dataSourceAttributeTypeName.h

//
// Copyright 2023 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_USD_IMAGING_USD_IMAGING_DATA_SOURCE_ATTRIBUTE_TYPENAME_H
#define PXR_USD_IMAGING_USD_IMAGING_DATA_SOURCE_ATTRIBUTE_TYPENAME_H
 
#include "pxr/usd/usd/attribute.h"
#include "pxr/usdImaging/usdImaging/api.h"
#include "pxr/imaging/hd/dataSource.h"
#include "pxr/imaging/hd/dataSourceTypeDefs.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
class UsdImagingDataSourceAttributeTypeName : public HdTokenDataSource
{
public:
 
    HD_DECLARE_DATASOURCE(UsdImagingDataSourceAttributeTypeName);
 
    VtValue GetValue(HdSampledDataSource::Time shutterOffset) override
    {
        return VtValue(GetTypedValue(shutterOffset));
    }
 
    TfToken GetTypedValue(HdSampledDataSource::Time shutterOffset) override
    {
        if (!_usdAttr) {
            return {};
        }
        TF_UNUSED(shutterOffset);
        // We are using the GetAsToken() here since we do not expect an alias 
        // other than the "official" type name.
        return _usdAttr.GetTypeName().GetAsToken();
    }
 
    bool GetContributingSampleTimesForInterval(
        HdSampledDataSource::Time startTime,
        HdSampledDataSource::Time endTime,
        std::vector<HdSampledDataSource::Time> *outSampleTimes) override
    {
        TF_UNUSED(startTime);
        TF_UNUSED(endTime);
        return false;
    }
 
private:
 
    UsdImagingDataSourceAttributeTypeName(const UsdAttribute &usdAttr);
 
private:
    UsdAttribute _usdAttr;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_USD_IMAGING_USD_IMAGING_DATA_SOURCE_ATTRIBUTE_TYPENAME_H