package org.apache.ddlutils.platform.axion;

/*
 * 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.util.ArrayList;
import java.util.Collection;

import org.apache.ddlutils.Platform;
import org.apache.ddlutils.model.Index;
import org.apache.ddlutils.model.Table;
import org.apache.ddlutils.platform.DatabaseMetaDataWrapper;
import org.apache.ddlutils.platform.JdbcModelReader;

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

    /**
     * {@inheritDoc}
     */
    protected Collection readPrimaryKeyNames(DatabaseMetaDataWrapper metaData, String tableName) throws SQLException
    {
        // Axion still does not support DatabaseMetaData#getPrimaryKeys
        return new ArrayList();
    }

    /**
     * {@inheritDoc}
     */
    protected Collection readForeignKeys(DatabaseMetaDataWrapper metaData, String tableName) throws SQLException
    {
        // Axion still does not support DatabaseMetaData#getImportedKeys or #getExportedKeys
        return new ArrayList();
    }

    /**
     * {@inheritDoc}
     */
    protected void removeSystemIndices(DatabaseMetaDataWrapper metaData, Table table) throws SQLException
    {
        // Axion's JDBC driver does not support primary key reading, so we have to filter at this level
        for (int indexIdx = 0; indexIdx < table.getIndexCount();)
        {
            Index index = table.getIndex(indexIdx);

            // also, Axion's internal indices are not unique
            if (index.getName().startsWith("SYS_"))
            {
                table.removeIndex(indexIdx);
            }
            else
            {
                indexIdx++;
            }
        }
    }
}
