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/*
* python/cursor - DB-All.e DB cursor python bindings
*
* Copyright (C) 2013 ARPA-SIM <urpsim@smr.arpa.emr.it>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author: Enrico Zini <enrico@enricozini.com>
*/
#include <Python.h>
#include <datetime.h>
#include "cursor.h"
#include "record.h"
#include "db.h"
#include "common.h"
using namespace std;
using namespace dballe;
using namespace dballe::python;
using namespace wreport;
extern "C" {
static PyObject* dpy_Cursor_remaining(dpy_Cursor* self, void* closure) { return PyInt_FromLong(self->cur->remaining()); }
static PyGetSetDef dpy_Cursor_getsetters[] = {
{"remaining", (getter)dpy_Cursor_remaining, NULL, "number of results still to be returned", NULL },
{NULL}
};
static PyObject* dpy_Cursor_query_attrs(dpy_Cursor* self, PyObject* args, PyObject* kw)
{
static char* kwlist[] = { "attrs", NULL };
PyObject* attrs = 0;
if (!PyArg_ParseTupleAndKeywords(args, kw, "|O", kwlist, &attrs))
return NULL;
// Read the attribute list, if provided
db::AttrList codes;
if (!db_read_attrlist(attrs, codes))
return NULL;
try {
self->cur->query_attrs(codes, self->db->attr_rec->rec);
Py_INCREF(self->db->attr_rec);
return (PyObject*)self->db->attr_rec;
} catch (wreport::error& e) {
return raise_wreport_exception(e);
} catch (std::exception& se) {
return raise_std_exception(se);
}
}
static PyMethodDef dpy_Cursor_methods[] = {
{"query_attrs", (PyCFunction)dpy_Cursor_query_attrs, METH_VARARGS | METH_KEYWORDS,
"Query attributes for the current variable" },
{NULL}
};
static int dpy_Cursor_init(dpy_Cursor* self, PyObject* args, PyObject* kw)
{
// People should not invoke Cursor() as a constructor, but if they do,
// this is better than a segfault later on
PyErr_SetString(PyExc_NotImplementedError, "Cursor objects cannot be constructed explicitly");
return -1;
}
static void dpy_Cursor_dealloc(dpy_Cursor* self)
{
delete self->cur;
Py_DECREF(self->rec);
Py_DECREF(self->db);
}
static PyObject* dpy_Cursor_iter(dpy_Cursor* self)
{
Py_INCREF(self);
return (PyObject*)self;
}
static PyObject* dpy_Cursor_iternext(dpy_Cursor* self)
{
if (self->cur->next())
{
self->cur->to_record(self->rec->rec);
Py_INCREF(self->rec);
return (PyObject*)self->rec;
} else {
PyErr_SetNone(PyExc_StopIteration);
return NULL;
}
}
static PyObject* dpy_Cursor_str(dpy_Cursor* self)
{
/*
std::string f = self->var.format("None");
return PyString_FromString(f.c_str());
*/
return PyString_FromString("Cursor");
}
static PyObject* dpy_Cursor_repr(dpy_Cursor* self)
{
/*
string res = "Var('";
res += varcode_format(self->var.code());
if (self->var.info()->is_string())
{
res += "', '";
res += self->var.format();
res += "')";
} else {
res += "', ";
res += self->var.format("None");
res += ")";
}
return PyString_FromString(res.c_str());
*/
return PyString_FromString("Cursor object");
}
PyTypeObject dpy_Cursor_Type = {
PyObject_HEAD_INIT(NULL)
0, // ob_size
"dballe.Cursor", // tp_name
sizeof(dpy_Cursor), // tp_basicsize
0, // tp_itemsize
(destructor)dpy_Cursor_dealloc, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
(reprfunc)dpy_Cursor_repr, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
(reprfunc)dpy_Cursor_str, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_ITER, // tp_flags
"DB-All.e Cursor", // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
(getiterfunc)dpy_Cursor_iter, // tp_iter
(iternextfunc)dpy_Cursor_iternext, // tp_iternext
dpy_Cursor_methods, // tp_methods
0, // tp_members
dpy_Cursor_getsetters, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
(initproc)dpy_Cursor_init, // tp_init
0, // tp_alloc
0, // tp_new
};
}
namespace dballe {
namespace python {
dpy_Cursor* cursor_create(dpy_DB* db, std::auto_ptr<db::Cursor> cur)
{
dpy_Cursor* result = PyObject_New(dpy_Cursor, &dpy_Cursor_Type);
if (!result) return NULL;
result = (dpy_Cursor*)PyObject_Init((PyObject*)result, &dpy_Cursor_Type);
Py_INCREF(db);
result->db = db;
result->cur = cur.release();
result->rec = record_create();
return result;
}
void register_cursor(PyObject* m)
{
PyDateTime_IMPORT;
dpy_Cursor_Type.tp_new = PyType_GenericNew;
if (PyType_Ready(&dpy_Cursor_Type) < 0)
return;
Py_INCREF(&dpy_Cursor_Type);
PyModule_AddObject(m, "Cursor", (PyObject*)&dpy_Cursor_Type);
}
}
}
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