ExtensionBlock.h

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/*
 * ExtensionBlock.h
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * 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 EXTENSIONBLOCK_H_
#define EXTENSIONBLOCK_H_

#include "ibrdtn/data/Block.h"
#include <ibrcommon/data/BLOB.h>
#include <ibrdtn/data/Number.h>
#include <map>

namespace dtn
{
        namespace data
        {
                class ExtensionBlock : public Block
                {
                public:
                        class Factory
                        {
                        public:
                                virtual dtn::data::Block* create() = 0;

                                static Factory& get(block_t type) throw (ibrcommon::Exception);

                        protected:
                                Factory(block_t type);
                                virtual ~Factory();

                        private:
                                block_t _type;
                        };

                        ExtensionBlock();
                        ExtensionBlock(ibrcommon::BLOB::Reference ref);
                        virtual ~ExtensionBlock();

                        ibrcommon::BLOB::Reference getBLOB() const;

                        void setType(block_t type);

                        virtual Length getLength() const;
                        virtual std::ostream &serialize(std::ostream &stream, Length &length) const;
                        virtual std::istream &deserialize(std::istream &stream, const Length &length);

                protected:
                        class FactoryList
                        {
                        public:
                                FactoryList();
                                virtual ~FactoryList();

                                Factory& get(block_t type) throw (ibrcommon::Exception);
                                void add(block_t type, Factory *f) throw (ibrcommon::Exception);
                                void remove(block_t type);

                                static void initialize();

                        private:
                                std::map<block_t, Factory*> fmap;
                        };

                        static FactoryList *factories;

                private:
                        ibrcommon::BLOB::Reference _blobref;
                };
        }
}

#endif /* EXTENSIONBLOCK_H_ */