class DataCollectorExtension extends

buildFinalFormTree(FormInterface $form,

string getBlockPrefix() Returns the prefix of the template block name for this type.

FormView createView(

buildView(FormView $view,

class ResolvedTypeFactoryDataCollectorProxy implements

array extractDefaultData(FormInterface $form)

array extractViewVariables(FormView $view)

collectSubmittedData(FormInterface $form)

string getExtendedType() Returns the name of the type being extended.