src/nodemetadata.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "nodemetadata.h"
  21 #include "utility.h"
  22 #include "mapnode.h"
  23 #include "exceptions.h"
  24 #include "inventory.h"
  25 #include <sstream>
  26 #include "content_mapnode.h"
  27 #include "log.h"
  28
  29 /*
  30         NodeMetadata
  31 */
  32
  33 NodeMetadata::NodeMetadata(IGameDef *gamedef):
  34         m_gamedef(gamedef)
  35 {
  36 }
  37
  38 NodeMetadata::~NodeMetadata()
  39 {
  40 }
  41
  42 NodeMetadata* NodeMetadata::create(const std::string &name, IGameDef *gamedef)
  43 {
  44         // Find factory function
  45         core::map<std::string, Factory2>::Node *n;
  46         n = m_names.find(name);
  47         if(n == NULL)
  48         {
  49                 // If factory is not found, just return.
  50                 errorstream<<"WARNING: NodeMetadata: No factory for name=\""
  51                                 <<name<<"\""<<std::endl;
  52                 return NULL;
  53         }
  54
  55         // Try to load the metadata. If it fails, just return.
  56         try
  57         {
  58                 Factory2 f2 = n->getValue();
  59                 NodeMetadata *meta = (*f2)(gamedef);
  60                 return meta;
  61         }
  62         catch(SerializationError &e)
  63         {
  64                 errorstream<<"NodeMetadata: SerializationError "
  65                                 <<"while creating name=\""<<name<<"\""<<std::endl;
  66                 return NULL;
  67         }
  68 }
  69
  70 NodeMetadata* NodeMetadata::deSerialize(std::istream &is, IGameDef *gamedef)
  71 {
  72         // Read id
  73         u8 buf[2];
  74         is.read((char*)buf, 2);
  75         s16 id = readS16(buf);
  76
  77         // Read data
  78         std::string data = deSerializeString(is);
  79
  80         // Find factory function
  81         core::map<u16, Factory>::Node *n;
  82         n = m_types.find(id);
  83         if(n == NULL)
  84         {
  85                 // If factory is not found, just return.
  86                 infostream<<"WARNING: NodeMetadata: No factory for typeId="
  87                                 <<id<<std::endl;
  88                 return NULL;
  89         }
  90
  91         // Try to load the metadata. If it fails, just return.
  92         try
  93         {
  94                 std::istringstream iss(data, std::ios_base::binary);
  95
  96                 Factory f = n->getValue();
  97                 NodeMetadata *meta = (*f)(iss, gamedef);
  98                 return meta;
  99         }
 100         catch(SerializationError &e)
 101         {
 102                 infostream<<"WARNING: NodeMetadata: ignoring SerializationError"<<std::endl;
 103                 return NULL;
 104         }
 105 }
 106
 107 void NodeMetadata::serialize(std::ostream &os)
 108 {
 109         u8 buf[2];
 110         writeU16(buf, typeId());
 111         os.write((char*)buf, 2);
 112
 113         std::ostringstream oss(std::ios_base::binary);
 114         serializeBody(oss);
 115         os<<serializeString(oss.str());
 116 }
 117
 118 void NodeMetadata::registerType(u16 id, const std::string &name, Factory f,
 119                 Factory2 f2)
 120 {
 121         { // typeId
 122                 core::map<u16, Factory>::Node *n;
 123                 n = m_types.find(id);
 124                 if(!n)
 125                         m_types.insert(id, f);
 126         }
 127         { // typeName
 128                 core::map<std::string, Factory2>::Node *n;
 129                 n = m_names.find(name);
 130                 if(!n)
 131                         m_names.insert(name, f2);
 132         }
 133 }
 134
 135 /*
 136         NodeMetadataList
 137 */
 138
 139 void NodeMetadataList::serialize(std::ostream &os)
 140 {
 141         u8 buf[6];
 142
 143         u16 version = 1;
 144         writeU16(buf, version);
 145         os.write((char*)buf, 2);
 146
 147         u16 count = m_data.size();
 148         writeU16(buf, count);
 149         os.write((char*)buf, 2);
 150
 151         for(core::map<v3s16, NodeMetadata*>::Iterator
 152                         i = m_data.getIterator();
 153                         i.atEnd()==false; i++)
 154         {
 155                 v3s16 p = i.getNode()->getKey();
 156                 NodeMetadata *data = i.getNode()->getValue();
 157
 158                 u16 p16 = p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X;
 159                 writeU16(buf, p16);
 160                 os.write((char*)buf, 2);
 161
 162                 data->serialize(os);
 163         }
 164
 165 }
 166 void NodeMetadataList::deSerialize(std::istream &is, IGameDef *gamedef)
 167 {
 168         m_data.clear();
 169
 170         u8 buf[6];
 171
 172         is.read((char*)buf, 2);
 173         u16 version = readU16(buf);
 174
 175         if(version > 1)
 176         {
 177                 infostream<<__FUNCTION_NAME<<": version "<<version<<" not supported"
 178                                 <<std::endl;
 179                 throw SerializationError("NodeMetadataList::deSerialize");
 180         }
 181
 182         is.read((char*)buf, 2);
 183         u16 count = readU16(buf);
 184
 185         for(u16 i=0; i<count; i++)
 186         {
 187                 is.read((char*)buf, 2);
 188                 u16 p16 = readU16(buf);
 189
 190                 v3s16 p(0,0,0);
 191                 p.Z += p16 / MAP_BLOCKSIZE / MAP_BLOCKSIZE;
 192                 p16 -= p.Z * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 193                 p.Y += p16 / MAP_BLOCKSIZE;
 194                 p16 -= p.Y * MAP_BLOCKSIZE;
 195                 p.X += p16;
 196
 197                 NodeMetadata *data = NodeMetadata::deSerialize(is, gamedef);
 198
 199                 if(data == NULL)
 200                         continue;
 201
 202                 if(m_data.find(p))
 203                 {
 204                         infostream<<"WARNING: NodeMetadataList::deSerialize(): "
 205                                         <<"already set data at position"
 206                                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
 207                                         <<std::endl;
 208                         delete data;
 209                         continue;
 210                 }
 211
 212                 m_data.insert(p, data);
 213         }
 214 }
 215
 216 NodeMetadataList::~NodeMetadataList()
 217 {
 218         for(core::map<v3s16, NodeMetadata*>::Iterator
 219                         i = m_data.getIterator();
 220                         i.atEnd()==false; i++)
 221         {
 222                 delete i.getNode()->getValue();
 223         }
 224 }
 225
 226 NodeMetadata* NodeMetadataList::get(v3s16 p)
 227 {
 228         core::map<v3s16, NodeMetadata*>::Node *n;
 229         n = m_data.find(p);
 230         if(n == NULL)
 231                 return NULL;
 232         return n->getValue();
 233 }
 234
 235 void NodeMetadataList::remove(v3s16 p)
 236 {
 237         NodeMetadata *olddata = get(p);
 238         if(olddata)
 239         {
 240                 delete olddata;
 241                 m_data.remove(p);
 242         }
 243 }
 244
 245 void NodeMetadataList::set(v3s16 p, NodeMetadata *d)
 246 {
 247         remove(p);
 248         m_data.insert(p, d);
 249 }
 250
 251 bool NodeMetadataList::step(float dtime)
 252 {
 253         bool something_changed = false;
 254         for(core::map<v3s16, NodeMetadata*>::Iterator
 255                         i = m_data.getIterator();
 256                         i.atEnd()==false; i++)
 257         {
 258                 v3s16 p = i.getNode()->getKey();
 259                 NodeMetadata *meta = i.getNode()->getValue();
 260                 bool changed = meta->step(dtime);
 261                 if(changed)
 262                         something_changed = true;
 263         }
 264         return something_changed;
 265 }
 266