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casacore::RecordRep Class Reference

The representation of a Record. More...

#include <RecordRep.h>

Inheritance diagram for casacore::RecordRep:
casacore::TableRecordRep

Public Member Functions

 RecordRep ()
 Create a record with no fields. More...
 
 RecordRep (const RecordDesc &description)
 Create a record with the given description. More...
 
 RecordRep (const RecordRep &other)
 Create a copy of other using copy semantics. More...
 
RecordRepoperator= (const RecordRep &other)
 Copy all the data over. More...
 
virtual ~RecordRep ()
 Delete all data. More...
 
const Stringcomment (Int whichField) const
 Get the comment for this field. More...
 
void setComment (Int whichField, const String &comment)
 Set the comment for this field. More...
 
const RecordDescdescription () const
 Describes the current structure of this Record. More...
 
void restructure (const RecordDesc &newDescription, Bool recursive)
 Change the structure of this Record to contain the fields in newDescription. More...
 
Bool conform (const RecordRep &other) const
 Returns True if this and other have the same RecordDesc, other than different names for the fields. More...
 
void copyData (const RecordRep &other)
 Copy all data of the Record. More...
 
void copyDataField (DataType type, Int whichField, const void *that) const
 Copy a data field. More...
 
void removeField (Int whichField)
 Remove a field from the record. More...
 
void renameField (const String &newName, Int whichField)
 Rename the given field. More...
 
void addDataField (const String &name, DataType type, const IPosition &shape, Bool fixedShape, const void *data)
 Add a field with the given name and value to the record. More...
 
void addField (const String &name, const Record &value, RecordInterface::RecordType type)
 
void defineDataField (Int whichField, DataType type, const void *value)
 Define a value for the given field. More...
 
void putRecord (AipsIO &os, int recordType) const
 Put the description and data of the Record. More...
 
void getRecord (AipsIO &os, Int &recordType)
 Get the description and data of the Record. More...
 
void putData (AipsIO &os) const
 Put the data of a record. More...
 
void getData (AipsIO &os, uInt version)
 Read the data of a record. More...
 
void * get_pointer (Int whichField, DataType type) const
 Used by the RecordFieldPtr classes to attach in a type-safe way to the correct field. More...
 
void * get_pointer (Int whichField, DataType type, const String &recordType) const
 
void mergeField (const RecordRep &other, Int whichFieldFromOther, RecordInterface::DuplicatesFlag)
 Merge a field from another record into this record. More...
 
void merge (const RecordRep &other, RecordInterface::DuplicatesFlag)
 Merge all fields from the other record into this record. More...
 
void print (std::ostream &, Int maxNrValues=25, const String &indent="") const
 Print a record. More...
 

Protected Member Functions

void delete_myself (uInt nfields)
 Utility functions to avoid code duplication in the public member functions. More...
 
void copy_other (const RecordRep &other)
 
virtual Int fieldNumber (const String &name) const
 Get the field number for a given name. More...
 
void addDataPtr (void *ptr)
 Add the data pointer to the data block. More...
 
void removeDataPtr (Int index)
 Remove a data pointer add the given index. More...
 
void checkShape (DataType type, const IPosition &shape, const void *value, const String &fieldName)
 Check if the shape of the data array matches the shape of a fixed-shaped array in the description. More...
 
virtual void addFieldToDesc (const String &name, DataType type, const IPosition &shape, Bool fixedShape)
 Add a field to the description. More...
 
virtual void removeData (Int whichField, void *ptr, void *vecptr)
 Remove a data field. More...
 
virtual void removeFieldFromDesc (Int whichField)
 Remove a field from the description. More...
 
void * createDataField (DataType type, const IPosition &shape)
 Create a data field for the given type and shape. More...
 
void deleteDataField (DataType type, void *ptr, void *vecptr)
 Delete a data field. More...
 
void copyDataField (DataType type, void *ptr, const void *that) const
 Copy a data field. More...
 
void printDataField (std::ostream &os, DataType type, const String &indent, Int maxNrValues, const void *ptr) const
 Print a data field. More...
 
void putDataField (AipsIO &os, DataType type, const void *ptr) const
 Put a data field. More...
 
void getDataField (AipsIO &os, DataType type, void *ptr)
 Get a data field. More...
 
void makeDataVec (Int whichField, DataType type)
 Make an array for a scalar data field. More...
 
void getKeySet (AipsIO &os, uInt version, uInt type)
 Get a Scalar/ArrayKeywordSet object as a Record. More...
 
void getKeyDesc (AipsIO &os, RecordDesc &desc)
 Get the description of a keyword set as a RecordDesc. More...
 
void getScalarKeys (AipsIO &os)
 Get the scalar values of a keyword set. More...
 
void getArrayKeys (AipsIO &os)
 Get the array values of a keyword set. More...
 

Protected Attributes

RecordDesc desc_p
 Holds the structure of this Record. More...
 
Block< void * > data_p
 Pointers to data values. More...
 
Block< void * > datavec_p
 Pointers to a vector of a scalar (to access a scalar as an array). More...
 
uInt nused_p
 #Entries used in data_p. More...
 

Detailed Description

The representation of a Record.

Intended use:

Internal

Review Status

Reviewed By:
Mark Wieringa
Date Reviewed:
1996/04/15
Test programs:
tRecord

Prerequisite

Etymology

RecordRep is the REPresentation of a Record.

Synopsis

RecordRep is the actual implementation of a Record object. It contains the description and the data. The data is stored as a collection of void* pointers to the actual data. By storing it in this indirect way, it is easier to extend the data block. It also means that RecordFieldPtr objects always have the correct pointer and do not need to be adjusted when the data block is extended.

Despite the fact that the data pointers have type void*, the functions are completely type safe. This is done by passing the type around using the DataType enumeration. The downpart is that only types from that enumeration are supported (but that is also required by the RecordDesc mechanics).

Note that RecordRep does not know anything about RecordFieldPtr objects pointing to its data. Only its mother class Record knows about them and handles all cases where the RecordFieldPtr's have to be notified.

Example

RecordRep mirrors all functions in Record.

Motivation

Having a separate RecordRep class makes copy-on-write possible. It also allows derivation of other RecordRep classes (like TableRecordRep), while their mother classes are not derived from each other.

To Do

Definition at line 100 of file RecordRep.h.

Constructor & Destructor Documentation

casacore::RecordRep::RecordRep ( )

Create a record with no fields.

casacore::RecordRep::RecordRep ( const RecordDesc description)

Create a record with the given description.

If it is not possible to create all fields (for example, if a field of an unsupported type is requested), an exception is thrown. All fields are checked by the field checking function (if defined).

casacore::RecordRep::RecordRep ( const RecordRep other)

Create a copy of other using copy semantics.

virtual casacore::RecordRep::~RecordRep ( )
virtual

Delete all data.

Member Function Documentation

void casacore::RecordRep::addDataField ( const String name,
DataType  type,
const IPosition shape,
Bool  fixedShape,
const void *  data 
)

Add a field with the given name and value to the record.

The data type of the field is determined by the data type of the value. For arrays it is possible to define if the shape is fixed.

void casacore::RecordRep::addDataPtr ( void *  ptr)
protected

Add the data pointer to the data block.

The block is extended when needed.

void casacore::RecordRep::addField ( const String name,
const Record value,
RecordInterface::RecordType  type 
)
virtual void casacore::RecordRep::addFieldToDesc ( const String name,
DataType  type,
const IPosition shape,
Bool  fixedShape 
)
protectedvirtual

Add a field to the description.

Reimplemented in casacore::TableRecordRep.

void casacore::RecordRep::checkShape ( DataType  type,
const IPosition shape,
const void *  value,
const String fieldName 
)
protected

Check if the shape of the data array matches the shape of a fixed-shaped array in the description.

const String & casacore::RecordRep::comment ( Int  whichField) const
inline

Get the comment for this field.

Definition at line 313 of file RecordRep.h.

References casacore::RecordDesc::comment(), and desc_p.

Bool casacore::RecordRep::conform ( const RecordRep other) const

Returns True if this and other have the same RecordDesc, other than different names for the fields.

That is, the number, type and the order of the fields must be identical (recursively for fixed structured sub-Records in this).
Caution: thisRecord;conform(thatRecord) == True does not imply
thatRecord;conform(thisRecord) == True, because a variable record in one conforms a fixed record in that, but not vice-versa;

Referenced by casacore::Record::conform().

void casacore::RecordRep::copy_other ( const RecordRep other)
protected
void casacore::RecordRep::copyData ( const RecordRep other)

Copy all data of the Record.

void casacore::RecordRep::copyDataField ( DataType  type,
Int  whichField,
const void *  that 
) const

Copy a data field.

This can only handle scalars and arrays.

void casacore::RecordRep::copyDataField ( DataType  type,
void *  ptr,
const void *  that 
) const
protected

Copy a data field.

This can only handle scalars and arrays.

void* casacore::RecordRep::createDataField ( DataType  type,
const IPosition shape 
)
protected

Create a data field for the given type and shape.

This can only handle scalars and arrays.

void casacore::RecordRep::defineDataField ( Int  whichField,
DataType  type,
const void *  value 
)

Define a value for the given field.

Array conformance rules will not be applied for variable shaped arrays. When the field and value data type mismatch, type promotion of scalars will be done if possible. If not possible, an exception is thrown.

void casacore::RecordRep::delete_myself ( uInt  nfields)
protected

Utility functions to avoid code duplication in the public member functions.

void casacore::RecordRep::deleteDataField ( DataType  type,
void *  ptr,
void *  vecptr 
)
protected

Delete a data field.

This can only handle scalars and arrays.

const RecordDesc & casacore::RecordRep::description ( ) const
inline

Describes the current structure of this Record.

Definition at line 308 of file RecordRep.h.

References desc_p.

Referenced by casacore::Record::description().

virtual Int casacore::RecordRep::fieldNumber ( const String name) const
protectedvirtual

Get the field number for a given name.

Reimplemented in casacore::TableRecordRep.

void* casacore::RecordRep::get_pointer ( Int  whichField,
DataType  type 
) const

Used by the RecordFieldPtr classes to attach in a type-safe way to the correct field.

void* casacore::RecordRep::get_pointer ( Int  whichField,
DataType  type,
const String recordType 
) const
void casacore::RecordRep::getArrayKeys ( AipsIO os)
protected

Get the array values of a keyword set.

void casacore::RecordRep::getData ( AipsIO os,
uInt  version 
)

Read the data of a record.

This is used to read a subrecord, whose description has already been read.

Referenced by casacore::Record::getData().

void casacore::RecordRep::getDataField ( AipsIO os,
DataType  type,
void *  ptr 
)
protected

Get a data field.

This can only handle scalars and arrays.

void casacore::RecordRep::getKeyDesc ( AipsIO os,
RecordDesc desc 
)
protected

Get the description of a keyword set as a RecordDesc.

void casacore::RecordRep::getKeySet ( AipsIO os,
uInt  version,
uInt  type 
)
protected

Get a Scalar/ArrayKeywordSet object as a Record.

(type 0 = ScalarKeywordSet; type 1 = ArrayKeywordSet).

void casacore::RecordRep::getRecord ( AipsIO os,
Int recordType 
)

Get the description and data of the Record.

It also gets the fixedFlag attribute (of the mother object).

void casacore::RecordRep::getScalarKeys ( AipsIO os)
protected

Get the scalar values of a keyword set.

void casacore::RecordRep::makeDataVec ( Int  whichField,
DataType  type 
)
protected

Make an array for a scalar data field.

It shares the data, so a change in the data is reflected in the array. It is used to be able to access a scalar as an 1D array.

void casacore::RecordRep::merge ( const RecordRep other,
RecordInterface::DuplicatesFlag   
)

Merge all fields from the other record into this record.

void casacore::RecordRep::mergeField ( const RecordRep other,
Int  whichFieldFromOther,
RecordInterface::DuplicatesFlag   
)

Merge a field from another record into this record.

RecordRep& casacore::RecordRep::operator= ( const RecordRep other)

Copy all the data over.

void casacore::RecordRep::print ( std::ostream &  ,
Int  maxNrValues = 25,
const String indent = "" 
) const

Print a record.

Print the contents of the record. Only the first maxNrValues of an array will be printed. A value < 0 means the entire array.

void casacore::RecordRep::printDataField ( std::ostream &  os,
DataType  type,
const String indent,
Int  maxNrValues,
const void *  ptr 
) const
protected

Print a data field.

This can only handle scalars and arrays.

void casacore::RecordRep::putData ( AipsIO os) const

Put the data of a record.

This is used to write a subrecord, whose description has already been written.

Referenced by casacore::Record::putData().

void casacore::RecordRep::putDataField ( AipsIO os,
DataType  type,
const void *  ptr 
) const
protected

Put a data field.

This can only handle scalars and arrays.

void casacore::RecordRep::putRecord ( AipsIO os,
int  recordType 
) const

Put the description and data of the Record.

It also puts the fixedFlag attribute (of the mother object).

virtual void casacore::RecordRep::removeData ( Int  whichField,
void *  ptr,
void *  vecptr 
)
protectedvirtual

Remove a data field.

Reimplemented in casacore::TableRecordRep.

void casacore::RecordRep::removeDataPtr ( Int  index)
protected

Remove a data pointer add the given index.

void casacore::RecordRep::removeField ( Int  whichField)

Remove a field from the record.

virtual void casacore::RecordRep::removeFieldFromDesc ( Int  whichField)
protectedvirtual

Remove a field from the description.

Reimplemented in casacore::TableRecordRep.

void casacore::RecordRep::renameField ( const String newName,
Int  whichField 
)
inline

Rename the given field.

Definition at line 323 of file RecordRep.h.

References desc_p, and casacore::RecordDesc::renameField().

void casacore::RecordRep::restructure ( const RecordDesc newDescription,
Bool  recursive 
)

Change the structure of this Record to contain the fields in newDescription.

After calling restructure, description() == newDescription.

void casacore::RecordRep::setComment ( Int  whichField,
const String comment 
)
inline

Set the comment for this field.

Definition at line 318 of file RecordRep.h.

References desc_p, and casacore::RecordDesc::setComment().

Member Data Documentation

Block<void*> casacore::RecordRep::data_p
protected

Pointers to data values.

Definition at line 300 of file RecordRep.h.

Block<void*> casacore::RecordRep::datavec_p
protected

Pointers to a vector of a scalar (to access a scalar as an array).

Definition at line 302 of file RecordRep.h.

RecordDesc casacore::RecordRep::desc_p
protected

Holds the structure of this Record.

Definition at line 298 of file RecordRep.h.

Referenced by comment(), description(), renameField(), and setComment().

uInt casacore::RecordRep::nused_p
protected

#Entries used in data_p.

Definition at line 304 of file RecordRep.h.


The documentation for this class was generated from the following file: