//
// Copyright (C) 2007 Refractions Research, Inc. 
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of version 2.1 of the GNU Lesser
// General Public License as published by the Free Software Foundation.
// 
// This library 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
//
#ifndef FDOPOSTGIS_UPDATECOMMAND_H_INCLUDED
#define FDOPOSTGIS_UPDATECOMMAND_H_INCLUDED

#include "FeatureCommand.h"
#include <Fdo/Commands/Feature/IUpdate.h>

//
// Forward declarations
//
class FdoPropertyValueCollection;
class FdoILockConflictReader;


namespace fdo { namespace postgis {

// Forward declarations of internal types
class Connection;

/// Implementation of interface of Update command which modifies features.
/// The command updates instances of a given class that match specified criteria.
///
class UpdateCommand : public FeatureCommand<FdoIUpdate>
{
public:

    /// Constructor creates update command associated with given connection.
    UpdateCommand(Connection* conn);

    //
    // FdoIUpdate interface
    //

    /// Get collection of names and values of properties to be updated by the command.
    virtual FdoPropertyValueCollection* GetPropertyValues();
 	
    /// Execute update command and return the number of affected instances of features.
    virtual FdoInt32 Execute();
 	
    /// Updating objects might result in lock conflicts if objects to be updated
    /// are not exclusively locked for the user attempting to update the object. 
    virtual FdoILockConflictReader* GetLockConflicts();

protected:

    /// Destructor.
    virtual ~UpdateCommand();

private:

    typedef FeatureCommand<FdoIUpdate> Base;

    //
    // Data members
    //

    FdoPtr<FdoPropertyValueCollection> mPropertyValues;
};

}} // namespace fdo::postgis

#endif // FDOPOSTGIS_UPDATECOMMAND_H_INCLUDED