/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Intalio, Inc.  For written permission,
 *    please contact info@exolab.org.
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Intalio, Inc. Exolab is a registered
 *    trademark of Intalio, Inc.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * INTALIO, INC. OR ITS 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.
 *
 * Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id$
 */
package org.castor.cpa.persistence.sql.driver;

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.castor.core.util.Messages;
import org.exolab.castor.jdo.PersistenceException;
import org.exolab.castor.mapping.AccessMode;
import org.exolab.castor.persist.spi.AbstractCallQuery;

/**
 * PersistenceQuery implementation for use with CallableStatements that
 * return a ResultSet, like Oracle stored functions returning REF CURSOR.
 *
 * @author <a href="on@ibis.odessa.ua">Oleg Nitz</a>
 * @version $Revision$ $Date: 2006-04-11 15:26:07 -0600 (Tue, 11 Apr 2006) $
 */
final class ReturnedRSCallQuery extends AbstractCallQuery {
    /** The <a href="http://jakarta.apache.org/commons/logging/">Jakarta
     *  Commons Logging</a> instance used for all logging. */
    private static Log _log = LogFactory.getFactory().getInstance(ReturnedRSCallQuery.class);
    
    private static final int ORACLE_CURSOR_TYPE = -10;
    
    /**
     * Creates an instance of this clas.
     * @param call The SQL CALL statement to execute
     * @param types Java types of the parameters
     * @param javaClass Class type of the result
     * @param fields ???
     * @param sqlTypes SQL types of the parameters
     */
    ReturnedRSCallQuery(final String call, final Class<?>[] types, final Class<?> javaClass,
            final String[] fields, final int[] sqlTypes) {
        super (call, types, javaClass, sqlTypes);
    }

    protected void execute(final Object conn, final AccessMode accessMode)
    throws PersistenceException {
        _lastIdentity = null;
        try {
            _stmt = ((Connection) conn).prepareCall(_call);
            ((CallableStatement) _stmt).registerOutParameter(1, ORACLE_CURSOR_TYPE);
            for (int i = 0; i < _values.length; ++i) {
                _stmt.setObject(i + 2, _values[i]);
                _values[ i ] = null;
            }
            _stmt.execute();
            _rs = (ResultSet) ((CallableStatement) _stmt).getObject(1);
        } catch (SQLException except) {
            if (_stmt != null) {
                try {
                    _stmt.close();
                } catch (SQLException e2) {
                    _log.warn (Messages.message ("persist.stClosingFailed"), e2);
                }
            }
            throw new PersistenceException(Messages.format("persist.nested", except));
        }
    }

    protected boolean nextRow() throws SQLException {
        return _rs.next();
    }
}