PropertyManager.hh

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/*===========================================================================*\
 *                                                                           *
 *   $Revision$                                                              *
 *   $Date$                                                                  *
 *                                                                           *
\*===========================================================================*/

#ifndef PROPERTYMANAGER_HH_
#define PROPERTYMANAGER_HH_

#include <sstream>
#include <stdexcept>
#include <string>

namespace OpenMesh {

template<typename PROPTYPE, typename MeshT>
class PropertyManager {
#if _MSC_VER >= 1900 || __cplusplus > 199711L || defined(__GXX_EXPERIMENTAL_CXX0X__)
    public:
        PropertyManager(const PropertyManager&) = delete;
        PropertyManager& operator=(const PropertyManager&) = delete;
#else
    private:
        PropertyManager(const PropertyManager&);

        PropertyManager& operator=(const PropertyManager&);
#endif

    public:
        PropertyManager(MeshT &mesh, const char *propname, bool existing = false) : mesh_(&mesh), retain_(existing), name_(propname) {
            if (existing) {
                if (!mesh_->get_property_handle(prop_, propname)) {
                    std::ostringstream oss;
                    oss << "Requested property handle \"" << propname << "\" does not exist.";
                    throw std::runtime_error(oss.str());
                }
            } else {
                mesh_->add_property(prop_, propname);
            }
        }

        PropertyManager() : mesh_(0), retain_(false) {
        }

        ~PropertyManager() {
            deleteProperty();
        }

        void swap(PropertyManager &rhs) {
            std::swap(mesh_, rhs.mesh_);
            std::swap(prop_, rhs.prop_);
            std::swap(retain_, rhs.retain_);
            std::swap(name_, rhs.name_);
        }

        static bool propertyExists(MeshT &mesh, const char *propname) {
            PROPTYPE dummy;
            return mesh.get_property_handle(dummy, propname);
        }

        bool isValid() const { return mesh_ != 0; }
        operator bool() const { return isValid(); }

        const PROPTYPE &getRawProperty() const { return prop_; }

        const std::string &getName() const { return name_; }

        MeshT &getMesh() const { return *mesh_; }

#if _MSC_VER >= 1900 || __cplusplus > 199711L || defined(__GXX_EXPERIMENTAL_CXX0X__)

        typedef PropertyManager<PROPTYPE, MeshT> Proxy;

        PropertyManager(PropertyManager &&rhs) : mesh_(rhs.mesh_), prop_(rhs.prop_), retain_(rhs.retain_), name_(rhs.name_) {
            rhs.retain_ = true;
        }

        PropertyManager &operator=(PropertyManager &&rhs) {
            if (&rhs != this) {
                deleteProperty();
                mesh_ = rhs.mesh_;
                prop_ = rhs.prop_;
                retain_ = rhs.retain_;
                name_ = rhs.name_;
                rhs.retain_ = true;
            }
            return *this;
        }

        static PropertyManager createIfNotExists(MeshT &mesh, const char *propname) {
            PROPTYPE dummy_prop;
            PropertyManager pm(mesh, propname, mesh.get_property_handle(dummy_prop, propname));
            pm.retain();
            return std::move(pm);
        }


        PropertyManager duplicate(const char *clone_name) {
            PropertyManager pm(*mesh_, clone_name, false);
            pm.mesh_->property(pm.prop_) = mesh_->property(prop_);
            return pm;
        }

        PropertyManager move() {
            return std::move(*this);
        }

#else
        class Proxy {
            private:
                Proxy(MeshT *mesh_, PROPTYPE prop_, bool retain_, const std::string &name_) :
                    mesh_(mesh_), prop_(prop_), retain_(retain_), name_(name_) {}
                MeshT *mesh_;
                PROPTYPE prop_;
                bool retain_;
                std::string name_;

                friend class PropertyManager;
        };

        operator Proxy() {
            Proxy p(mesh_, prop_, retain_, name_);
            mesh_ = 0;
            retain_ = true;
            return p;
        }

        Proxy move() {
            return (Proxy)*this;
        }

        PropertyManager(Proxy p) : mesh_(p.mesh_), prop_(p.prop_), retain_(p.retain_), name_(p.name_) {}

        PropertyManager &operator=(Proxy p) {
            PropertyManager(p).swap(*this);
            return *this;
        }

        static Proxy createIfNotExists(MeshT &mesh, const char *propname) {
            PROPTYPE dummy_prop;
            PropertyManager pm(mesh, propname, mesh.get_property_handle(dummy_prop, propname));
            pm.retain();
            return (Proxy)pm;
        }

        Proxy duplicate(const char *clone_name) {
            PropertyManager pm(*mesh_, clone_name, false);
            pm.mesh_->property(pm.prop_) = mesh_->property(prop_);
            return (Proxy)pm;
        }
#endif

        inline void retain(bool doRetain = true) {
            retain_ = doRetain;
        }

        inline PROPTYPE &operator* () {
            return prop_;
        }

        inline const PROPTYPE &operator* () const {
            return prop_;
        }

        template<typename HandleType>
        inline typename PROPTYPE::reference operator[] (const HandleType &handle) {
            return mesh_->property(prop_, handle);
        }

        template<typename HandleType>
        inline typename PROPTYPE::const_reference operator[] (const HandleType &handle) const {
            return mesh_->property(prop_, handle);
        }

        template<typename HandleTypeIterator, typename PROP_VALUE>
        void set_range(HandleTypeIterator begin, HandleTypeIterator end,
                const PROP_VALUE &value) {
            for (; begin != end; ++begin)
                (*this)[*begin] = value;
        }

        template<typename HandleTypeIterator, typename PROPTYPE_2,
                 typename MeshT_2, typename HandleTypeIterator_2>
        void copy_to(HandleTypeIterator begin, HandleTypeIterator end,
                PropertyManager<PROPTYPE_2, MeshT_2> &dst_propmanager,
                HandleTypeIterator_2 dst_begin, HandleTypeIterator_2 dst_end) const {

            for (; begin != end && dst_begin != dst_end; ++begin, ++dst_begin) {
                dst_propmanager[*dst_begin] = (*this)[*begin];
            }
        }

        template<typename RangeType, typename PROPTYPE_2,
                 typename MeshT_2, typename RangeType_2>
        void copy_to(const RangeType &range,
                PropertyManager<PROPTYPE_2, MeshT_2> &dst_propmanager,
                const RangeType_2 &dst_range) const {
            copy_to(range.begin(), range.end(), dst_propmanager,
                    dst_range.begin(), dst_range.end());
        }

        template<typename RangeType, typename MeshT_2, typename RangeType_2>
        static void copy(const char *prop_name,
                MeshT &src_mesh, const RangeType &src_range,
                MeshT_2 &dst_mesh, const RangeType_2 &dst_range) {

            typedef OpenMesh::PropertyManager<PROPTYPE, MeshT> DstPM;
            DstPM dst(DstPM::createIfNotExists(dst_mesh, prop_name));

            typedef OpenMesh::PropertyManager<PROPTYPE, MeshT_2> SrcPM;
            SrcPM src(src_mesh, prop_name, true);

            src.copy_to(src_range, dst, dst_range);
        }

    private:
        void deleteProperty() {
            if (!retain_)
                mesh_->remove_property(prop_);
        }

    private:
        MeshT *mesh_;
        PROPTYPE prop_;
        bool retain_;
        std::string name_;
};

template<typename PROPTYPE, typename MeshT>
PropertyManager<PROPTYPE, MeshT> makePropertyManagerFromNew(MeshT &mesh, const char *propname) {
    return PropertyManager<PROPTYPE, MeshT>(mesh, propname, false);
}

template<typename PROPTYPE, typename MeshT>
PropertyManager<PROPTYPE, MeshT> makePropertyManagerFromExisting(MeshT &mesh, const char *propname) {
    return PropertyManager<PROPTYPE, MeshT>(mesh, propname, true);
}

template<typename PROPTYPE, typename MeshT>
PropertyManager<PROPTYPE, MeshT> makePropertyManagerFromExistingOrNew(MeshT &mesh, const char *propname) {
    return PropertyManager<PROPTYPE, MeshT>::createIfNotExists(mesh, propname);
}

} /* namespace OpenMesh */
#endif /* PROPERTYMANAGER_HH_ */