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 core::map<u16, NodeMetadata::Factory> NodeMetadata::m_types;
  34 core::map<std::string, NodeMetadata::Factory2> NodeMetadata::m_names;
  35
  36 NodeMetadata::NodeMetadata(IGameDef *gamedef):
  37         m_gamedef(gamedef)
  38 {
  39 }
  40
  41 NodeMetadata::~NodeMetadata()
  42 {
  43 }
  44
  45 NodeMetadata* NodeMetadata::create(const std::string &name, IGameDef *gamedef)
  46 {
  47         // Find factory function
  48         core::map<std::string, Factory2>::Node *n;
  49         n = m_names.find(name);
  50         if(n == NULL)
  51         {
  52                 // If factory is not found, just return.
  53                 errorstream<<"WARNING: NodeMetadata: No factory for name=\""
  54                                 <<name<<"\""<<std::endl;
  55                 return NULL;
  56         }
  57
  58         // Try to load the metadata. If it fails, just return.
  59         try
  60         {
  61                 Factory2 f2 = n->getValue();
  62                 NodeMetadata *meta = (*f2)(gamedef);
  63                 return meta;
  64         }
  65         catch(SerializationError &e)
  66         {
  67                 errorstream<<"NodeMetadata: SerializationError "
  68                                 <<"while creating name=\""<<name<<"\""<<std::endl;
  69                 return NULL;
  70         }
  71 }
  72
  73 NodeMetadata* NodeMetadata::deSerialize(std::istream &is, IGameDef *gamedef)
  74 {
  75         // Read id
  76         u8 buf[2];
  77         is.read((char*)buf, 2);
  78         s16 id = readS16(buf);
  79
  80         // Read data
  81         std::string data = deSerializeString(is);
  82
  83         // Find factory function
  84         core::map<u16, Factory>::Node *n;
  85         n = m_types.find(id);
  86         if(n == NULL)
  87         {
  88                 // If factory is not found, just return.
  89                 infostream<<"WARNING: NodeMetadata: No factory for typeId="
  90                                 <<id<<std::endl;
  91                 return NULL;
  92         }
  93
  94         // Try to load the metadata. If it fails, just return.
  95         try
  96         {
  97                 std::istringstream iss(data, std::ios_base::binary);
  98
  99                 Factory f = n->getValue();
 100                 NodeMetadata *meta = (*f)(iss, gamedef);
 101                 return meta;
 102         }
 103         catch(SerializationError &e)
 104         {
 105                 infostream<<"WARNING: NodeMetadata: ignoring SerializationError"<<std::endl;
 106                 return NULL;
 107         }
 108 }
 109
 110 void NodeMetadata::serialize(std::ostream &os)
 111 {
 112         u8 buf[2];
 113         writeU16(buf, typeId());
 114         os.write((char*)buf, 2);
 115
 116         std::ostringstream oss(std::ios_base::binary);
 117         serializeBody(oss);
 118         os<<serializeString(oss.str());
 119 }
 120
 121 void NodeMetadata::registerType(u16 id, const std::string &name, Factory f,
 122                 Factory2 f2)
 123 {
 124         { // typeId
 125                 core::map<u16, Factory>::Node *n;
 126                 n = m_types.find(id);
 127                 if(!n)
 128                         m_types.insert(id, f);
 129         }
 130         { // typeName
 131                 core::map<std::string, Factory2>::Node *n;
 132                 n = m_names.find(name);
 133                 if(!n)
 134                         m_names.insert(name, f2);
 135         }
 136 }
 137
 138 /*
 139         NodeMetadataList
 140 */
 141
 142 void NodeMetadataList::serialize(std::ostream &os)
 143 {
 144         u8 buf[6];
 145
 146         u16 version = 1;
 147         writeU16(buf, version);
 148         os.write((char*)buf, 2);
 149
 150         u16 count = m_data.size();
 151         writeU16(buf, count);
 152         os.write((char*)buf, 2);
 153
 154         for(core::map<v3s16, NodeMetadata*>::Iterator
 155                         i = m_data.getIterator();
 156                         i.atEnd()==false; i++)
 157         {
 158                 v3s16 p = i.getNode()->getKey();
 159                 NodeMetadata *data = i.getNode()->getValue();
 160
 161                 u16 p16 = p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X;
 162                 writeU16(buf, p16);
 163                 os.write((char*)buf, 2);
 164
 165                 data->serialize(os);
 166         }
 167
 168 }
 169 void NodeMetadataList::deSerialize(std::istream &is, IGameDef *gamedef)
 170 {
 171         m_data.clear();
 172
 173         u8 buf[6];
 174
 175         is.read((char*)buf, 2);
 176         u16 version = readU16(buf);
 177
 178         if(version > 1)
 179         {
 180                 infostream<<__FUNCTION_NAME<<": version "<<version<<" not supported"
 181                                 <<std::endl;
 182                 throw SerializationError("NodeMetadataList::deSerialize");
 183         }
 184
 185         is.read((char*)buf, 2);
 186         u16 count = readU16(buf);
 187
 188         for(u16 i=0; i<count; i++)
 189         {
 190                 is.read((char*)buf, 2);
 191                 u16 p16 = readU16(buf);
 192
 193                 v3s16 p(0,0,0);
 194                 p.Z += p16 / MAP_BLOCKSIZE / MAP_BLOCKSIZE;
 195                 p16 -= p.Z * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 196                 p.Y += p16 / MAP_BLOCKSIZE;
 197                 p16 -= p.Y * MAP_BLOCKSIZE;
 198                 p.X += p16;
 199
 200                 NodeMetadata *data = NodeMetadata::deSerialize(is, gamedef);
 201
 202                 if(data == NULL)
 203                         continue;
 204
 205                 if(m_data.find(p))
 206                 {
 207                         infostream<<"WARNING: NodeMetadataList::deSerialize(): "
 208                                         <<"already set data at position"
 209                                         <<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
 210                                         <<std::endl;
 211                         delete data;
 212                         continue;
 213                 }
 214
 215                 m_data.insert(p, data);
 216         }
 217 }
 218
 219 NodeMetadataList::~NodeMetadataList()
 220 {
 221         for(core::map<v3s16, NodeMetadata*>::Iterator
 222                         i = m_data.getIterator();
 223                         i.atEnd()==false; i++)
 224         {
 225                 delete i.getNode()->getValue();
 226         }
 227 }
 228
 229 NodeMetadata* NodeMetadataList::get(v3s16 p)
 230 {
 231         core::map<v3s16, NodeMetadata*>::Node *n;
 232         n = m_data.find(p);
 233         if(n == NULL)
 234                 return NULL;
 235         return n->getValue();
 236 }
 237
 238 void NodeMetadataList::remove(v3s16 p)
 239 {
 240         NodeMetadata *olddata = get(p);
 241         if(olddata)
 242         {
 243                 delete olddata;
 244                 m_data.remove(p);
 245         }
 246 }
 247
 248 void NodeMetadataList::set(v3s16 p, NodeMetadata *d)
 249 {
 250         remove(p);
 251         m_data.insert(p, d);
 252 }
 253
 254 bool NodeMetadataList::step(float dtime)
 255 {
 256         bool something_changed = false;
 257         for(core::map<v3s16, NodeMetadata*>::Iterator
 258                         i = m_data.getIterator();
 259                         i.atEnd()==false; i++)
 260         {
 261                 v3s16 p = i.getNode()->getKey();
 262                 NodeMetadata *meta = i.getNode()->getValue();
 263                 bool changed = meta->step(dtime);
 264                 if(changed)
 265                         something_changed = true;
 266         }
 267         return something_changed;
 268 }
 269