bool c4_View::IsCompatibleWith(const c4_View& dest_) const
{
// can't determine table without handlers (and can't be a table)
if (NumProperties() == 0 || dest_.NumProperties() == 0)
return false;
c4_Sequence* s1 = _seq;
c4_Sequence* s2 = dest_._seq;
c4_HandlerSeq* h1 = (c4_HandlerSeq*) s1->HandlerContext(0);
c4_HandlerSeq* h2 = (c4_HandlerSeq*) s2->HandlerContext(0);
// both must be real handler views, not derived ones
if (h1 != s1 || h2 != s2)
return false;
// both must not contain any temporary handlers
if (s1->NumHandlers() != h1->NumFields() ||
s2->NumHandlers() != h2->NumFields())
return false;
// both must be in the same storage
if (h1->Persist() == 0 || h1->Persist() != h2->Persist())
return false;
// both must have the same structure (is this expensive?)
c4_String d1 = h1->Definition().Description(true);
c4_String d2 = h1->Definition().Description(true);
return d1 == d2; // ignores all names
}
/** Constructs a new view with the same structure but no data
*
* Structural information can only be maintain for the top level,
* subviews will be included but without any properties themselves.
*/
c4_View c4_View::Clone()const {
c4_View view;
for (int i = 0; i < NumProperties(); ++i)
view._seq->PropIndex(NthProperty(i));
return view;
}
PyObject *PyView::properties() {
int n = NumProperties();
PWOMapping rslt;
for (int i = 0; i < n; i++) {
PyProperty *item = new PyProperty(NthProperty(i));
rslt.setItem(item->Name(), item);
Py_DECREF(item);
}
return rslt.disOwn();
}
void PyView::makeRow(c4_Row& tmp, PyObject* o, bool useDefaults) {
for (int i=0; i < NumProperties(); i++) {
const c4_Property& prop = NthProperty(i);
PyObject* attr = 0;
if (o) {
if (PyDict_Check(o))
{
attr = PyDict_GetItemString(o, (char *)prop.Name());
Py_XINCREF(attr);
}
else if (PySequence_Check(o))
{
attr = PySequence_GetItem(o, i);
}
else
{
attr = PyObject_GetAttrString(o, (char *)prop.Name());
if (attr == 0 && i == 0 && NumProperties() == 1)
{
PyErr_Clear();
attr = o;
Py_XINCREF(attr);
}
}
}
if (attr)
{
try { PyRowRef::setFromPython(tmp, prop, attr); }
catch (...) { Py_DECREF(attr); throw; }
Py_DECREF(attr);
}
else {
PyErr_Clear();
if (useDefaults)
PyRowRef::setDefault(tmp, prop);
}
}
if (!useDefaults)
if (tmp.Container().NumProperties() == 0)
Fail(PyExc_ValueError, "Object has no usable attributes");
}
/** Find the index of a property, given its name
* @return 0-based column index
* @retval -1 property not present in this view
*/
int c4_View::FindPropIndexByName(const char *name_
///< property name (case insensitive)
)const {
// use a slow linear scan to find the untyped property by name
for (int i = 0; i < NumProperties(); ++i) {
c4_String s = NthProperty(i).Name();
if (s.CompareNoCase(name_) == 0)
return i;
}
return - 1;
}
PyObject* PyView::structure() {
int n = NumProperties();
// PyObject* list=PyList_New(n);
// for (int i = 0; i < n; i++)
// PyList_SET_ITEM(list, i, new PyProperty(NthProperty(i)));
// return list;
PWOList rslt(n);
for (int i = 0; i < n; i++) {
PyProperty *prop = new PyProperty(NthProperty(i));
rslt.setItem(i, prop);
}
return rslt.disOwn();
}