SoFieldContainer.h

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/*=======================================================================
** Author      : Gavin Bell (MMM yyyy)
**=======================================================================*/
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_FIELD_CONTAINER_
#define  _SO_FIELD_CONTAINER_
 
#include <Inventor/fields/SoSubFieldContainer.h>
#include <Inventor/misc/SoBase.h>
#include <Inventor/STL/set>
 
//
//  Class: SoFieldContainer
//
//  Base class for engines and nodes.  This takes care of keeping
//  track of the fields in a node, or the input fields of an engine;
//  reading them, writing them, copying them, etc.
//
 
class SbDict;
class SoFieldData;
class SoFieldList;
class SoField;
 
 
class  SoFieldContainer : public SoBase {
 
 public:
 
  static SoType getClassTypeId();
 
  void setToDefaults();
 
  SbBool hasDefaultValues() const;
 
  SbBool fieldsAreEqual(const SoFieldContainer *fc) const;
 
  void copyFieldValues(const SoFieldContainer *fc,
                       SbBool copyConnections = FALSE);
 
  SoNONUNICODE SbBool set(const char *fieldDataString)
    { return set(fieldDataString, NULL); }
  
  SbBool set(const SbString& fieldDataString)
    { return set(fieldDataString, NULL); }
 
  void get(SbString &fieldDataString)
    { get(fieldDataString, NULL); }
 
  virtual int getFields(SoFieldList &list) const;
 
  virtual int getAllFields(SoFieldList &list) const;
  // Added this method to allow the eventIns and eventOuts to be returned
  // along with the fields
 
  virtual SoField *getField(const SbName &fieldName) const;
 
  virtual SoField *getEventIn(const SbName &fieldName) const;
 
  virtual SoField *getEventOut(const SbName &fieldName) const;
 
  SbBool getFieldName(const SoField *field, SbName &fieldName) const;
 
  SbBool enableNotify(SbBool flag)
    { SbBool e = notifyEnabled; notifyEnabled = flag; return e; }
 
  SbBool isNotifyEnabled() const
    { return notifyEnabled; }
 
  virtual void setUserData(void *data)
    { m_userData = data; }
 
  void *getUserData(void) const
    { return m_userData; }
 
 private:
 
  // Setup type information
  static void initClass();
  static void exitClass();
 
  void connectFromAllCommonFields(const SoFieldContainer* source);
 
  void disconnectFromAllCommonFields(const SoFieldContainer* source);
 
  // This is used by the PROTOInstance to get the copy dictionary
  SbPList *getCopyDictionary()
    { return copyDictList; }
 
  // Versions of set() and get() that take SoInput or SoOutput from
  // which to inherit reference dictionary.
  SoNONUNICODE SbBool set(const char *fieldDataString, SoInput *dictIn);
  SbBool set(const SbString& fieldDataString, SoInput *dictIn);
  void get(SbString &fieldDataString, SoOutput *dictOut);
 
  // Propagates modification notification through an instance.
  virtual void notify(SoNotList *);
 
  // Manages dependencies between field (and member), update the container according to a change
  virtual void fieldHasChanged( SoField* field );
 
  // Initiates notification from an instance.
  virtual void startNotify();
 
  // Returns whether the about to be set field value is a valid one for
  // This container
  virtual SbBool validateNewFieldValue(SoField *pField, void *newValue);
 
  // Adds a reference to the instance when writing. isFromField
  // indicates whether the reference is from a field-to-field
  // connection.
  virtual void addWriteReference(SoOutput *out, SbBool isFromField = FALSE);
 
  // Writes instance to SoOutput. (Used only for last stage of writing)
  virtual void writeInstance(SoOutput *out);
 
  // Returns whether or not instance is considered 'built-in' to the
  // library. Used during writing.
  virtual SbBool getIsBuiltIn() const { return FALSE; }
 
  // Returns an SoFieldData structure for the node. Objects with no
  // fields should return NULL, which is what the default method does.
  virtual const SoFieldData *getFieldData() const;
 
  // During a copy operation, copies of nodes and engines are
  // stored in a dictionary, keyed by the original node or engine
  // pointer, so that copies can be re-used. These methods
  // operate on that dictionary.
 
  // Initializes a new copy dictionary
  static void initCopyDict();
 
  // Adds an instance to the dictionary
  static void addCopy(const SoFieldContainer *orig,
                      const SoFieldContainer *copy);
 
  // If a copy of the given instance is in the dictionary, this
  // returns it. Otherwise, it returns NULL. The copy is not changed
  // in any way.
  static SoFieldContainer *checkCopy(const SoFieldContainer *orig);
 
  // If a copy of the given instance is not in the dictionary, this
  // returns NULL. Otherwise, this copies the contents of the
  // original into the copy (if not already done) and returns a
  // pointer to the copy.
  static SoFieldContainer *findCopy(const SoFieldContainer *orig,
                                    SbBool copyConnections);
 
  // Cleans up the dictionary when done.
  static void copyDone();
 
  // Copies the contents of the given node into this instance. The
  // default implementation copies just field values and the name.
  virtual void copyContents(const SoFieldContainer *fromFC,
                            SbBool copyConnections);
 
  // During a copy operation, this copies an instance that is
  // encountered through a field connection. The default
  // implementation just returns the original pointer - no copy is
  // done. Subclasses such as nodes and engines handle this
  // differently.
  virtual SoFieldContainer *copyThroughConnection() const;
 
  // return all fieldContainer in parent path that satify the condition
  // defined by the given searchFieldContainerFunc function
  typedef bool searchFieldContainerFunc(const SoFieldContainer *fc);
  static void searchParents(SoFieldContainer* node, searchFieldContainerFunc *func, std::set<SoFieldContainer*>& fclist);
 
 private:
 
  // Is the subclass a built-in Inventor subclass or an extender subclass?
  // This is used to determine whether to read/write field type information.
  // MFO SbBool isBuiltIn;
 
  // Default constructor
  SoFieldContainer();
 
  // WARNING : Copy constructor should never be called.
  // WARNING : Implemented here only to add a debug message to derived class.
  SoFieldContainer(const SoFieldContainer&);
 
  // Destructor
  virtual ~SoFieldContainer();
 
  // Reads stuff into instance. Returns FALSE on error
  virtual SbBool readInstance(SoInput *in, unsigned short flags);
 
  static const SoFieldData** getFieldDataPtr() { return NULL; }
 
 private:
 
  // This pointer can be used by user to add informations in all nodes he use.
  // The user must allocate and deallocate this pointer.
  // Use it with setUserData and getUserData.
  void *m_userData;
 
  SbBool notifyEnabled; // Whether notification is enabled
 
  static SoType classTypeId;
 
  // This holds a list of SbDict instances used during copy
  // operations. It is a list to allow recursive copying.
  static SbPList *copyDictList;
 
  // These are used by SoFieldContainer::get() to hold
  // the returned field string
  static char *fieldBuf;
  static size_t fieldBufSize;
 
  // And this callback is used to unref() all instances in the
  // copyDict when copyDone() is called
  static void unrefCopy(uintptr_t key, void *instPtr);
 
  // This is used to reallocate the string buffer used by
  // SoFieldContainer::get()
  static void *reallocFieldBuf(void *ptr, size_t newSize);
 
private:
  // These 2 pointers allow to keep a linked list of all SoFieldContainer
  // created to be able to resync them in case of cluster Connection/disconnction.
  // they are fully managed by the SoFieldContainerExt class.
  SoFieldContainer *cacheNext;
  SoFieldContainer *cachePrev;
  friend class SoFieldContainerExt;
 
};
 
#endif  /* _SO_FIELD_CONTAINER_ */