/src/alembic/lib/Alembic/Abc/ISchema.h

Source
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#ifndef Alembic_Abc_ISchema_h
#define Alembic_Abc_ISchema_h

#include <Alembic/Abc/Foundation.h>
#include <Alembic/Abc/OSchema.h>
#include <Alembic/Abc/ICompoundProperty.h>

namespace Alembic {
namespace Abc {
namespace ALEMBIC_VERSION_NS {

//-*****************************************************************************
//! See Schema Notes in OSchema.h
//! ...
//-*****************************************************************************

//-*****************************************************************************
//! Usually used as a base class, but could also theoretically be used
//! as a standalone
template <class INFO>
class ISchema : public ICompoundProperty
{
public:
    //-*************************************************************************
    // TYPEDEFS AND IDENTIFIERS
    //-*************************************************************************
    typedef INFO info_type;
    typedef ISchema<INFO> this_type;

    //! Return the schema title expected of this
    //! property. An empty title matches everything
    static const char * getSchemaTitle()
    {
        return INFO::title();
    }

    //! Return the default name for instances of this schema. Often
    //! something like ".geom"
    static const char * getDefaultSchemaName()
    {
        return INFO::defaultName();
    }

    //! This will check whether or not a given entity (as represented by
    //! a metadata) strictly matches the interpretation of this
    //! schema object
    static bool matches( const AbcA::MetaData &iMetaData,
                         SchemaInterpMatching iMatching = kStrictMatching )
    {
        if ( std::string() == getSchemaTitle() || iMatching == kNoMatching )
        { return true; }

        if ( iMatching == kStrictMatching || iMatching == kSchemaTitleMatching )
        {
            return iMetaData.get( "schema" ) == getSchemaTitle();
        }

        return false;
    }

    //! This will check whether or not a given object (as represented by
    //! an object header) strictly matches the interpretation of this
    //! schema object, as well as the data type.
    static bool matches( const AbcA::PropertyHeader &iHeader,
                         SchemaInterpMatching iMatching = kStrictMatching )
    {
        return matches( iHeader.getMetaData(), iMatching );
    }

    //-*************************************************************************
    // CONSTRUCTION, DESTRUCTION, ASSIGNMENT
    //-*************************************************************************

    //! The default constructor creates an empty ISchema
    //! function set.
    ISchema() {}

    //! Creates a new Compound Property Reader with the schema
    //! information added to the metadata.
    //! arguments count include error handling, strictness matching.
    ISchema( const ICompoundProperty &iParent,
             const std::string &iName,
             const Argument &iArg0 = Argument(),
             const Argument &iArg1 = Argument() )
    {
        init( iParent, iName, iArg0, iArg1 );
    }

    //! Wrap an existing compound property, checking that it matches
    //! the schema title info, if strict matching has been selected.
    //! Arguments allow selection of error handling and matching strictness
    ISchema( const ICompoundProperty &iProperty,
             const Argument &iArg0 = Argument(),
             const Argument &iArg1 = Argument() )
    : ICompoundProperty( iProperty.getPtr(),
                         GetErrorHandlerPolicy( iProperty, iArg0, iArg1 ) )
    {
        ALEMBIC_ABC_SAFE_CALL_BEGIN( "ISchema::ISchema( wrap )" );

        const AbcA::PropertyHeader &pheader = this->getHeader();

        ABCA_ASSERT( matches( pheader,
            GetSchemaInterpMatching( iArg0, iArg1 ) ),
            "Incorrect match of schema: "
            << pheader.getMetaData().get( "schema" )
            << " to expected: "
            << INFO::title() );

        // not wrapped, we want to use the default name
        if ( !iProperty.getParent().valid() )
        {
            init( iProperty, getDefaultSchemaName(),
                  iArg0, iArg1 );
        }

        ALEMBIC_ABC_SAFE_CALL_END_RESET();
    }

    // Deprecated in favor of the constructor above
    ISchema( const ICompoundProperty &iProperty,
             WrapExistingFlag iFlag,
             const Argument &iArg0 = Argument(),
             const Argument &iArg1 = Argument() )
    {
      *this = ISchema( iProperty, iArg0, iArg1 );
    }

    //! Default copy constructor used
    //! Default assignment operator used.
    //
    virtual ~ISchema() {}

private:
    void init( const ICompoundProperty & iParentObject,
               const std::string &iName,
               const Argument &iArg0,
               const Argument &iArg1 );
};

//-*****************************************************************************
// TEMPLATE AND INLINE FUNCTIONS
//-*****************************************************************************
template <class INFO>
void ISchema<INFO>::init( const ICompoundProperty & iParent,
                          const std::string &iName,
                          const Argument &iArg0,
                          const Argument &iArg1 )
{
    Arguments args;
    iArg0.setInto( args );
    iArg1.setInto( args );

    getErrorHandler().setPolicy( args.getErrorHandlerPolicy() );

    ALEMBIC_ABC_SAFE_CALL_BEGIN( "ISchema::ISchema::init()" );

    // Get actual reader for parent.
    ABCA_ASSERT( iParent,
                 "NULL parent passed into ISchema ctor" );
    AbcA::CompoundPropertyReaderPtr parent = iParent.getPtr();
    ABCA_ASSERT( parent, "NULL CompoundPropertyReaderPtr" );

    const AbcA::PropertyHeader *pheader = parent->getPropertyHeader( iName );

    ABCA_ASSERT( pheader != NULL,
                 "Nonexistent compound property: " << iName );

    // Check metadata for schema.
    ABCA_ASSERT( matches( *pheader, args.getSchemaInterpMatching() ),

                 "Incorrect match of schema: "
                 << pheader->getMetaData().get( "schema" )
                 << " to expected: "
                 << INFO::title() );

    // Get property.
    m_property = parent->getCompoundProperty( iName );

    ALEMBIC_ABC_SAFE_CALL_END_RESET();
}

} // End namespace ALEMBIC_VERSION_NS

using namespace ALEMBIC_VERSION_NS;

} // End namespace Abc
} // End namespace Alembic

#endif

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Created: 2025-10-10 06:47