First checkin of the Python XPCOM bindings.

git-svn-id: svn://10.0.0.236/trunk@87331 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/extensions/python/xpcom/src/PyISimpleEnumerator.cpp

@@ -0,0 +1,165 @@
+/* Copyright (c) 2000-2001 ActiveState Tool Corporation.
+   See the file LICENSE.txt for licensing information. */
+
+//
+// This code is part of the XPCOM extensions for Python.
+//
+// Written May 2000 by Mark Hammond.
+//
+// Based heavily on the Python COM support, which is
+// (c) Mark Hammond and Greg Stein.
+//
+// (c) 2000, ActiveState corp.
+
+#include "PyXPCOM_std.h"
+#include <nsISimpleEnumerator.h>
+
+static nsISimpleEnumerator *GetI(PyObject *self) {
+	nsIID iid = NS_GET_IID(nsISimpleEnumerator);
+
+	if (!Py_nsISupports::Check(self, iid)) {
+		PyErr_SetString(PyExc_TypeError, "This object is not the correct interface");
+		return NULL;
+	}
+	return (nsISimpleEnumerator *)Py_nsISupports::GetI(self);
+}
+
+
+static PyObject *PyHasMoreElements(PyObject *self, PyObject *args)
+{
+	if (!PyArg_ParseTuple(args, ":HasMoreElements"))
+		return NULL;
+
+	nsISimpleEnumerator *pI = GetI(self);
+	if (pI==NULL)
+		return NULL;
+
+	nsresult r;
+	PRBool more;
+	Py_BEGIN_ALLOW_THREADS;
+	r = pI->HasMoreElements(&more);
+	Py_END_ALLOW_THREADS;
+	if ( NS_FAILED(r) )
+		return PyXPCOM_BuildPyException(r);
+	return PyInt_FromLong(more);
+}
+
+static PyObject *PyGetNext(PyObject *self, PyObject *args)
+{
+	PyObject *obIID = NULL;
+	if (!PyArg_ParseTuple(args, "|O:GetNext", &obIID))
+		return NULL;
+
+	nsIID iid(NS_GET_IID(nsISupports));
+	if (obIID != NULL && !Py_nsIID::IIDFromPyObject(obIID, &iid))
+		return NULL;
+	nsISimpleEnumerator *pI = GetI(self);
+	if (pI==NULL)
+		return NULL;
+
+	nsISupports *pRet = nsnull;
+	nsresult r;
+	Py_BEGIN_ALLOW_THREADS;
+	r = pI->GetNext(&pRet);
+	Py_END_ALLOW_THREADS;
+	if ( NS_FAILED(r) )
+		return PyXPCOM_BuildPyException(r);
+	if (obIID) {
+		nsISupports *temp;
+		Py_BEGIN_ALLOW_THREADS;
+		r = pRet->QueryInterface(iid, (void **)&temp);
+		pRet->Release();
+		Py_END_ALLOW_THREADS;
+		if ( NS_FAILED(r) ) {
+			return PyXPCOM_BuildPyException(r);
+		}
+		pRet = temp;
+	}
+	return Py_nsISupports::PyObjectFromInterface(pRet, iid, PR_FALSE);
+}
+
+// A method added for Python performance if you really need
+// it.  Allows you to fetch a block of objects in one
+// hit, allowing the loop to remain implemented in C.
+static PyObject *PyFetchBlock(PyObject *self, PyObject *args)
+{
+	PyObject *obIID = NULL;
+	int n_wanted;
+	int n_fetched = 0;
+	if (!PyArg_ParseTuple(args, "i|O:FetchBlock", &n_wanted, &obIID))
+		return NULL;
+
+	nsIID iid(NS_GET_IID(nsISupports));
+	if (obIID != NULL && !Py_nsIID::IIDFromPyObject(obIID, &iid))
+		return NULL;
+	nsISimpleEnumerator *pI = GetI(self);
+	if (pI==NULL)
+		return NULL;
+
+	// We want to fetch with the thread-lock released,
+	// but this means we can not append to the PyList
+	nsISupports **fetched = new nsISupports*[n_wanted];
+	if (fetched==nsnull) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+	memset(fetched, 0, sizeof(nsISupports *) * n_wanted);
+	nsresult r;
+	PRBool more;
+	Py_BEGIN_ALLOW_THREADS;
+	for (;n_fetched<n_wanted;) {
+		r = pI->HasMoreElements(&more);
+		if (NS_FAILED(r))
+			break; // this _is_ an error!
+		if (!more)
+			break; // Normal enum end.
+		nsISupports *pNew;
+		r = pI->GetNext(&pNew);
+		if (NS_FAILED(r)) // IS an error
+			break;
+		if (obIID) {
+			nsISupports *temp;
+			r = pNew->QueryInterface(iid, (void **)&temp);
+			pNew->Release();
+			if ( NS_FAILED(r) ) {
+				break;
+			}
+			pNew = temp;
+		}
+		fetched[n_fetched] = pNew;
+		n_fetched++;
+	}
+	Py_END_ALLOW_THREADS;
+	PyObject *ret;
+	if (NS_SUCCEEDED(r)) {
+		ret = PyList_New(n_fetched);
+		if (ret)
+			for (int i=0;i<n_fetched;i++) {
+				PyObject *new_ob = Py_nsISupports::PyObjectFromInterface(fetched[i], iid, PR_FALSE);
+				PyList_SET_ITEM(ret, i, new_ob);
+			}
+	} else
+		ret = PyXPCOM_BuildPyException(r);
+
+	if ( ret == NULL ) {
+		// Free the objects we consumed.
+		for (int i=0;i<n_fetched;i++)
+			fetched[i]->Release();
+
+	}
+	delete [] fetched;
+	return ret;
+}
+
+
+struct PyMethodDef 
+PyMethods_ISimpleEnumerator[] =
+{
+	{ "HasMoreElements", PyHasMoreElements, 1},
+	{ "hasMoreElements", PyHasMoreElements, 1},
+	{ "GetNext", PyGetNext, 1},
+	{ "getNext", PyGetNext, 1},
+	{ "FetchBlock", PyFetchBlock, 1},
+	{ "fetchBlock", PyFetchBlock, 1},
+	{NULL}
+};