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/* microprotocols.c - minimalist and non-validating protocols implementation

*

* Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>

*

* This file is part of psycopg and was adapted for pysqlite. Federico Di

* Gregorio gave the permission to use it within pysqlite under the following

* license:

*

* This software is provided 'as-is', without any express or implied

* warranty. In no event will the authors be held liable for any damages

* arising from the use of this software.

*

* Permission is granted to anyone to use this software for any purpose,

* including commercial applications, and to alter it and redistribute it

* freely, subject to the following restrictions:

*

* 1. The origin of this software must not be misrepresented; you must not

* claim that you wrote the original software. If you use this software

* in a product, an acknowledgment in the product documentation would be

* appreciated but is not required.

* 2. Altered source versions must be plainly marked as such, and must not be

* misrepresented as being the original software.

* 3. This notice may not be removed or altered from any source distribution.

*/

#include <Python.h>

#include "cursor.h"

#include "microprotocols.h"

#include "prepare_protocol.h"

/* pysqlite_microprotocols_init - initialize the adapters dictionary */

int

pysqlite_microprotocols_init(PyObject *module)

{

/* create adapters dictionary and put it in module namespace */

pysqlite_state *state = pysqlite_get_state(module);

state->psyco_adapters = PyDict_New();

if (state->psyco_adapters == NULL) {

return -1;

}

return PyModule_AddObjectRef(module, "adapters", state->psyco_adapters);

}

/* pysqlite_microprotocols_add - add a reverse type-caster to the dictionary */

int

pysqlite_microprotocols_add(pysqlite_state *state, PyTypeObject *type,

PyObject *proto, PyObject *cast)

{

PyObject* key;

int rc;

assert(type != NULL);

assert(proto != NULL);

key = PyTuple_Pack(2, (PyObject *)type, proto);

if (!key) {

return -1;

}

rc = PyDict_SetItem(state->psyco_adapters, key, cast);

Py_DECREF(key);

return rc;

}

/* pysqlite_microprotocols_adapt - adapt an object to the built-in protocol */

PyObject *

pysqlite_microprotocols_adapt(pysqlite_state *state, PyObject *obj,

PyObject *proto, PyObject *alt)

{

PyObject *adapter, *key, *adapted;

/* we don't check for exact type conformance as specified in PEP 246

because the PrepareProtocolType type is abstract and there is no

way to get a quotable object to be its instance */

/* look for an adapter in the registry */

key = PyTuple_Pack(2, (PyObject *)Py_TYPE(obj), proto);

if (!key) {

return NULL;

}

adapter = PyDict_GetItemWithError(state->psyco_adapters, key);

Py_DECREF(key);

if (adapter) {

Py_INCREF(adapter);

adapted = PyObject_CallOneArg(adapter, obj);

Py_DECREF(adapter);

return adapted;

}

if (PyErr_Occurred()) {

return NULL;

}

/* try to have the protocol adapt this object */

if (_PyObject_LookupAttr(proto, state->str___adapt__, &adapter) < 0) {

return NULL;

}

if (adapter) {

adapted = PyObject_CallOneArg(adapter, obj);

Py_DECREF(adapter);

if (adapted == Py_None) {

Py_DECREF(adapted);

}

else if (adapted || !PyErr_ExceptionMatches(PyExc_TypeError)) {

return adapted;

}

else {

PyErr_Clear();

}

}

/* and finally try to have the object adapt itself */

if (_PyObject_LookupAttr(obj, state->str___conform__, &adapter) < 0) {

return NULL;

}

if (adapter) {

adapted = PyObject_CallOneArg(adapter, proto);

Py_DECREF(adapter);

if (adapted == Py_None) {

Py_DECREF(adapted);

}

else if (adapted || !PyErr_ExceptionMatches(PyExc_TypeError)) {

return adapted;

}

else {

PyErr_Clear();

}

}

if (alt) {

return Py_NewRef(alt);

}

/* else set the right exception and return NULL */

PyErr_SetString(state->ProgrammingError, "can't adapt");

return NULL;

}