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150 lines
4.3 KiB
150 lines
4.3 KiB
/* GSL Glib Hashtable implementation
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* Copyright (C) 2001 Stefan Westerfeld
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "gslglib.h"
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#include <list>
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#include <map>
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using std::list;
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using std::pair;
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using std::map;
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/*
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* this uses a map of list to emulate somewhat hashtable like behaviour - note
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* that insert and remove are O(log N) due to the use of a map, instead of
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* ~ O(1) which they would be for a "real" hashtable
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*/
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struct _GHashTable
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{
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GHashFunc hashFunc;
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GEqualFunc equalFunc;
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map<guint /*hashvalue for key*/, list< pair<gpointer,gpointer> > /*(key,value) pairs*/> nodes;
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/*Con*/ _GHashTable (GHashFunc hf, GEqualFunc ef) :
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hashFunc(hf), equalFunc(ef) { }
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};
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GHashTable* g_hash_table_new (GHashFunc hash_func,
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GEqualFunc key_equal_func)
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{
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return new GHashTable (hash_func?hash_func:g_direct_hash, key_equal_func?key_equal_func:g_direct_equal);
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}
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void g_hash_table_destroy (GHashTable *hash_table)
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{
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g_return_if_fail (hash_table != NULL);
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delete hash_table;
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}
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void g_hash_table_insert (GHashTable *hash_table,
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gpointer key,
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gpointer value)
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{
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g_return_if_fail (hash_table != NULL);
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guint hashvalue = hash_table->hashFunc (key);
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list< pair<gpointer,gpointer> >& bucket = hash_table->nodes[hashvalue];
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list< pair<gpointer,gpointer> >::iterator i;
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for (i = bucket.begin(); i != bucket.end(); i++)
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{
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if (hash_table->equalFunc(i->first, key))
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{
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if (value || TRUE)
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{
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i->second = value; /* overwrite old hash value */
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return;
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}
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else
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{
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bucket.erase(i); /* remove value */
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if (bucket.empty()) /* remove bucket if this was the only value */
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hash_table->nodes.erase (hashvalue);
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return;
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}
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}
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}
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if (value)
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hash_table->nodes[hashvalue].push_back(std::make_pair (key, value));
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}
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gpointer g_hash_table_lookup (GHashTable *hash_table,
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gconstpointer key)
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{
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g_return_val_if_fail (hash_table != NULL, NULL);
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guint hashvalue = hash_table->hashFunc (key);
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list< pair<gpointer,gpointer> >& bucket = hash_table->nodes[hashvalue];
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list< pair<gpointer,gpointer> >::iterator i;
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for (i = bucket.begin(); i != bucket.end(); i++)
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{
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if (hash_table->equalFunc(i->first, key))
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return i->second;
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}
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return 0;
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}
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gboolean g_hash_table_remove (GHashTable *hash_table,
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gconstpointer key)
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{
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g_return_val_if_fail (hash_table != NULL, FALSE);
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guint hashvalue = hash_table->hashFunc (key);
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list< pair<gpointer,gpointer> >& bucket = hash_table->nodes[hashvalue];
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list< pair<gpointer,gpointer> >::iterator i;
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for (i = bucket.begin(); i != bucket.end(); i++)
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{
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if (hash_table->equalFunc(i->first, key))
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{
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bucket.erase (i);
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if (bucket.empty()) /* remove bucket if this was the only value */
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hash_table->nodes.erase (hashvalue);
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return true;
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}
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}
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return false;
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}
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void g_hash_table_foreach (GHashTable *hash_table,
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GHFunc func,
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gpointer user_data)
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{
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map<guint, list< pair<gpointer,gpointer> > >::iterator bi;
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g_return_if_fail (hash_table != NULL);
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/* for all buckets */
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for (bi = hash_table->nodes.begin (); bi != hash_table->nodes.end (); bi++)
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{
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list< pair<gpointer,gpointer> >& bucket = bi->second;
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list< pair<gpointer,gpointer> >::iterator i;
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/* for each element in the current bucket */
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for (i = bucket.begin(); i != bucket.end(); i++)
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func ((void*) i->first, (void*) i->second, user_data);
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}
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}
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