ExtensionBlock.cpp

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/*
 * ExtensionBlock.cpp
 *
 * 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.
 *
 */

#include "ibrdtn/data/ExtensionBlock.h"
#include "ibrdtn/data/Exceptions.h"
#include "ibrdtn/data/ExtensionBlock.h"
#include <ibrcommon/thread/MutexLock.h>

namespace dtn
{
        namespace data
        {
                ExtensionBlock::FactoryList *ExtensionBlock::factories = NULL;

                ExtensionBlock::FactoryList::FactoryList()
                { }

                ExtensionBlock::FactoryList::~FactoryList()
                { }

                void ExtensionBlock::FactoryList::initialize()
                {
                        static ibrcommon::Mutex mutex;
                        ibrcommon::MutexLock l(mutex);

                        if (ExtensionBlock::factories == NULL)
                        {
                                ExtensionBlock::factories = new ExtensionBlock::FactoryList();
                        }
                }

                ExtensionBlock::Factory& ExtensionBlock::FactoryList::get(const block_t type) throw (ibrcommon::Exception)
                {
                        std::map<block_t, ExtensionBlock::Factory*>::iterator iter = fmap.find(type);

                        if (iter != fmap.end())
                        {
                                return *(iter->second);
                        }

                        throw ibrcommon::Exception("Factory not available");
                }

                void ExtensionBlock::FactoryList::add(const block_t type, Factory *f) throw (ibrcommon::Exception)
                {
                        try {
                                get(type);
                                throw ibrcommon::Exception("extension block type already taken");
                        } catch (const ibrcommon::Exception&) {
                                fmap[type] = f;
                        }
                }

                void ExtensionBlock::FactoryList::remove(const block_t type)
                {
                        fmap.erase(type);
                }

                ExtensionBlock::Factory::Factory(block_t type)
                 : _type(type)
                {
                        ExtensionBlock::FactoryList::initialize();
                        ExtensionBlock::factories->add(type, this);
                }

                ExtensionBlock::Factory::~Factory()
                {
                        ExtensionBlock::factories->remove(_type);
                }

                ExtensionBlock::Factory& ExtensionBlock::Factory::get(block_t type) throw (ibrcommon::Exception)
                {
                        ExtensionBlock::FactoryList::initialize();
                        return ExtensionBlock::factories->get(type);
                }

                ExtensionBlock::ExtensionBlock()
                 : Block(0), _blobref(ibrcommon::BLOB::create())
                {
                }

                ExtensionBlock::ExtensionBlock(ibrcommon::BLOB::Reference ref)
                 : Block(0), _blobref(ref)
                {
                }

                ExtensionBlock::~ExtensionBlock()
                {
                }

                ibrcommon::BLOB::Reference ExtensionBlock::getBLOB() const
                {
                        return _blobref;
                }

                void ExtensionBlock::setType(block_t type)
                {
                        _blocktype = type;
                }

                Length ExtensionBlock::getLength() const
                {
                        ibrcommon::BLOB::Reference blobref = _blobref;
                        ibrcommon::BLOB::iostream io = blobref.iostream();
                        return io.size();
                }

                std::ostream& ExtensionBlock::serialize(std::ostream &stream, Length &) const
                {
                        ibrcommon::BLOB::Reference blobref = _blobref;
                        ibrcommon::BLOB::iostream io = blobref.iostream();

                        try {
                                ibrcommon::BLOB::copy(stream, *io, io.size());
                        } catch (const ibrcommon::IOException &ex) {
                                throw dtn::SerializationFailedException(ex.what());
                        }

                        return stream;
                }

                std::istream& ExtensionBlock::deserialize(std::istream &stream, const Length &length)
                {
                        // lock the BLOB
                        ibrcommon::BLOB::iostream io = _blobref.iostream();

                        // clear the blob
                        io.clear();

                        // check if the blob is ready
                        if (!(*io).good()) throw dtn::SerializationFailedException("could not open BLOB for payload");

                        try {
                                ibrcommon::BLOB::copy(*io, stream, length);
                        } catch (const ibrcommon::IOException &ex) {
                                throw dtn::SerializationFailedException(ex.what());
                        }

                        // set block not processed bit
                        set(dtn::data::Block::FORWARDED_WITHOUT_PROCESSED, true);

                        return stream;
                }
        }
}