datalessExecutor.h

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//
// Copyright 2025 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_EXEC_VDF_DATALESS_EXECUTOR_H
#define PXR_EXEC_VDF_DATALESS_EXECUTOR_H


#include "pxr/pxr.h"

#include "pxr/exec/vdf/api.h"
#include "pxr/exec/vdf/executorInterface.h"

PXR_NAMESPACE_OPEN_SCOPE

class VdfOutput;
class VdfVector;


class VDF_API_TYPE VdfDatalessExecutor : public VdfExecutorInterface
{
public:

    VDF_API
    virtual ~VdfDatalessExecutor();

    VDF_API
    virtual void SetOutputValue(
        const VdfOutput &output,
        const VdfVector &value,
        const VdfMask &mask) override;

    VDF_API
    virtual bool TakeOutputValue(
        const VdfOutput &output,
        VdfVector *value,
        const VdfMask &mask) override;

    virtual bool IsEmpty() const override {
        return true;
    }

protected:

    VDF_API
    VdfDatalessExecutor();

    virtual const VdfVector *_GetInputValue(
        const VdfConnection &connection,
        const VdfMask &mask) const override {
        return NULL;
    }

    virtual const VdfVector *_GetOutputValueForReading(
        const VdfOutput &output,
        const VdfMask &mask) const override {
        return NULL;
    }

    virtual VdfVector *_GetOutputValueForWriting(
        const VdfOutput &output) const override {
        return NULL;
    }

    virtual void _UpdateInvalidationTimestamp() override {}

    VDF_API
    virtual void _SetReferenceOutputValue(
        const VdfOutput &destOutput,
        const VdfOutput &sourceOutput,
        const VdfMask &sourceMask) const override;

    virtual void _TouchOutput(const VdfOutput &output) const override {}

};

PXR_NAMESPACE_CLOSE_SCOPE

#endif