ntnameValue.h

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/* ntnameValue.h */
/*
 * Copyright information and license terms for this software can be
 * found in the file LICENSE that is included with the distribution
 */
#ifndef NTNAMEVALUE_H
#define NTNAMEVALUE_H
 
#ifdef epicsExportSharedSymbols
#   define ntnameValueEpicsExportSharedSymbols
#   undef epicsExportSharedSymbols
#endif
 
#include <pv/pvDisplay.h>
#include <pv/pvControl.h>
 
#ifdef ntnameValueEpicsExportSharedSymbols
#   define epicsExportSharedSymbols
#   undef ntnameValueEpicsExportSharedSymbols
#endif
 
#include <pv/ntfield.h>
 
#include <shareLib.h>
 
namespace epics { namespace nt {
 
class NTNameValue;
typedef std::tr1::shared_ptr<NTNameValue> NTNameValuePtr;
 
namespace detail {
 
    class epicsShareClass NTNameValueBuilder :
        public std::tr1::enable_shared_from_this<NTNameValueBuilder>
    {
    public:
        POINTER_DEFINITIONS(NTNameValueBuilder);
 
        shared_pointer value(epics::pvData::ScalarType scalarType);
 
        shared_pointer addDescriptor();
 
        shared_pointer addAlarm();
 
        shared_pointer addTimeStamp();
 
        epics::pvData::StructureConstPtr createStructure();
 
        epics::pvData::PVStructurePtr createPVStructure();
 
        NTNameValuePtr create();
 
        shared_pointer add(std::string const & name, epics::pvData::FieldConstPtr const & field);
 
    private:
        NTNameValueBuilder();
 
        void reset();
 
        bool valueTypeSet;
        epics::pvData::ScalarType valueType;
 
        bool descriptor;
        bool alarm;
        bool timeStamp;
 
        // NOTE: this preserves order, however it does not handle duplicates
        epics::pvData::StringArray extraFieldNames;
        epics::pvData::FieldConstPtrArray extraFields;
 
        friend class ::epics::nt::NTNameValue;
    };
 
}
 
typedef std::tr1::shared_ptr<detail::NTNameValueBuilder> NTNameValueBuilderPtr;
 
class epicsShareClass NTNameValue
{
public:
    POINTER_DEFINITIONS(NTNameValue);
 
    static const std::string URI;
 
    static shared_pointer wrap(epics::pvData::PVStructurePtr const & pvStructure);
 
    static shared_pointer wrapUnsafe(epics::pvData::PVStructurePtr const & pvStructure);
 
    static bool is_a(epics::pvData::StructureConstPtr const & structure);
 
    static bool is_a(epics::pvData::PVStructurePtr const & pvStructure);
 
    static bool isCompatible(
        epics::pvData::StructureConstPtr const &structure);
 
    static bool isCompatible(
        epics::pvData::PVStructurePtr const &pvStructure);
 
    bool isValid();
 
    static NTNameValueBuilderPtr createBuilder();
 
    ~NTNameValue() {}
 
    bool attachTimeStamp(epics::pvData::PVTimeStamp &pvTimeStamp) const;
 
    bool attachAlarm(epics::pvData::PVAlarm &pvAlarm) const;
 
    epics::pvData::PVStructurePtr getPVStructure() const;
 
    epics::pvData::PVStringPtr getDescriptor() const;
 
    epics::pvData::PVStructurePtr getTimeStamp() const;
 
    epics::pvData::PVStructurePtr getAlarm() const;
 
    epics::pvData::PVStringArrayPtr getName() const;
 
    epics::pvData::PVFieldPtr getValue() const;
 
    template<typename PVT>
    std::tr1::shared_ptr<PVT> getValue() const
    {
        epics::pvData::PVFieldPtr pvField = getValue();
        if (pvField.get())
            return std::tr1::dynamic_pointer_cast<PVT>(pvField);
        else
            return std::tr1::shared_ptr<PVT>();
    }
 
private:
    NTNameValue(epics::pvData::PVStructurePtr const & pvStructure);
    epics::pvData::PVStructurePtr pvNTNameValue;
    friend class detail::NTNameValueBuilder;
};
 
}}
#endif  /* NTNAMEVALUE_H */