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/* ====================================================================
 * 
 * The ObjectStyle Group Software License, version 1.1
 * ObjectStyle Group - http://objectstyle.org/
 * 
 * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
 * of the software. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 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 end-user documentation included with the redistribution, if any,
 *    must include the following acknowlegement:
 *    "This product includes software developed by independent contributors
 *    and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 * 
 * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
 *    or promote products derived from this software without prior written
 *    permission. For written permission, email
 *    "andrus at objectstyle dot org".
 * 
 * 5. Products derived from this software may not be called "ObjectStyle"
 *    or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
 *    names without prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED ``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 THE OBJECTSTYLE GROUP 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.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals and hosted on ObjectStyle Group web site.  For more
 * information on the ObjectStyle Group, please see
 * .
 */
package org.objectstyle.cayenne.dba.oracle;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collection;

import org.objectstyle.cayenne.access.OperationObserver;
import org.objectstyle.cayenne.access.QueryLogger;
import org.objectstyle.cayenne.access.jdbc.SQLStatement;
import org.objectstyle.cayenne.access.jdbc.SQLTemplateAction;
import org.objectstyle.cayenne.dba.DbAdapter;
import org.objectstyle.cayenne.query.SQLTemplate;

/**
 * A SQLTemplateAction that addresses Oracle 8 driver limitations.
 * 
 * @since 1.2
 * @author Andrus Adamchik
 */
class Oracle8SQLTemplateAction extends SQLTemplateAction {

    Oracle8SQLTemplateAction(SQLTemplate query, DbAdapter adapter) {
        super(query, adapter);
    }

    /**
     * Overrides super implementation to guess whether the query is selecting or not and
     * execute it appropriately. Super implementation relied on generic JDBC mechanism,
     * common for selecting and updating statements that does not work in Oracle 8.*
     * drivers.
     */
    protected void execute(
            Connection connection,
            OperationObserver callback,
            SQLStatement compiled,
            Collection updateCounts) throws SQLException, Exception {

        String sql = compiled.getSql().trim();
        boolean select = sql.length() > "SELECT".length()
                && sql.substring(0, "SELECT".length()).equalsIgnoreCase("SELECT");

        long t1 = System.currentTimeMillis();
        boolean iteratedResult = callback.isIteratedResult();
        PreparedStatement statement = connection.prepareStatement(compiled.getSql());
        try {
            bind(statement, compiled.getBindings());

            // start - code different from super
            if (select) {

                ResultSet resultSet = statement.executeQuery();
                try {
                    processSelectResult(
                            compiled,
                            connection,
                            statement,
                            resultSet,
                            callback,
                            t1);
                }
                finally {
                    if (!iteratedResult) {
                        resultSet.close();
                    }
                }
            }
            else {
                int updateCount = statement.executeUpdate();
                updateCounts.add(new Integer(updateCount));
                QueryLogger.logUpdateCount(updateCount);
            }

            // end - code different from super
        }
        finally {
            if (!iteratedResult) {
                statement.close();
            }
        }
    }
}