/** evaluate the link function */ public static Data link(VMethod m, Object[] o) throws VisADException { Data ans = null; if (o != null) { for (int i = 0; i < o.length; i++) { // convert VRealTypes to RealTypes if (o[i] instanceof VRealType) { o[i] = ((VRealType) o[i]).getRealType(); } } } try { ans = (Data) FormulaUtil.invokeMethod(m.getMethod(), o); } catch (ClassCastException exc) { if (FormulaVar.DEBUG) exc.printStackTrace(); throw new VisADException("Link error: invalid linked method"); } catch (IllegalAccessException exc) { if (FormulaVar.DEBUG) exc.printStackTrace(); throw new VisADException("Link error: cannot access linked method"); } catch (IllegalArgumentException exc) { if (FormulaVar.DEBUG) exc.printStackTrace(); throw new VisADException("Link error: bad method argument"); } catch (InvocationTargetException exc) { if (FormulaVar.DEBUG) exc.getTargetException().printStackTrace(); throw new VisADException("Link error: linked method threw an exception"); } if (ans == null) { throw new VisADException("Link error: linked method returned null data"); } return ans; }