NAME

       SoFieldData -

       The SoFieldData class is a container for a prototype set of fields.

       This class is instantiated once for each class of objects which use fields, and which needs to be able to
       import and export them.

SYNOPSIS

       #include <Inventor/fields/SoFieldData.h>

   Public Member Functions
       SoFieldData (void)
       SoFieldData (const SoFieldData &fd)
       SoFieldData (const SoFieldData *fd)
       SoFieldData (int numfields)
       ~SoFieldData ()
       void addField (SoFieldContainer *base, const char *name, const SoField *field)
       void overlay (SoFieldContainer *to, const SoFieldContainer *from, SbBool copyconnections) const
       int getNumFields (void) const
       const SbName & getFieldName (int index) const
       SoField * getField (const SoFieldContainer *object, int index) const
       int getIndex (const SoFieldContainer *fc, const SoField *field) const
       void addEnumValue (const char *enumname, const char *valuename, int value)
       void getEnumData (const char *enumname, int &num, const int *&values, const SbName *&names)
       SbBool read (SoInput *input, SoFieldContainer *object, SbBool erroronunknownfield, SbBool &notbuiltin)
           const
       SbBool read (SoInput *input, SoFieldContainer *object, const SbName &fieldname, SbBool &foundname) const
       void write (SoOutput *out, const SoFieldContainer *object) const
       void copy (const SoFieldData *src)
       SbBool isSame (const SoFieldContainer *c1, const SoFieldContainer *c2) const
       SbBool readFieldDescriptions (SoInput *input, SoFieldContainer *object, int numdescriptionsexpected,
           const SbBool readfieldvalues=TRUE) const
       void writeFieldDescriptions (SoOutput *out, const SoFieldContainer *object) const

Detailed Description

       The SoFieldData class is a container for a prototype set of fields.

       This class is instantiated once for each class of objects which use fields, and which needs to be able to
       import and export them.

       Each field of a class is stored with the name it has been given within its 'owner' class and a pointer
       offset to the dynamic instance of the field itself.

       Enumeration sets are stored with (name, value) pairs, to make it possible to address, read and save enum
       type fields by name.

       It is unlikely that application programmers should need to use any of the methods of this class directly.

       See Also:
           SoField, SoFieldContainer

Constructor & Destructor Documentation

   SoFieldData::SoFieldData (void)
       Default constructor.

   SoFieldData::SoFieldData (const SoFieldData &fd)
       Copy constructor.

   SoFieldData::SoFieldData (const SoFieldData *fd)
       Copy constructor taking a pointer value as an argument. Handles NULL pointers by behaving like the
       default constructor.

   SoFieldData::SoFieldData (intnumfields)
       Constructor. Takes an indication on the number of fields which should be stored, to make sure the memory
       handling is efficient.

   SoFieldData::~SoFieldData ()
       Destructor.

Member Function Documentation

   void SoFieldData::addField (SoFieldContainer *base, const char *name, const SoField *field)
       Add a new field to our internal list.

       The name will be stored along with an pointer offset between base and field, which will be valid for all
       instances of the class type of base.

   void SoFieldData::overlay (SoFieldContainer *to, const SoFieldContainer *from, SbBoolcopyconnections) const
       Copy fields from container from to container to. If copyconnections is TRUE, we'll also copy the
       connections field from has made.

       If you think the method signature is a bit strange, you're correct. This should really have been a static
       method (the owner this instance of the method isn't used at all, due to how the internal representation
       of field template list are stored), but for unknown reasons this is a dynamic method in Open Inventor. So
       also in Coin, to keep compatibility.

   int SoFieldData::getNumFields (void) const
       Returns number of fields contained within this instance.

   const SbName & SoFieldData::getFieldName (intindex) const
       Returns the name of the field at index.

   SoField * SoFieldData::getField (const SoFieldContainer *object, intindex) const
       Returns a pointer to the field at index within the object instance.

   int SoFieldData::getIndex (const SoFieldContainer *fc, const SoField *field) const
       Returns the internal index value of field in fc. If field is not part of fc, returns -1.

   void SoFieldData::addEnumValue (const char *enumname, const char *valuename, intvalue)
       Either adds a new enum set (with an initial member), or adds a new value member to an existing enum set.

   void SoFieldData::getEnumData (const char *enumname, int &num, const int *&values, const SbName *&names)
       Returns the names and values of enumeration entry with the enumname. The number of (name, value) pairs
       available in the enumeration is returned in num.

   SbBool SoFieldData::read (SoInput *in, SoFieldContainer *object, SbBoolerroronunknownfield, SbBool
       &notbuiltin) const
       Read field data from the in stream for fields belonging to object. Returns TRUE if everything went ok, or
       FALSE if any error conditions occurs.

       erroronunknownfield decides whether or not FALSE should be returned if a name identifier not recognized
       as a fieldname of object is encountered. Note that erroronunknownfield should be FALSE if object is a
       container with child objects, otherwise the code will fail upon the first child name specification.

       If notbuiltin is TRUE on return, object is an unknown node or engine type. Unknown nodes are recognized
       by the fields keyword first in their file format definition, and unknown engines by the inputs keyword.

   SbBool SoFieldData::read (SoInput *in, SoFieldContainer *object, const SbName &fieldname, SbBool &foundname)
       const
       Find field fieldname in object, and if it is available, set foundname to TRUE and try to read the field
       specification from in. If foundname is set to TRUE, the return value says whether or not the field
       specification could be read without any problems.

       If fieldname is not part of object, returns FALSE with foundname also set to FALSE.

   void SoFieldData::write (SoOutput *out, const SoFieldContainer *object) const
       Write to out field names and field values for the fields of object.

   void SoFieldData::copy (const SoFieldData *src)
       Copy contents of src into this instance.

       If there was any data set up in this instance before the method was called, the old data is removed
       first.

       Note that this only copies the field set template specification from src, not actual field contents. For
       copying field contents, see the SoFieldData::overlay() method.

   SbBool SoFieldData::isSame (const SoFieldContainer *c1, const SoFieldContainer *c2) const
       Compares c1 and c2 to see if they have the same field data set and if the fields of c1 have the same
       values as the fields of c2.

       Field connections are not considered (i.e. we will return TRUE if the values of the fields of c1 are
       equal to the fields of c2, even if they differ in how they have made connections to other fields).

       If you think the method signature is a bit strange, you're correct. This should really have been a static
       method (the owner this instance of the method isn't used at all, due to how the internal representations
       of field template lists are stored), but for unknown reasons this is a dynamic method in Open Inventor.
       So also in Coin, to keep compatibility.

   SbBool SoFieldData::readFieldDescriptions (SoInput *in, SoFieldContainer *object, intnumdescriptionsexpected,
       const SbBoolreadfieldvalues = TRUE) const
       Reads a set of field specifications from in for an unknown nodeclass type, in the form '[ FIELDCLASS
       FIELDNAME, FIELDCLASS FIELDNAME, ... ]'.

       numdescriptionsexpected is used for binary format import to know how many descriptions should be parsed.

       If readfieldvalues is TRUE (the default), the field initial value is expected after the field name in the
       SoInput stream.

   void SoFieldData::writeFieldDescriptions (SoOutput *out, const SoFieldContainer *object) const
       Write a set of field specifications to out for an unknown nodeclass type, in the form '[ FIELDCLASS
       FIELDNAME, FIELDCLASS FIELDNAME, ... ]'.

Author

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