ReadAccess.h

/* 
*  Copyright 2011 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_READACCESS_H
#define STROMX_RUNTIME_READACCESS_H

#include <memory>
#include "stromx/runtime/Data.h"
#include "stromx/runtime/DataContainer.h"
#include "stromx/runtime/Exception.h"

namespace stromx
{
    namespace runtime
    {
        namespace impl
        {
            class ReadAccessImpl;
        }
        
        class STROMX_RUNTIME_API ReadAccess
        {
        public:
            ReadAccess() {}
            
            explicit ReadAccess(const DataContainer & data);
            
            ReadAccess(const DataContainer & data, const unsigned int timeout);
            
            bool empty() const { return m_impl.get() == 0; }
            
            template<typename data_t>
            const data_t & get() const
            {
                try
                {
                    return data_cast<data_t>(get());
                }
                catch(std::bad_cast &)
                {
                    throw BadCast();
                }
            }
            
            const Data & get() const;
            
            void release();
            
        private:
            std::tr1::shared_ptr<impl::ReadAccessImpl> m_impl;
        };
    }
}

#endif // STROMX_RUNTIME_READACCESS_H