package org.apache.ddlutils.platform.sapdb;

/*
 * 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.
 * Modified by
 * @author  Data Virtuality GmbH
 * @date    $Date$
 *  
 */

import java.sql.SQLException;
import java.sql.Types;
import java.util.Map;

import org.apache.ddlutils.Platform;
import org.apache.ddlutils.model.Column;
import org.apache.ddlutils.platform.DatabaseMetaDataWrapper;
import org.apache.ddlutils.platform.JdbcModelReader;

/**
 * Reads a database model from a SapDb database.
 *
 * @version $Revision: $
 */
public class SapDbModelReader extends JdbcModelReader
{
    /**
     * Creates a new model reader for SapDb databases.
     * 
     * @param platform The platform that this model reader belongs to
     */
    public SapDbModelReader(Platform platform)
    {
        super(platform);
        setDefaultCatalogPattern(null);
        setDefaultSchemaPattern(null);
        setDefaultTablePattern("%");
    }

	/**
     * {@inheritDoc}
     */
    protected Column readColumn(DatabaseMetaDataWrapper metaData, Map values) throws SQLException
    {
		Column column = super.readColumn(metaData, values);

		if (column.getDefaultValue() != null)
		{
			// SapDb pads the default value with spaces
			column.setDefaultValue(column.getDefaultValue().trim());
			// SapDb uses the default value for the auto-increment specification
			if (column.getDefaultValue().startsWith("DEFAULT SERIAL"))
			{
				column.setAutoIncrement(true);
				column.setDefaultValue(null);
			}
		}
		if (column.getTypeCode() == Types.DECIMAL)
		{
			// We also perform back-mapping to BIGINT
			if ((column.getSizeAsInt() == 38) && (column.getScale() == 0))
			{
				column.setTypeCode(Types.BIGINT);
			}
		}
		return column;
	}
}
