package org.apache.ddlutils.platform.maxdb;

/*
 * 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.io.IOException;

import org.apache.ddlutils.Platform;
import org.apache.ddlutils.model.Column;
import org.apache.ddlutils.model.Database;
import org.apache.ddlutils.model.ForeignKey;
import org.apache.ddlutils.model.Table;
import org.apache.ddlutils.platform.sapdb.SapDbBuilder;

/**
 * The SQL Builder for MaxDB.
 * 
 * @version $Revision: $
 */
public class MaxDbBuilder extends SapDbBuilder
{
    /**
     * Creates a new builder instance.
     * 
     * @param platform The plaftform this builder belongs to
     */
    public MaxDbBuilder(Platform platform)
    {
        super(platform);
    }

    /**
     * {@inheritDoc}
     */
    protected void writeExternalPrimaryKeysCreateStmt(Table table, Column[] primaryKeyColumns) throws IOException
    {
        if ((primaryKeyColumns.length > 0) && shouldGeneratePrimaryKeys(primaryKeyColumns))
        {
            print("ALTER TABLE ");
            printlnIdentifier(getTableName(table));
            printIndent();
            print("ADD CONSTRAINT ");
            printIdentifier(getConstraintName(null, table, "PK", null));
            print(" ");
            writePrimaryKeyStmt(table, primaryKeyColumns);
            printEndOfStatement();
        }
    }

    /**
     * {@inheritDoc}
     */
    protected void writeExternalForeignKeyCreateStmt(Database database, Table table, ForeignKey key) throws IOException
    {
        if (key.getForeignTableName() == null)
        {
            _log.warn("Foreign key table is null for key " + key);
        }
        else
        {
            writeTableAlterStmt(table);

            print("ADD CONSTRAINT ");
            printIdentifier(getForeignKeyName(table, key));
            print(" FOREIGN KEY (");
            writeLocalReferences(key);
            print(") REFERENCES ");
            printIdentifier(getTableName(database.findTable(key.getForeignTableName())));
            print(" (");
            writeForeignReferences(key);
            print(")");
            printEndOfStatement();
        }
    }

    /**
     * {@inheritDoc}
     */
    protected void writeExternalForeignKeyDropStmt(Table table, ForeignKey foreignKey) throws IOException
    {
        writeTableAlterStmt(table);
        print("DROP CONSTRAINT ");
        printIdentifier(getForeignKeyName(table, foreignKey));
        printEndOfStatement();
    }
}
