HUSD_EditLinkCollections.h

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/*
* Copyright 2019 Side Effects Software Inc.
 *
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*
*/

#ifndef __HUSD_EditLinkCollections_h__
#define __HUSD_EditLinkCollections_h__

#include "HUSD_API.h"
#include "HUSD_DataHandle.h"
#include <UT/UT_String.h>
#include <UT/UT_UniquePtr.h>

class husd_EditLinkCollectionsPrivate;
class HUSD_FindPrims;
class HUSD_TimeCode;

// This class allows edit of links between prims that are defined as
// collections, typically with a specific name for the collection that defines
// the link.
// These are things like light links and shadow links with are collections on
// a prim (in their case a prim with the UsdLuxLightAPI schema) that specifies
// the geometry prims they are linked to.
class HUSD_API HUSD_EditLinkCollections
{
public:
    enum LinkType
    {
        LightLink,
        ShadowLink,
        MaterialLink
    };

    HUSD_EditLinkCollections(HUSD_AutoWriteLock &lock, LinkType linktype);
    ~HUSD_EditLinkCollections();


    /// Add a link whose source is the prim that will contain the collection
    /// that defines the link.
    /// This does not create the collections.
    bool                 addLinkItems(const HUSD_FindPrims &linkSource,
                                const HUSD_FindPrims &includeprims,
                                const HUSD_FindPrims &excludeprims,
                                const UT_StringHolder &pathexpr,
                                const UT_StringRef &linkid);

    /// Add a link whose source is NOT the prim that will contain the
    /// collection that defines the link, but rather the prims in the link's
    /// include and excludes lists will contain the collection that defines
    /// the link.
    /// This does not create the collections.
    bool                 addReverseLinkItems(const HUSD_FindPrims &linkSource,
                                const HUSD_FindPrims &includeprims,
                                const HUSD_FindPrims &excludeprims,
                                const UT_StringHolder &pathexpr,
                                const UT_StringRef &linkid);

    /// Create the collections necessary for all links previously added.
    bool                 createCollections(UT_String *error_message=nullptr);

private:
    HUSD_AutoWriteLock                              &myWriteLock;
    LinkType                                         myLinkType;
    UT_UniquePtr<husd_EditLinkCollectionsPrivate>    myPrivate;
};

#endif