How to search Node?

[Wong]

Hello everyone,

I want to search node by tags. The code I wrote is shown below:

simulation::Node* node = context->get<simulation::Node>(this->getTags(), sofa::core::objectmodel::BaseContext::SearchRoot);

However, it does not work. The value of the node is still NULL after all.

What is the problem?

Wong

[jnbrunet]

Hi Wong,

The “get” function from the Context class only search for components contained inside a Node, but not the nodes themselves. Unfortunately, I don’t think such search function for nodes exists. You can however convert your current context to a “DAGNode”:

#include <SofaSimulationGraph/DAGNode.h>
auto DNode = dynamic_cast<const sofa::simulation::graph::DAGNode *> (context);

And then, use the following methods from your DAGNode to traverse the simulation tree:

sofa::helper::vector< BaseNode* > getParents() const override;
BaseNode* getFirstParent() const;
sofa::helper::vector< BaseNode* >  getChildren() const override;
bool hasTag( Tag t ) const;
const TagSet& getTags() const;

Hope this helps,
Jean-Nicolas

[Author]

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