/***********************************************************************/
/* Open Visualization Data Explorer                                    */
/* (C) Copyright IBM Corp. 1989,1999                                   */
/* ALL RIGHTS RESERVED                                                 */
/* This code licensed under the                                        */
/*    "IBM PUBLIC LICENSE - Open Visualization Data Explorer"          */
/***********************************************************************/

/*
\section{Object class}

Every object begins with an object preamble, which contains the class
number and a reference count.
*/

#include <dx/dx.h>

/* the following make ANSI compilers happier */
struct shade;
struct buffer;
struct tile;
struct gather;
struct survey;
struct count;

CLASS Object
DEFINES Error  Delete(Object)
DEFINES Error  Shade(Object, struct shade *)
DEFINES Object BoundingBox(Object, Point*, Matrix*, int)
DEFINES Object Paint(Object, struct buffer *, int, struct tile *)
DEFINES Object Gather(Object, struct gather *, struct tile *)
DEFINES Error  Partition(Object, int*, int, Object*, int)
DEFINES Object GetType(Object, Type*, Category*, int*, int*);
DEFINES Object Copy(Object, enum copy)
IMPLEMENTS Delete BoundingBox Shade

#define NATTRIBUTES 2			/* number of attributes in object */

struct object {				/* object preamble */
    struct object_class *class;		/* class vector */
    Class class_id;			/* class id (for debugging only!) */
    lock_type lock;			/* for Reference and Delete */
    int count;				/* reference count */
    int tag;				/* object tag */
    struct attribute {			/* object attributes */
	char *name;			/* attribute name */
	Object value;			/* attribue value */
    } local[NATTRIBUTES], *attributes;	/* the attributes */
    int nattributes;			/* number of attributes */
    int attr_alloc;			/* allocated space for attributes */
};

#if 0 /* was if OPTIMIZED */
#define CHECK(obj, cls) { \
    if (!obj) \
	return NULL; \
}
#else
#define CHECK(obj, cls) { \
    if (!obj) \
        return NULL; \
    if (DXGetObjectClass((Object)(obj)) != cls) \
        DXErrorReturn(ERROR_BAD_CLASS, "called with object of wrong class"); \
}
#endif
/**
This macro eases the task of checking argument class.  Note: This is not needed
when a method implementation is called, because {\tt o} and its class will
both have been checked by the method.
**/

Object _dxf_NewObject(struct object_class *class);
/**
This internal routine is called only by other {\tt New...} routines to
create and initialize the object preamble.
**/

Object _dxf_CopyObject(Object new, Object old, enum copy copy);
/**
Copies the portion of the data of {\tt old} managed by the {\tt
Object} class to {\tt new}.  This is provided for subclasses of {\tt Object}
to use in their copy routines.  Copying works something like creating
an object.  Every class {\tt X} that implements copying should provide
an {\tt \_CopyX} routine that copies relevant data from an old object
to a new object, so that subclass copy routines may call this routine
to copy the superclass's data.  The {\tt CopyX} routine just creates a
new object of the appropriate type and then calls {\tt \_CopyX} to copy
the data.
**/