IBaseProperty.h

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//-*****************************************************************************
//
// Copyright (c) 2009-2011,
//  Sony Pictures Imageworks, Inc. and
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//-*****************************************************************************

#ifndef Alembic_Abc_IBaseProperty_h
#define Alembic_Abc_IBaseProperty_h

#include <Alembic/Abc/Foundation.h>
#include <Alembic/Abc/Base.h>
#include <Alembic/Abc/Argument.h>
#include <Alembic/Abc/IObject.h>
#include <Alembic/Abc/IArchive.h>

namespace Alembic {
namespace Abc {
namespace ALEMBIC_VERSION_NS {

//-*****************************************************************************
//! Most of the functionality of properties (getting information about the
//! properties and so on) is common to all property types, so we create
//! a base class to contain all that functionality.
//! This is purely a base class for other properties to derive from,
//! it will never be created directly.
template <class PROP_PTR>
class IBasePropertyT : public Base
{
protected:
    //-*************************************************************************
    // TYPEDEFS AND IDENTIFIERS
    //-*************************************************************************
    typedef IBasePropertyT<PROP_PTR> this_type;
    typedef IBasePropertyT<PROP_PTR> operator_bool_base_type;

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

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

    //! This attaches an IBasePropertyT wrapper around an existing
    //! PROP_PTR, with an optional error handling policy.
    IBasePropertyT(

        //! The pointer
        //! ...
        PROP_PTR iPtr,

        //! Optional error handling policy
        //! ...
        ErrorHandler::Policy iPolicy );

    //! Default copy constructor used
    //! Default assignment operator used.

public:
    //-*************************************************************************
    // PROPERTY WRITER FUNCTIONALITY
    //-*************************************************************************

    //! Return the property's header.
    //! ...
    const AbcA::PropertyHeader & getHeader() const;

    //! This function returns the property's local name
    //! ...
    const std::string &getName() const
    { return getHeader().getName(); }

    //! This function returns the property's type
    //! ...
    AbcA::PropertyType getPropertyType() const
    { return getHeader().getPropertyType(); }

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

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

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

    //! Non-compound properties have a TimeSamplingPtr. 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
    //! TimeSamplingPtr from the header that was used in creation.
    AbcA::TimeSamplingPtr getTimeSampling() const
    { return getHeader().getTimeSampling(); }

    //! This function returns the property's object, handily
    //! wrapped in an IObject wrapper.
    IObject getObject() const;

    //-*************************************************************************
    // ABC BASE MECHANISMS
    // These functions are used by Abc to deal with errors, rewrapping,
    // and so on.
    //-*************************************************************************

    //! getPtr, as usual, returns a shared ptr to the
    //! underlying AbcCoreAbstract object, in this case the
    //! PROP_PTR.
    PROP_PTR getPtr() const { return m_property; }

    //! Reset returns this function set to an empty, default
    //! state.
    void reset() { m_property.reset(); Base::reset(); }

    //! Valid returns whether this function set is
    //! valid.
    bool valid() const
    {
        return ( Base::valid() && m_property );
    }

    //! The unspecified-bool-type operator casts the object to "true"
    //! if it is valid, and "false" otherwise.
    ALEMBIC_OPERATOR_BOOL( valid() );

protected:
    PROP_PTR m_property;
};

//-*****************************************************************************
// TEMPLATE AND INLINE FUNCTIONS
//-*****************************************************************************
template <class PROP_PTR>
inline IBasePropertyT<PROP_PTR>::IBasePropertyT
(
    PROP_PTR iPtr,
    ErrorHandler::Policy iPolicy )
  : m_property( iPtr )
{
    getErrorHandler().setPolicy( iPolicy );
}

//-*****************************************************************************
template <class PROP_PTR>
const AbcA::PropertyHeader &IBasePropertyT<PROP_PTR>::getHeader() const
{
    ALEMBIC_ABC_SAFE_CALL_BEGIN( "IBasePropertyT::getHeader()" );

    return m_property->getHeader();

    ALEMBIC_ABC_SAFE_CALL_END();

    // Not all error handlers throw, so have a default behavior.
    static const AbcA::PropertyHeader phd;
    return phd;
};

//-*****************************************************************************
template <class PROP_PTR>
IObject IBasePropertyT<PROP_PTR>::getObject() const
{
    ALEMBIC_ABC_SAFE_CALL_BEGIN( "IBasePropertyT::getObject()" );

    return IObject( m_property->getObject(),
                    kWrapExisting,
                    getErrorHandlerPolicy() );

    ALEMBIC_ABC_SAFE_CALL_END();

    // Not all error handlers throw. Have a default.
    return IObject();
}

} // End namespace ALEMBIC_VERSION_NS

using namespace ALEMBIC_VERSION_NS;

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

#endif