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#include <cdt/dthdr.h>
#include <stdlib.h>
/* Change search method.
**
** Written by Kiem-Phong Vo (05/25/96)
*/
Dtmethod_t* dtmethod(Dt_t* dt, Dtmethod_t* meth)
{
Dtlink_t *list, *r;
Dtdisc_t* disc = dt->disc;
Dtmethod_t* oldmeth = dt->meth;
if(!meth || meth->type == oldmeth->type)
return oldmeth;
/* get the list of elements */
list = dtflatten(dt);
if (dt->data.type & DT_SET)
{ if (dt->data.ntab > 0)
free(dt->data.htab);
dt->data.ntab = 0;
dt->data.htab = NULL;
}
dt->data.here = NULL;
dt->data.type = (dt->data.type & ~(DT_METHODS|DT_FLATTEN)) | meth->type;
dt->meth = meth;
if(dt->searchf == oldmeth->searchf)
dt->searchf = meth->searchf;
if(meth->type&(DT_OSET|DT_OBAG))
{ dt->data.size = 0;
while(list)
{ r = list->right;
meth->searchf(dt, list, DT_RENEW);
list = r;
}
}
else if(oldmeth->type&DT_SET)
{ int rehash;
if((meth->type&DT_SET) && !(oldmeth->type&DT_SET))
rehash = 1;
else rehash = 0;
dt->data.size = 0;
dt->data.loop = 0;
while(list)
{ r = list->right;
if(rehash)
{ void* key = _DTOBJ(list,disc->link);
key = _DTKEY(key,disc->key,disc->size);
list->hash = dtstrhash(key, disc->size);
}
(void)meth->searchf(dt, list, DT_RENEW);
list = r;
}
}
return oldmeth;
}
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