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/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * 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.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    FoundationEx
    FILE:         Dictionary.inl
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Implementation of the Dictionary class
*/

#ifndef NDEBUG
#define DICT_CHECK(a, b) if ((a) == 0) throw b;
#else
#define DICT_CHECK(a, b)
#endif

const int CHAINS = 256;

// +-------------------------------------------------------------------+

template <class T> Dictionary<T>::Dictionary()
   : items(0)
{ init(); }

template <class T> Dictionary<T>::~Dictionary()
{ clear(); }

// +-------------------------------------------------------------------+

template <class T>
void Dictionary<T>::init()
{
   items = 0;
   memset(table, 0, CHAINS*sizeof(PTR));
}

template <class T>
void Dictionary<T>::clear()
{
   for (int i = 0; i < CHAINS; i++) {
      DictionaryCell<T>* link = table[i];

      while (link) {
         DictionaryCell<T>* n = link->next;
         delete link;
         link = n;
      }
   }

   init();
}

// +-------------------------------------------------------------------+

template <class T>
T& Dictionary<T>::operator[](const Text& key)
{
   int idx = key.hash() % CHAINS;
   DictionaryCell<T>* cell = table[idx];

   if (cell == 0) {  // empty chain
      items++;

#ifdef MEM_DEBUG
      cell = new(__FILE__,__LINE__) DictionaryCell<T>(key);
#else
      cell = new DictionaryCell<T>(key);
#endif

      table[idx] = cell;
      
      return cell->value;
   }
   else {            // search for key
      while (cell->next && cell->key != key)
         cell = cell->next;

      if (cell->key != key) {    // not found in chain
         items++;

#ifdef MEM_DEBUG
         cell->next = new(__FILE__,__LINE__) DictionaryCell<T>(key);
#else
         cell->next = new DictionaryCell<T>(key);
#endif

         return cell->next->value;
      }
      else {         // found: return it!
         return cell->value;
      }
   }
}

// +-------------------------------------------------------------------+

template <class T>
void Dictionary<T>::insert(const Text& key, const T& val)
{
   T& value = operator[](key);
      value = val;
}

// +-------------------------------------------------------------------+

template <class T>
void Dictionary<T>::remove(const Text& key)
{
   int idx = key.hash() % CHAINS;
   DictionaryCell<T>* cell = table[idx];

   if (cell == 0) {  // empty chain
      return;
   }
   else {            // search for key
      while (cell->next && cell->key != key)
         cell = cell->next;

      if (cell->key != key) {    // not found in chain
         return;
      }
      else {         // found: remove it!
         if (table[idx] == cell) {
            table[idx] = cell->next;
            delete cell;
         }
         else {
            DictionaryCell<T>* p = table[idx];
            while (p->next != cell)
               p = p->next;
            p->next = cell->next;
            delete cell;
         }
      }
   }
}

// +-------------------------------------------------------------------+

template <class T>
int Dictionary<T>::contains(const Text& key) const
{
   int idx = key.hash() % CHAINS;
   DictionaryCell<T>* cell = table[idx];

   if (cell != 0) {
      while (cell->next && cell->key != key)
         cell = cell->next;

      if (cell->key == key)
         return 1;
   }
   
   return 0;
}

// +-------------------------------------------------------------------+

template <class T>
T Dictionary<T>::find(const Text& key, T defval) const
{
   int idx = key.hash() % CHAINS;
   DictionaryCell<T>* cell = table[idx];

   if (cell != 0) {
      while (cell->next && cell->key != key)
         cell = cell->next;

      if (cell->key == key)
         return cell->value;
   }

   return defval;
}

// +-------------------------------------------------------------------+

template <class T> DictionaryIter<T>::DictionaryIter(Dictionary<T>& d)
   : dict(&d), chain(0), here(0)
{ }

template <class T> DictionaryIter<T>::~DictionaryIter()
{ }

// +-------------------------------------------------------------------+

template <class T>
void DictionaryIter<T>::reset()
{
   chain = 0;
   here  = 0;
}

// +-------------------------------------------------------------------+

template <class T>
Text DictionaryIter<T>::key() const
{
   return here->key;
}

template <class T>
T DictionaryIter<T>::value() const
{
   return here->value;
}

// +-------------------------------------------------------------------+

template <class T>
int DictionaryIter<T>::operator++()
{
   forth();
   int more = chain < CHAINS;
   return more;
}

// +-------------------------------------------------------------------+

template <class T>
void DictionaryIter<T>::forth()
{
   if (here) {
      here = here->next;
      if (!here) // off the end of this chain
         chain++;
   }

   if (!here) {
      while (!dict->table[chain] && chain < CHAINS)
         chain++;

      if (chain < CHAINS)
         here = dict->table[chain];   
      else
         here = 0;
   }
}

// +-------------------------------------------------------------------+

template <class T>
void DictionaryIter<T>::attach(Dictionary<T>& d)
{
   dict = &d;
   reset();
}

// +-------------------------------------------------------------------+

template <class T>
Dictionary<T>& DictionaryIter<T>::container()
{
   return *dict;
}