jot: base_ref_image.C Source File

00001 /**********************************************************************
00002  * base_ref_image.C:
00003  **********************************************************************/
00004 #include "base_ref_image.H"
00005 
00006 HASH                     BaseVisRefImage::_hash(32);
00007 BaseVisRefImageFactory*  BaseVisRefImage::_factory = 0;
00008 
00009 BaseVisRefImage* 
00010 BaseVisRefImage::lookup(CVIEWptr& v) 
00011 {
00012    // Used instead of a public constructor. Lookup the BaseVisRefImage
00013    // associated w/ a view.  (If the view could know about this type,
00014    // we would probably just store the it on the view.)
00015 
00016    if (!v) {
00017       err_msg("BaseVisRefImage::lookup: error -- view is nil");
00018       return 0;
00019    }
00020 
00021    // hash on the view implementation rather than the view itself
00022    long key = (long)v->impl();
00023    BaseVisRefImage* ret = (BaseVisRefImage*) _hash.find(key);
00024    if (!ret && _factory && (ret = _factory->produce(v)))
00025       _hash.add(key, (void *)ret);
00026    return ret;
00027 }
00028 
00029 /* end of file base_ref_image.C */