ConstDataRef.h

/* 
 *  Copyright 2012 Matthias Fuchs
 *
 *  Licensed 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.
 */

#ifndef STROMX_RUNTIME_CONSTDATAREF_H
#define STROMX_RUNTIME_CONSTDATAREF_H

#include "stromx/runtime/DataInterface.h"

#ifdef __GNUG__
    #include <tr1/memory>
#else
    #include <memory>
#endif

namespace stromx
{
    namespace runtime
    {
        class Data;
        class DataRef;
        
        class STROMX_RUNTIME_API ConstDataRef : public DataInterface
        {
            friend class DataRefTest;
            
        public:
            ConstDataRef() {}
            
            explicit ConstDataRef(const Data* data);
            
            explicit ConstDataRef(const DataRef & dataRef);

            operator const Data&() { return *m_data; }
            
            bool isNull() const { return bool(m_data); }
            
            virtual const Version & version() const;
            virtual const std::string & type() const;
            virtual const std::string & package() const;
            virtual const VariantHandle & variant() const;
            
            bool isVariant(const VariantInterface & v) const;
            virtual Data* clone() const;
            
            virtual void serialize(OutputProvider & out) const;
            virtual void deserialize(InputProvider & in, const Version & version);
            
        private:
            std::tr1::shared_ptr<const Data> m_data;
        };
        
        template<typename data_t>
        const data_t & data_cast(ConstDataRef & data)
        {
            return data_cast<data_t>((const Data &)(data));
        }
    }
}

#endif // STROMX_RUNTIME_CONSTDATAREF_H