systemSchema.h

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//
// Copyright 2023 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
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//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
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//
//     http://www.apache.org/licenses/LICENSE-2.0
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/* ************************************************************************** */
/* ** This file is generated by a script.  Do not edit directly.  Edit     ** */
/* ** defs.py or the (*)Schema.template.h files to make changes.           ** */
/* ************************************************************************** */

#ifndef PXR_IMAGING_HDAR_SYSTEM_SCHEMA_H
#define PXR_IMAGING_HDAR_SYSTEM_SCHEMA_H

#include "pxr/imaging/hdar/api.h"

#include "pxr/imaging/hd/schema.h" 

#include "pxr/base/tf/declarePtrs.h"

PXR_NAMESPACE_OPEN_SCOPE

//-----------------------------------------------------------------------------

#define HDARSYSTEM_SCHEMA_TOKENS \
    (assetResolution) \
    (resolverContext) \

TF_DECLARE_PUBLIC_TOKENS(HdarSystemSchemaTokens, HDAR_API,
    HDARSYSTEM_SCHEMA_TOKENS);

//-----------------------------------------------------------------------------

TF_DECLARE_REF_PTRS(HdSceneIndexBase);

/// The HdarSystemSchema specifies a container that will hold "system"
/// data that is relevant to asset resolution.
class HdarSystemSchema : public HdSchema
{
public:
    HdarSystemSchema(HdContainerDataSourceHandle container)
    : HdSchema(container) {}

    //ACCESSORS

    HDAR_API
    HdResolverContextDataSourceHandle GetResolverContext();

    // RETRIEVING AND CONSTRUCTING

    /// Builds a container data source which includes the provided child data
    /// sources. Parameters with nullptr values are excluded. This is a
    /// low-level interface. For cases in which it's desired to define
    /// the container with a sparse set of child fields, the Builder class
    /// is often more convenient and readable.
    HDAR_API
    static HdContainerDataSourceHandle
    BuildRetained(
        const HdResolverContextDataSourceHandle &resolverContext
    );

    /// \class HdarSystemSchema::Builder
    /// 
    /// Utility class for setting sparse sets of child data source fields to be
    /// filled as arguments into BuildRetained. Because all setter methods
    /// return a reference to the instance, this can be used in the "builder
    /// pattern" form.
    class Builder
    {
    public:
        HDAR_API
        Builder &SetResolverContext(
            const HdResolverContextDataSourceHandle &resolverContext);

        /// Returns a container data source containing the members set thus far.
        HDAR_API
        HdContainerDataSourceHandle Build();

    private:
        HdResolverContextDataSourceHandle _resolverContext;
    };

    /// Evaluates the asset resolution "system" data source for \p fromPath.
    ///
    /// If found, the return value will be non-null and \p foundAtPath
    /// will contain the path at which the non-null result was found.
    /// Otherwise, this returns null.
    ///
    /// This operation will be linear in the length of \p fromPath.
    HD_API
    static HdContainerDataSourceHandle GetFromPath(
            HdSceneIndexBaseRefPtr const &inputScene,
            SdfPath const &fromPath,
            SdfPath *foundAtPath);

    /// Retrieves a container data source with the schema's default name token
    /// "assetResolution" from the parent container and constructs a
    /// HdarSystemSchema instance.
    /// Because the requested container data source may not exist, the result
    /// should be checked with IsDefined() or a bool comparison before use.
    HDAR_API
    static HdarSystemSchema GetFromParent(
        const HdContainerDataSourceHandle &fromParentContainer);

    /// Returns a token where the container representing this schema is found in
    /// a container by default.
    HDAR_API
    static const TfToken &GetSchemaToken();

    /// Returns an HdDataSourceLocator (relative to the prim-level data source)
    /// where the container representing this schema is found by default.
    HDAR_API
    static const HdDataSourceLocator &GetDefaultLocator();

};

PXR_NAMESPACE_CLOSE_SCOPE

#endif