SoFieldConverter(3) The SoFieldConverter class is the abstract base class for field converters.

SYNOPSIS


#include <Inventor/engines/SoFieldConverter.h>

Inherits SoEngine.

Public Member Functions


virtual SoType getTypeId (void) const

virtual const SoFieldData * getFieldData (void) const

virtual const SoEngineOutputData * getOutputData (void) const

virtual SoField * getInput (SoType type)=0

virtual SoEngineOutput * getOutput (SoType type)=0

virtual SoField * getConnectedInput (void)

int getForwardConnections (SoFieldList &l) const

Static Public Member Functions


static SoType getClassTypeId (void)

static void initClass (void)

static void initClasses (void)

Protected Member Functions


SoFieldConverter (void)

virtual ~SoFieldConverter (void)

Static Protected Member Functions


static const SoFieldData ** getInputDataPtr (void)

static const SoEngineOutputData ** getOutputDataPtr (void)

Detailed Description

The SoFieldConverter class is the abstract base class for field converters.

When fields of different types are attempted connected, the Coin library tries to find a field converter class which can be inserted between them, acting as a filter converting values from the master field to values matching the type of the slave field.

If a value type conversion is possible (like between an SoSFFloat field and an SoSFInt32 field, for instance, where we could do a simple typecast for converting the value of one to the other), an SoFieldConverter derived object is inserted.

This class is the abstract base superclass which all such field converters needs to inherit.

Coin comes with one built-in field converter class which takes care of all possible field-to-field conversions we know about. This means applications programmers should seldom need to care about this class, it will probably only be useful if you expand the Coin library with your own field type classes. (Doing so is considered advanced use of the library.)

See also:

SoDB::addConverter()

Constructor & Destructor Documentation

SoFieldConverter::SoFieldConverter (void) [protected]

Default constructor.

SoFieldConverter::~SoFieldConverter (void) [protected], [virtual]

Default destructor.

Member Function Documentation

SoType SoFieldConverter::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoEngine.

SoType SoFieldConverter::getTypeId (void) const [virtual]

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.

Usage example: 

  void foo(SoNode * node)
  {
    if (node->getTypeId() == SoFile::getClassTypeId()) {
      SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
    }
  }

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

const SoFieldData ** SoFieldConverter::getInputDataPtr (void) [static], [protected]

Returns the SoFieldData class which holds information about inputs in this engine.

Reimplemented from SoEngine.

const SoEngineOutputData ** SoFieldConverter::getOutputDataPtr (void) [static], [protected]

Returns the SoEngineOutputData class which holds information about the outputs in this engine.

Reimplemented from SoEngine.

const SoFieldData * SoFieldConverter::getFieldData (void) const [virtual]

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

const SoEngineOutputData * SoFieldConverter::getOutputData (void) const [virtual]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Implements SoEngine.

void SoFieldConverter::initClass (void) [static]

Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoEngine.

void SoFieldConverter::initClasses (void) [static]

Initializes all engines. Automatically called from SoEngine::initClass() upon initialization of Coin.

Reimplemented from SoEngine.

SoField * SoFieldConverter::getInput (SoTypetype) [pure virtual]

Returns input field for the converter engine. Must be overridden in non-abstract converter engine classes.

SoEngineOutput * SoFieldConverter::getOutput (SoTypetype) [pure virtual]

Returns output for the converter engine. Must be overridden in non-abstract converter engine classes.

SoField * SoFieldConverter::getConnectedInput (void) [virtual]

This method is obsoleted in Coin. It should probably have been private in OIV.

int SoFieldConverter::getForwardConnections (SoFieldList &l) const

Returns fields which are connected as slaves of the engine output.

Author

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