source: source/ariba/Name.h@ 2432

// [License]
// The Ariba-Underlay Copyright
//
// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
//
// Institute of Telematics
// UniversitÀt Karlsruhe (TH)
// Zirkel 2, 76128 Karlsruhe
// Germany
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OF TELEMATICS OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// The views and conclusions contained in the software and documentation
// are those of the authors and should not be interpreted as representing
// official policies, either expressed or implied, of the Institute of
// Telematics.
// [License]

#ifndef NAME_H_
#define NAME_H_

#include <iostream>
#include <memory.h>

// forward declaration
namespace ariba { class Name; }

std::ostream& operator<<( std::ostream&, const ariba::Name& );

#include "Identifiers.h"

namespace ariba {

/**
 * This class is a wrapper for canonical names.
 * Currently only human readable names are supported.
 *
 * @author Sebastian Mies <mies@tm.uka.de>
 */
class Name {
        friend std::ostream& operator<<( std::ostream&, const ::ariba::Name& );

private:
        bool _hreadable;
        bool _copy;
        int _length;
        uint8_t* _bytes;

        inline void init(const char* name, int len, bool copy, bool hreadable) {
                if (len == -1)
                        len = strlen(name);

                if (copy) {
                        _bytes = new uint8_t[len];
                        memcpy(_bytes, name, len);
                } else {
                        _bytes = (uint8_t*)name;
                }

                _copy = copy;
                _length = len;
                _hreadable = hreadable;
        }

public:
        static const Name UNSPECIFIED;

public:
        /**
         * Constructs a new, yet unspecified name.
         */
        inline Name() {
                _bytes = NULL;
                _length = 0;
                _copy = false;
                _hreadable = false;
        }

        /**
         * Constructs a new name. If no length is specified, a human-readable
         * name is assumed.
         *
         * @param name The name
         * @param len The optional name length, if binary data is used as name
         * @param copy A flag, whether the name's memory needs to be copied
         */
        inline Name(const char* name, int len = -1, bool copy = false) {
                init(name, len, copy, len == -1);
        }

        /**
         * Constructs a new name out of a human readable string.
         *
         * @param name A human readable name
         */
        inline Name(std::string name) {
                init(name.c_str(), -1, true, true);
        }

        /**
         * The copy constructor.
         */
        inline Name(const Name& name) {
                init((const char*)name.bytes(), name.length(), true, name._hreadable);
        }

        /**
         * Destroys the name and releases underlying memory if this name is a copy.
         */
        inline ~Name() {
                if (_copy) delete _bytes;
        }

        /**
         * Returns the binary bytes of the name
         *
         * @return The binary data
         */
        inline const uint8_t* bytes() const {
                return _bytes;
        }

        /**
         * Returns the length of the name in bytes.
         *
         * @return The length of the name
         */
        inline const size_t length() const {
                return _length;
        }

        /**
         * The common implementation of the "equal" operator.
         */
        inline bool operator==(const Name& name) const {
                if (_bytes == NULL || name._bytes == NULL) return false;
                if (name.length() != length()) return false;
                return (memcmp(name.bytes(), bytes(), length()) == 0);
        }

        /**
         * The common implementation of the "unequal" operator.
         */
        inline bool operator!=(const Name& name) const {
                return !(*this == name);
        }

        /**
         * Returns true, if the name is yet unspecified
         */
        inline bool isUnspecified() {
                return *this == UNSPECIFIED;
        }

        /**
         * Returns a random name.
         */
        inline static Name random() {
                char name[17];
                for (int i=0;i<16; i++)
                        name[i] = ("abcdefghijklmnopqrstuvwxyz")[((unsigned)rand())%26];
                name[16] = 0;
                return Name(name);
        }

        /**
         * Returns a human-readable representation of this name
         */
        inline std::string toString() const {
                if (_hreadable) {
                        char str[256];
                        for (int i=0; i<length(); i++) str[i] = bytes()[i];
                        str[length()] = 0;
                        return std::string(str);
                } else {
                        return std::string("<not readable>");
                }
        }

        // hack: to be changed!
        inline NodeID toNodeId() const {
                return NodeID::sha1( bytes(), length() );
        }

        // hack: to be changed!
        inline SpoVNetID toSpoVNetId() const {
                return SpoVNetID::sha1(bytes(), length() );
        }
};

} // namespace ariba

#endif /* NAME_H_ */