SoFieldData.h

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/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
** Modified by : Nick Thompson (MMM yyyy)
** Modified by : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
 
#ifndef  _SO_FIELD_DATA_
#define  _SO_FIELD_DATA_
 
#include <Inventor/misc/SoBasic.h>
#include <Inventor/SbPList.h>
#include <Inventor/SbString.h>
 
class SoField;
class SoInput;
class SoFieldContainer;
class SoOutput;
 
//
//  Class: SoFieldData
//
//  The SoFieldData class holds data about fields of an object: the
//  number of fields the object has, the names of the fields, and a
//  pointer to a prototype instance of the field. (Typically, this
//  prototype field is contained within a prototype instance of the
//  node or engine.)
//
//  All objects of a given class share the same field data. Therefore,
//  to get information about a particular field in a particular object
//  instance, it is necessary to pass that instance to the appropriate
//  method.
//
 
{
 public:
  // Constructor
  SoFieldData() {}
 
  // Copy constructors
  SoFieldData(const SoFieldData &);
  SoFieldData(const SoFieldData *);
 
  // Constructor that takes number of fields as a hint
  SoFieldData(int numFields) : fields(numFields) {}
 
  // Destructor
  ~SoFieldData();
 
  // Adds a field to current data, given default value object, name of
  // field and pointer to field within default value object. This is
  // used to define fields of a FieldContainer (node or engine) class.
  void  addField(SoFieldContainer *defObject,
                               const char *fieldName,
                               const SoField *field);
 
  // Copy values and flags of fields from one object to another (of
  // the same type). If copyConnections is TRUE, any connections to
  // the fields are copied as well
  void                overlay(SoFieldContainer *to,
                              const SoFieldContainer *from,
                              SbBool copyConnections) const;
 
  // Returns number of fields
  int                 getNumFields() const    { return fields.getLength(); }
 
  // Returns name of field with given index
  const SbName &      getFieldName(int index) const;
 
  // Returns name of field with given adress
  SbString getFieldName(const SoFieldContainer *object, const SoField* field) const;
 
  // Returns pointer to field with given name
  SoField* getField(const SoFieldContainer *object, const SbString& name) const;
 
  // Returns pointer to field with given index within given object instance
  SoField *           getField(const SoFieldContainer *object,
                               int index) const;
 
  // Returns index of field, given the field and the instance it is in
  int                 getIndex(const SoFieldContainer *fc,
                               const SoField *field) const;
 
  // Enum name/value mechanism
  void                addEnumValue(const char *typeName,
                                   const char *valName, int val);
  void                getEnumData(char *typeName, int &num,
                                  int *&vals, SbName *&names);
  void                getEnumValueName(char *typeName, int val, SbName *&name);
 
 private:
 
  // Reads into fields according to SoInput. The third
  // parameter indicates whether an unknown field should be reported
  // as an error; this can be FALSE for nodes that have children.
  // The last argument will be set to TRUE if a description of the
  // fields (using the "inputs" or "fields" keywords) was read.
  SbBool              read(SoInput *in, SoFieldContainer *object,
                           SbBool errorOnUnknownField,
                           SbBool &notBuiltIn) const;
 
  // This function is used when the field name has already been
  // read, and just the value needs to be read in.  It is used by
  // the above read() method and to read in GlobalFields.  It
  // returns TRUE if there were no problems reading, and will return
  // FALSE in 'foundName' if the given name is not the name of one
  // of the fields in the fieldData.
  SbBool              read(SoInput *in, SoFieldContainer *object,
                           const SbName &fieldName,
                           SbBool &foundName) const;
 
  // Writes all fields of object according to SoOutput
  void                write(SoOutput *out,
                            const SoFieldContainer *object) const;
 
  // Copies all fields from given field data into this one, creating
  // new fields for them
  void                copy(const SoFieldData *from);
 
  // Returns TRUE if the values in the fields of one container are
  // the same as those in another (of the same type)
  SbBool              isSame(const SoFieldContainer *c1,
                             const SoFieldContainer *c2) const;
 
  // Read field type information
  SbBool              readEventIn(
                                  SoInput *in, SoFieldContainer *object ) const;
 
  SbBool              readEventOut(
                                   SoInput *in, SoFieldContainer *object ) const;
 
  // Read field type information
  SbBool              readVField(
                                 SoInput *in, SoFieldContainer *object ) const;
  // Read field type information
  SbBool              readVExposedField(
                                        SoInput *in, SoFieldContainer *object ) const;
 
  // Read field type information
  SbBool              readFieldDescriptions(
                                            SoInput *in, SoFieldContainer *object,
                                            int numDescriptionsExpected) const;
 
  // Write field type information
  void                writeFieldDescriptions(
                                             SoOutput *out,
                                             const SoFieldContainer *object) const;
 
 private:
  // Used by binary reading to read in all the fields:
  SbBool              readFields(
                                 SoInput *in, SoFieldContainer *object,
                                 int numFieldsWritten) const;
 
  SbPList             fields;         // List of fields (SoFieldEntry)
  SbPList             enums;          // List of enums (SoEnumEntry)
 
  struct SoFieldEntry
  {
    SbName name;     // Name of field
    int64_t offset;  // Offset of field within object
    bool noObj;
  };
 
  struct SoEnumEntry
  {
  SbName typeName;  // Name of enum type
  int num;  // number of values
  int arraySize;  // size of arrays
  int *vals;  // array of values
  SbName *names;  // array of names
 
  SoEnumEntry(const SbName &name);
  SoEnumEntry(const SoEnumEntry &o);
  ~SoEnumEntry();
 
  static int growSize;  // amount to grow arrays
  };
 
};
 
#endif /* _SO_FIELD_DATA_ */