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337 lines
8.5 KiB
C++
337 lines
8.5 KiB
C++
/*
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This file is a part of JRTPLIB
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Copyright (c) 1999-2017 Jori Liesenborgs
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Contact: jori.liesenborgs@gmail.com
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This library was developed at the Expertise Centre for Digital Media
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(http://www.edm.uhasselt.be), a research center of the Hasselt University
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(http://www.uhasselt.be). The library is based upon work done for
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my thesis at the School for Knowledge Technology (Belgium/The Netherlands).
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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/**
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* \file rtpkeyhashtable.h
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*/
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#ifndef RTPKEYHASHTABLE_H
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#define RTPKEYHASHTABLE_H
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#include "rtpconfig.h"
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#include "rtperrors.h"
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namespace qrtplib
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{
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template<class Key, class Element, class GetIndex, int hashsize>
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class RTPKeyHashTable
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{
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public:
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RTPKeyHashTable();
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~RTPKeyHashTable()
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{
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Clear();
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}
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void GotoFirstElement()
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{
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curhashelem = firsthashelem;
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}
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void GotoLastElement()
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{
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curhashelem = lasthashelem;
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}
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bool HasCurrentElement()
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{
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return (curhashelem == 0) ? false : true;
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}
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int DeleteCurrentElement();
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Element &GetCurrentElement()
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{
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return curhashelem->GetElement();
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}
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Key &GetCurrentKey()
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{
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return curhashelem->GetKey();
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}
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int GotoElement(const Key &k);
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bool HasElement(const Key &k);
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void GotoNextElement();
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void GotoPreviousElement();
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void Clear();
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int AddElement(const Key &k, const Element &elem);
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int DeleteElement(const Key &k);
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private:
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class HashElement
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{
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public:
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HashElement(const Key &k, const Element &e, int index) :
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key(k), element(e)
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{
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hashprev = 0;
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hashnext = 0;
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listnext = 0;
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listprev = 0;
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hashindex = index;
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}
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int GetHashIndex()
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{
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return hashindex;
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}
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Key &GetKey()
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{
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return key;
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}
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Element &GetElement()
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{
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return element;
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}
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private:
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int hashindex;
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Key key;
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Element element;
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public:
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HashElement *hashprev, *hashnext;
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HashElement *listprev, *listnext;
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};
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HashElement *table[hashsize];
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HashElement *firsthashelem, *lasthashelem;
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HashElement *curhashelem;
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};
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template<class Key, class Element, class GetIndex, int hashsize>
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inline RTPKeyHashTable<Key, Element, GetIndex, hashsize>::RTPKeyHashTable()
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{
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for (int i = 0; i < hashsize; i++)
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table[i] = 0;
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firsthashelem = 0;
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lasthashelem = 0;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline int RTPKeyHashTable<Key, Element, GetIndex, hashsize>::DeleteCurrentElement()
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{
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if (curhashelem)
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{
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HashElement *tmp1, *tmp2;
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int index;
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// First, relink elements in current hash bucket
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index = curhashelem->GetHashIndex();
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tmp1 = curhashelem->hashprev;
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tmp2 = curhashelem->hashnext;
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if (tmp1 == 0) // no previous element in hash bucket
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{
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table[index] = tmp2;
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if (tmp2 != 0)
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tmp2->hashprev = 0;
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}
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else // there is a previous element in the hash bucket
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{
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tmp1->hashnext = tmp2;
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if (tmp2 != 0)
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tmp2->hashprev = tmp1;
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}
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// Relink elements in list
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tmp1 = curhashelem->listprev;
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tmp2 = curhashelem->listnext;
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if (tmp1 == 0) // curhashelem is first in list
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{
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firsthashelem = tmp2;
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if (tmp2 != 0)
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tmp2->listprev = 0;
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else
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// curhashelem is also last in list
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lasthashelem = 0;
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}
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else
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{
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tmp1->listnext = tmp2;
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if (tmp2 != 0)
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tmp2->listprev = tmp1;
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else
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// curhashelem is last in list
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lasthashelem = tmp1;
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}
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// finally, with everything being relinked, we can delete curhashelem
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delete curhashelem;
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curhashelem = tmp2; // Set to next element in list
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}
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else
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return ERR_RTP_KEYHASHTABLE_NOCURRENTELEMENT;
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return 0;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline int RTPKeyHashTable<Key, Element, GetIndex, hashsize>::GotoElement(const Key &k)
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{
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int index;
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bool found;
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index = GetIndex::GetIndex(k);
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if (index >= hashsize)
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return ERR_RTP_KEYHASHTABLE_FUNCTIONRETURNEDINVALIDHASHINDEX;
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curhashelem = table[index];
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found = false;
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while (!found && curhashelem != 0)
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{
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if (curhashelem->GetKey() == k)
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found = true;
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else
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curhashelem = curhashelem->hashnext;
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}
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if (!found)
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return ERR_RTP_KEYHASHTABLE_KEYNOTFOUND;
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return 0;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline bool RTPKeyHashTable<Key, Element, GetIndex, hashsize>::HasElement(const Key &k)
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{
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int index;
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bool found;
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HashElement *tmp;
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index = GetIndex::GetIndex(k);
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if (index >= hashsize)
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return false;
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tmp = table[index];
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found = false;
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while (!found && tmp != 0)
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{
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if (tmp->GetKey() == k)
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found = true;
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else
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tmp = tmp->hashnext;
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}
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return found;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline void RTPKeyHashTable<Key, Element, GetIndex, hashsize>::GotoNextElement()
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{
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if (curhashelem)
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curhashelem = curhashelem->listnext;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline void RTPKeyHashTable<Key, Element, GetIndex, hashsize>::GotoPreviousElement()
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{
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if (curhashelem)
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curhashelem = curhashelem->listprev;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline void RTPKeyHashTable<Key, Element, GetIndex, hashsize>::Clear()
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{
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HashElement *tmp1, *tmp2;
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for (int i = 0; i < hashsize; i++)
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table[i] = 0;
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tmp1 = firsthashelem;
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while (tmp1 != 0)
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{
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tmp2 = tmp1->listnext;
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delete tmp1;
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tmp1 = tmp2;
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}
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firsthashelem = 0;
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lasthashelem = 0;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline int RTPKeyHashTable<Key, Element, GetIndex, hashsize>::AddElement(const Key &k, const Element &elem)
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{
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int index;
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bool found;
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HashElement *e, *newelem;
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index = GetIndex::GetIndex(k);
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if (index >= hashsize)
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return ERR_RTP_KEYHASHTABLE_FUNCTIONRETURNEDINVALIDHASHINDEX;
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e = table[index];
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found = false;
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while (!found && e != 0)
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{
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if (e->GetKey() == k)
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found = true;
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else
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e = e->hashnext;
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}
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if (found)
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return ERR_RTP_KEYHASHTABLE_KEYALREADYEXISTS;
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// Okay, the key doesn't exist, so we can add the new element in the hash table
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newelem = new HashElement(k, elem, index);
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e = table[index];
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table[index] = newelem;
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newelem->hashnext = e;
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if (e != 0)
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e->hashprev = newelem;
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// Now, we still got to add it to the linked list
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if (firsthashelem == 0)
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{
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firsthashelem = newelem;
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lasthashelem = newelem;
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}
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else // there already are some elements in the list
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{
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lasthashelem->listnext = newelem;
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newelem->listprev = lasthashelem;
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lasthashelem = newelem;
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}
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return 0;
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}
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template<class Key, class Element, class GetIndex, int hashsize>
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inline int RTPKeyHashTable<Key, Element, GetIndex, hashsize>::DeleteElement(const Key &k)
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{
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int status;
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status = GotoElement(k);
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if (status < 0)
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return status;
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return DeleteCurrentElement();
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}
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} // end namespace
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#endif // RTPKEYHASHTABLE_H
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