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/* Copyright (c) 1992 The Geometry Center; University of Minnesota
1300 South Second Street; Minneapolis, MN 55454, USA;
This file is part of geomview/OOGL. geomview/OOGL is free software;
you can redistribute it and/or modify it only under the terms given in
the file COPYING, which you should have received along with this file.
This and other related software may be obtained via anonymous ftp from
geom.umn.edu; email: software@geom.umn.edu. */
/* Authors: Charlie Gunn, Stuart Levy, Tamara Munzner, Mark Phillips */
#ifndef _HANDLE_
#define _HANDLE_
/*
* Communications -- Public definitions for Handle package.
*/
#include "ooglutil.h"
#include "reference.h"
typedef struct Handle Handle;
typedef struct Pool Pool;
int HandleSetObject( Handle *, Ref *object );
Ref *HandleObject( Handle * );
void HandlePDelete(Handle **hp);
char *HandleName( Handle * );
void HandleDelete( Handle * );
Pool *HandlePool( Handle * );
#define IO_HANDLES 1
#define IO_COMPLETE 2
int HandleExport( Handle *, Pool * ); /* Export */
int HandleUnExport( Handle * ); /* Cancel exported object if possible */
int HandleImport( Handle * ); /* Import now (possibly blocking) */
Handle *PoolIn(Pool *p);
int PoolOutMode( int poflags ); /* Returns old IO mode */
/*
* Data-specific operations for (stream-type) Pools (files, pipes).
*/
typedef struct HandleOps {
char *prefix; /* Prefix for unique external naming */
int (*strmin) P((Pool *, Handle **, Ref **)); /* Read from stream */
int (*strmout) P((Pool *, Handle *, Ref *)); /* Write */
void (*Delete) P((Ref *)); /* Delete object */
int (*resync) P((Pool *)); /* Resync pool on import err */
int (*close) P((Pool *)); /* Close pool */
} HandleOps;
/*
* Given a string using the reference syntax,
* e.g. ``name:file'' or ``name:'',
* do whatever's necessary to create and return a handle to it.
* Might entail a lookup of an existing handle,
* or opening and possibly reading a file (as a stream-type Pool).
*/
extern Handle *HandleReferringTo(int prefixch, char *str, HandleOps *ops, Handle **hp);
/*
* Given a Handle's name and type (as given by HandleOps),
* return it or NULL if it doesn't exist.
*/
extern Handle *HandleByName( char *, HandleOps * );
/*
* If a Handle with this name already exists, return it;
* otherwise, create a new one with NULL value.
*/
extern Handle *HandleCreate( char *name, HandleOps *ops );
/*
* Set a Handle's object to obj, creating the Handle if necessary.
* Update all registered references to the Handle's value.
* Return the (possibly new) Handle.
*/
extern Handle *HandleAssign( char *name, HandleOps *ops, Ref *obj );
/*
* Register a reference to a Handle's value.
* Whenever the value changes, a call is made to:
* (*update)(Handle **hp, Ref *parentobject, void *info)
* It's intended that "info" will be a key used by the update
* procedure to know which reference to update.
* The update procedure is automatically called once when
* registration is done.
*/
extern int HandleRegister( Handle **hp, Ref *parent, void *info, void (*update)());
/*
* Unregister (all callbacks on) a reference to a Handle's value.
* It's important to do this when deleting an object,
* lest dangling pointers cause trouble.
* It's harmless to remove a reference which was never registered.
*/
extern void HandleUnregister(Handle **hp);
/* Unregister just one callback on a reference to a Handle's value.
* HandleUnregister() is the one to use when deleting an object.
* The viewer needs this to keep track of callbacks it plants
* throughout Geom trees, which trigger e.g. BBox recomputation.
*/
extern void HandleUnregisterJust(Handle **hp, Ref *par, void *info, void (*upd)());
/*
* Unregister all callbacks matching a given pattern, no matter
* which Handle they're associated with. Another routine needed
* for the viewer, called whenever a Geom tree is replaced.
*/
extern void HandleUnregisterAll(Ref *par, void *info, void (*upd)());
/*
* Suitable update() func for HandleRegister in many cases.
* Just deletes *objp then assigns *objp = (*hp)->object when called.
*/
extern void HandleUpdRef(Handle **hp, Ref *parent, Ref **objp);
#endif /*_HANDLE_*/
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