BasePropertyWriter.h

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#ifndef Alembic_AbcCoreAbstract_BasePropertyWriter_h
#define Alembic_AbcCoreAbstract_BasePropertyWriter_h

#include <Alembic/Util/Export.h>
#include <Alembic/AbcCoreAbstract/Foundation.h>
#include <Alembic/AbcCoreAbstract/ForwardDeclarations.h>
#include <Alembic/AbcCoreAbstract/PropertyHeader.h>

namespace Alembic {
namespace AbcCoreAbstract {
namespace ALEMBIC_VERSION_NS {

//-*****************************************************************************
//! The BasePropertyWriter is the base class for all properties,
//! from Simple (which encompasses Scalar and Array properties) to
//! Compound. The functions here establish the things which all properties
//! have in common - name, metaData, propertyType, as well as
//! upcasting capabilities. We don't want to rely on dynamic_cast - it's
//! slow and potentially has problems across DSO interfaces.
class ALEMBIC_EXPORT BasePropertyWriter
    : private Alembic::Util::noncopyable
{
public:
    //! Virtual destructor
    //! ...
    virtual ~BasePropertyWriter();
    
    //-*************************************************************************
    // NEW FUNCTIONS
    //-*************************************************************************

    //! Properties are created with a collection of metadata that is stored
    //! in a lightweight structure called PropertyHeader.
    //! This returns a constant reference to the PropertyHeader which
    //! was given upon creation.
    virtual const PropertyHeader & getHeader() const = 0;

    //! All properties have a name, which is unique amongst its siblings
    //! in the compund property they all live in. This is the name that
    //! was given when the property was created, and is part of the property
    //! header.
    const std::string &getName() const
    { return getHeader().getName(); }

    //! There are three types of abstract properties.
    //! They are Scalar, Array, and Compound properties. This function
    //! returns an enum PropertyType which indicates which property
    //! type is returned. This is simply a convenience function which
    //! returns data from the PropertyHeader.
    PropertyType getPropertyType() const
    { return getHeader().getPropertyType(); }

    //! Convenience to return whether the property is scalar.
    //! Same as getPropertyType() == kScalarProperty
    bool isScalar() const { return getPropertyType() == kScalarProperty; }

    //! Convenience to return whether the property is array.
    //! Same as getPropertyType() == kArrayProperty
    bool isArray() const { return getPropertyType() == kArrayProperty; }

    //! Convenience to return whether the property is compound.
    //! Same as getPropertyType() == kCompoundProperty
    bool isCompound() const { return getPropertyType() == kCompoundProperty; }

    //! Convenience to return whether the property is simple (non-compound)
    //! Same as getPropertyType() != kCompoundProperty
    bool isSimple() const { return !isCompound(); }

    //! All properties have MetaData. This just returns the
    //! MetaData portion of the header that was used in creation.
    const MetaData &getMetaData() const
    { return getHeader().getMetaData(); }

    //! Non-compound properties have a DataType. It is an error
    //! to call this function for CompoundProperties, and an exception will
    //! be thrown. This is a convenience function which just returns the
    //! DataType from the header that was used in creation.
    const DataType &getDataType() const
    { return getHeader().getDataType(); }

    //! Non-compound properties have a TimeSampling. It is an error
    //! to call this function for CompoundProperties, and an exception will
    //! be thrown. This is a convenience function which just returns the
    //! TimeSamplingType from the header that was used in creation.
    TimeSamplingPtr getTimeSampling() const
    { return getHeader().getTimeSampling(); }
    
    //! All properties have an object that owns them, and in order to
    //! ensure the object stays alive as long as the properties do, they
    //! retain a shared pointer to their object.
    virtual ObjectWriterPtr getObject() = 0;

    //! Most properties live in a compound property. (Except for
    //! the top-compound property in any object)
    //! This returns a pointer to the parent compound property.
    virtual CompoundPropertyWriterPtr getParent() = 0;    

    //! Up-cast this base property to a ScalarProperty, if such an
    //! upcast is valid. This can be checked with the \ref isScalar()
    //! function. If the upcast is not valid, an empty pointer will
    //! be returned. This default implementation returns an empty
    //! pointer.
    virtual ScalarPropertyWriterPtr asScalarPtr();
    
    //! Up-cast this base property to an ArrayProperty, if such an
    //! upcast is valid. This can be checked with the \ref isArray()
    //! function. If the upcast is not valid, an empty pointer will
    //! be returned. This default implementation returns an empty
    //! pointer.
    virtual ArrayPropertyWriterPtr asArrayPtr();
    
    //! Up-cast this base property to a CompoundProperty, if such an
    //! upcast is valid. This can be checked with the \ref isCompound()
    //! function. If the upcast is not valid, an empty pointer will
    //! be returned. This default implementation returns an empty
    //! pointer.
    virtual CompoundPropertyWriterPtr asCompoundPtr();
};

} // End namespace ALEMBIC_VERSION_NS

using namespace ALEMBIC_VERSION_NS;

} // End namespace AbcCoreAbstract
} // End namespace Alembic

#endif