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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/cdt/dtmethod.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#include	"dthdr.h"

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/*	Change search method.

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**

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**	Written by Kiem-Phong Vo (05/25/96)

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*/

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#if __STD_C

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Dtmethod_t* dtmethod(Dt_t* dt, Dtmethod_t* meth)

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#else

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Dtmethod_t* dtmethod(dt, meth)

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Dt_t*		dt;

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Dtmethod_t*	meth;

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#endif

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{

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	Dtlink_t	*list;

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	Dtdisc_t	*disc = dt->disc;

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	Dtmethod_t	*oldmt = dt->meth;

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	Dtdata_t	*newdt, *olddt = dt->data;

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	if(!meth || meth == oldmt)

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		return oldmt;

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	/* ask discipline if switching to new method is ok */

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	if(disc->eventf && (*disc->eventf)(dt,DT_METH,(Void_t*)meth,disc) < 0)

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		return NIL(Dtmethod_t*);

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	list = dtextract(dt); /* extract elements out of dictionary */

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	/* try to create internal structure for new method */

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	if(dt->searchf == oldmt->searchf) /* ie, not viewpathing */

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		dt->searchf = meth->searchf;

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	dt->meth = meth;

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	dt->data = NIL(Dtdata_t*);

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	if((*dt->meth->eventf)(dt, DT_OPEN, NIL(Void_t*)) < 0 )

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		newdt = NIL(Dtdata_t*);

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	else	newdt = dt->data;

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	/* see what need to be done to data of the old method */ 

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	if(dt->searchf == meth->searchf)

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		dt->searchf = oldmt->searchf;

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	dt->meth = oldmt;

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	dt->data = olddt;

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	if(newdt) /* switch was successful, remove old data */

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	{	(void)(*dt->meth->eventf)(dt, DT_CLOSE, NIL(Void_t*));

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		if(dt->searchf == oldmt->searchf)

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			dt->searchf = meth->searchf;

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		dt->meth = meth;

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		dt->data = newdt;

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		dtrestore(dt, list);

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		return oldmt;

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	}

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	else /* switch failed, restore dictionary to previous states */

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	{	dtrestore(dt, list); 

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		return NIL(Dtmethod_t*);

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	}

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}

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/* customize certain actions in a container data structure */

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int dtcustomize(Dt_t* dt, int type, int action)

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{

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	int	done = 0;

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	if((type&DT_SHARE) &&

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	   (!dt->meth->eventf || (*dt->meth->eventf)(dt, DT_SHARE, (Void_t*)((long)action)) >= 0) )

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	{	if(action <= 0 )

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			dt->data->type &= ~DT_SHARE;

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		else	dt->data->type |=  DT_SHARE;

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		done |= DT_SHARE;

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	}

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	if((type&DT_ANNOUNCE) &&

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	   (!dt->meth->eventf || (*dt->meth->eventf)(dt, DT_ANNOUNCE, (Void_t*)((long)action)) >= 0) )

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	{	if(action <= 0 )

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			dt->data->type &= ~DT_ANNOUNCE;

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		else	dt->data->type |=  DT_ANNOUNCE;

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		done |= DT_ANNOUNCE;

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	}

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	if((type&DT_OPTIMIZE) &&

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	   (!dt->meth->eventf || (*dt->meth->eventf)(dt, DT_OPTIMIZE, (Void_t*)((long)action)) >= 0) )

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		done |= DT_OPTIMIZE;

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	return done;

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}

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