void
UsdMayaAdaptor::UnapplySchemaByName(
const TfToken& schemaName,
MDGModifier& modifier)
{
if (!*this) {
TF_CODING_ERROR("Adaptor is not valid");
return;
}
// Remove from schema list.
TfTokenVector currentSchemas = GetAppliedSchemas();
currentSchemas.erase(
std::remove(
currentSchemas.begin(), currentSchemas.end(), schemaName),
currentSchemas.end());
if (currentSchemas.empty()) {
ClearMetadata(UsdTokens->apiSchemas, modifier);
}
else {
SetMetadata(
UsdTokens->apiSchemas,
_GetListOpForTokenVector(currentSchemas),
modifier);
}
}
bool
UsdPrim::_HasAPI(const TfType& schemaType, bool validateSchemaType) const
{
if (validateSchemaType) {
if (schemaType.IsUnknown()) {
TF_CODING_ERROR("Unknown schema type (%s) is invalid for HasAPI query",
schemaType.GetTypeName().c_str());
return false;
}
// Note that this is only hit in python code paths,
// C++ clients would hit the static_asserts defined in prim.h
auto schemaRegistry = UsdSchemaRegistry::GetInstance();
if (schemaRegistry.IsConcrete(schemaType)) {
TF_CODING_ERROR("Provided schema type must be non-concrete");
return false;
}
if (schemaRegistry.IsTyped(schemaType)) {
TF_CODING_ERROR("Provided schema type must be untyped");
return false;
}
}
// Get our composed set of applied schemas
static const auto usdSchemaBase = TfType::FindByName("UsdSchemaBase");
auto appliedSchemas = GetAppliedSchemas();
if (appliedSchemas.empty()) {
return false;
}
auto foundMatch = [&appliedSchemas](const std::string& alias) {
return std::find(appliedSchemas.begin(), appliedSchemas.end(), alias)
!= appliedSchemas.end();
};
// See if our schema is directly authored
for (const auto& alias : usdSchemaBase.GetAliases(schemaType)) {
if (foundMatch(alias)) { return true; }
}
// If we couldn't find it directly authored in apiSchemas,
// consider derived types. For example, if a user queries
// prim.HasAPI<UsdModelAPI>() on a prim with
// apiSchemas = ["UsdGeomModelAPI"], we should return true
std::set<TfType> derivedTypes;
schemaType.GetAllDerivedTypes(&derivedTypes);
for (const auto& derived : derivedTypes) {
for (const auto& alias : usdSchemaBase.GetAliases(derived)) {
if (foundMatch(alias)) { return true; }
}
}
return false;
}
UsdMayaAdaptor::SchemaAdaptor
UsdMayaAdaptor::ApplySchemaByName(
const TfToken& schemaName,
MDGModifier& modifier)
{
if (!*this) {
TF_CODING_ERROR("Adaptor is not valid");
return SchemaAdaptor();
}
// Get the schema's TfType; its name should be registered as an alias.
const TfType schemaType =
TfType::Find<UsdSchemaBase>().FindDerivedByName(schemaName);
// Make sure that this is an API schema. Only API schemas can be applied.
if (!schemaType.IsA<UsdAPISchemaBase>()) {
TF_CODING_ERROR("'%s' is not a registered API schema",
schemaName.GetText());
return SchemaAdaptor();
}
// Make sure that this is an "apply" schema.
if (!UsdSchemaRegistry::GetInstance().IsAppliedAPISchema(schemaType)) {
TF_CODING_ERROR("'%s' is not an applied API schema",
schemaName.GetText());
return SchemaAdaptor();
}
// Get the schema definition. If it's registered, there should be a def.
SdfPrimSpecHandle primDef =
UsdSchemaRegistry::GetInstance().GetPrimDefinition(schemaName);
if (!primDef) {
TF_CODING_ERROR("Can't find schema definition for name '%s'",
schemaName.GetText());
return SchemaAdaptor();
}
// Add to schema list (if not yet present).
TfTokenVector currentSchemas = GetAppliedSchemas();
if (std::find(currentSchemas.begin(), currentSchemas.end(), schemaName) ==
currentSchemas.end()) {
currentSchemas.push_back(schemaName);
SetMetadata(
UsdTokens->apiSchemas,
_GetListOpForTokenVector(currentSchemas),
modifier);
}
return SchemaAdaptor(_handle.object(), primDef);
}