@classmethod<EOL><INDENT>def fromJSON(cls, jdata):<DEDENT>
cls_type = jdata.get('<STR_LIT:type>')<EOL>col_cls = cls.byName(cls_type)<EOL>if not col_cls:<EOL><INDENT>raise orb.errors.ColumnTypeNotFound(cls_type)<EOL><DEDENT>else:<EOL><INDENT>col = col_cls()<EOL>col.loadJSON(jdata)<EOL>return col<EOL><DEDENT>
Generates a new column from the given json data.  This should
be already loaded into a Python dictionary, not a JSON string.

:param      jdata | <dict>

:return     <orb.Column> || None