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 /*
  * This file is part of the DOM implementation for KDE.
  *
  * Copyright (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef _MultiMap_h_
 #define _MultiMap_h_
 
 #include <assert.h>
 #include <stdlib.h>
 
 #include <QHash>
 #include <QList>
 #include <QSet>
 
 template<class T> class MultiMapPtrList;
 
 template<class K, class T>
 class KMultiMap
 {
 public:
     typedef QSet<T *> Set;
     typedef QHash<K *, Set *> Map;
     typedef MultiMapPtrList<T *> List;
 
     KMultiMap() {}
     ~KMultiMap()
     {
         qDeleteAll(map);
         map.clear();
     }
 
     void insert(K *key, T *element)
     {
         Set *set = map.value(key);
         if (!set) {
             set = new Set();
             map.insert(key, set);
         }
         if (!set->contains(element)) {
             set->insert(element);
         }
     }
     void remove(K *key, T *element)
     {
         Set *set = map.value(key);
         if (set) {
             set->remove(element);
             if (set->isEmpty()) {
                 map.remove(key);
                 delete set;
             }
         }
     }
     void remove(K *key)
     {
         Set *set = map.value(key);
         if (set) {
             map.remove(key);
             delete set;
         }
     }
     Set *find(K *key)
     {
         return map.value(key);
     }
 private:
     Map map;
 };
 
 static inline unsigned int stupidHash(void *ptr)
 {
     unsigned long val = (unsigned long)ptr;
     // remove alignment and multiply by a prime unlikely to be a factor of size
     val = (val >> 4) * 1237;
     return val;
 }
 
 #define START_PTRLIST_SIZE 4
 #define MAX_PTRLIST_SIZE 27
 
 class PtrListEntry
 {
 public:
     PtrListEntry(unsigned int log_size) : count(0), log_size(log_size), search(log_size), next(0)
     {
 //         entry = new T* [size];
         assert(log_size < MAX_PTRLIST_SIZE);
         entry = (void **)calloc((1 << log_size), sizeof(void *));
     }
     ~PtrListEntry()
     {
 //         delete[] entry;
         free(entry);
     }
     bool insert(void *e)
     {
         unsigned int t_size = size();
         if (count == t_size) {
             return false;
         }
         unsigned int hash = stupidHash(e);
         void **firstFree = 0;
         // Only let elements be placed 'search' spots from their hash
         for (unsigned int j = 0; j < search; j++) {
             unsigned int i = (hash + j) & (t_size - 1); // modulo size
             // We need check to all hashes in 'search' to garuantee uniqueness
             if (entry[i] == 0) {
                 if (!firstFree) {
                     firstFree = entry + i;
                 }
             } else if (entry[i] == e) {
                 return true;
             }
         }
         if (firstFree) {
             *firstFree = e;
             count++;
             return true;
         }
         // We had more than 'search' collisions
         if (count < (t_size / 3) * 2) {
             // only 2/3 full => increase search
             unsigned int s = search * 2;
             if (s >= t_size) {
                 s = t_size;
             }
             search = s;
             return insert(e);
         }
         return false;
     }
     // Insert another smaller set into this one
     // Is only garuantied to succede when this PtrList is new
     void insert(PtrListEntry *listEntry)
     {
         assert(size() >= listEntry->count * 2);
         unsigned int old_size = 1U << listEntry->log_size;
         for (unsigned int i = 0; i < old_size; i++) {
             bool s = true;
             void *e = listEntry->entry[i];
             if (e) {
                 s = insert(e);
             }
             assert(s);
         }
     }
     bool remove(void *e)
     {
         if (count == 0) {
             return false;
         }
         unsigned int size = (1U << log_size);
         unsigned int hash = stupidHash(e);
         // Elements are at most placed 'search' spots from their hash
         for (unsigned int j = 0; j < search; j++) {
             unsigned int i = (hash + j) & (size - 1); // modulo size
             if (entry[i] == e) {
                 entry[i] = 0;
                 count--;
                 return true;
             }
         }
         return false;
     }
     bool contains(void *e)
     {
         if (count == 0) {
             return false;
         }
         unsigned int t_size = size();
         unsigned int hash = stupidHash(e);
         // Elements are at most placed 'search' spots from their hash
         for (unsigned int j = 0; j < search; j++) {
             unsigned int i = (hash + j) & (t_size - 1); // modulo size
             if (entry[i] == e) {
                 return true;
             }
         }
         return false;
     }
     void *at(unsigned int i) const
     {
         assert(i < (1U << log_size));
         return entry[i];
     }
     bool isEmpty() const
     {
         return count == 0;
     }
     bool isFull() const
     {
         return count == size();
     }
     unsigned int size() const
     {
         return (1U << log_size);
     }
 
     unsigned int count;
     const unsigned short log_size;
     unsigned short search;
     PtrListEntry *next;
     void **entry;
 };
 
 // An unsorted and unique PtrList that is implement as a linked list of hash-sets
 // Optimized for fast insert and fast lookup
 template<class T>
 class MultiMapPtrList
 {
 public:
     MultiMapPtrList(unsigned int init_size = 16) : m_first(0), m_current(0), m_pos(0)
     {
         assert(init_size > 0);
         unsigned int s = init_size - 1;
         unsigned int log_size = 0;
         while (s > 0) {
             log_size++;
             s = s >> 1;
         }
         m_first = new PtrListEntry(log_size);
     }
     MultiMapPtrList(const MultiMapPtrList &ptrList) : m_first(0), m_current(0), m_pos(0)
     {
         unsigned int t_count = ptrList.count();
         unsigned int log_size = 0;
         while (t_count > 0) {
             log_size++;
             t_count = t_count >> 1;
         }
         // At least as large as the largest ptrListEntry in the original
         if (t_count < ptrList.m_first->log_size) {
             log_size = ptrList.m_first->log_size;
         }
         m_first = new PtrListEntry(log_size);
 
         PtrListEntry *t_current = ptrList.m_first;
         while (t_current) {
             unsigned int t_size = t_current->size();
             for (unsigned int i = 0; i < t_size; i++) {
                 void *e = t_current->at(i);
                 if (e != 0) {
                     bool t = m_first->insert(e);
                     if (!t) {
                         // Make a new, but keep the size
                         PtrListEntry *t_new = new PtrListEntry(log_size);
                         t_new->insert(e);
                         t_new->next = m_first;
                         m_first = t_new;
                     }
                 }
             }
             t_current = t_current->next;
         }
     }
     ~MultiMapPtrList()
     {
         PtrListEntry *t_next, *t_current = m_first;
         while (t_current) {
             t_next = t_current->next;
             delete t_current;
             t_current = t_next;
         }
     }
     void append(T *e)
     {
         PtrListEntry *t_last = 0, *t_current = m_first;
         int count = 0;
         while (t_current) {
             if (t_current->insert(e)) {
                 return;
             }
             t_last = t_current;
             t_current = t_current->next;
             count++;
         }
         // Create new hash-set
         unsigned int newsize = m_first->log_size + 1;
         if (newsize > MAX_PTRLIST_SIZE) {
             newsize = MAX_PTRLIST_SIZE;
         }
         t_current = new PtrListEntry(newsize);
         bool t = t_current->insert(e);
         assert(t);
         // Prepend it to the list, for insert effeciency
         t_current->next = m_first;
         m_first = t_current;
         // ### rehash some of the smaller sets
         /*
         if (count > 4) {
             // rehash the last in the new
             t_current->insert(t_last);
         }*/
     }
     void remove(T *e)
     {
         PtrListEntry *t_next, *t_last = 0, *t_current = m_first;
         // Remove has to check every PtrEntry.
         while (t_current) {
             t_next = t_current->next;
             if (t_current->remove(e) && t_current->isEmpty()) {
                 if (t_last) {
                     t_last->next = t_current->next;
                 } else {
                     assert(m_first == t_current);
                     m_first = t_current->next;
                 }
                 delete t_current;
             } else {
                 t_last = t_current;
             }
             t_current = t_next;
         }
     }
     bool contains(T *e)
     {
         PtrListEntry *t_current = m_first;
         while (t_current) {
             if (t_current->contains(e)) {
                 return true;
             }
             t_current = t_current->next;
         }
         return false;
     }
     bool isEmpty()
     {
         if (!m_first) {
             return true;
         }
         PtrListEntry *t_current = m_first;
         while (t_current) {
             if (!t_current->isEmpty()) {
                 return false;
             }
             t_current = t_current->next;
         }
         return true;
     }
     unsigned int count() const
     {
         unsigned int t_count = 0;
         PtrListEntry *t_current = m_first;
         while (t_current) {
             t_count += t_current->count;
             t_current = t_current->next;
         }
         return t_count;
     }
 // Iterator functions:
     T *first()
     {
         m_current = m_first;
         m_pos = 0;
         // skip holes
         if (m_current && !m_current->at(m_pos)) {
             return next();
         } else {
             return current();
         }
     }
     T *current()
     {
         if (!m_current) {
             return (T *)0;
         } else {
             return (T *)m_current->at(m_pos);
         }
     }
     T *next()
     {
         if (!m_current) {
             return (T *)0;
         }
         m_pos++;
         if (m_pos >= m_current->size()) {
             m_current = m_current->next;
             m_pos = 0;
         }
         // skip holes
         if (m_current && !m_current->at(m_pos)) {
             return next();
         } else {
             return current();
         }
     }
 private:
     PtrListEntry *m_first;
 // iteration:
     PtrListEntry *m_current;
     unsigned int m_pos;
 };
 
 #undef START_PTRLIST_SIZE
 #undef MAX_PTRLIST_SIZE
 #endif