bool mitk::SceneReaderV1::LoadScene( TiXmlDocument& document, const std::string& workingDirectory, DataStorage* storage )
{
assert(storage);
bool error(false);
// TODO prepare to detect errors (such as cycles) from wrongly written or edited xml files
//Get number of elements to initialze progress bar
// 1. if there is a <data type="..." file="..."> element,
// - construct a name for the appropriate serializer
// - try to instantiate this serializer via itk object factory
// - if serializer could be created, use it to read the file into a BaseData object
// - if successful, call the new node's SetData(..)
// create a node for the tag "data" and test if node was created
typedef std::vector<mitk::DataNode::Pointer> DataNodeVector;
DataNodeVector DataNodes;
unsigned int listSize = 0;
for( TiXmlElement* element = document.FirstChildElement("node"); element != NULL; element = element->NextSiblingElement("node") )
{
++listSize;
}
ProgressBar::GetInstance()->AddStepsToDo(listSize * 2);
for (TiXmlElement* element = document.FirstChildElement("node"); element != NULL; element = element->NextSiblingElement("node"))
{
DataNodes.push_back(LoadBaseDataFromDataTag(element->FirstChildElement("data"), workingDirectory, error));
ProgressBar::GetInstance()->Progress();
}
// iterate all nodes
// first level nodes should be <node> elements
DataNodeVector::iterator nit = DataNodes.begin();
for( TiXmlElement* element = document.FirstChildElement("node"); element != NULL || nit != DataNodes.end(); element = element->NextSiblingElement("node"), ++nit )
{
mitk::DataNode::Pointer node = *nit;
// in case dataXmlElement is valid test whether it containts the "properties" child tag
// and process further if and only if yes
TiXmlElement *dataXmlElement = element->FirstChildElement("data");
if( dataXmlElement && dataXmlElement->FirstChildElement("properties") )
{
TiXmlElement *baseDataElement = dataXmlElement->FirstChildElement("properties");
if ( node->GetData() )
{
DecorateBaseDataWithProperties( node->GetData(), baseDataElement, workingDirectory);
}
else
{
MITK_WARN << "BaseData properties stored in scene file, but BaseData could not be read" << std::endl;
}
}
// 2. check child nodes
const char* uida = element->Attribute("UID");
std::string uid("");
if (uida)
{
uid = uida;
m_NodeForID[uid] = node.GetPointer();
m_IDForNode[ node.GetPointer() ] = uid;
}
else
{
MITK_ERROR << "No UID found for current node. Node will have no parents.";
error = true;
}
// 3. if there are <properties> nodes,
// - instantiate the appropriate PropertyListDeSerializer
// - use them to construct PropertyList objects
// - add these properties to the node (if necessary, use renderwindow name)
bool success = DecorateNodeWithProperties(node, element, workingDirectory);
if (!success)
{
MITK_ERROR << "Could not load properties for node.";
error = true;
}
// remember node for later adding to DataStorage
m_OrderedNodePairs.push_back( std::make_pair( node, std::list<std::string>() ) );
// 4. if there are <source> elements, remember parent objects
for( TiXmlElement* source = element->FirstChildElement("source"); source != NULL; source = source->NextSiblingElement("source") )
{
const char* sourceUID = source->Attribute("UID");
if (sourceUID)
{
m_OrderedNodePairs.back().second.push_back( std::string(sourceUID) );
}
}
ProgressBar::GetInstance()->Progress();
} // end for all <node>
// sort our nodes by their "layer" property
// (to be inserted in that order)
m_OrderedNodePairs.sort( &NodeSortByLayerIsLessThan );
// remove all unknown parent UIDs
for (OrderedNodesList::iterator nodesIter = m_OrderedNodePairs.begin();
nodesIter != m_OrderedNodePairs.end();
++nodesIter)
{
for (std::list<std::string>::iterator parentsIter = nodesIter->second.begin();
parentsIter != nodesIter->second.end();)
{
if (m_NodeForID.find( *parentsIter ) == m_NodeForID.end())
{
parentsIter = nodesIter->second.erase( parentsIter );
MITK_WARN << "Found a DataNode with unknown parents. Will add it to DataStorage without any parent objects.";
error = true;
}
else
{
++parentsIter;
}
}
}
// repeat the following loop ...
// ... for all created nodes
unsigned int lastMapSize(0);
while ( lastMapSize != m_OrderedNodePairs.size()) // this is to prevent infinite loops; each iteration must at least add one node to DataStorage
{
lastMapSize = m_OrderedNodePairs.size();
// iterate (layer) ordered nodes backwards
// we insert the highest layers first
for (OrderedNodesList::iterator nodesIter = m_OrderedNodePairs.begin();
nodesIter != m_OrderedNodePairs.end();
++nodesIter)
{
bool addThisNode(true);
// if any parent node is not yet in DataStorage, skip node for now and check later
for (std::list<std::string>::iterator parentsIter = nodesIter->second.begin();
parentsIter != nodesIter->second.end();
++parentsIter)
{
if ( !storage->Exists( m_NodeForID[ *parentsIter ] ) )
{
addThisNode = false;
break;
}
}
if (addThisNode)
{
DataStorage::SetOfObjects::Pointer parents = DataStorage::SetOfObjects::New();
for ( std::list<std::string>::iterator parentsIter = nodesIter->second.begin();
parentsIter != nodesIter->second.end();
++parentsIter )
{
parents->push_back(m_NodeForID[*parentsIter]);
}
// if all parents are found in datastorage (or are unknown), add node to DataStorage
storage->Add(nodesIter->first, parents);
// remove this node from m_OrderedNodePairs
m_OrderedNodePairs.erase( nodesIter );
// break this for loop because iterators are probably invalid
break;
}
}
}
// All nodes that are still in m_OrderedNodePairs at this point are not part of a proper directed graph structure. We'll add such nodes without any parent information.
for (OrderedNodesList::iterator nodesIter = m_OrderedNodePairs.begin();
nodesIter != m_OrderedNodePairs.end();
++nodesIter)
{
storage->Add( nodesIter->first );
MITK_WARN << "Encountered node that is not part of a directed graph structure. Will be added to DataStorage without parents.";
error = true;
}
return !error;
}
bool mitk::SceneReaderV1::LoadScene( TiXmlDocument& document, const std::string& workingDirectory, DataStorage* storage )
{
assert(storage);
bool error(false);
// TODO prepare to detect errors (such as cycles) from wrongly written or edited xml files
// iterate all nodes
// first level nodes should be <node> elements
for( TiXmlElement* element = document.FirstChildElement("node"); element != NULL; element = element->NextSiblingElement("node") )
{
// 1. if there is a <data type="..." file="..."> element,
// - construct a name for the appropriate serializer
// - try to instantiate this serializer via itk object factory
// - if serializer could be created, use it to read the file into a BaseData object
// - if successful, call the new node's SetData(..)
DataNode::Pointer node = LoadBaseDataFromDataTag( element->FirstChildElement("data"), workingDirectory, error );
// 2. check child nodes
const char* uida = element->Attribute("UID");
std::string uid("");
if (uida)
{
uid = uida;
m_NodeForID[uid] = node.GetPointer();
m_IDForNode[ node.GetPointer() ] = uid;
}
else
{
MITK_ERROR << "No UID found for current node. Node will have no parents.";
error = true;
}
// remember node for later adding to DataStorage
m_Nodes.insert( std::make_pair( node, std::list<std::string>() ) );
// 3. if there are <source> elements, remember parent objects
for( TiXmlElement* source = element->FirstChildElement("source"); source != NULL; source = source->NextSiblingElement("source") )
{
const char* sourceUID = source->Attribute("UID");
if (sourceUID)
{
m_Nodes[node].push_back( std::string(sourceUID) );
}
}
// 5. if there are <properties> nodes,
// - instantiate the appropriate PropertyListDeSerializer
// - use them to construct PropertyList objects
// - add these properties to the node (if necessary, use renderwindow name)
bool success = DecorateNodeWithProperties(node, element, workingDirectory);
if (!success)
{
MITK_ERROR << "Could not load properties for node.";
error = true;
}
} // end for all <node>
// remove all unknown parent UIDs
for (NodesAndParentsMapType::iterator nodesIter = m_Nodes.begin();
nodesIter != m_Nodes.end();
++nodesIter)
{
for (std::list<std::string>::iterator parentsIter = nodesIter->second.begin();
parentsIter != nodesIter->second.end();)
{
if (m_NodeForID.find( *parentsIter ) == m_NodeForID.end())
{
parentsIter = nodesIter->second.erase( parentsIter );
MITK_WARN << "Found a DataNode with unknown parents. Will add it to DataStorage without any parent objects.";
error = true;
}
else
{
++parentsIter;
}
}
}
// repeat
// for all created nodes
unsigned int lastMapSize(0);
while ( lastMapSize != m_Nodes.size()) // this is to prevent infinite loops; each iteration must at least add one node to DataStorage
{
lastMapSize = m_Nodes.size();
for (NodesAndParentsMapType::iterator nodesIter = m_Nodes.begin();
nodesIter != m_Nodes.end();
++nodesIter)
{
bool addNow(true);
// if any parent node is not yet in DataStorage, skip node for now and check later
for (std::list<std::string>::iterator parentsIter = nodesIter->second.begin();
parentsIter != nodesIter->second.end();
++parentsIter)
{
if ( !storage->Exists( m_NodeForID[ *parentsIter ] ) )
{
addNow = false;
break;
}
}
if (addNow)
{
DataStorage::SetOfObjects::Pointer parents = DataStorage::SetOfObjects::New();
for (std::list<std::string>::iterator parentsIter = nodesIter->second.begin();
parentsIter != nodesIter->second.end();
++parentsIter)
{
parents->push_back( m_NodeForID[ *parentsIter ] );
}
// if all parents are found in datastorage (or are unknown), add node to DataStorage
storage->Add( nodesIter->first, parents );
// remove this node from m_Nodes
m_Nodes.erase( nodesIter );
// break this for loop because iterators are probably invalid
break;
}
}
}
// All nodes that are still in m_Nodes at this point are not part of a proper directed graph structure. We'll add such nodes without any parent information.
for (NodesAndParentsMapType::iterator nodesIter = m_Nodes.begin();
nodesIter != m_Nodes.end();
++nodesIter)
{
storage->Add( nodesIter->first );
MITK_WARN << "Encountered node that is not part of a directed graph structure. Will be added to DataStorage without parents.";
error = true;
}
return !error;
}
