bool PyViewer::GetItem(int row_, int col_, c4_Bytes &buf_) {
const c4_Property &prop = _template.NthProperty(col_);
if (_byPos) {
PWOSequence item(_data[row_]);
PyRowRef::setFromPython(_tempRow, prop, item[col_]);
return prop(_tempRow).GetData(buf_);
}
PyObject *item = _data[row_];
if (PyInstance_Check(item)) {
PyObject *attr = PyObject_GetAttrString(item, (char*)prop.Name());
PyRowRef::setFromPython(_tempRow, prop, attr);
return prop(_tempRow).GetData(buf_);
}
if (PyDict_Check(item)) {
PyObject *attr = PyDict_GetItemString(item, (char*)prop.Name());
PyRowRef::setFromPython(_tempRow, prop, attr);
return prop(_tempRow).GetData(buf_);
}
if (_template.NumProperties() == 1) {
PyRowRef::setFromPython(_tempRow, prop, _data[row_]);
return prop(_tempRow).GetData(buf_);
}
Fail(PyExc_ValueError, "Object has no usable attributes");
return false;
// create a row with just this single property value
// this detour handles dicts and objects, because makeRow does
/* c4_Row one;
PyView v (prop); // nasty, stack-based temp to get at makeRow
v.makeRow(one, _data[row_]);
return prop (one).GetData(buf_); */
}
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
}
bool c4_GroupByViewer::GetItem(int row_, int col_, c4_Bytes& buf_)
{
if (col_ < _keys.NumProperties())
return _sorted.GetItem(_map.GetAt(row_), col_, buf_);
d4_assert(col_ == _keys.NumProperties());
t4_i32 count;
switch (_result.Type())
{
case 'I': count = _map.GetAt(row_ + 1) - _map.GetAt(row_);
buf_ = c4_Bytes (&count, sizeof count, true);
break;
case 'V': _temp = _sorted.Slice(_map.GetAt(row_), _map.GetAt(row_ + 1))
.ProjectWithout(_keys);
buf_ = c4_Bytes (&_temp, sizeof _temp, true);
break;
default: d4_assert(0);
}
return true;
}
static void ViewDisplay(const c4_View& v_, int l_ =0)
{
c4_String types;
bool hasData = false, hasSubs = false;
// display header info and collect all data types
printf("%*s VIEW %5d rows =", l_, "", v_.GetSize());
for (int n = 0; n < v_.NumProperties(); ++n)
{
c4_Property prop = v_.NthProperty(n);
char t = prop.Type();
printf(" %s:%c", (const char*) prop.Name(), t);
types += t;
if (t == 'V')
hasSubs = true;
else
hasData = true;
}
printf("\n");
for (int j = 0; j < v_.GetSize(); ++j)
{
if (hasData) // data properties are all shown on the same line
{
printf("%*s %4d:", l_, "", j);
c4_RowRef r = v_[j];
c4_Bytes data;
for (int k = 0; k < types.GetLength(); ++k)
{
c4_Property p = v_.NthProperty(k);
switch (types[k])
{
case 'I':
printf(" %ld", (long) ((c4_IntProp&) p) (r));
break;
#if !q4_TINY
case 'F':
printf(" %g", (double) ((c4_FloatProp&) p) (r));
break;
case 'D':
printf(" %.12g", (double) ((c4_DoubleProp&) p) (r));
break;
#endif
case 'S':
printf(" '%s'", (const char*) ((c4_StringProp&) p) (r));
break;
case 'M': // backward compatibility
case 'B':
(p (r)).GetData(data);
printf(" (%db)", data.Size());
break;
default:
if (types[k] != 'V')
printf(" (%c?)", types[k]);
}
}
printf("\n");
}
if (hasSubs) // subviews are then shown, each as a separate block
{
for (int k = 0; k < types.GetLength(); ++k)
{
if (types[k] == 'V')
{
c4_Property prop = v_.NthProperty(k);
printf("%*s %4d: subview '%s'\n", l_, "", j,
(const char*) prop.Name());
c4_ViewProp& vp = (c4_ViewProp&) prop;
ViewDisplay(vp (v_[j]), l_ + 2);
}
}
}
}
}