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casacore::RegionHandler Class Reference

Base class for handling regions in images. More...

#include <RegionHandler.h>

Inheritance diagram for casacore::RegionHandler:
casacore::RegionHandlerHDF5 casacore::RegionHandlerMemory casacore::RegionHandlerTable

Public Types

enum  GroupType {
  Regions,
  Masks,
  Any
}
 Define the possible group types (regions or masks). More...
 

Public Member Functions

virtual ~RegionHandler ()
 
virtual RegionHandlerclone () const
 Make a copy of the object. More...
 
virtual void setObjectPtr (void *objectPtr)
 Set the object pointer (for RegionHandlerTable's callback). More...
 
virtual Bool canDefineRegion () const
 Can the class indeed define and handle regions? The default implementation returns False. More...
 
virtual void setDefaultMask (const String &maskName)
 Set the default mask to the mask with the given name. More...
 
virtual String getDefaultMask () const
 Get the name of the default mask. More...
 
virtual Bool defineRegion (const String &name, const ImageRegion &region, RegionHandler::GroupType, Bool overwrite=False)
 Define a region belonging to the table. More...
 
virtual Bool hasRegion (const String &name, RegionHandler::GroupType=RegionHandler::Any) const
 Does the table have a region with the given name? More...
 
virtual ImageRegiongetRegion (const String &name, RegionHandler::GroupType=Any, Bool throwIfUnknown=True) const
 Get a region belonging to the table. More...
 
virtual Bool renameRegion (const String &newName, const String &oldName, RegionHandler::GroupType=Any, Bool overwrite=False)
 Rename a region. More...
 
virtual Bool removeRegion (const String &name, RegionHandler::GroupType=Any, Bool throwIfUnknown=True)
 Remove a region belonging to the table. More...
 
virtual Vector< StringregionNames (RegionHandler::GroupType=Any) const
 Get the names of all regions/masks. More...
 
String makeUniqueRegionName (const String &rootName, uInt startNumber=1) const
 Make a unique region name from the given root name, thus make it such that the name is not already in use for a region or mask. More...
 
virtual ImageRegion makeMask (const LatticeBase &lattice, const String &name)
 Make a mask for a lattice (e.g. More...
 

Detailed Description

Base class for handling regions in images.

Intended use:

Internal

Review Status

Test programs:
tPagedImage2

Prerequisite

Synopsis

Persistent regions are stored as subrecords of the table keywords "regions" and "masks". The user can choose one of both keywords. Keyword "masks" is meant for true image masks, i.e. telling for each pixel if it is good or bad. Keyword "regions" is meant for true regions in an image.

This class handles defining, getting and removing such regions. It is used by class PagedImage, but it can also be used by other code to handle regions in other tables.

Another function performed by this class for PagedImage is the definition of the default region to be used with an image.

Example

Motivation

This class has 2 purposes:

  1. This untemplated code can be factored out from the templated Image classes.
  2. The functions can easily be used by other code.

Definition at line 93 of file RegionHandler.h.

Member Enumeration Documentation

Define the possible group types (regions or masks).

Enumerator
Regions 
Masks 
Any 

Definition at line 99 of file RegionHandler.h.

Constructor & Destructor Documentation

virtual casacore::RegionHandler::~RegionHandler ( )
virtual

Member Function Documentation

virtual Bool casacore::RegionHandler::canDefineRegion ( ) const
virtual

Can the class indeed define and handle regions? The default implementation returns False.

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

Referenced by casacore::ImageInterface< casacore::Complex >::canDefineRegion().

virtual RegionHandler* casacore::RegionHandler::clone ( ) const
virtual
virtual Bool casacore::RegionHandler::defineRegion ( const String name,
const ImageRegion region,
RegionHandler::GroupType  ,
Bool  overwrite = False 
)
virtual

Define a region belonging to the table.

The group type determines if it stored as a region or mask. If overwrite=False, an exception will be thrown if the region already exists in the "regions" or "masks" keyword. Otherwise the region will be removed first.
A False status is returned if the table is not writable

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual String casacore::RegionHandler::getDefaultMask ( ) const
virtual

Get the name of the default mask.

An empty string is returned if no default mask.

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual ImageRegion* casacore::RegionHandler::getRegion ( const String name,
RegionHandler::GroupType  = Any,
Bool  throwIfUnknown = True 
) const
virtual

Get a region belonging to the table.

A zero pointer is returned if the region does not exist. The caller has to delete the ImageRegion object created.
No exception is thrown if the region does not exist.

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual Bool casacore::RegionHandler::hasRegion ( const String name,
RegionHandler::GroupType  = RegionHandler::Any 
) const
virtual

Does the table have a region with the given name?

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual ImageRegion casacore::RegionHandler::makeMask ( const LatticeBase lattice,
const String name 
)
virtual

Make a mask for a lattice (e.g.

a PagedImage or TempImage). It creates it with the shape and tile shape of the lattice.

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

String casacore::RegionHandler::makeUniqueRegionName ( const String rootName,
uInt  startNumber = 1 
) const

Make a unique region name from the given root name, thus make it such that the name is not already in use for a region or mask.

The root name is returned if it is already unique. Otherwise a number is appended to the root name to make it unique. The number starts at the given number and is incremented until the name is unique.

virtual Vector<String> casacore::RegionHandler::regionNames ( RegionHandler::GroupType  = Any) const
virtual

Get the names of all regions/masks.

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual Bool casacore::RegionHandler::removeRegion ( const String name,
RegionHandler::GroupType  = Any,
Bool  throwIfUnknown = True 
)
virtual

Remove a region belonging to the table.


Optionally an exception is thrown if the region does not exist.
A False status is returned if the table is not writable

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual Bool casacore::RegionHandler::renameRegion ( const String newName,
const String oldName,
RegionHandler::GroupType  = Any,
Bool  overwrite = False 
)
virtual

Rename a region.

If a region with the new name already exists, it is deleted or an exception is thrown (depending on overwrite). The region name is looked up in the given group(s).
An exception is thrown if the old region name does not exist.

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual void casacore::RegionHandler::setDefaultMask ( const String maskName)
virtual

Set the default mask to the mask with the given name.

It constructs a ImageRegion object for the new default mask. If the table is writable, the setting is persistent by writing the name as a keyword. If the given maskName is the empty string, the default mask is unset.

Reimplemented in casacore::RegionHandlerTable, casacore::RegionHandlerHDF5, and casacore::RegionHandlerMemory.

virtual void casacore::RegionHandler::setObjectPtr ( void *  objectPtr)
virtual

Set the object pointer (for RegionHandlerTable's callback).

Default implementation does nothing.

Reimplemented in casacore::RegionHandlerTable, and casacore::RegionHandlerHDF5.


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