cee::ug::DataSource

class DataSource : public RefCountedObject 

The data source of the model.

For instance a file interface or custom built by the user.

The data source contains a collection of all states for one analysis. Each state groups together geometries and results for one time step, load case, frequency etc.

Each unstructured grid model owns one data source.

../_images/uml_datasource.png

DataSource is the parent class for all data sources and cannot be instantiated. DataSource contains general functions that applies to all data source types. To create a data source, use one of the subclassed versions. The data source can, for instance, be read from a supported interface or be created “by hand” from within the application.

See DataSourceInterface and DataSourceMemory.

The data source also has a directory describing the metadata for this model (DataSourceDirectory). This metadata is mostly used by the interface system.

The data source is identified with a unique id set upon construction of the object. Use id() to get the id of an existing data source.

States and directory is managed from the inherited data source classes and the main DataSource class only contains const function for querying state and directory. Get number of states using stateCount() and access individual states by calling state() with the requested state index. (For convenience, the stateIndex() function is available to convert from a state id to a state index).

In addition DataSource offers the isDataSourceValid() function to check if the data source content matches the metadata.

A DataSource has a collection of DataElementSet. These element sets are groups of elements from from different parts and geometries within the DataSource. The element sets can be used for specifying which elements that should be visible. The sets to use for filtering are specified in the ModelSpec::setVisibleSetIds() method.

Example - Creating a memory data source

Example on building your data source and geometry.

Create a model and a memory data source. The constructor of the data source takes a unique id and the number of geometries (here 1). Set the data source in the created model.

cee::PtrRef<cee::ug::UnstructGridModel> ugModel = new cee::ug::UnstructGridModel();
cee::PtrRef<cee::ug::DataSourceMemory> dataSource = new cee::ug::DataSourceMemory(1, 1);
ugModel->setDataSource(dataSource.get());

Create the state. Set number of geometries to 1 in the constructor.

int stateId = 1;
cee::PtrRef<cee::ug::DataState> state = new cee::ug::DataState(stateId, 1);
dataSource->addState(state.get());

See the complete source code at: UnstructGrid: Simple Model with Two Triangles

Example - Reading model from file

Example on reading a model from a file interface.

Create the model and VTFx file interface data source.

Give the data source a unique id.

cee::PtrRef<cee::ug::UnstructGridModel> ugModel = new cee::ug::UnstructGridModel();
cee::PtrRef<cee::ug::DataSourceVTFx> source = new cee::ug::DataSourceVTFx(42);

Open the test file (contact.vtfx) included in the tutorial data files. The open() function will return true if the file was opened successfully.

Set the data source in the model.

cee::Str vtfxFile = TutorialUtils::testDataDir() + "contact.vtfx";
if (!source->open(vtfxFile))
{
    // VTFx file not found
    return;
}
ugModel->setDataSource(source.get());

If the file was read successfully, you will now have a complete data source with one or more states.

State info and other metadata will be available through the data source’s directory.

See the complete source code at: UnstructGrid: Load Model from File and Set Up Model Specification

Tutorials