/*
 * 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.
 */

/* $Rev$ $Date$ */

#ifndef commonj_sdo_DataObjectInstance_h
#define commonj_sdo_DataObjectInstance_h


#include "commonj/sdo/export.h"
#include "commonj/sdo/SDO.h"
using commonj::sdo::DataObjectPtr;
using commonj::sdo::DataObject;


namespace commonj
{
    namespace sdo
    {
/**
 * DataObjectInstance is a class which allows DataObjects to be considered
 * as instances rather than data object pointers.
 */
        class DataObjectInstance  
        {
        
        public:
            SDO_API DataObjectInstance();
            SDO_API virtual ~DataObjectInstance();

            SDO_API DataObjectInstance(const DataObjectPtr& theDO);
            SDO_API DataObjectInstance(const DataObjectInstance&);

            SDO_API DataObjectInstance& operator=(const DataObjectInstance&);
            SDO_API bool operator!() {return (!dataObject);}
            SDO_API operator bool() {return !!dataObject;}

            SDO_API DataObject* operator->() {return dataObject;}

            SDO_API DataObjectPtr getDataObject() {return dataObject;}
            SDO_API operator DataObjectPtr() {return dataObject;}
        private:
            DataObjectPtr dataObject;
        };
    } // End namespace sdo
} // End namespace commonj

#endif // commonj_sdo_DataObjectInstance_h