/*
// $Id: //open/dev/farrago/src/net/sf/farrago/ddl/DdlAlterIdentityColumnStmt.java#7 $
// Farrago is an extensible data management system.
// Copyright (C) 2005-2009 The Eigenbase Project
// Copyright (C) 2005-2009 SQLstream, Inc.
// Copyright (C) 2005-2009 LucidEra, Inc.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version approved by The Eigenbase Project.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
package net.sf.farrago.ddl;

import net.sf.farrago.catalog.*;
import net.sf.farrago.cwm.relational.*;
import net.sf.farrago.fem.med.*;
import net.sf.farrago.fem.sql2003.*;
import net.sf.farrago.resource.*;
import net.sf.farrago.session.*;

import org.eigenbase.reltype.*;


/**
 * Statement for altering an identity column. This statement is one form of an
 * alter table statement and is possible because only one table action is
 * performed at a time.
 *
 * @author John Pham
 * @version $Id: //open/dev/farrago/src/net/sf/farrago/ddl/DdlAlterIdentityColumnStmt.java#7 $
 */
public class DdlAlterIdentityColumnStmt
    extends DdlAlterStmt
{
    //~ Instance fields --------------------------------------------------------

    private FarragoSequenceOptions options;

    //~ Constructors -----------------------------------------------------------

    public DdlAlterIdentityColumnStmt(
        CwmColumn column,
        FarragoSequenceOptions options)
    {
        super(column);
        this.options = options;
    }

    //~ Methods ----------------------------------------------------------------

    protected void execute(
        FarragoSessionDdlValidator ddlValidator,
        FarragoSession session)
    {
        FemAbstractTypedElement column =
            (FemAbstractTypedElement) getModelElement();
        FemSequenceGenerator sequence = null;
        if (column instanceof FemStoredColumn) {
            sequence = ((FemStoredColumn) column).getSequence();
        }
        if (sequence == null) {
            FarragoResource.instance().ValidatorAlterIdentityFailed.ex(
                column.getName());
        }
        RelDataType dataType =
            ddlValidator.getTypeFactory().createCwmElementType(column);

        FarragoSequenceAccessor accessor =
            session.getRepos().getSequenceAccessor(sequence.refMofId());
        accessor.alterSequence(options, dataType);
    }
}

// End DdlAlterIdentityColumnStmt.java
