ibrdtn/ibrdtn/data/EID.cpp

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/*
 * EID.cpp
 *
 *  Created on: 09.03.2009
 *      Author: morgenro
 */

#include "ibrdtn/data/EID.h"
#include "ibrdtn/utils/Utils.h"
#include <sstream>
#include <iostream>

namespace dtn
{
        namespace data
        {
                const std::string EID::DEFAULT_SCHEME = "dtn";
                const std::string EID::CBHE_SCHEME = "ipn";

                EID::EID()
                : _scheme(DEFAULT_SCHEME), _ssp("none")
                {
                }

                EID::EID(std::string scheme, std::string ssp)
                 : _scheme(scheme), _ssp(ssp)
                {
                        dtn::utils::Utils::trim(_scheme);
                        dtn::utils::Utils::trim(_ssp);

                        // TODO: checks for illegal characters
                }

                EID::EID(std::string value)
                {
                        dtn::utils::Utils::trim(value);

                        try {
                                // search for the delimiter
                                size_t delimiter = value.find_first_of(":");

                                // jump to default eid if the format is wrong
                                if (delimiter == std::string::npos)
                                        throw ibrcommon::Exception("wrong eid format");

                                // the scheme is everything before the delimiter
                                _scheme = value.substr(0, delimiter);

                                // the ssp is everything else
                                size_t startofssp = delimiter + 1;
                                _ssp = value.substr(startofssp, value.length() - startofssp);

                                // TODO: do syntax check
                        } catch (...) {
                                _scheme = DEFAULT_SCHEME;
                                _ssp = "none";
                        }
                }

                EID::EID(size_t node, size_t application)
                 : _scheme(EID::CBHE_SCHEME), _ssp()
                {
                        if (node == 0)
                        {
                                _scheme = DEFAULT_SCHEME;
                                _ssp = "none";
                                return;
                        }

                        std::stringstream ss_ssp;
                        ss_ssp << node << "." << application;
                        _ssp = ss_ssp.str();
                }

                EID::~EID()
                {
                }

                EID& EID::operator=(const EID &other)
                {
                        _ssp = other._ssp;
                        _scheme = other._scheme;
                        return *this;
                }

                bool EID::operator==(EID const& other) const
                {
                        return (_ssp == other._ssp) && (_scheme == other._scheme);
                }

                bool EID::operator==(string const& other) const
                {
                        return ((*this) == EID(other));
                }

                bool EID::operator!=(EID const& other) const
                {
                        return !((*this) == other);
                }

                EID EID::operator+(string suffix) const
                {
                        return EID(getString() + suffix);
                }

                bool EID::sameHost(string const& other) const
                {
                        return ( EID(other) == getNode() );
                }

                bool EID::sameHost(EID const& other) const
                {
                        return ( other.getNode() == getNode() );
                }

                bool EID::operator<(EID const& other) const
                {
                        return getString() < other.getString();
                }

                bool EID::operator>(EID const& other) const
                {
                        return other < (*this);
                }

                std::string EID::getString() const
                {
                        return _scheme + ":" + _ssp;
                }

                std::string EID::getApplication() const throw (ibrcommon::Exception)
                {
                        size_t first_char = 0;
                        char delimiter = '.';

                        if (_scheme != EID::CBHE_SCHEME)
                        {
                                // with a uncompressed bundle header we have another delimiter
                                delimiter = '/';

                                // first char not "/", e.g. "//node1" -> 2
                                first_char = _ssp.find_first_not_of(delimiter);

                                // only "/" ? thats bad!
                                if (first_char == std::string::npos)
                                        throw ibrcommon::Exception("wrong eid format");
                        }

                        // start of application part
                        size_t application_start = _ssp.find_first_of(delimiter, first_char);

                        // no application part available
                        if (application_start == std::string::npos)
                                return "";

                        if (_scheme == EID::CBHE_SCHEME)
                        {
                                // return the application part
                                return _ssp.substr(application_start + 1, _ssp.length() - application_start - 1);
                        }
                        else
                        {
                                // return the application part
                                return _ssp.substr(application_start, _ssp.length() - application_start);
                        }
                }

                std::string EID::getHost() const throw (ibrcommon::Exception)
                {
                        size_t first_char = 0;
                        char delimiter = '.';

                        if (_scheme != EID::CBHE_SCHEME)
                        {
                                // with a uncompressed bundle header we have another delimiter
                                delimiter = '/';

                                // first char not "/", e.g. "//node1" -> 2
                                first_char = _ssp.find_first_not_of(delimiter);

                                // only "/" ? thats bad!
                                if (first_char == std::string::npos)
                                        throw ibrcommon::Exception("wrong eid format");
                        }

                        // start of application part
                        size_t application_start = _ssp.find_first_of(delimiter, first_char);

                        // no application part available
                        if (application_start == std::string::npos)
                                return _ssp;

                        // return the node part
                        return _ssp.substr(0, application_start);
                }

                std::string EID::getScheme() const
                {
                        return _scheme;
                }

                EID EID::getNode() const throw (ibrcommon::Exception)
                {
                        return _scheme + ":" + getHost();
                }

                bool EID::hasApplication() const
                {
                        // with a compressed bundle header we have another delimiter
                        if (_scheme == EID::CBHE_SCHEME)
                        {
                                return (_ssp.find_first_of(".") != std::string::npos);
                        }

                        // first char not "/", e.g. "//node1" -> 2
                        size_t first_char = _ssp.find_first_not_of("/");

                        // only "/" ? thats bad!
                        if (first_char == std::string::npos)
                                throw ibrcommon::Exception("wrong eid format");

                        // start of application part
                        size_t application_start = _ssp.find_first_of("/", first_char);

                        // no application part available
                        if (application_start == std::string::npos)
                                return false;

                        // return the application part
                        return true;
                }

                bool EID::isCompressable() const
                {
                        return ((_scheme == DEFAULT_SCHEME) && (_ssp == "none")) || (_scheme == EID::CBHE_SCHEME);
                }

                std::pair<size_t, size_t> EID::getCompressed() const
                {
                        size_t node = 0;
                        size_t app = 0;

                        if (isCompressable())
                        {
                                std::stringstream ss_node(getHost());
                                ss_node >> node;

                                if (hasApplication())
                                {
                                        std::stringstream ss_app(getApplication());
                                        ss_app >> app;
                                }
                        }

                        return make_pair(node, app);
                }
        }
}