C++ NodeMetadata类代码示例

void NodeMetadataList::serialize(std::ostream &os) const
{
	/*
		Version 0 is a placeholder for "nothing to see here; go away."
	*/

	if(m_data.empty()){
		writeU8(os, 0); // version
		return;
	}

	writeU8(os, 1); // version

	u16 count = m_data.size();
	writeU16(os, count);

	for(std::map<v3s16, NodeMetadata*>::const_iterator
			i = m_data.begin();
			i != m_data.end(); ++i)
	{
		v3s16 p = i->first;
		NodeMetadata *data = i->second;

		u16 p16 = p.Z * MAP_BLOCKSIZE * MAP_BLOCKSIZE + p.Y * MAP_BLOCKSIZE + p.X;
		writeU16(os, p16);

		data->serialize(os);
	}
}

// from_table(self, table)
bool NodeMetaRef::handleFromTable(lua_State *L, int table, Metadata *_meta)
{
	// fields
	if (!MetaDataRef::handleFromTable(L, table, _meta))
		return false;

	NodeMetadata *meta = (NodeMetadata*) _meta;

	// inventory
	Inventory *inv = meta->getInventory();
	lua_getfield(L, table, "inventory");
	if (lua_istable(L, -1)) {
		int inventorytable = lua_gettop(L);
		lua_pushnil(L);
		while (lua_next(L, inventorytable) != 0) {
			// key at index -2 and value at index -1
			std::string name = lua_tostring(L, -2);
			read_inventory_list(L, -1, inv, name.c_str(), getServer(L));
			lua_pop(L, 1); // Remove value, keep key for next iteration
		}
		lua_pop(L, 1);
	}

	return true;
}

Inventory* Client::getInventory(InventoryContext *c, std::string id)
{
	if(id == "current_player")
	{
		assert(c->current_player);
		return &(c->current_player->inventory);
	}

	Strfnd fn(id);
	std::string id0 = fn.next(":");

	if(id0 == "nodemeta")
	{
		v3s16 p;
		p.X = stoi(fn.next(","));
		p.Y = stoi(fn.next(","));
		p.Z = stoi(fn.next(","));
		NodeMetadata* meta = getNodeMetadata(p);
		if(meta)
			return meta->getInventory();
		infostream<<"nodemeta at ("<<p.X<<","<<p.Y<<","<<p.Z<<"): "
				<<"no metadata found"<<std::endl;
		return NULL;
	}

	infostream<<__FUNCTION_NAME<<": unknown id "<<id<<std::endl;
	return NULL;
}

NodeMetadata *NodeMetadataList::getClone(v3s16 p)
{
	JMutexAutoLock lock(m_mutex);
	NodeMetadata *data = get(p);
	if (!data)
		return NULL;

	return data->clone();
}

RollbackNode::RollbackNode(Map *map, v3s16 p, IGameDef *gamedef)
{
	INodeDefManager *ndef = gamedef->ndef();
	MapNode n = map->getNodeNoEx(p);
	name = ndef->get(n).name;
	param1 = n.param1;
	param2 = n.param2;
	NodeMetadata *metap = map->getNodeMetadata(p);
	if (metap) {
		std::ostringstream os(std::ios::binary);
		metap->serialize(os);
		meta = os.str();
	}
}

// get_string(self, name)
int NodeMetaRef::l_get_string(lua_State *L)
{
	NodeMetaRef *ref = checkobject(L, 1);
	std::string name = luaL_checkstring(L, 2);

	NodeMetadata *meta = getmeta(ref, false);
	if(meta == NULL){
		lua_pushlstring(L, "", 0);
		return 1;
	}
	std::string str = meta->getString(name);
	lua_pushlstring(L, str.c_str(), str.size());
	return 1;
}

// from_table(self, table)
int NodeMetaRef::l_from_table(lua_State *L)
{
	MAP_LOCK_REQUIRED;

	NodeMetaRef *ref = checkobject(L, 1);
	int base = 2;

	// clear old metadata first
	ref->m_env->getMap().removeNodeMetadata(ref->m_p);

	if(lua_isnil(L, base)){
		// No metadata
		lua_pushboolean(L, true);
		return 1;
	}

	// Create new metadata
	NodeMetadata *meta = getmeta(ref, true);
	if(meta == NULL){
		lua_pushboolean(L, false);
		return 1;
	}
	// Set fields
	lua_getfield(L, base, "fields");
	int fieldstable = lua_gettop(L);
	lua_pushnil(L);
	while(lua_next(L, fieldstable) != 0){
		// key at index -2 and value at index -1
		std::string name = lua_tostring(L, -2);
		size_t cl;
		const char *cs = lua_tolstring(L, -1, &cl);
		std::string value(cs, cl);
		meta->setString(name, value);
		lua_pop(L, 1); // removes value, keeps key for next iteration
	}
	// Set inventory
	Inventory *inv = meta->getInventory();
	lua_getfield(L, base, "inventory");
	int inventorytable = lua_gettop(L);
	lua_pushnil(L);
	while(lua_next(L, inventorytable) != 0){
		// key at index -2 and value at index -1
		std::string name = lua_tostring(L, -2);
		read_inventory_list(L, -1, inv, name.c_str(), getServer(L));
		lua_pop(L, 1); // removes value, keeps key for next iteration
	}
	reportMetadataChange(ref);
	lua_pushboolean(L, true);
	return 1;
}

bool NodeMetadataList::stepCircuit(float dtime, v3s16 blockpos_nodes, ServerEnvironment *env)
{
	bool something_changed = false;
	for(core::map<v3s16, NodeMetadata*>::Iterator
			i = m_data.getIterator();
			i.atEnd()==false; i++)
	{
		v3s16 p = i.getNode()->getKey();
		NodeMetadata *meta = i.getNode()->getValue();
		bool changed = meta->stepCircuit(dtime, blockpos_nodes+p, env);
		if (changed)
			something_changed = true;
	}
	return something_changed;
}

void NodeMetadataList::deSerialize(std::istream &is, IGameDef *gamedef)
{
	m_data.clear();

	u8 version = readU8(is);
	
	if(version == 0){
		// Nothing
		return;
	}

	if(version != 1){
		infostream<<__FUNCTION_NAME<<": version "<<version<<" not supported"
				<<std::endl;
		throw SerializationError("NodeMetadataList::deSerialize");
	}

	u16 count = readU16(is);

	for(u16 i=0; i<count; i++)
	{
		u16 p16 = readU16(is);

		v3s16 p;
		p.Z = p16 / MAP_BLOCKSIZE / MAP_BLOCKSIZE;
		p16 &= MAP_BLOCKSIZE * MAP_BLOCKSIZE - 1;
		p.Y = p16 / MAP_BLOCKSIZE;
		p16 &= MAP_BLOCKSIZE - 1;
		p.X = p16;

		if(m_data.find(p) != m_data.end())
		{
			infostream<<"WARNING: NodeMetadataList::deSerialize(): "
					<<"already set data at position"
					<<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
					<<std::endl;
			continue;
		}

		NodeMetadata *data = new NodeMetadata(gamedef);
		data->deSerialize(is);
		m_data[p] = data;
	}
}

Inventory* Client::getInventory(const InventoryLocation &loc)
{
	switch(loc.type){
	case InventoryLocation::UNDEFINED:
	{}
	break;
	case InventoryLocation::CURRENT_PLAYER:
	{
		LocalPlayer *player = m_env.getLocalPlayer();
		assert(player);
		return &player->inventory;
	}
	break;
	case InventoryLocation::PLAYER:
	{
		// Check if we are working with local player inventory
		LocalPlayer *player = m_env.getLocalPlayer();
		if (!player || strcmp(player->getName(), loc.name.c_str()) != 0)
			return NULL;
		return &player->inventory;
	}
	break;
	case InventoryLocation::NODEMETA:
	{
		NodeMetadata *meta = m_env.getMap().getNodeMetadata(loc.p);
		if(!meta)
			return NULL;
		return meta->getInventory();
	}
	break;
	case InventoryLocation::DETACHED:
	{
		if (m_detached_inventories.count(loc.name) == 0)
			return NULL;
		return m_detached_inventories[loc.name];
	}
	break;
	default:
		FATAL_ERROR("Invalid inventory location type.");
		break;
	}
	return NULL;
}

void NodeMetadataList::deSerialize(std::istream &is, IItemDefManager *item_def_mgr)
{
	clear();

	u8 version = readU8(is);

	if (version == 0) {
		// Nothing
		return;
	}

	if (version != 1) {
		std::string err_str = std::string(FUNCTION_NAME)
			+ ": version " + itos(version) + " not supported";
		infostream << err_str << std::endl;
		throw SerializationError(err_str);
	}

	u16 count = readU16(is);

	for (u16 i=0; i < count; i++) {
		u16 p16 = readU16(is);

		v3s16 p;
		p.Z = p16 / MAP_BLOCKSIZE / MAP_BLOCKSIZE;
		p16 &= MAP_BLOCKSIZE * MAP_BLOCKSIZE - 1;
		p.Y = p16 / MAP_BLOCKSIZE;
		p16 &= MAP_BLOCKSIZE - 1;
		p.X = p16;

		if (m_data.find(p) != m_data.end()) {
			warningstream<<"NodeMetadataList::deSerialize(): "
					<<"already set data at position"
					<<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
					<<std::endl;
			continue;
		}

		NodeMetadata *data = new NodeMetadata(item_def_mgr);
		data->deSerialize(is);
		m_data[p] = data;
	}
}

void NodeMetaRef::handleToTable(lua_State *L, Metadata *_meta)
{
	// fields
	MetaDataRef::handleToTable(L, _meta);

	NodeMetadata *meta = (NodeMetadata*) _meta;

	// inventory
	lua_newtable(L);
	Inventory *inv = meta->getInventory();
	if (inv) {
		std::vector<const InventoryList *> lists = inv->getLists();
		for(std::vector<const InventoryList *>::const_iterator
				i = lists.begin(); i != lists.end(); ++i) {
			push_inventory_list(L, inv, (*i)->getName().c_str());
			lua_setfield(L, -2, (*i)->getName().c_str());
		}
	}
	lua_setfield(L, -2, "inventory");
}

void NodeMetadataList::serialize(std::ostream &os)
{
	u8 buf[6];

	u16 version = 1;
	writeU16(buf, version);
	os.write((char*)buf, 2);

	u16 count = m_data.size();
	writeU16(buf, count);
	os.write((char*)buf, 2);

	for (core::map<v3s16, NodeMetadata*>::Iterator i = m_data.getIterator(); i.atEnd()==false; i++) {
		v3s16 p = i.getNode()->getKey();
		NodeMetadata *data = i.getNode()->getValue();

		u16 p16 = p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X;
		writeU16(buf, p16);
		os.write((char*)buf, 2);

		data->serialize(os);
	}

}

// mark_as_private(self, <string> or {<string>, <string>, ...})
int NodeMetaRef::l_mark_as_private(lua_State *L)
{
	MAP_LOCK_REQUIRED;

	NodeMetaRef *ref = checkobject(L, 1);
	NodeMetadata *meta = dynamic_cast<NodeMetadata*>(ref->getmeta(true));
	assert(meta);

	if (lua_istable(L, 2)) {
		lua_pushnil(L);
		while (lua_next(L, 2) != 0) {
			// key at index -2 and value at index -1
			luaL_checktype(L, -1, LUA_TSTRING);
			meta->markPrivate(lua_tostring(L, -1), true);
			// removes value, keeps key for next iteration
			lua_pop(L, 1);
		}
	} else if (lua_isstring(L, 2)) {
		meta->markPrivate(lua_tostring(L, 2), true);
	}
	ref->reportMetadataChange();

	return 0;
}

bool RollbackAction::applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const
{
	try {
		switch (type) {
		case TYPE_NOTHING:
			return true;
		case TYPE_SET_NODE: {
			INodeDefManager *ndef = gamedef->ndef();
			// Make sure position is loaded from disk
			map->emergeBlock(getContainerPos(p, MAP_BLOCKSIZE), false);
			// Check current node
			MapNode current_node = map->getNodeNoEx(p);
			std::string current_name = ndef->get(current_node).name;
			// If current node not the new node, it's bad
			if (current_name != n_new.name) {
				return false;
			}
			// Create rollback node
			MapNode n(ndef, n_old.name, n_old.param1, n_old.param2);
			// Set rollback node
			try {
				if (!map->addNodeWithEvent(p, n)) {
					infostream << "RollbackAction::applyRevert(): "
						<< "AddNodeWithEvent failed at "
						<< PP(p) << " for " << n_old.name
						<< std::endl;
					return false;
				}
				if (n_old.meta.empty()) {
					map->removeNodeMetadata(p);
				} else {
					NodeMetadata *meta = map->getNodeMetadata(p);
					if (!meta) {
						meta = new NodeMetadata(gamedef);
						if (!map->setNodeMetadata(p, meta)) {
							delete meta;
							infostream << "RollbackAction::applyRevert(): "
								<< "setNodeMetadata failed at "
								<< PP(p) << " for " << n_old.name
								<< std::endl;
							return false;
						}
					}
					std::istringstream is(n_old.meta, std::ios::binary);
					meta->deSerialize(is);
				}
				// Inform other things that the meta data has changed
				v3s16 blockpos = getContainerPos(p, MAP_BLOCKSIZE);
				MapEditEvent event;
				event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
				event.p = blockpos;
				map->dispatchEvent(&event);
				// Set the block to be saved
				MapBlock *block = map->getBlockNoCreateNoEx(blockpos);
				if (block) {
					block->raiseModified(MOD_STATE_WRITE_NEEDED,
						MOD_REASON_REPORT_META_CHANGE);
				}
			} catch (InvalidPositionException &e) {
				infostream << "RollbackAction::applyRevert(): "
					<< "InvalidPositionException: " << e.what()
					<< std::endl;
				return false;
			}
			// Success
			return true; }
		case TYPE_MODIFY_INVENTORY_STACK: {
			InventoryLocation loc;
			loc.deSerialize(inventory_location);
			std::string real_name = gamedef->idef()->getAlias(inventory_stack.name);
			Inventory *inv = imgr->getInventory(loc);
			if (!inv) {
				infostream << "RollbackAction::applyRevert(): Could not get "
					"inventory at " << inventory_location << std::endl;
				return false;
			}
			InventoryList *list = inv->getList(inventory_list);
			if (!list) {
				infostream << "RollbackAction::applyRevert(): Could not get "
					"inventory list \"" << inventory_list << "\" in "
					<< inventory_location << std::endl;
				return false;
			}
			if (list->getSize() <= inventory_index) {
				infostream << "RollbackAction::applyRevert(): List index "
					<< inventory_index << " too large in "
					<< "inventory list \"" << inventory_list << "\" in "
					<< inventory_location << std::endl;
			}
			// If item was added, take away item, otherwise add removed item
			if (inventory_add) {
				// Silently ignore different current item
				if (list->getItem(inventory_index).name != real_name)
					return false;
				list->takeItem(inventory_index, inventory_stack.count);
			} else {
				list->addItem(inventory_index, inventory_stack);
			}
			// Inventory was modified; send to clients
			imgr->setInventoryModified(loc);
//.........这里部分代码省略.........