152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/* microprotocols.c - minimalist and non-validating protocols implementation
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*
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* Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
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*
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* This file is part of psycopg and was adapted for pysqlite. Federico Di
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* Gregorio gave the permission to use it within pysqlite under the following
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* license:
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include <Python.h>
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#include "cursor.h"
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#include "microprotocols.h"
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#include "prepare_protocol.h"
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/** the adapters registry **/
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static PyObject *psyco_adapters = NULL;
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/* pysqlite_microprotocols_init - initialize the adapters dictionary */
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int
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pysqlite_microprotocols_init(PyObject *module)
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{
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/* create adapters dictionary and put it in module namespace */
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if ((psyco_adapters = PyDict_New()) == NULL) {
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return -1;
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}
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if (PyModule_AddObject(module, "adapters", psyco_adapters) < 0) {
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Py_DECREF(psyco_adapters);
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return -1;
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}
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return 0;
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}
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/* pysqlite_microprotocols_add - add a reverse type-caster to the dictionary */
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int
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pysqlite_microprotocols_add(PyTypeObject *type, PyObject *proto, PyObject *cast)
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{
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PyObject* key;
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int rc;
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if (proto == NULL) proto = (PyObject*)pysqlite_PrepareProtocolType;
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key = Py_BuildValue("(OO)", (PyObject*)type, proto);
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if (!key) {
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return -1;
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}
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rc = PyDict_SetItem(psyco_adapters, key, cast);
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Py_DECREF(key);
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return rc;
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}
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/* pysqlite_microprotocols_adapt - adapt an object to the built-in protocol */
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PyObject *
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pysqlite_microprotocols_adapt(PyObject *obj, PyObject *proto, PyObject *alt)
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{
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_Py_IDENTIFIER(__adapt__);
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_Py_IDENTIFIER(__conform__);
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PyObject *adapter, *key, *adapted;
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/* we don't check for exact type conformance as specified in PEP 246
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because the pysqlite_PrepareProtocolType type is abstract and there is no
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way to get a quotable object to be its instance */
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/* look for an adapter in the registry */
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key = Py_BuildValue("(OO)", (PyObject*)Py_TYPE(obj), proto);
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if (!key) {
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return NULL;
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}
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adapter = PyDict_GetItemWithError(psyco_adapters, key);
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Py_DECREF(key);
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if (adapter) {
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Py_INCREF(adapter);
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adapted = PyObject_CallOneArg(adapter, obj);
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Py_DECREF(adapter);
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return adapted;
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}
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if (PyErr_Occurred()) {
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return NULL;
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}
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/* try to have the protocol adapt this object */
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if (_PyObject_LookupAttrId(proto, &PyId___adapt__, &adapter) < 0) {
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return NULL;
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}
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if (adapter) {
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adapted = PyObject_CallOneArg(adapter, obj);
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Py_DECREF(adapter);
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if (adapted == Py_None) {
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Py_DECREF(adapted);
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}
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else if (adapted || !PyErr_ExceptionMatches(PyExc_TypeError)) {
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return adapted;
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}
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else {
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PyErr_Clear();
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}
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}
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/* and finally try to have the object adapt itself */
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if (_PyObject_LookupAttrId(obj, &PyId___conform__, &adapter) < 0) {
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return NULL;
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}
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if (adapter) {
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adapted = PyObject_CallOneArg(adapter, proto);
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Py_DECREF(adapter);
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if (adapted == Py_None) {
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Py_DECREF(adapted);
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}
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else if (adapted || !PyErr_ExceptionMatches(PyExc_TypeError)) {
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return adapted;
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}
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else {
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PyErr_Clear();
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}
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}
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if (alt) {
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Py_INCREF(alt);
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return alt;
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}
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/* else set the right exception and return NULL */
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PyErr_SetString(pysqlite_ProgrammingError, "can't adapt");
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return NULL;
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}
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