C++ SPtr::add方法代码示例

bool
CreateBlock::pre_process()
{
	typedef Resource::Properties::const_iterator iterator;

	const Ingen::URIs& uris  = _engine.world()->uris();
	const SPtr<Store>  store = _engine.store();

	// Check sanity of target path
	if (_path.is_root()) {
		return Event::pre_process_done(Status::BAD_URI, _path);
	} else if (store->get(_path)) {
		return Event::pre_process_done(Status::EXISTS, _path);
	} else if (!(_graph = dynamic_cast<GraphImpl*>(store->get(_path.parent())))) {
		return Event::pre_process_done(Status::PARENT_NOT_FOUND, _path.parent());
	}

	// Map old ingen:prototype to new lv2:prototype
	auto range = _properties.equal_range(uris.ingen_prototype);
	for (auto i = range.first; i != range.second;) {
		const auto value = i->second;
		auto       next  = i;
		next = _properties.erase(i);
		_properties.insert(std::make_pair(uris.lv2_prototype, value));
		i = next;
	}

	// Get prototype
	iterator t = _properties.find(uris.lv2_prototype);
	if (t == _properties.end() || !uris.forge.is_uri(t->second)) {
		// Missing/invalid prototype
		return Event::pre_process_done(Status::BAD_REQUEST);
	}

	const Raul::URI prototype(uris.forge.str(t->second, false));

	// Find polyphony
	const iterator p          = _properties.find(uris.ingen_polyphonic);
	const bool     polyphonic = (p != _properties.end() &&
	                             p->second.type() == uris.forge.Bool &&
	                             p->second.get<int32_t>());

	// Find and instantiate/duplicate prototype (plugin/existing node)
	if (Node::uri_is_path(prototype)) {
		// Prototype is an existing block
		BlockImpl* const ancestor = dynamic_cast<BlockImpl*>(
			store->get(Node::uri_to_path(prototype)));
		if (!ancestor) {
			return Event::pre_process_done(Status::PROTOTYPE_NOT_FOUND, prototype);
		} else if (!(_block = ancestor->duplicate(
			             _engine, Raul::Symbol(_path.symbol()), _graph))) {
			return Event::pre_process_done(Status::CREATION_FAILED, _path);
		}

		/* Replace prototype with the ancestor's.  This is less informative,
		   but the client expects an actual LV2 plugin as prototype. */
		_properties.erase(uris.ingen_prototype);
		_properties.erase(uris.lv2_prototype);
		_properties.insert(std::make_pair(uris.lv2_prototype,
		                                  uris.forge.make_urid(ancestor->plugin()->uri())));
	} else {
		// Prototype is a plugin
		PluginImpl* const plugin = _engine.block_factory()->plugin(prototype);
		if (!plugin) {
			return Event::pre_process_done(Status::PROTOTYPE_NOT_FOUND, prototype);
		} else if (!(_block = plugin->instantiate(*_engine.buffer_factory(),
		                                          Raul::Symbol(_path.symbol()),
		                                          polyphonic,
		                                          _graph,
		                                          _engine))) {
			return Event::pre_process_done(Status::CREATION_FAILED, _path);
		}
	}

	// Activate block
	_block->properties().insert(_properties.begin(), _properties.end());
	_block->activate(*_engine.buffer_factory());

	// Add block to the store and the graph's pre-processor only block list
	_graph->add_block(*_block);
	store->add(_block);

	/* Compile graph with new block added for insertion in audio thread
	   TODO: Since the block is not connected at this point, a full compilation
	   could be avoided and the block simply appended. */
	if (_graph->enabled()) {
		_compiled_graph = _graph->compile();
	}

	_update.put_block(_block);

	return Event::pre_process_done(Status::SUCCESS);
}