d0/d1a/DataReader_8h_source.html

 // -*- c++ -*-


 #ifndef __DATA_READER_H__

 #define __DATA_READER_H__


 // tools

 #include "tools/ToolsConfig.h"

 #include "tools/NoCopy.h"


 // storage

 #include "storage/Index.h"

 #include "storage/RTree.h"

 #include "storage/CtrlInfo.h"

 #include "storage/RawValue.h"


 class DataReader

 {

 public:

     DataReader() {}


     virtual ~DataReader();


     virtual const RawValue::Data *find(const stdString &channel_name,

                                        const epicsTime *start) = 0;


     virtual const stdString &getName() const = 0;


     virtual const RawValue::Data *next() = 0;


     virtual const RawValue::Data *get() const = 0;


     virtual DbrType getType() const = 0;


     virtual DbrCount getCount() const = 0;


     virtual const CtrlInfo &getInfo() const = 0;


     void toString(stdString &text) const;


     virtual bool changedType() = 0;


     virtual bool changedInfo() = 0;

 private:

     PROHIBIT_DEFAULT_COPY(DataReader);

 };


 #endif

DataReader::getName
virtual const stdString & getName() const =0
Name of the channel, i.e. the one passed to find()

DbrType
unsigned short DbrType
DbrType is used to hold dbr_time_xxx types.
Definition: RawValue.h:24

CtrlInfo
Meta-information for values: Units, limits, etc .
Definition: CtrlInfo.h:75

DataReader
Reads data from storage.
Definition: DataReader.h:23

DataReader::getType
virtual DbrType getType() const =0
The dbr_time_xxx type.

DataReader::find
virtual const RawValue::Data * find(const stdString &channel_name, const epicsTime *start)=0
Locate data.

DataReader::toString
void toString(stdString &text) const
Convert current value to string.

DataReader::changedInfo
virtual bool changedInfo()=0
next() updates this if ctrl_info changed.

DbrCount
unsigned short DbrCount
DbrCount is used to hold the array size of CA channels.
Definition: RawValue.h:27

DataReader::changedType
virtual bool changedType()=0
next() updates this if dbr_type/count changed.

DataReader::getCount
virtual DbrCount getCount() const =0
array size

RawValue::Data
dbr_time_double Data
Type for accessing the raw data and its common fields.
Definition: RawValue.h:55

DataReader::getInfo
virtual const CtrlInfo & getInfo() const =0
The meta information for the channel.

DataReader::next
virtual const RawValue::Data * next()=0
Obtain the next value.