entity> {

    private DataIterator<ResultSet> source;
    
    private ComplexTypeDescriptor descriptor;

    public ResultSetEntityIterator(DataIterator<ResultSet> source, ComplexTypeDescriptor descriptor) {
        this.source = source;
        this.descriptor = descriptor;
    }

	public Class<Entity> getType() {
		return Entity.class;
	}

	public DataContainer<Entity> next(DataContainer<Entity> container) {
		try {
			DataContainer<ResultSet> feed = source.next(new DataContainer<ResultSet>());
			if (feed == null)
				return null;
			ResultSet resultSet = feed.getData();
			Entity result = ResultSet2EntityConverter.convert(resultSet, descriptor);
			return container.setData(result);
		} catch (SQLException e) {
			throw new RuntimeException(e);
		}
    }

	public void close() {
		IOUtil.close(source);
	}

}